Name: Henan Jinyida Machinery Equipment Manufacturing Co., Ltd.
Address: 巩义市南地工业区一号, Zhengzhou, Henan, CN
Telephone: +8615238028609

Chemical raw materials 36 items

Chemical raw materials —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
Calcium carbonate	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	High bulk density and high single-unit output; drum size set by throughput. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for calcium carbonate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Barium sulfate	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	High bulk density and free-flowing; suited to continuous feed and discharge. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for barium sulfate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Aluminium hydroxide	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Prone to caking; flash drying shortens the time spent in the wet zone. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for aluminium hydroxide, because two materials of the same form can differ by a whole machine size.
Precipitated silica	Powder	Not heat-sensitive	Flash Airflow Dryer		Precipitated silica is a typical light powder and three quarters of the selection is aerodynamics. Its bulk density is low, so a given weight occupies a volume more like flour, and pneumatic conveying is sensitive to both velocity and duct size: too slow and it will not move, too fast and the bed disperses and the dust collection load rises with it. So the first question at selection is whether the air volume range of the system can carry this powder steadily. The second characteristic is that it lifts very easily, so closed conveying and a high extraction grade are needed, or after a few months the workshop is covered in white powder and the maintenance load on the casing, the bearings and the instruments climbs visibly. Our configuration is a flash airflow line: the material is carried the whole way inside a closed duct and never drops to the floor, so the dust problem is solved structurally rather than operationally. The rotary drum is the alternative for larger throughput where the air volume cannot carry the powder stably, with the flights replacing pneumatic conveying. Silica does not absorb moisture, does not cake and is not particularly heat sensitive, which means its selection rests almost entirely on the conveying end. Detail →
Sodium carbonate	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Strongly hygroscopic; guard against moisture regain after discharge. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for sodium carbonate, because two materials of the same form can differ by a whole machine size.
Caustic soda flakes	Flake	Not heat-sensitive	Rotary Dryer		Flakes break up in tumbling; drum speed and flight pattern need control. Flakes are not afraid of heat, they are afraid of being crushed and folded; every contact between equipment and material can leave a reject. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Too much tumbling breaks flakes, so the flights have to support them and the speed should not be high. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. If the incoming grade of caustic soda flakes is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Sodium sulfide	Flake	Moderate	Rotary Dryer	Electric Heating Dryer	Picks up moisture and cakes; seal after drying. Flakes bridge easily, so the feed section needs a disintegrator or forced feeding; once the material balls up and blocks the inlet, the best hot air in the building is wasted. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Flakes stick together into lumps, so both the feed section and the flight pattern have to be matched to how strong the flakes are. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for sodium sulfide, because two materials of the same form can differ by a whole machine size.
Ammonium sulfate	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Contains water of crystallisation, decomposes if overheated; keep a margin on inlet temperature. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for ammonium sulfate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Calcium chloride	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Extremely hygroscopic; moisture protection needed at the discharge end. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for calcium chloride by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Polyaluminium chloride PAC	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Fairly sticky; flight pattern and drum speed to be set by trial run. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for polyaluminium chloride by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Diatomite	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Porous and light; suited to flash drying. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for diatomite, because two materials of the same form can differ by a whole machine size.
Activated carbon	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Very dusty powder; dust collection and dust-free discharge are both required. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of activated carbon is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Zinc oxide	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Relatively high bulk density; drum tumbling suits it well. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of zinc oxide is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Magnesium hydroxide	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Usually fed as filter cake; an integrated disintegrator is preferable. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for magnesium hydroxide by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Melamine	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Light powder; pneumatic conveying is efficient. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for melamine, because two materials of the same form can differ by a whole machine size.
Antimony trioxide	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Fine powder dusts readily; a closed airflow route is cleaner. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for antimony trioxide by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Boric acid	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Fine and light; suited to pneumatic conveying. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for boric acid by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Synthetic cryolite	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Fine powder; pneumatic conveying required. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. If the incoming grade of synthetic cryolite is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Barium carbonate	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Fairly high bulk density; the drum route is more stable. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of barium carbonate is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Manganese dioxide	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Fairly high bulk density and above-average abrasiveness; wear liners required. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual manganese dioxide decide the machine size far more than the name does.
Manganese sulfate	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Crystalline salt with water of crystallisation; control temperature to avoid over-dehydration. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for manganese sulfate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Potassium nitrate	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Oxidising salt; keep organic matter out and avoid local overheating. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for potassium nitrate, because two materials of the same form can differ by a whole machine size.
Ammonium nitrate	Granular	Moderate	Rotary Dryer	Electric Heating Dryer	Risk of thermal decomposition; keep a margin on the temperature limit. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for ammonium nitrate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Ammonium chloride	Granular	Moderate	Rotary Dryer	Flash Airflow Dryer	Corrosive once moist; 304 stainless for contact parts, and pack soon after drying. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of ammonium chloride is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Oxalic acid	Granular	Moderate	Rotary Dryer	Electric Heating Dryer	Corrosive; 316L stainless recommended for product-contact parts. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Send a sample with the enquiry. The moisture and bulk density of the actual oxalic acid decide the machine size far more than the name does.
Monopotassium phosphate MKP	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Crystalline granules with a modest moisture content. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for monopotassium phosphate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Aluminium sulfate	Granular	Not heat-sensitive	Rotary Dryer		Acidic salt; 316L stainless recommended for product-contact parts. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. If the incoming grade of aluminium sulfate is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Benzoic acid	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive; only seconds of exposure keeps the material within its temperature limit. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for benzoic acid by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Sodium oxalate	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Fine powder; the pneumatic conveying route is preferable. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual sodium oxalate decide the machine size far more than the name does.
Cellulose acetate	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Thermoplastic powder; control temperature to avoid softening. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for cellulose acetate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Stearic acid	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Low melting point; short exposure prevents melting and sticking. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for stearic acid by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Concrete superplasticiser	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Powder picks up moisture readily; seal after drying. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual concrete superplasticiser decide the machine size far more than the name does.
Detergent powder	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Contains surfactant; control temperature to avoid decomposition. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for detergent powder, because two materials of the same form can differ by a whole machine size.
Sodium humate	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Organic powder; temperature control. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for sodium humate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Rubber accelerator CBS	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Organic additive; control temperature to avoid decomposition. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual rubber accelerator CBS decide the machine size far more than the name does.
Azodicarbonamide	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive; short exposure keeps it clear of the decomposition range. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Send a sample with the enquiry. The moisture and bulk density of the actual azodicarbonamide decide the machine size far more than the name does.

Fine chemicals & pigments 21 items

Fine chemicals & pigments —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
Titanium dioxide	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Fine particles; pneumatic conveying reduces agglomeration and caking. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for titanium dioxide, because two materials of the same form can differ by a whole machine size.
Iron oxide pigment	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	The pigment shade is sensitive; keep the discharge temperature modest. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual iron oxide pigment decide the machine size far more than the name does.
Organic pigment	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive; a material temperature limit must be set. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of organic pigment is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Dye intermediate	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Heat-sensitive with many grades; short exposure is the key. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. Send a sample with the enquiry. The moisture and bulk density of the actual dye intermediate decide the machine size far more than the name does.
Carbon black	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Extremely light and dusty; sealed conveying and dust collection are essential. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual carbon black decide the machine size far more than the name does.
Optical brightener	Powder	Moderate	Flash Airflow Dryer	Electric Heating Dryer	Turns yellow at high temperature; keep a margin on the temperature limit. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of optical brightener is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Stearate	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Low melting point; only seconds of exposure keeps it within the temperature limit. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for stearate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Resin powder	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Low softening point; short exposure prevents softening and sticking. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. Send a sample with the enquiry. The moisture and bulk density of the actual resin powder decide the machine size far more than the name does.
Catalyst carrier	Granular	Moderate	Electric Heating Dryer	Rotary Dryer	Porous structure is heat-sensitive; close temperature control required. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. Electric heating has no flame and no flue gas, and it controls temperature quickly and cleanly, which suits sites without gas and duties with a cleanliness requirement. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. If the incoming grade of catalyst carrier is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Molecular sieve	Granular	Moderate	Electric Heating Dryer	Rotary Dryer	The degree of drying determines adsorption performance; hold the temperature steady. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. Electric heating has no flame and no flue gas, and it controls temperature quickly and cleanly, which suits sites without gas and duties with a cleanliness requirement. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for molecular sieve by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Anthraquinone	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Dye intermediate; keep the exposure to heat short. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for anthraquinone by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Phthalocyanine blue	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Organic pigment, fine and dusty. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for phthalocyanine blue, because two materials of the same form can differ by a whole machine size.
Phthalocyanine green	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Organic pigment, fine powder. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. If the incoming grade of phthalocyanine green is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Indigo	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Dyestuff powder; control temperature to protect the shade. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual indigo decide the machine size far more than the name does.
H-acid	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Dye intermediate; usually fed as wet filter cake. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. If the incoming grade of h-acid is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Disperse dye	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Dyestuff filter cake needs disintegration; control temperature to protect the shade. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for disperse dye by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Reactive dye	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Dyestuff filter cake needs disintegration; control temperature to protect the shade. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual reactive dye decide the machine size far more than the name does.
Lead chromate	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Inorganic pigment; protect against heavy-metal dust. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for lead chromate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Zinc sulfide	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Pigment-grade fine powder. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for zinc sulfide by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Iron oxide black	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Pigment fine powder, dusty. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual iron oxide black decide the machine size far more than the name does.
Lithopone	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Pigment-grade fine powder, medium bulk density. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for lithopone by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.

Pharmaceuticals & herbal medicine 16 items

Pharmaceuticals & herbal medicine —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
API powder	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Heat-sensitive with high cleanliness requirements; stainless steel for product-contact parts. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for API powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Pharma intermediate	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Exposure to heat should be as short as possible. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Send a sample with the enquiry. The moisture and bulk density of the actual pharma intermediate decide the machine size far more than the name does.
Herbal extract powder	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	High sugar content and sticky; flash drying avoids wall build-up. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. If the incoming grade of herbal extract powder is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Herbal slices	Flake	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive constituents; short exposure limits losses. Flakes bridge easily, so the feed section needs a disintegrator or forced feeding; once the material balls up and blocks the inlet, the best hot air in the building is wasted. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Flakes that dry too fast curl up, so temperature and air volume have to be set apart: hold the temperature first, then raise the air volume slowly. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for herbal slices by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Crude herb	Lump	Heat-sensitive	Batch Rotary Dryer		Small batches and many grades; needs flexible changeover. Lumps knock against each other inside the drum, so speed and flight pattern have to be matched to the material strength, otherwise you end up with material that is dry and broken at the same time. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. A batch dryer handles one batch at a time, so throughput is limited by batch charge and cycle time, but every batch can be temperature controlled and recorded on its own. A dry shell with a wet core is normal for lumps, so discharge has to spread the material out to cool instead of piling it into a hot heap. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Send a sample with the enquiry. The moisture and bulk density of the actual crude herb decide the machine size far more than the name does.
Herb residue	Granular	Not heat-sensitive	Rotary Dryer	Batch Rotary Dryer	High moisture; mechanical dewatering before thermal drying is more economical. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. If the incoming grade of herb residue is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Vitamin premix	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	The active ingredient is heat-sensitive; exposure should be as short as possible. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. Do not describe the material only as powder or granules: give the measured moisture and bulk density for vitamin premix, because two materials of the same form can differ by a whole machine size.
Yeast powder	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Activity must be preserved; fast low-temperature drying. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for yeast powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Enzyme preparation	Powder	Heat-sensitive	Flash Airflow Dryer		Demanding temperature control; low material temperature limit. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for enzyme preparation, because two materials of the same form can differ by a whole machine size.
Glucose	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Picks up moisture and cakes; pack promptly after drying. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. If the incoming grade of glucose is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Antibiotic mycelium	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive; exposure in seconds avoids loss of activity. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for antibiotic mycelium, because two materials of the same form can differ by a whole machine size.
Salicylic acid	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive; tighten the temperature limit. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of salicylic acid is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Scutellaria extract	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	The active ingredient is heat-sensitive; short exposure limits losses. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for scutellaria extract by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Chlorogenic acid extract	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	The active ingredient is heat-sensitive; short exposure. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for chlorogenic acid extract by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
2-Keto-L-gulonic acid	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Vitamin C precursor, heat-sensitive; temperature control. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for 2-Keto-L-gulonic acid, because two materials of the same form can differ by a whole machine size.
4-Aminobenzoic acid PABA	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Pharmaceutical intermediate, heat-sensitive. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of 4-Aminobenzoic acid is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.

Pesticides & fertilisers 16 items

Pesticides & fertilisers —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
Wettable powder	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive and fine; flash drying is preferable. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for wettable powder, because two materials of the same form can differ by a whole machine size.
Pesticide granule	Granular	Moderate	Rotary Dryer	Flash Airflow Dryer	Low granule strength; tumbling must be gentle. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for pesticide granule, because two materials of the same form can differ by a whole machine size.
Glyphosate	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Decomposes on heating; control the material temperature. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for glyphosate, because two materials of the same form can differ by a whole machine size.
Urea	Granular	Moderate	Rotary Dryer	Flash Airflow Dryer	Decomposes if overheated; keep a margin on the inlet temperature. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for urea, because two materials of the same form can differ by a whole machine size.
Compound fertiliser	Granular	Not heat-sensitive	Rotary Dryer		High output with continuous operation; drum size is set by throughput. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Send a sample with the enquiry. The moisture and bulk density of the actual compound fertiliser decide the machine size far more than the name does.
Organic fertiliser	Granular	Not heat-sensitive	Rotary Dryer	Batch Rotary Dryer	High moisture; flight and lifting pattern need optimisation. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for organic fertiliser by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Chicken manure	Granular	Not heat-sensitive	Rotary Dryer		Drying chicken manure is a textbook two-stage process: dewater first, then apply heat. Fresh manure often arrives above 70 percent moisture, and putting it straight into a hot dryer means paying for that water with fuel while the water is bound rather than free, which hot air cannot simply carry away. The right route is mechanical dewatering down to around 40 percent and then heat drying in a rotary drum, and the capital for that first stage has to be counted into the whole line — costing only the heat stage gives a misleading answer. The rotary route shows its advantage clearly here: manure is sticky and fibrous, and the flights lift and drop it continuously, so fresh feed mixes with older material and the outlet moisture is consistent. Biomass is the natural heat source, since the manure is itself a fuel, but the tail end needs a non-return device so vapour cannot flow back into the combustion chamber. The ammonia content is high, so the exhaust has to meet the standard; near sensitive neighbours there is a complaint risk. If the product is to be sold as organic fertilizer, heavy metals and contaminants need to be controlled as well. Detail →
Potassium sulfate	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Cakes easily when hot; cooling at the discharge end gives steadier results. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for potassium sulfate, because two materials of the same form can differ by a whole machine size.
Monoammonium phosphate MAP	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Contains water of crystallisation; control the drying temperature. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for monoammonium phosphate, because two materials of the same form can differ by a whole machine size.
Microbial fertiliser	Granular	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Low-temperature drying needed to preserve viable counts. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Granules dry on the surface long before the inside is done, so final moisture has to mean moisture throughout, not just a dry shell. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Send a sample with the enquiry. The moisture and bulk density of the actual microbial fertiliser decide the machine size far more than the name does.
Atrazine	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Technical-grade herbicide; filter cake feed needs disintegration. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for atrazine, because two materials of the same form can differ by a whole machine size.
Folpet	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Technical-grade fungicide; control temperature to avoid decomposition. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual folpet decide the machine size far more than the name does.
Calcium magnesium phosphate	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Fertiliser powder, high throughput. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for calcium magnesium phosphate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Single superphosphate	Granular	Not heat-sensitive	Rotary Dryer		Contains free acid; 316L stainless recommended for product-contact parts. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Send a sample with the enquiry. The moisture and bulk density of the actual single superphosphate decide the machine size far more than the name does.
Triple superphosphate	Granular	Not heat-sensitive	Rotary Dryer		Contains free acid; 316L stainless recommended for product-contact parts. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Send a sample with the enquiry. The moisture and bulk density of the actual triple superphosphate decide the machine size far more than the name does.
Sodium tripolyphosphate STPP	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Additive powder, low bulk density. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for sodium tripolyphosphate, because two materials of the same form can differ by a whole machine size.

Inorganic salts 18 items

Inorganic salts —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
Magnesium sulfate	Granular	Moderate	Flash Airflow Dryer	Rotary Dryer	Magnesium sulphate is a typical hygroscopic inorganic salt, and the difficulty sits at the material end rather than the heat end. It absorbs moisture quickly and takes it back just as quickly; the mother liquor carries seven waters of crystallisation, and dehydration has to happen in one step, because stopping halfway is what makes it cake. Our standard configuration is a flash airflow line: the material reaches the target moisture within seconds, the residence time is too short for any window to re-absorb moisture, and the discharge end goes straight into sealed packaging, which is the single most important step in the process. The rotary drum is the alternative, used when throughput is larger or when a longer residence time is needed to convert the heptahydrate fully to the anhydrous form. Natural gas or direct-fired biomass both work, but biomass needs flame isolation and spark capture: magnesium sulphate itself is not combustible, whereas ash carried into the product is the real problem. Final moisture is usually set below 0.5 percent, and that figure has to be confirmed by trial run, because variation in the incoming moisture of a batch shows up directly in the finished product. Detail →
Zinc sulfate	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Contains water of crystallisation; control temperature to avoid over-dehydration. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual zinc sulfate decide the machine size far more than the name does.
Copper sulfate	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Fairly corrosive; select the right material for product-contact parts. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for copper sulfate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Lithium carbonate	Powder	Moderate	Rotary Dryer	Electric Heating Dryer	Battery grade lithium carbonate is sensitive on three fronts at once: moisture, impurities and particle size, which makes it one of the most demanding materials on the line. If moisture is not held, the battery plant receives a rejected batch; if impurities are over, the precursor synthesis is affected; and if the particle size spreads, blending downstream is uneven. Our approach is a rotary drum rather than a flash unit, because lithium carbonate has a high bulk density and has to be taken below 0.3 percent moisture: the seconds-long heating of a flash dryer carries the fines around inside the duct and they cannot be graded out, whereas the flights in a drum keep the material tumbling with far more relative motion, so the residual moisture can be drawn out over a longer residence time at the tail end. The heat source is electric or electromagnetic, with no open flame, which removes the risk of a flame in a hydrogen atmosphere and keeps the drum wall below 150°C so the carbonate does not decompose. The moisture basis has to be written into the contract: dry basis and wet basis differ by thirty percent, so the quotation and the acceptance test are not the same number. Detail →
Lithium hydroxide	Powder	Moderate	Electric Heating Dryer	Rotary Dryer	Both hygroscopic and corrosive; temperature and humidity control both matter. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. Electric heating removes the heat source problem, but the energy cost per tonne of water has to be worked out; it suits small batches and heat sensitive material. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual lithium hydroxide decide the machine size far more than the name does.
Sodium nitrate	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Oxidising material; avoid local overheating. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of sodium nitrate is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Magnesium chloride	Flake	Not heat-sensitive	Rotary Dryer		Extremely hygroscopic; pack immediately after discharge. Flakes bridge easily, so the feed section needs a disintegrator or forced feeding; once the material balls up and blocks the inlet, the best hot air in the building is wasted. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Too much tumbling breaks flakes, so the flights have to support them and the speed should not be high. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for magnesium chloride, because two materials of the same form can differ by a whole machine size.
Borax	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Contains water of crystallisation; excessive heat causes melting and caking. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual borax decide the machine size far more than the name does.
Sodium fluoride	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Dust from the powder must be controlled; dust collection required. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of sodium fluoride is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Ferrous sulfate	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Prone to oxidation; control both drying and discharge temperature. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for ferrous sulfate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Sodium sulfate	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Fine inorganic salt; drum drying is stable in continuous operation. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for sodium sulfate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Industrial sodium chloride	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Contains chloride ions; 316L stainless recommended for product-contact parts. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for industrial sodium chloride by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Nickel sulfate	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Salt solution is corrosive; 316L stainless recommended for product-contact parts. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for nickel sulfate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Cobalt sulfate	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Salt solution is corrosive; 316L stainless recommended for product-contact parts. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual cobalt sulfate decide the machine size far more than the name does.
Potassium chloride	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Crystalline salt, moderately hygroscopic. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual potassium chloride decide the machine size far more than the name does.
Sodium sulfite	Granular	Moderate	Rotary Dryer	Flash Airflow Dryer	Prone to oxidation; control temperature and shorten exposure. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual sodium sulfite decide the machine size far more than the name does.
Sodium hexametaphosphate	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Powder picks up moisture readily; seal after drying. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual sodium hexametaphosphate decide the machine size far more than the name does.
Calcium nitrate	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Highly hygroscopic; pack immediately after drying. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of calcium nitrate is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.

New energy & battery materials 17 items

New energy & battery materials —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
Battery-grade lithium carbonate	Powder	Moderate	Electric Heating Dryer	Rotary Dryer	Tight limits on moisture and metallic contamination; close temperature control required. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. Having no flame matters for combustible dust and flammable materials, but the running electricity cost is a long term number and belongs in the same calculation. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual battery-grade lithium carbonate decide the machine size far more than the name does.
Lithium iron phosphate LFP	Powder	Moderate	Electric Heating Dryer	Flash Airflow Dryer	Fine and dusty; prevent cross-contamination. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. Electric heating removes the heat source problem, but the energy cost per tonne of water has to be worked out; it suits small batches and heat sensitive material. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual lithium iron phosphate decide the machine size far more than the name does.
NCM precursor	Powder	Moderate	Electric Heating Dryer	Rotary Dryer	Sensitive to temperature and atmosphere; the temperature must be held steady. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. Electric heating has no flame and no flue gas, and it controls temperature quickly and cleanly, which suits sites without gas and duties with a cleanliness requirement. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for NCM precursor by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Graphite anode material	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Light and dusty; sealing and dust collection are essential. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual graphite anode material decide the machine size far more than the name does.
Petroleum coke	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	High output with continuous operation; drum size is set by throughput. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of petroleum coke is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Battery-grade lithium hydroxide	Powder	Moderate	Electric Heating Dryer	Rotary Dryer	Strongly hygroscopic; prevent moisture regain at the discharge end. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. Electric heating removes the heat source problem, but the energy cost per tonne of water has to be worked out; it suits small batches and heat sensitive material. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for battery-grade lithium hydroxide, because two materials of the same form can differ by a whole machine size.
Conductive carbon black	Powder	Not heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Light powder; pneumatic conveying is more uniform. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for conductive carbon black by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Ceramic-coated alumina	Powder	Not heat-sensitive	Electric Heating Dryer	Flash Airflow Dryer	Narrow particle-size distribution required; avoid secondary agglomeration during drying. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. Electric heating has no flame and no flue gas, and it controls temperature quickly and cleanly, which suits sites without gas and duties with a cleanliness requirement. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for ceramic-coated alumina by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Battery black mass	Powder	Not heat-sensitive	Rotary Dryer	Electric Heating Dryer	Electrolyte residue; ventilation and explosion protection required. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Send a sample with the enquiry. The moisture and bulk density of the actual battery black mass decide the machine size far more than the name does.
Electrolyte additive	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive and hygroscopic; short exposure, then seal immediately. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Send a sample with the enquiry. The moisture and bulk density of the actual electrolyte additive decide the machine size far more than the name does.
Carbon nanotube CNT	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Nano-scale light powder; a closed airflow route prevents escape. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual carbon nanotube decide the machine size far more than the name does.
Boron nitride BN	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Thermally conductive filler, fine and light. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for boron nitride, because two materials of the same form can differ by a whole machine size.
PVDF resin	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Fluoropolymer, heat-sensitive; keep a margin on the temperature limit. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Send a sample with the enquiry. The moisture and bulk density of the actual PVDF resin decide the machine size far more than the name does.
Synthetic graphite	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Anode precursor, fine powder; the airflow route is more efficient. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for synthetic graphite by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Iron phosphate	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Cathode precursor; control temperature to prevent oxidation. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. If the incoming grade of iron phosphate is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Battery-grade manganese sulfate	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Battery material; avoid moisture pickup and metallic contamination. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for battery-grade manganese sulfate, because two materials of the same form can differ by a whole machine size.
Flake graphite	Flake	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Flaky structure; the drum route better preserves the flake shape. Flakes bridge easily, so the feed section needs a disintegrator or forced feeding; once the material balls up and blocks the inlet, the best hot air in the building is wasted. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Too much tumbling breaks flakes, so the flights have to support them and the speed should not be high. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of flake graphite is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.

Metallurgy & metal powders 14 items

Metallurgy & metal powders —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
Aluminium powder	Powder	Not heat-sensitive	Electric Heating Dryer	Rotary Dryer	Aluminium powder is the material here with the strictest safety requirement. It is combustible, its dust will deflagrate at a certain concentration when it meets a spark, and it burns with a high heat value, which makes extinguishing difficult. The whole line is therefore designed around two things: producing no sparks, and leaving no dead corners where powder can accumulate. Our standard configuration is an electrically heated rotary drum: no flame, no flue gas, controllable temperature, and the drum wall held below 150°C so the material cannot ignite locally. Dust collection is the other key point: aluminium powder is extremely fine and light, a plain cyclone will not capture it, so a high efficiency bag filter with explosion venting is needed, the ducting has to be statically bonded and earthed, the fan needs an explosion proof motor, and every component that could produce a spark has to be designed out. We have also run a case converting an electrically heated installation to electromagnetic heating, because electromagnetic heating has no combustion system at all and removes even the remaining possibility of a spark while giving finer temperature control. The drum also needs regular cleaning, because a layer of aluminium powder building up on the wall is itself a hazard. Detail →
Copper powder	Powder	Not heat-sensitive	Electric Heating Dryer	Rotary Dryer	Prone to oxidation; control both drying and discharge temperature. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. Electric heating has no flame and no flue gas, and it controls temperature quickly and cleanly, which suits sites without gas and duties with a cleanliness requirement. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for copper powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Iron powder	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Prone to oxidation; move to the next process step promptly after drying. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of iron powder is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Zinc powder	Powder	Not heat-sensitive	Electric Heating Dryer		Combustible powder; must be built to explosion-protection requirements. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. Electric heating removes the heat source problem, but the energy cost per tonne of water has to be worked out; it suits small batches and heat sensitive material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Send a sample with the enquiry. The moisture and bulk density of the actual zinc powder decide the machine size far more than the name does.
Iron oxide powder	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	High bulk density, well suited to continuous feed and discharge. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of iron oxide powder is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Silicon metal powder	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Very dusty powder; the dust collection system must be sized to match. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for silicon metal powder, because two materials of the same form can differ by a whole machine size.
Molybdenum powder	Powder	Not heat-sensitive	Electric Heating Dryer	Batch Rotary Dryer	High-value material; demanding temperature and contamination control. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Having no flame matters for combustible dust and flammable materials, but the running electricity cost is a long term number and belongs in the same calculation. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. If the incoming grade of molybdenum powder is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Silicon carbide powder	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Hard and abrasive; wear protection needed on contact parts. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for silicon carbide powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Mineral concentrate	Powder	Not heat-sensitive	Rotary Dryer		High output with uneven moisture; flight pattern to be set by trial run. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. When ordering, ask for mineral concentrate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Copper concentrate	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Highly abrasive mineral powder; the drum needs wear liners. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for copper concentrate by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Nickel concentrate	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Highly abrasive mineral powder; wear liners required. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for nickel concentrate, because two materials of the same form can differ by a whole machine size.
Zinc concentrate	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Highly abrasive mineral powder; wear liners required. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual zinc concentrate decide the machine size far more than the name does.
Pulverised coal	Powder	Not heat-sensitive	Rotary Dryer		Combustible dust; explosion protection and electrostatic earthing are mandatory. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. When ordering, ask for pulverised coal by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Smelter-grade alumina	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Light fine powder; pneumatic conveying is efficient. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for smelter-grade alumina by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.

Building materials & minerals 20 items

Building materials & minerals —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
Quartz sand	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Quartz sand is one of the most forgiving materials there is: sharp grained, hard, non hygroscopic and chemically stable, so there is a lot of freedom in the choice of machine. Large lines use a rotary drum, while small batches can run on flash or even batch equipment. Only three variables really matter: particle size distribution, moisture and energy cost per tonne of water. The size distribution decides two things. First abrasiveness: sand wears the flights and the drum wall far more than powder does, so the plate thickness has to follow the abrasion rating and wear liners may be needed. Second classification: coarse and fine sand travel differently through the same machine, so if the output has to be graded, screening has to be added at the tail end, otherwise the fines come out first and the grades get mixed up. On moisture, quartz sand does not absorb water, but sand that has been stockpiled picks up clay and organics, so a pre-dewatering step before the heat is more economical than going straight to hot air. Sand has a high bulk density, so drum fill can be set higher than for powder and the throughput ceiling rises with it. Detail →
River sand	Granular	Not heat-sensitive	Rotary Dryer		High throughput; drum size set by capacity. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. If the incoming grade of river sand is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Manufactured sand	Granular	Not heat-sensitive	Rotary Dryer		With high mud content, washing before drying gives steadier results. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for manufactured sand, because two materials of the same form can differ by a whole machine size.
Limestone powder	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	High bulk density, well suited to continuous feed and discharge. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for limestone powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Kaolin	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	There is only one keyword in selecting kaolin: stickiness. It comes from the extremely fine particle size, and it shows up in two states. Wet, the material balls up and the feed bridges, so it cannot get in. Dry, it builds a hard crust on the drum wall, and the thicker the crust grows the less material the flights can lift, so throughput drifts down steadily and it is not easy to notice. Three questions therefore decide a kaolin machine: the flight pattern, the available speed range, and whether there is pre-treatment to break up the lumps. Our standard configuration is the rotary drum, because the working volume is large enough to spread sticky material out at a reasonable fill ratio, and because the continuous lifting and dropping of the flights keeps the bed from sitting against the wall long enough to crust over. The flash dryer is the alternative for the second half of the process, once the moisture has come down far enough and the stickiness has been released. White clay and red clay, being kaolin derivatives, are stickier than pure kaolin, so the flights have to be specified on the more conservative side. Detail →
Bentonite	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Becomes very sticky once wet; disintegration and flights are critical. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for bentonite, because two materials of the same form can differ by a whole machine size.
Clay	Lump	Not heat-sensitive	Rotary Dryer		Lumpy feed dries more evenly after crushing. Lump material dries from the outside in, and the moisture inside has to travel outward by conduction, so this material essentially only works on the drum route with tumbling as the heat transfer mechanism. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Incoming moisture varies from batch to batch, so the line has to be able to follow the material and adjust the feed rate. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. When ordering, ask for clay by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Gypsum	Powder	Moderate	Rotary Dryer	Electric Heating Dryer	Excessive heat drives off water of crystallisation; the inlet temperature must be controlled. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of gypsum is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Fluorite powder	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	High bulk density and high output. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual fluorite powder decide the machine size far more than the name does.
Barite powder	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	High bulk density; the drum drive load must be matched. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for barite powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Cement raw meal	Powder	Not heat-sensitive	Rotary Dryer		High-output continuous operation; dust collection required. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Send a sample with the enquiry. The moisture and bulk density of the actual cement raw meal decide the machine size far more than the name does.
Glass sand	Granular	Not heat-sensitive	Rotary Dryer		Demanding requirements on discharge temperature and contamination control. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Send a sample with the enquiry. The moisture and bulk density of the actual glass sand decide the machine size far more than the name does.
Ceramic body	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Ceramic powder; needs pneumatic conveying and disintegration. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for ceramic body by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Wollastonite powder	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Needle-like mineral; the drum route does less damage to the shape. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for wollastonite powder, because two materials of the same form can differ by a whole machine size.
Dolomite powder	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Mineral powder, high throughput. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of dolomite powder is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Feldspar powder	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Mineral powder, high throughput. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for feldspar powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Ground granulated blast-furnace slag	Powder	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Slag is dried before grinding; high throughput. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for ground granulated blast-furnace slag by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Silica fume	Powder	Not heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Ultrafine powder, very light, dusty. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Dust settling in the ducts and in the dust collector changes the resistance, the air volume drops with it, and the cleaning cycle has to be part of the process. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. When ordering, ask for silica fume by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Mica flake	Flake	Not heat-sensitive	Rotary Dryer		Flaky mineral; drum tumbling does little damage to the flake shape. Flakes are not afraid of heat, they are afraid of being crushed and folded; every contact between equipment and material can leave a reject. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Too much tumbling breaks flakes, so the flights have to support them and the speed should not be high. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. If the incoming grade of mica flake is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Vermiculite	Flake	Not heat-sensitive	Rotary Dryer		Light flaky mineral; dust control matters. Flakes are not afraid of heat, they are afraid of being crushed and folded; every contact between equipment and material can leave a reject. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Too much tumbling breaks flakes, so the flights have to support them and the speed should not be high. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for vermiculite, because two materials of the same form can differ by a whole machine size.

Feed & livestock 34 items

Feed & livestock —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
Feed pellets	Granular	Moderate	Flash Airflow Dryer	Rotary Dryer	What really has to be solved in feed drying is the dry shell around a wet core. Once the pellets come out, the surface is already dry while the moisture inside is still there, and they start to go mouldy within days of stacking, which costs more than the energy spent drying them. Our approach is a flash airflow line with a longer equalising section behind it: the pellets are carried quickly by the hot air and the surface sets first, then they spend longer in the equalising section so the internal moisture migrates outward, and it is the two stages together that level the moisture through the pellet. Temperature has to be held: the heat limit of feed is on the material temperature, not the hot air, and protein starts to denature around 60°C, so extend the residence time rather than raise the inlet temperature. The other point that is easy to miss is dust: feed meal is combustible dust, the dust collector has to be selected for combustible dust, and grounding, bonding and explosion venting cannot be skipped. Animal protein lines and ruminant feed lines need to be scheduled separately, with a full clean-down between products. Detail →
Blood meal	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Blood meal is the most heat sensitive material in this library. The protein starts to denature around 60°C and lysine availability drops with it, and that process cannot be reversed: drying a little more slowly can still be recovered, overshooting the temperature cannot. Blood meal therefore only works on a flash airflow line, where the water is taken out in seconds and the material leaves the drying zone before its own temperature reaches the critical point. The process we use works backwards from the material temperature rather than from the hot air: the air can run at 180°C, and as long as the residence time is short enough the material temperature stays near 60°C. The second difficulty is disintegration. Blood meal carries a lot of water and is very sticky, so the inlet bridges easily, and once it bridges no amount of air gets through: the discharge then swings between too much and too little, too dry and too wet. The lumps have to be broken in the feed section. Dust explosion protection and segregated scheduling are the same as for feed. Detail →
Meat and bone meal	Granular	Moderate	Rotary Dryer	Batch Rotary Dryer	High moisture and strong odour; off-gas treatment required. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. Do not describe the material only as powder or granules: give the measured moisture and bulk density for meat and bone meal, because two materials of the same form can differ by a whole machine size.
Fish meal	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Fish meal and blood meal are two versions of the same problem: both are animal protein, both are heat sensitive, and both carry a lot of water and stickiness. Fish meal differs in its oil content, which brings two extra difficulties. First, a film of oil forms on the surface during drying and blocks vapour from moving out of the particle, so hot air alone struggles to get through. Second, that oil is combustible and the dust concentration is high, so the dust collection system has to be specified at the strictest explosion protection level. Our standard configuration is therefore a flash airflow line, with the residence time compressed to seconds so the vapour leaves before the oil seals the surface. Temperature is again controlled by the material temperature: protein denaturation is more damaging than oil oxidation, so protecting quality comes first. Where throughput is very large, or the oil content is high enough to need a longer residence time, a rotary drum becomes an option, but then oil building up on the drum wall has to be solved as well. Detail →
Feather meal	Powder	Moderate	Batch Rotary Dryer	Rotary Dryer	High moisture after hydrolysis; dewater before drying. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. A batch dryer handles one batch at a time, so throughput is limited by batch charge and cycle time, but every batch can be temperature controlled and recorded on its own. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for feather meal, because two materials of the same form can differ by a whole machine size.
Soybean dregs	Paste	Heat-sensitive	Rotary Dryer	Batch Rotary Dryer	Very high initial moisture; mechanical dewatering before thermal drying. Paste cannot be carried by hot air at all; the route is to dewater it mechanically to a moisture level it can be conveyed at, and only then apply heat. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. If the front end dewatering equipment is not matched, the economics of the whole line are gone; the capital in mechanical dewatering has to be counted together with the heat drying behind it. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. Do not describe the material only as powder or granules: give the measured moisture and bulk density for soybean dregs, because two materials of the same form can differ by a whole machine size.
Distillers grains	Granular	Moderate	Rotary Dryer	Batch Rotary Dryer	Sticky and wet; preventing wall build-up is the key selection point. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. Do not describe the material only as powder or granules: give the measured moisture and bulk density for distillers grains, because two materials of the same form can differ by a whole machine size.
Corn gluten meal	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Protein is temperature-sensitive; cap the material temperature. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual corn gluten meal decide the machine size far more than the name does.
Feed premix	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Trace components are heat-sensitive; close temperature control required. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for feed premix by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Forage grass	Fibrous	Heat-sensitive	Batch Rotary Dryer	Rotary Dryer	Bulky fibrous material; needs a longer, low-temperature dry. Fibrous material can be dried hard, but too much air velocity pulls the fine fibres out with the gas, so the dust collection load has to be calculated in advance. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. A batch dryer handles one batch at a time, so throughput is limited by batch charge and cycle time, but every batch can be temperature controlled and recorded on its own. Fibre that overheats turns brittle and scorches, so the air temperature needs real margin. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. If the incoming grade of forage grass is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Shrimp meal	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Protein and flavour are heat-sensitive; short exposure is safer. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for shrimp meal, because two materials of the same form can differ by a whole machine size.
Bone meal	Powder	Moderate	Batch Rotary Dryer	Rotary Dryer	Fat content spoils; degrease first or dry quickly. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. A batch dryer handles one batch at a time, so throughput is limited by batch charge and cycle time, but every batch can be temperature controlled and recorded on its own. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for bone meal, because two materials of the same form can differ by a whole machine size.
Eggshell powder	Granular	Not heat-sensitive	Rotary Dryer	Batch Rotary Dryer	Dewater first, then dry; add milling and screening after discharge. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for eggshell powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Silkworm pupa meal	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	High oil content, prone to oxidation; dry fast at low temperature. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for silkworm pupa meal by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Feed yeast	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Activity must be preserved; low-temperature flash drying. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Send a sample with the enquiry. The moisture and bulk density of the actual feed yeast decide the machine size far more than the name does.
Wheat bran	Flake	Moderate	Rotary Dryer	Flash Airflow Dryer	Light flakes; air volume and drum size must be matched. Flakes bridge easily, so the feed section needs a disintegrator or forced feeding; once the material balls up and blocks the inlet, the best hot air in the building is wasted. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Flakes stick together into lumps, so both the feed section and the flight pattern have to be matched to how strong the flakes are. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for wheat bran, because two materials of the same form can differ by a whole machine size.
Soybean meal	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Protein is temperature-sensitive; cap the material temperature. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for soybean meal, because two materials of the same form can differ by a whole machine size.
Peanut meal	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Oil content turns rancid; dry quickly at low temperature. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for peanut meal, because two materials of the same form can differ by a whole machine size.
Rapeseed meal	Powder	Moderate	Rotary Dryer	Flash Airflow Dryer	Control temperature to avoid excessive protein denaturation. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for rapeseed meal by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Cottonseed meal	Powder	Moderate	Rotary Dryer	Flash Airflow Dryer	As above; watch the material temperature limit. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of cottonseed meal is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Corn germ meal	Powder	Moderate	Rotary Dryer	Flash Airflow Dryer	High fat content; cool and pack promptly after drying. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual corn germ meal decide the machine size far more than the name does.
DDGS	Granular	Moderate	Rotary Dryer	Batch Rotary Dryer	Sticky and wet; preventing wall build-up is the key selection point. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. Send a sample with the enquiry. The moisture and bulk density of the actual DDGS decide the machine size far more than the name does.
Whey powder	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Heat-sensitive and hygroscopic; tighten the temperature limit. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. If the incoming grade of whey powder is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Aquatic feed pellets	Granular	Moderate	Flash Airflow Dryer	Rotary Dryer	Low granule strength; conveying and tumbling must be gentle. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for aquatic feed pellets, because two materials of the same form can differ by a whole machine size.
Swine feed pellets	Granular	Moderate	Flash Airflow Dryer	Rotary Dryer	Case-hardening with a wet core is common; extend effective contact time. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for swine feed pellets, because two materials of the same form can differ by a whole machine size.
Poultry feed pellets	Granular	Moderate	Flash Airflow Dryer	Rotary Dryer	As above; watch the particle breakage rate. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. If the incoming grade of poultry feed pellets is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Pet food pellets	Granular	Moderate	Flash Airflow Dryer	Rotary Dryer	The formulation contains oils; control temperature to prevent surface oiling. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual pet food pellets decide the machine size far more than the name does.
Calf milk replacer	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Heat-sensitive and hygroscopic; seal immediately after discharge. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. Send a sample with the enquiry. The moisture and bulk density of the actual calf milk replacer decide the machine size far more than the name does.
Starch residue	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	High moisture; mechanical dewatering before thermal drying. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. If the incoming grade of starch residue is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Fruit residue	Granular	Moderate	Rotary Dryer	Flash Airflow Dryer	High moisture; dewater first, control temperature to avoid scorching. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual fruit residue decide the machine size far more than the name does.
Soy sauce residue	Granular	Moderate	Rotary Dryer	Flash Airflow Dryer	Salt content; 304 or 316L stainless recommended for product-contact parts. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for soy sauce residue, because two materials of the same form can differ by a whole machine size.
Fishery by-product	Granular	Moderate	Rotary Dryer	Flash Airflow Dryer	High moisture; process promptly to avoid spoilage. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual fishery by-product decide the machine size far more than the name does.
Leaf meal	Flake	Moderate	Rotary Dryer	Flash Airflow Dryer	Bulky and light; feed rate needs control. Flakes are not afraid of heat, they are afraid of being crushed and folded; every contact between equipment and material can leave a reject. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Flakes stick together into lumps, so both the feed section and the flight pattern have to be matched to how strong the flakes are. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for leaf meal by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Fish scale	Flake	Moderate	Rotary Dryer		Flaky and perishable; must be processed promptly. Flakes are not afraid of heat, they are afraid of being crushed and folded; every contact between equipment and material can leave a reject. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Flakes stick together into lumps, so both the feed section and the flight pattern have to be matched to how strong the flakes are. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. If the incoming grade of fish scale is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.

Food & agricultural products 29 items

Food & agricultural products —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
Starch	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	There is one hard limit in starch drying: gelatinization. Once the moisture inside a starch granule reaches a certain fraction, the granule takes in water, swells and its structure breaks down, and after gelatinization it cannot be reversed — what comes out is a viscous paste rather than a powder. Starch is therefore rated at the highest heat sensitivity level and the process only works on a flash airflow line, where the water is taken out in the seconds before gelatinization can start. Our configuration works backwards from the material temperature: the hot air can run at 180 to 200°C and the residence time is only a few seconds, so as long as the moisture comes off fast enough the material temperature never reaches the gelatinization point. Starch also has a characteristic that matters here: gelatinization temperatures differ widely by species — cassava, corn and wheat starch are not the same — so the set temperature cannot simply be copied from another batch and has to follow the incoming test data. Storage matters just as much: starch takes on moisture very quickly, and once it cakes and turns sticky the drying has been wasted. Detail →
Corn starch	Powder	Heat-sensitive	Flash Airflow Dryer		This is the same category as starch, with the same gelatinization limit, but corn starch normally arrives at a lower moisture than cassava starch, so the feed section is steadier and the bridging risk is smaller. Our configuration is the same flash airflow line, with two differences: the residence time can be a little shorter, because the gelatinization temperature of corn starch is slightly higher than cassava and the process window is comparatively wider; and the air volume can be more generous, because corn starch has a relatively narrow size distribution and pneumatic classification works cleanly, so a cyclone at the tail end can recover the fines separately and give both a dry powder and a reusable fine fraction. Modified starch and pre-gelatinized starch are two different stories. Modified starch has been chemically treated and is more heat tolerant, so it can take a hotter process. Pre-gelatinized starch has already been gelatinized, so our approach is not to dry it at all but to spray dry it into granules — the route has to be confirmed with the supplier. Detail →
Wheat flour	Powder	Heat-sensitive	Flash Airflow Dryer		Excessive heat affects the gluten; hold the temperature steady. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Send a sample with the enquiry. The moisture and bulk density of the actual wheat flour decide the machine size far more than the name does.
Dehydrated vegetables	Flake	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Shade and rehydration are the priority; short exposure helps hold the colour. Flakes are not afraid of heat, they are afraid of being crushed and folded; every contact between equipment and material can leave a reject. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Flakes that dry too fast curl up, so temperature and air volume have to be set apart: hold the temperature first, then raise the air volume slowly. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for dehydrated vegetables, because two materials of the same form can differ by a whole machine size.
Tea leaves	Flake	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Flavour compounds are heat-sensitive; short exposure better retains the aroma. Thin flakes transfer heat quickly and can be dried hard, but the price is tighter demand on air velocity and on temperature uniformity. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Flakes that dry too fast curl up, so temperature and air volume have to be set apart: hold the temperature first, then raise the air volume slowly. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for tea leaves, because two materials of the same form can differ by a whole machine size.
Chilli powder	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Colour and pungency are heat-sensitive; shorten the exposure. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for chilli powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
White sugar	Granular	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Excessive heat causes caking or discolouration. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Granules dry on the surface long before the inside is done, so final moisture has to mean moisture throughout, not just a dry shell. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. Send a sample with the enquiry. The moisture and bulk density of the actual white sugar decide the machine size far more than the name does.
MSG	Granular	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Hygroscopic; pack immediately after discharge. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Granules dry on the surface long before the inside is done, so final moisture has to mean moisture throughout, not just a dry shell. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for MSG by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Rice bran	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Fat content turns rancid; dry quickly at low temperature. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for rice bran, because two materials of the same form can differ by a whole machine size.
Cassava flour	Powder	Heat-sensitive	Flash Airflow Dryer		Heat-sensitive, suited to flash drying. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for cassava flour, because two materials of the same form can differ by a whole machine size.
Spent mushroom substrate	Granular	Not heat-sensitive	Rotary Dryer	Batch Rotary Dryer	High moisture; dewater before thermal drying. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. If the incoming grade of spent mushroom substrate is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Potato starch	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive and prone to gelatinisation; flash drying is the safer route. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of potato starch is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Sweet potato starch	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	As for starch; cap the material temperature. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for sweet potato starch by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Wheat starch	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Control temperature to prevent gelatinisation and caking. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of wheat starch is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Pea starch	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive; shorten the exposure. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of pea starch is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Mung bean starch	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Batches tend to be small; batch operation gives more flexible temperature control. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for mung bean starch by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Modified starch	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Excessive heat damages the modified functionality; hold the temperature steady. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for modified starch, because two materials of the same form can differ by a whole machine size.
Pregelatinised starch	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Narrow process temperature window; close temperature control required. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for pregelatinised starch, because two materials of the same form can differ by a whole machine size.
Glutinous rice flour	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Sticky; preventing wall build-up and disintegration must be considered together. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for glutinous rice flour by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Canna starch	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive, suited to flash drying. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of canna starch is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Kudzu starch	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	High value in small batches; batch temperature control preserves quality. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for kudzu starch by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Soy protein	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Protein is heat-sensitive; exposure measured in seconds. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of soy protein is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Lactose	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Picks up moisture and cakes; pack promptly after drying. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual lactose decide the machine size far more than the name does.
Maltodextrin	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Hygroscopic; control temperature to avoid caking. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for maltodextrin, because two materials of the same form can differ by a whole machine size.
Egg yolk powder	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive; short exposure preserves flavour. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for egg yolk powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Instant coffee	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Flavour compounds are heat-sensitive; short exposure. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for instant coffee, because two materials of the same form can differ by a whole machine size.
Yeast extract	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive; control temperature to protect flavour. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for yeast extract, because two materials of the same form can differ by a whole machine size.
Caramel colour	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Pigment powder; temperature control. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for caramel colour, because two materials of the same form can differ by a whole machine size.
Gelatine sheet	Flake	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive flakes; residence measured in seconds better preserves gel strength. Flakes bridge easily, so the feed section needs a disintegrator or forced feeding; once the material balls up and blocks the inlet, the best hot air in the building is wasted. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Flakes that dry too fast curl up, so temperature and air volume have to be set apart: hold the temperature first, then raise the air volume slowly. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for gelatine sheet, because two materials of the same form can differ by a whole machine size.

Environmental & biomass 12 items

Environmental & biomass —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
Sawdust	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	The difficulty with sawdust is that the moisture is not uniform, not that it is high. Moisture in stacked wood chips is very uneven: the surface has already dried in the air to somewhere in the teens while the core is still in the twenties, and if the feed is sized on a single average the output is inevitably a dry shell around a wet core that goes mouldy within two days of stacking. Our approach is to put a screen at the feed end, separate coarse from fine and even out the size distribution, because with a wide spread the coarse material travels slowly and the fines travel fast, so the bed splits into two paths inside the drum and the moisture separates with them. The advantage of the rotary route shows up directly here: the flights lift and drop the material continuously, so large and small pieces keep mixing and the outlet moisture is far more consistent than with continuous feeding. Biomass pellets or coal are the most economical heat sources because the fuel is easy to get and the cost per tonne of water is low, but direct firing carries ash and sparks in the flue gas, and ash in the wood chips contaminates the product. The heat source side therefore needs flame isolation, spark capture and separate ash settling, with the ash kept out of the drum. Do not raise the speed early: once the fibres tangle, a higher speed only makes the mat worse. Detail →
Wood chips	Granular	Not heat-sensitive	Rotary Dryer		Wood chips are the same material as sawdust in a different form: at the front of the line they are flakes or chips, and at the back the job is to have them as a granular sawdust, so the drying requirement changes from drying the whole piece to drying the surface enough to be milled. That difference decides the machine: chips hold a lot of water and are barely permeable, so the surface has to be dry enough to be milled first, and after milling the material has to be dried again to take the water out properly. Our approach is to string the milling and the drying together, with the dryer feeding the mill directly, or the mill feeding the dryer, so the two steps buffer each other and a blockage in one does not stop the other. The rotary route has a second advantage here: the lift height the flights create stays within a controllable range, so the chips are not shattered and the fibre length is preserved, which gives a more uniform product after milling. Biomass is the main heat source here as well, and the ash must be settled separately and kept out of the drum. Detail →
Straw	Fibrous	Not heat-sensitive	Rotary Dryer	Batch Rotary Dryer	Bulky and flammable; fire precautions and temperature control must go together. Fibrous material tangles into mats inside the drum, which makes the flight pattern and the sectional arrangement more important than the speed. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Fibre tangles into mats inside the drum, so the flight sections and the drop points have to be set by trial run. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. If the incoming grade of straw is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Rice husk	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Low bulk density; throughput and air volume must be matched. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for rice husk by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Coconut coir	Fibrous	Moderate	Rotary Dryer	Batch Rotary Dryer	Fibrous and highly absorbent; needs a longer, low-temperature dry. Fibrous material is fluffy and bulky with an extremely low apparent density, so the same weight occupies many times the volume of powder; the equipment size is decided by volume rather than by weight. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Fibre shrinks noticeably as it dries, over drying curls the fibre and under drying stops it from pressing into a bale. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for coconut coir by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Sludge	Paste	Not heat-sensitive	Rotary Dryer	Batch Rotary Dryer	Sludge is the only material in this library where the pre-treatment has to be written into the selection rationale itself. Municipal and industrial sludge commonly arrives at around 80 percent moisture, and most of that water is bound; putting it straight into a hot dryer is both expensive and ineffective, because the water held by the silt and the organics has to be squeezed out mechanically first, by screw press, centrifuge or plate-and-frame filter. As a rule of thumb, bring the moisture down to around 50 percent before any heat is applied, and the choice at that point is the single most important economic decision in the whole process. Our configuration is the rotary drum: sludge needs continuous tumbling to break it up, and it cakes into hard lumps inside the drum quite readily, so the flight pattern has to be matched to the stickiness and a disintegrator may be needed at the feed end. Batch drying is the alternative for small throughput with variable feed. Two points have to be confirmed early. First, the exhaust carries ammonia and odour, and the condensing and deodorising sections are the part most often left out of the calculation. Second, sludge may contain heavy metals, so the end use and the discharge standard have to be settled against the customer's actual situation. Detail →
Biomass pellet	Granular	Not heat-sensitive	Rotary Dryer		Finished granules have limited strength; tumbling must be gentle. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for biomass pellet, because two materials of the same form can differ by a whole machine size.
Food waste residue	Paste	Not heat-sensitive	Rotary Dryer	Batch Rotary Dryer	High moisture and mixed composition; off-gas treatment required. Paste cannot be carried by hot air at all; the route is to dewater it mechanically to a moisture level it can be conveyed at, and only then apply heat. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Paste cakes quickly once the water is off, so spreading it while hot is far less work than handling it after cooling. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for food waste residue by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Electroplating sludge	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Mixed composition that may be acidic or alkaline; 316L stainless for contact parts; confirm hazardous-waste status and disposal requirements first. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Send a sample with the enquiry. The moisture and bulk density of the actual electroplating sludge decide the machine size far more than the name does.
Paper mill sludge	Granular	Not heat-sensitive	Rotary Dryer		High moisture; mechanical dewatering first. Particle size distribution decides two things: particles that are too big will not be carried, and particles that are too fine get pulled out of the drum by the air velocity, so screening and classification often have to be planned in advance. Good heat tolerance means it can be dried fast and hot or slow and cool, and the choice between the two is a trade between energy cost and capital investment. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for paper mill sludge, because two materials of the same form can differ by a whole machine size.
Furfural residue	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Acidic residue; 316L stainless recommended for product-contact parts. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. There is little restriction on temperature for this material; the real constraints are throughput and energy cost, so the process parameters can be opened up a little. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for furfural residue, because two materials of the same form can differ by a whole machine size.
Iron-manganese slag	Granular	Not heat-sensitive	Rotary Dryer	Flash Airflow Dryer	Fairly high bulk density, highly abrasive. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material itself is heat tolerant, so the ceiling comes from the equipment and from by-products rather than from the material, which means heat can be supplied generously and throughput pushed up. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. With a wide size spread the short path wins: fines leave first and coarse material follows, and the moisture spreads out as a result. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for iron-manganese slag by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.

Plastics & rubber 21 items

Plastics & rubber —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
Plastic pellets PP,PE	Granular	Moderate	Flash Airflow Dryer	Rotary Dryer	Drying plastic pellets sets two requirements that pull against each other: the surface water film has to go, and the pellets must not melt or stick together. If moisture stays on the surface, static builds up, the pellets begin to stick and ball, the conveying line bridges, and the injection or extrusion downstream comes out with surface defects. Raise the temperature and the pellets soften and go tacky, which makes the clumping worse. Controlling the temperature is therefore not about driving the water off faster, it is about keeping the pellets from softening in the first place. Our configuration is a flash airflow line: the pellets are carried by the hot air and heat transfer completes within seconds, the contact time is too short to melt them, and a cooling section brings them back to ambient before packaging. The rotary drum is the alternative, for grades that need a longer residence time or tolerate more heat. Dust collection is the other focus: plastic powder is combustible dust, the collector has to be selected for combustible dust with explosion venting, grounding and duct bonding, as required by GB 15577-2018. Detail →
PET flakes	Flake	Moderate	Rotary Dryer	Flash Airflow Dryer	Flakes break easily; drum speed and flights need control. Flakes are not afraid of heat, they are afraid of being crushed and folded; every contact between equipment and material can leave a reject. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. Throughput on a drum is set by working volume and residence time together, so the denser and more solid the material, the more the drum can hold. Flakes stick together into lumps, so both the feed section and the flight pattern have to be matched to how strong the flakes are. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. When ordering, ask for PET flakes by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
PVC resin	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	PVC powder is harder to handle than plastic pellets for three reasons. First the particle size: PVC powder has a high fine fraction, and in pneumatic conveying the fines are carried into the duct and the dust collector, so a cyclone has to recover them without the air being so violent that it disperses the bed. Second the melting window is narrow: PVC softens at a moderate temperature, and a slightly loose temperature control leads to wall build-up and caking, which is exactly what the seconds-long heating of a flash dryer keeps to a minimum. Third, static and hygroscopicity: once PVC powder takes on moisture it cakes in the screw and the hopper, which hurts downstream processing. Our configuration is a flash airflow line with cyclone separation: the main separator splits the product from the coarse fraction and the fines are captured separately, either returned to the line or sold as a different grade. In other words the dust collection here is not only an environmental requirement, it also does the classification and protects the yield. We have run a case taking moisture from 25 points down to 1 point, at which level the material goes straight into processing without a second pass. Detail →
Recycled plastic flakes	Flake	Moderate	Rotary Dryer	Flash Airflow Dryer	Uneven contamination and moisture; add washing and dewatering upstream. Flakes bridge easily, so the feed section needs a disintegrator or forced feeding; once the material balls up and blocks the inlet, the best hot air in the building is wasted. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Flakes stick together into lumps, so both the feed section and the flight pattern have to be matched to how strong the flakes are. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for recycled plastic flakes, because two materials of the same form can differ by a whole machine size.
Rubber powder	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Excessive heat causes softening and sticking. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. When ordering, ask for rubber powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Lignin	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Stickiness varies with moisture; the disintegration step affects drying. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. If the incoming grade of lignin is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Cellulose ether HPMC	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive and prone to caking; temperature control and disintegration must be considered together. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for cellulose ether, because two materials of the same form can differ by a whole machine size.
Guar gum	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive; flash drying helps retain viscosity. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Send a sample with the enquiry. The moisture and bulk density of the actual guar gum decide the machine size far more than the name does.
PE powder	Powder	Moderate	Flash Airflow Dryer	Electric Heating Dryer	Mainly surface moisture; control temperature to prevent softening and caking. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of PE powder is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
PP powder	Powder	Moderate	Flash Airflow Dryer	Electric Heating Dryer	As above; watch dust and static. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for PP powder, because two materials of the same form can differ by a whole machine size.
ABS powder	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Heat-sensitive; keep a margin on the temperature limit. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. When ordering, ask for ABS powder by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.
Polycarbonate powder	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Strongly hygroscopic and heat-sensitive; pack immediately after drying. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. Do not describe the material only as powder or granules: give the measured moisture and bulk density for polycarbonate powder, because two materials of the same form can differ by a whole machine size.
Polystyrene powder	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Low softening point; hold the temperature steady. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The heating time for this material is measured in seconds; the hot air can run hot, but the material temperature itself has to be held down, because past the threshold it discolours, denatures or cakes. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. If the incoming grade of polystyrene powder is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Nylon (PA) powder	Powder	Heat-sensitive	Flash Airflow Dryer	Electric Heating Dryer	Strongly hygroscopic; store sealed after drying. Powder moves only if the hot air carries it, so what decides the route is whether the air has enough momentum and whether the duct is sized right, not whether the material flows by itself. Heat sensitive material has a narrow process window, so inlet temperature and residence time can only be set conservatively and throughput usually has to be raised later, once trial run data is in. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is an electrically heated dryer, which is the route to switch to where gas is inconvenient or there is a hard requirement on cleanliness and open flame. Do not describe the material only as powder or granules: give the measured moisture and bulk density for nylon (PA) powder, because two materials of the same form can differ by a whole machine size.
EVA powder	Powder	Heat-sensitive	Flash Airflow Dryer	Batch Rotary Dryer	Low melting point; seconds of exposure is the safer route. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. Overshooting the heat limit is not recoverable: it is not that the material dries more slowly, it is that the quality is written off, so it is better to protect the temperature than to protect the output. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Local overheating is the danger with heat sensitive powder: a layer stuck to the wall keeps heating one spot, so the flights and the air volume have to keep the bed from clinging. The alternative is a batch rotary dryer, which is the route to switch to when batches are small, products are mixed and changeover is frequent. Send a sample with the enquiry. The moisture and bulk density of the actual EVA powder decide the machine size far more than the name does.
Colour masterbatch	Granular	Moderate	Flash Airflow Dryer	Rotary Dryer	Limited granule strength; tumbling and conveying must be gentle. Granules can be carried by hot air or lifted by the flights inside a drum, so the route comes down to throughput scale and to how strong the granules are. At high temperature this material loses water first and discolours later, so holding the temperature is enough, but the combination of temperature and time still has to be confirmed by trial run. An airflow line is demanding about the state of the feed: what enters must already be a granule or powder that can be conveyed, because too much moisture makes it cake in the conveying section. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. If the incoming grade of colour masterbatch is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Pulverised plastic regrind	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Uneven contamination and moisture; add cleaning and dewatering upstream. If the powder is still wet when it enters the machine it will ball up in the conveying section; by the time it reaches the heat exchange zone it has to be loose, or even good hot air cannot move it. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The advantages of flash are the short heating time and the minimal mechanical action on the material; the cost is that throughput is capped by air volume and duct size, and very large lines still need a drum. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Send a sample with the enquiry. The moisture and bulk density of the actual pulverised plastic regrind decide the machine size far more than the name does.
Filled masterbatch	Granular	Moderate	Rotary Dryer	Flash Airflow Dryer	Fairly high bulk density; drum size set by throughput. Granules have a higher bulk density than powder, so drum fill can be set more generously than for powder, but room must still be left for the material to tumble. The material tolerates moderate to high temperature for a while but not a long dwell, so the process needs temperature margin built in. The drum route does not care about material form: lumps, paste and fibre all go in, at the cost of a large footprint and high initial investment. Granules rub against each other inside the drum, so a material with a high fine fraction also means thinking about drum liners and discharge-end dust collection. The alternative is a flash airflow dryer, which is the route to switch to when throughput is modest and the material needs a shorter heating time. Do not describe the material only as powder or granules: give the measured moisture and bulk density for filled masterbatch, because two materials of the same form can differ by a whole machine size.
Phenolic resin	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Thermosetting resin; control temperature to prevent premature curing. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. Do not describe the material only as powder or granules: give the measured moisture and bulk density for phenolic resin, because two materials of the same form can differ by a whole machine size.
Epoxy resin	Powder	Moderate	Flash Airflow Dryer	Rotary Dryer	Thermosetting resin; control temperature to prevent premature curing. Powder has a low bulk density and takes up a lot of volume for the same weight, so drum size is usually worked out backwards from the throughput rather than from the material. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A flash airflow dryer completes heat transfer between the hot air and the material in a few seconds inside the duct, so residence time is measured in seconds and heat sensitive material should go this way. Powder that sits for long enough will bridge, so the feed end needs a breaker or forced feeding; every blockage stops the line. The alternative is a rotary dryer, which is the route to switch to when the material needs a longer residence time or the line is scaling up to tens of tonnes a day. If the incoming grade of epoxy resin is not the one quoted before, the parameters have to be given again rather than carried over from an earlier order.
Plastic flake	Flake	Moderate	Rotary Dryer		Flake regrind; control temperature to avoid softening and sticking. Thin flakes transfer heat quickly and can be dried hard, but the price is tighter demand on air velocity and on temperature uniformity. It is a material that can be heated but must not be baked, so the set temperature needs margin, and final moisture depends on moisture temperature and drying intensity as well. A rotary dryer lifts and drops the material repeatedly with flights to form a curtain, so the material stays inside for minutes to tens of minutes, which suits heavy, heat tolerant material. Flakes stick together into lumps, so both the feed section and the flight pattern have to be matched to how strong the flakes are. The process route is fairly specialised and there is little room to switch equipment, so the configuration has to be right the first time. When ordering, ask for plastic flake by name and give the actual moisture and bulk density of the incoming material, so the machine size can be fixed in one pass.

Paper & printing 3 items

Paper & printing —— drying route by material
Material	Form	Heat sensitivity	Recommended dryer	Alternative	Selection notes
Label paper	Flake	Heat-sensitive	Flash Airflow Dryer	Rotary Dryer	Flakes cannot be rubbed, and that is the first hard constraint in selecting the machine. A label paper has three layers: the base paper, the coating and the adhesive, and the coating fails first — pushed past its limit it forms a hard skin, the surface turns brittle and curling follows. Our approach is a flash airflow line: the sheets are carried by the hot air and heat transfer is completed within seconds, with almost no mechanical action. The inlet temperature is set by the coating's heat limit, typically somewhere between 120 and 150°C depending on the grade, and the air volume is adjusted separately: hold the temperature first, then raise the air volume slowly so the sheets do not curl as they dry fast. At 500 kg/h dry basis taking moisture from 30 percent down to 2 percent, an airflow line needs parallel units or a larger air volume, so calculate the evaporation rate before selecting rather than sizing on dry tonnes. Detail →
Coated paper	Flake	Heat-sensitive	Flash Airflow Dryer	Rotary Dryer	This is the same problem as label paper, but the coated face is more heat sensitive. Coatings usually contain wax, starch or a pigment binder, and under heat they soften first and then skin over; above a certain temperature the sheet shows speckling or loses powder, and the web contracts unevenly. The route is still mainly the flash airflow line, because the residence time is measured in seconds and the coating has not had time to accumulate heat before it leaves the drying zone. Set the inlet temperature by the grade's ceiling and start below 130°C to leave margin for batch variation, adjusting air volume and temperature separately: take the surface moisture off with low air volume first, then raise it gradually, so the sheet does not lose water at the surface fast enough to curl. Coated paper also shrinks across the web, and the moisture difference between positions in one sheet shows up directly as curl, so the discharge end needs flattening and cooling designed in — a curtain or belt cooler is more stable than free fall. Detail →
White card board	Flake	Heat-sensitive	Flash Airflow Dryer	Rotary Dryer	The difficulty with white cardboard is not heat sensitivity but stiffness and deformation. As the web dries it loses both moisture and stiffness; while it is still wet it cannot carry its own weight, and coming out of the dryer it folds, takes a crease and curls at the edges. The advantage of a flash airflow line is that the material is carried by the hot air the whole way, with a small drop height and little mechanical action on the sheet, provided the conveying upstream is steady and the web never enters folded or doubled. The inlet temperature follows the grade ceiling, and white cardboard is more forgiving than coated stock; air volume and velocity are the other variable, because too high a velocity lifts an already formed sheet and makes the edges shrink unevenly. What to confirm at selection is the adjustable range of the air volume, not simply whether it can dry. Moisture has to be even, with the cross-direction spread kept within one percentage point, otherwise curl and dimensional instability are hard to avoid. Detail →

Supported Materials

Chemical raw materials 36 items

Fine chemicals & pigments 21 items

Pharmaceuticals & herbal medicine 16 items

Pesticides & fertilisers 16 items

Inorganic salts 18 items

New energy & battery materials 17 items

Metallurgy & metal powders 14 items

Building materials & minerals 20 items

Feed & livestock 34 items

Food & agricultural products 29 items

Environmental & biomass 12 items

Plastics & rubber 21 items

Paper & printing 3 items

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