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Fine chemicals & pigments drying equipment selection: form, heat sensitivity and recommended machine for 21 materials (Titanium dioxide, Iron oxide pigment, Organic pigment and others), with the full line configuration and trial run points.
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21 material(s) listed for this industry.
Fine chemicals & pigments 21 items
| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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Recommendations above are a selection direction based on material form, heat sensitivity and throughput. Capacity varies with the material, the initial moisture content and the target final moisture, and the formal figures come from a trial run.
Four steps to a selectionHow to choose
- Material form Powder, granule and flake material can be carried in an air stream; blocky, paste-like and fibrous material has to be tumbled inside a drum.
- Heat sensitivity This comes first. Where the material is heat-sensitive and its form allows air conveying, a flash airflow dryer is the natural choice — regardless of output, because exposure to heat is measured in seconds. Material that tolerates heat can be dried more slowly and at lower cost.
- Throughput and budget Where budget and batch size matter more than output, a batch rotary dryer carries relatively low capital cost and suits a small plant or workshop. For high output, a continuous rotary dryer feeds and discharges at the same time and runs non-stop.
- Environment and energy Where emissions are constrained or there is no steam supply, electric and electromagnetic heating avoids an open flame and responds faster.
Where the material is corrosive (acidic, chloride-bearing, saline and so on), the parts in contact can be specified in stainless steel: 201 / 304 / 316L / 430 / 2205 duplex and other grades to order.
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Material · Selection · Trial run