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Building materials & minerals drying equipment selection: form, heat sensitivity and recommended machine for 20 materials (Quartz sand, River sand, Manufactured sand and others), with the full line configuration and trial run points.
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20 material(s) listed for this industry.
Building materials & minerals 20 items
| Material | Form | Heat sensitivity | Recommended dryer | Alternative | Selection notes |
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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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