Kaolin dryer is widely used to dry powdery, granular, bar and block materials like puremineral powder, slag, limestone, pulverized coal, clay, kaolin and so on in building material, metallurgy, chemical and cement industry. It has a better effect in kaolin, clay and bentonite drying.
Technical advantage of kaolin drying machine:
1. It is suitable for powder, granule shape raw materials which have special requirements to drying. For example: GP vesicant, less, light calcium carbonate, active white earth, magnetic powder, graphite, medical slag and so on.
2. It is suitable for drying raw materials that have large size and heavy specific gravity. For example: ore, slag of blast furnace, coal, metallic powder, phosphorus fertilizer, ammonium sulphate and so on.
3. Choose different methods of dust treatment such as cyclone separator, bag filter and washing tower according to the carbon content in tail gas.
4. It is suitable for the material which need cooling, and need large quantity continuous operation.
5. If need high drying temperature should be noted when order.
The kaolin dryer is made up of a large, rotating cylindrical tube, usually supported by concrete columns or steel beams. The dryer slopes slightly so that the discharge end is lower than the material feed end in order to convey the material through the dryer under gravity. Material to be dried enters the dryer, and as the dryer rotates, the material is lifted up by a series of internal fins lining the inner wall of the dryer. When the material gets high enough to roll back off the fins, it falls back down to the bottom of the dryer, passing through the hot gas stream as it falls. This gas stream can either be moving toward the discharge end from the feed end (known as co-current flow), or toward the feed end from the discharge end (known as counter-current flow). The gas stream can be made up of a mixture of air and combustion gases from a burner, in which case the dryer is called a direct heated dryer. Alternatively, the gas stream may consist of air or another (sometimes inert) gas that is preheated. When the gas stream is preheated by some means where burner combustion gases do not enter the dryer, the dryer known as an indirect-heated type. Often, indirect heated dryers are used when product contamination is a concern. In some cases, a combination of direct-indirect heated rotary dryers are also available to improve the overall efficiency.
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