The dry process is a simple and economical process. The produced ore is crushed to 25.4mm by a hammer crusher and fed into the cage crusher to reduce the particle size to 6.35mm. The hot air in the cage crusher reduces the moisture of the kaolin from 20% of the produced water. About 10%. The crushed ore is further ground by a blown Raymond mill equipped with a centrifugal separator and a cyclone. This process removes most of the sand and the product is commonly used in low-cost fillers in the rubber, plastics and paper industries. When used in the paper industry, the product can be used as a filler in the filler layer with an ash content of less than 10% or 12%. At this time, the brightness of the product is not high.
When the dry method requires high whiteness of the product, the product produced by Raymond mill must be dry-removed. The dry process has the advantages of eliminating the dehydration and dry process of the product, reducing the loss of the ash powder, short process flow and low production cost, and is suitable for drought and water shortage areas. However, it is necessary to rely on the wet process to obtain high-purity high-quality kaolin.