Kaolin is a general term for a group of clay minerals. Its basic composition is kaolinite group and kaolinite group. It is mainly composed of kaolinite and halloysite. The content is over 90%, followed by hydromica. There are pyrite, limonite, anatase, quartz, chalcedony, alum, etc., and sometimes a small amount of organic matter. Kaolin is widely used in ceramics, paper, rubber, plastics and refractory industries due to its excellent processability such as plasticity, cohesiveness, sinterability and fire resistance.
The processing of kaolin ore depends on the nature of the ore and the end use of the product. There are two processes used in industrial production: dry process and wet process. Usually, hard kaolin is produced by dry process, and soft kaolin is produced by wet process. Below, Shanghai Clirik will introduce the kaolin mineral processing technology in detail.
The dry process is a simple and economical process. The produced ore is crushed to 25.4mm by a hammer crusher, and then fed into a fine jaw crusher to reduce the particle size to 6.35mm. The crushed ore is blown by a centrifugal separator and a cyclone. The Raymond mill is further ground. 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. Dry Separator Kaolin Raymond Mill