Kaolin is a type of clay mineral that is processed through grinding to produce fine particles between 80-1000 mesh. This processing improves its brightness, whiteness, and particle size distribution, allowing it to be used in a wide range of applications including ceramics, refractory materials, papermaking, rubber products, petrochemical processes, and materials for the nuclear and aerospace industries. The document provides examples of specific uses of kaolin and advertises grinding mill equipment from a manufacturer for processing kaolin.