The main chemical formula of kaolin is AL2O3-2SiO2-2H2O. Its main minerals are kaolinite and kaolinite. In addition to kaolinite cluster minerals, there are other minerals such as montmorillonite, illite, pyrophyllite, quartz and feldspar, In general the composition is more complicated.
Bentonite clay belongs to the nature of clay compared to kaolin only montmorillonite relatively simple, natural layered aluminosilicate bentonite is a clay content of montmorillonite clay minerals, with water thixotropy, swelling, lubricity , In chemical coatings, pellet casting, subway piling, traversing construction and other industries have been used.
The only essential difference between bentonite and kaolin clay is kaolin refractory suitable for ceramics, the earliest time Jingdezhen, Jiangxi Province are made of ceramic kaolin, bentonite is not enough. Kaolin can not be applied in engineering industry. Kaolin and bentonite as the following two pictures to be compared only from the appearance is indistinct, but from the use of the distinction is good to distinguish.