Kaolin is a white clay composed of the mineral kaolinite. It is formed during the destruction (weathering) of granite, gneisses and other rocks containing feldspar (primary kaolins). By washing primary kaolins, they are deposited again in the form of sedimentary rocks; secondary kaolins are formed, also called “kaolin clays”. Formula: Al2O3*2SiO2*2H2O
Application of kaolin
For the production of porcelain and ceramics
The main properties of kaolin are high refractoriness, low plasticity and binding ability.
In paper production
Kaolin is used in the manufacture of calico and other binding materials, and is also a component of the coating (chalking) of coated paper and board
In refractory products
Natural kaolin is used to a limited extent in the manufacture of chamotte, semi-acid refractory bricks, building ceramics and white cement.
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