Bentonite is a non-metallic mineral with montmorillonite as the main mineral composition. Montmorillonite structure is composed of two silica tetrahedra and a layer of aluminum oxide octahedron 2: Type 1 crystal structure, due to the lamellar structure formed by montmorillonite cells there are some cations, such as Cu, Mg, Na, K, etc., and the interaction between these cations and montmorillonite cells is very unstable, easy to be exchanged by other cations, so it has good ion exchange. Abroad, it has been applied in more than 100 departments in 24 fields of industrial and agricultural production, with more than 300 products, so people call it "universal soil".