Bentonite (Bentonite) is a non metallic mineral montmorillonite as the main mineral composition, structure of montmorillonite is 2:1 type crystal structure consists of two silicon oxygen tetrahedron sandwiching a layer of alumina eight body composition, due to the layered structure of montmorillonite crystal cell formation in the presence of some cations, such as Cu, Mg, Na, K, and the cation with montmorillonite crystal cell function is not stable, easy to by other cation exchange, so it has good ion exchange property. Foreign countries have already applied 24 fields and more than 100 departments in industry and agriculture. There are more than 300 products, so people call it "omnipotent soil"". Montmorillonite is an hydrous clay mine dominated by montmorillonite. The chemical composition of montmorillonite is: (Al2, Mg3) Si4O10, OH2, nH2O, because it has special properties. Such as swelling, adhesion, adsorption, catalysis, thixotropy, suspension and cation exchange
Bentonite with good physical and chemical properties, known as the "universal" clay said, as binder, suspending agent, thixotropic agent, stabilizer, purification and decoloring agent, filler, catalyst feed, etc., are widely used in oil exploration, directional drilling, steel casting, metallurgical pellet, chemical coating, compound fertilizer, sizing rubber, plastic, paper, and water purification, moisture absorption agent, pesticides and other fields