Bentonite is a main component of montmorillonite,By the two silicon-oxygen tetrahedron intervening layer of aluminum oxygen octahedron composed of layered clay mineral.According to the content of montmorillonite type of exchangeable cation, Content and crystallization of different chemical nature,Into sodium, calcium, magnesium, and Al (OH) - such as bentonite.

   Bentonite areas of application is very extensive.Since 1920 the United States has begun to replace the general application of bentonite clay,Foundry sand binder used,Its field of application in machine-building, metallurgy, drilling, oil, chemicals, food, environmental protection and other industries to expand. According to incomplete statistics, According to China's current annual sales of bentonite products of about 2.7 million tons,Casting for which 100 ~ 110 million tons of sand, Drilling for 700,000 tons,Metallurgical pellet 450,000 tons,Oil for bleaching (activated clay) 200,000 tons,For the other 20 to 30 million tons.

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