The main component of bentonite is montmorillonite, which is a layered clay mineral composed of two layers of siloxane octahedron with a layer of aluminoxy octahedron. According to the type, content and crystallization chemistry of the exchangeable cations contained in montmorillonite, it is classified into bentonite such as sodium, calcium, magnesium or aluminum (hydrogen). It can be made into a dense block or a loose soil. It has a slippery feel when rubbed with a finger. The volume of the small block is several times to several tens of times when it is added with water. It is suspended in water and has a paste when there is little water. Bentonite has strong cation exchange performance, can be used to remove oil toxins, gasoline and kerosene purification and wastewater treatment; due to good water swelling properties and dispersion, suspension and pulpability, can be used for drilling mud, flame retardant ( Suspension fire extinguishing), which can be used as filler in the paper industry, and optimize the performance of coatings, such as adhesion, hiding power, water resistance, scrub resistance, etc.; because of good adhesion, it can also be used as a substitute for starch in the textile industry. The yarn in the sizing is both grain-saving and hairless, and does not emit odor after the pulp.