Introduction: Calcium bentonite is a raw material used for advanced and fine processing of bentonite.

Performance: calcium bentonite is absorptive, expansive, water suspensive, cohesive, plastic, refractory, and ion exchangeable, and also possesses other desirable properties.

Major applications: calcium bentonite is mainly used in three sectors: mechanical foundry, metallurgical pellet, and drilling mud. Thanks to its properties, it is also widely used in chemical fertilizer, agricultural pesticide, soil improvement, foundation, embankment works, wastewater treatment, fodder, textile and printing & dyeing, etc. Bentonite is extensively used after being made into binding agent, water repellant, and carrier.

1) physical adsorption. The physical adsorption is the intermolecular attraction between the adsorbent and the adsorbed mass, that is, we often say the Fan Dehua force. Physical adsorption is a reversible process, and the adsorption rate and desorption rate are dynamic equilibrium under certain conditions. The main reason for the generation of physical adsorption is the surface energy of the bentonite. Because of the high dispersion of bentonite in water, the phenomenon of physical adsorption is very obvious.

2) chemical adsorption. Chemical adsorption is the chemical bond between the adsorbent and the adsorbed mass, which is generally not reversible. Chemical used in drilling mud treatment agent is a chemical adsorption of typical examples, such as chromium iron wood lignosulfonate is added to bentonite slurry is the use of chromium ion in the edge of the bentonite crystal integrated adsorption. The chemical adsorption is more stable than the physical adsorption. Therefore ferrochrome lignosulfonate treatment of bentonite slurry with high temperature tolerance, as geothermal and ultra deep well anti high temperature mud system.

3) ion exchange adsorption. Bentonite mineral crystals generally carry a negative charge, and so on the surface of bentonite particles to adsorb and so on the equivalent of the opposite charge of the cation. The adsorption of cations can be exchanged with the cations in solution, which is called ion exchange adsorption. The characteristics of ion exchange adsorption are: the same number of ion exchange, and so on. The reaction of ion exchange adsorption is reversible, and the adsorption and desorption rate are influenced by the ion concentration, which is in accordance with the law of mass action.