Classification of bentonite
The type of interlayer cation of bentonite determines the type of bentonite. When the interlayer cation is Na+, it is called sodium bentonite; when the interlayer cation is Ca2+, it is called calcium bentonite; when the interlayer cation is H+, it is called hydrogen bentonite (active clay); When the cation is an organic cation, it is called organic bentonite.
Hydrogen bentonite (active clay)
Activated clay is an adsorbent made of clay (mainly bentonite) as raw material, treated by inorganic acidification, rinsed with water, and dried. The appearance is milky white powder, odorless, tasteless, non-toxic, strong adsorption, and can be adsorbed. Colored substances, organic substances. It is easy to absorb moisture in the air, and it will reduce the adsorption performance if it is placed for too long. However, when heated to above 300 degrees Celsius, it begins to lose crystal water, which is a change in structure and affects the fading effect. The activated clay is insoluble in water, organic solvents and various oils, and is almost completely soluble in hot caustic soda and hydrochloric acid. The relative density is 2.3 to 2.5, and the swelling in water and oil is extremely small.
Organic bentonite is an inorganic mineral/organic ammonium composite. It uses bentonite as raw material and utilizes the lamellar structure of montmorillonite in bentonite and its ability to swell and disperse into colloidal grade clay in water or organic solvent. The technology is made by inserting an organic covering agent. Organic bentonite can form gel in various organic solvents, oils and liquid resins, and has good thickening, thixotropic, suspension stability, high temperature stability, lubricity, film formation, water resistance and chemical stability. It has important application value in the coating industry. It is also widely used in paint, ink, aviation, metallurgy, chemical fiber, petroleum and other industries.
Bentonite is a multi-purpose mineral whose quality and application are mainly determined by the smectite content and type of properties and its crystal chemistry. Therefore, its development and utilization must vary from mine to mine, depending on the role. Such as the production of activated clay, calcium-based sodium, for drilling and grouting for oil drilling, instead of starch for spinning, printing and dyeing paste, building materials for interior and exterior wall coatings, preparation of organic bentonite, synthesis of 4A zeolite with bentonite, production White carbon and so on.