Modification of bentonite and its application in environmental management
Due to structural factors, the inner surface area of natural bentonite is relatively large, and the inner surface brings huge inner surface energy, which makes it have better adsorption capacity. Although the adsorption performance of bentonite is good, under unmodified conditions, when natural bentonite is in water, the interlayer ions will undergo hydrolysis reaction, reducing its adsorption capacity, which also limits the application of bentonite in pollution treatment. Therefore, there are It is necessary to modify the bentonite.
The 6 major modification methods of bentonite, a general lecture, you will understand after reading it!
The modification operation of bentonite usually uses three methods, such as physical, chemical and mechanical, to treat the surface of natural bentonite. According to the desired purpose, the physical or chemical properties of the bentonite surface are changed to meet the needs of different technical fields. For the application of bentonite, it can also improve the function and use value of the bentonite itself, some are used to change the characteristics of the bentonite, some change a certain ability of the bentonite, and improve the corresponding ability effect.
How to Identify Bentonite Clay
In the naked eye identification, high-quality bentonite is pure white, generally gray or light yellow-white, often light green, light blue, rose red and other colors due to water absorption or impurities. It remains pure white, gray or light yellow-white after air-drying. After breaking it by hand, the section is not flat, but it is jelly-like. It has a grease luster and feels slippery to the touch.
Technical introduction of bentonite
The United States has been leading the research on bentonite in the world, and many domestic standards for bentonite products are also based on American standards. Some European countries, Japan and South Korea also have more advanced technology on some products. Compared with foreign countries, domestic product and market development is relatively slow, and the products are mainly conventional products. This has a lot to do with the domestic environment, policy and resource status.
The properties of montmorillonite are closely related to the types of exchangeable cations between layers. According to the types of main exchangeable cations between layers, montmorillonite is usually divided into calcium montmorillonite and sodium montmorillonite.