bentonite

Bentonite with montmorillonite as the main mineral composition of nonmetallic minerals, montmorillonite structure is made up of two silicon oxygen tetrahedron clip a layer of alumina 2:1 type of octahedral crystal structure, because of montmorillonite crystal cell layer structure formed by some cation, such as Cu, Mg, Na, K, etc., and the cation with montmorillonite crystal cell function is not very stable, easy to by other cation exchange, therefore has good ion exchange. Foreign countries have been in industrial and agricultural production in 24 fields in more than 100 departments of application, there are more than 300 products, so people call it "universal land". Bentonite is also called bentonite, bentonite, or bentonite. The development and use of bentonite in China has a long history. It was originally used as a detergent. (The Renshou area of Sichuan Province has had open-pit mines for hundreds of years, and the local people call bentonite soil powder.) It has been in widespread use for only a hundred years. The earliest discovery in the United States is in the ancient strata of Wyoming, yellow-green clay, after adding water can expand into a paste, later people put all the clay with this property, collectively called bentonite. In fact, the main mineral composition of bentonite is montmorillonite, the content of which is 85-90%. Some properties of bentonite are also determined by montmorillonite. The montmorillonite can be in a variety of colors such as yellow - green, yellow - white, gray, white and so on. It can be a dense block or a loose soil. It feels slippery when rubbed and rubbed by fingers. After adding water, the volume of small pieces expands several times to 20-30 times, and is suspended in water. The properties of montmorillonite are related to its chemical composition and internal structure.