The distinction between bentonite and attapulgite and their respective uses
Bentonite is also called bentonite, bentonite and bentonite rock. The development and use of bentonite in China has a long history, but it was only used as a kind of detergent. (in Sichuan Renshou area, there was an open-air mine hundreds of years ago, and the local people called bentonite as earth powder). What is widely used but only a few hundred years of history. The earliest discovery in the United States was the yellowish green clay in Wyoming's ancient state, which expanded into a paste after adding water. Later, people referred to all these clays as "bentonite". In fact, the main mineral composition of montmorillonite is montmorillonite, the content is 85-90%, and some properties of bentonite are also determined by montmorillonite. Montmorillonite can be a variety of colors, such as yellow green, yellow white, gray, white and so on. Can be dense, massive, or for loose soil, with fingers rubbed when there is a sense of sliding, small pieces of water after the volume of swelling several times to 20-30 times, in the water as a suspended shape, less water when it was mushy. The properties of montmorillonite are related to its chemical composition and internal structure.
Is a non-metallic mineral montmorillonite as the main mineral composition, structure of montmorillonite is 2:1 type crystal structure consists of two silicon oxygen tetrahedron sandwiching a layer of alumina eight body composition, due to the layered structure of montmorillonite crystal cell formation in the presence of some cations, such as Cu, Mg, Na, K, and the cation with montmorillonite crystal cell. Is not stable, easy to by other cation exchange, so it has good ion exchange property. Foreign countries have already applied 24 fields and more than 100 departments in industry and agriculture. There are more than 300 products, so people call it "omnipotent soil""
A crystalline hydrated magnesium aluminum silicate, has a unique layer chain structure characteristics, existing lattice replacement in the structure for crystal contains no quantitative Na+, Ca2+, Fe3+, Al3+, crystal acicular, fibrous or fiber shape. Attapulgite has a unique dispersion, high temperature resistance, salt resistance and other good colloidal properties and higher adsorption and decolorization capacity. And has certain plasticity and cohesive force, its ideal chemical formula is: Mg5Si8O20 (OH) 2 (OH2) 4, 4H2O. Having an intermediate structure between a chain structure and a layered structure. Attapulgite Chengtu shape, dense block produced in sedimentary rocks and weathering crust, color white, gray white, gray green, gray green or weak silky luster. The soil is exquisite, greasy and slippery, light and brittle, and the fracture is shell like or irregular, with strong water absorption. With viscosity and plasticity when wet, small shrinkage after drying, not show cracks, water immersion collapse. The suspension does not flocculate and settle in the dielectric.
