After grinding and washing processing, bentonite become the finished product that can be used in some fields.In these processing, some mining machines are at demands,such as mtm trapezium grinder,t130x reinforced ultrafine mill,mtw milling machine and so on.
Bentonite is a kind of clay, often containing a small amount of illite, kaolinite, chlorite, Elo stone, quartz, feldspar, zeolite and calcite, which hardness is 1 ~ 2 and density is of 2 ~ 3g/cm3. According to the kinds of exchangeable cation, content and layer charge, bentonite can be divided into Na bentonite (alkaline soil), calcium base bentonite (alkaline soil), natural bleaching earth (acidic soil or clay acid), in which calcium bentonite and sodium calcium base and calcium and magnesium based etc.
Bentonite is an absorbent aluminium phyllosilicate, essentially impure clay consisting mostly of montmorillonite. The absorbent clay was given the name bentonite by Wilbur C. Knight in 1898, after the Cretaceous Benton Shale near Rock River, Wyoming.
There are different types of bentonite, each named after the respective dominant element, such as potassium (K), sodium (Na), calcium (Ca), and aluminium (Al). Experts debate a number of nomenclatorial problems with the classification of bentonite clays. Bentonite usually forms from weathering of volcanic ash, most often in the presence of water. However, the term bentonite, as well as a similar clay called tonstein, has been used to describe clay beds of uncertain origin. For industrial purposes, two main classes of bentonite exist: sodium and calcium bentonite. In stratigraphy and tephrochronology, completely devitrified (weathered volcanic glass) ash-fall beds are commonly referred to as K-bentonites when the dominant clay species is illite. Other common clay species, and sometimes dominant, are montmorillonite and kaolinite. Kaolinite-dominated clays are commonly referred to as tonsteins and are typically associated with coal.
The bentonite has good absorbent expansion properties, dispersion and suspension and mud, so for drilling mud, flame retardant (suspended fire), sewage treatment; also can do filler in papermaking industry, performance can be optimized coating such as adhesion, covering power, water resistance, scrub resistance; because it has good cohesive force, can replace starch for textile industry in the yarn sizing is grain, and non-pilling, peculiar smell is not a propeller, is really one a double.
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