Kaolin is a clay mineral, part of the group of industrial minerals, with the chemical composition Al2Si2O5(OH)4. It is a layered silicate mineral, with one tetrahedral sheet of silica (SiO4) linked through oxygen atoms to one octahedral sheet of alumina (AlO6) octahedra.
The name is derived from Chinese Kao-Ling , a village near Jingdezhen, Jiangxi province, China.), calaba, and calabachop (in Equatorial Guinea), “eko” ( in Nigeria)
Kaolin has a low shrink Cswell capacity and a low cation-exchange capacity. It is a soft, earthy, usually white mineral (dioctahedral phyllosilicate clay), produced by the chemical weathering of aluminium silicate minerals like feldspar. In many parts of the world, it is colored pink-orange-red by iron oxide, giving it a distinct rust hue. Lighter concentrations yield white, yellow or light orange colors. Alternating layers are sometimes found, as at Providence Canyon State Park in Georgia, US. Commercial grades of kaolin are supplied and transported as dry powder, semi-dry noodle or as liquid slurry.
Uses of Kaolin
Paper Industry: The primary use of kaolin is in the paper industry. It serves as a paper coating which improves appearance by contributing to brightness, smoothness and gloss. It also improves printability. Additionally, it is used by the paper industry as a filler reducing cost and the use of tree-based resources.
China, Porcelain and Tableware: Many people are under the mistaken impression that the only use for kaolin is in the manufacture of china. This is not true, and its use by the paper industry far exceeds its other uses. However, kaolin still serves as a valuable component in china and other tablewares. Its color, gloss and hardness are ideal characteristics for such products.
Other Uses: Kaolin has a variety of other uses in products including paint, rubber, cable insulation, specialty films and fertilizers. New uses are being discovered frequently, and ensure that the mineral will remain in demand for a long time.
Kaolin Superfine Powder Grinder has been widely used in making fine powder or micro powder, which is applicable to non-flammable and non-explosive materials with hardness less than 6, such as the calcite, chalk, limestone, dolomite, kaolin, bentonite, talcum, talc, diatomite, barite, gypsum, alum earth, graphite, fluorite, etc.
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