Kaolin (Washed China clay)Kaolinite is a clay mineral. It is a layered silicate mineral, with one tetrahedral sheet linked through oxygen atoms to one octahedral sheet of alumina octahedra. Rocks that are rich in kaolinite are known as china clay, white clay, or kaolin.
Photograph : China clay mines in Chittorgarh Rajasthan
Uses of Kaolin( Washed China clay)
Kaolin is used in ceramics, medicine, coated paper, as a food additive, in toothpaste, as a light diffusing material in white incandescent light bulbs, and in cosmetics. It is generally the main component in porcelain.
It is also used in paint to extend titanium dioxide (TiO2) and modify gloss levels; in rubber for semi-reinforcing properties; and in adhesives to modify rheology.
Kaolin was also used in the production of common pipes for centuries in Europe and Asia.
The largest use is in the production of paper, including ensuring the gloss on some grades of paper. Commercial grades of kaolin are supplied and transported as dry powder, semi-dry noodle or as liquid slurry.
Kaolinite can contain very small traces of uranium and thorium, and is therefore useful in radiological dating. While a single magazine made using kaolin does not contain enough radioactive material to be detected by a security-oriented monitor, this does result in truckloads of high end glossy paper occasionally tripping an overly-sensitive radiation monitor.
Kaolinite has also seen some use in organic farming, as a spray applied to crops to deter insect damage, and in the case of apples, to prevent sun scald.
China clay deposits in India
In India, china clay deposits are found mainly in Rajasthan and Gujarat state. In Rajasthan pure white brighness china clay found in Chittorgarh district. In Gujarat, Bhuj, Kheda are deposits area.
China clay consumption market:
Washed china clay, kaolin consumption market is Gujarat. Morbi, Wankaner, Dhuva, and Thangadh, is famous ceramics zone in India.
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