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Contact SupplierChina Clay is a hydrated Aluminium silicate, part of the group of industrial minerals, with the chemical composition Al2Si2O5(OH)4. 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 kaolin or china clay. Kaolinite has a low shrinkswell capacity and it is a soft, earthy, usually white mineral, 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. Commercial grades of kaolin are supplied and transported as dry powder, semi-dry noodle or as liquid slurry. The largest use is in the production of paper, including ensuring the gloss on some grades of paper. It is also used in paint, rubber, detergents & textile industries.
China Clay / Kaolin is used (or was used in the past):
As whitewash in traditional stone masonry homes in Nepal (the most common method is to paint the upper part with white kaolin clay and the middle with red clay; the red clay may extend to the bottom, or the bottom may be painted black) As a filler in Edison Diamond Discs As an indicator in radiological dating since kaolinite can contain very small traces of uranium and thorium
To soothe an upset stomach, similar to the way parrots (and later, humans) in South America originally used it[18] (more recently, industrially-produced Kaolinite preparations were common for treatment of diarrhea
For facial masks or soap As adsorbents in water and wastewater treatment.
Industrial Applications :
Appearance | White fine powder |
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Sp. gravity | 2.5 - 2.7 |
Oil absorption | 25 to 35 |
PH of 10% aqueous solution | 7 to 8 |
Water Soluble salts | Max 1.0% |
Volatile matter | Max 1.0% |
Loss on Ignition | : 13 to 15% |
Al2O3Al2O3 | 36.1% |
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SiO2SiO2 | 42.5% |
Fe2O3Fe2O3 | 0.5% |
MgO | 1.0% |
Na2ONa2O | 0.5% |
K2OK2O | 3.0% |
Grade | Brightness | Particle Size | Top Cut | Oil Absorption | Application |
---|---|---|---|---|---|
W.Kaolin 325 | 85%+ | 2 - 5 micron | 20 | 38 | Paints, Paper, Electrical |
W.Kaolin Lumps | 85%+ | 10 micron | 40 | 36 | Paints, Paper, Cosmetics, Electrical |
Kaolin 500 | 82% + | 15 micron | 50 | 32 | Paper, Rubber, Soaps |
Kaolin 300 | 80% | 20 micron | 50 | 32 | Rubber, Cosmetics & Soaps |
Apart from above grades we develop tailor made Kaolin to meet the specific requirement of our clients. Our R&D is also working on ultra-fine China Clay powders to develop many new products with exciting possibilities