Kaolinite is a clay mineral, part of the group of industrial minerals, with the chemical composition Al2Si2O5 (OH) 4.
Uses:
1- paper industry which consumption about 50 % of world kaolin production that 30% of paper is kaolin so it become soft, glassy touch, High-brightness, low abrasion water-washed, to improve brilliance, smoothness, and ink receptivity..
2- plastic industry: because it give the surface soft touch, resistance to chemicals, fixed form, and not electric transmitted, reduced cracking, warping and crazing,
3-ceramic industry: it is the essential substance in this industry, they make several tests to measure pottery coefficient, color degree after firing, shrinkage degree, viscosity degree, degree of firing, casting degree.
4- rubber industry: to increase tension strength, increase corrosion resistance, increase solidification, and also decrease the coast.
5- painting industry: use due to its chemical inert and covering pores, low coast white color, and dissolution in painting,
6- Refractories :contain flint clay to give a dense, strong product able to withstand much higher temperatures.
7- Adhesives and sealants Kaolin is used to control flow, penetration, and specific adhesion on application, and adhesive strength, tear strength, tensile strength, and elongation after cure.
8- Other Uses Kaolin clays are used in the manufacture of aluminum chemicals, 9- bricks,
10-cements,
11- cosmetics, pharmaceuticals,
12- animal feeds, fertilizers, catalysts, wallboard, printing ink, linoleum, flexible tile, pesticides,
13-Kaolinite can contain very small traces of uranium and thorium, and is therefore useful in radiological dating.
14- 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.
15- When heated to between 650 and 900 °C kaolinite dehydroxylates to form metakaolin. |
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