Kaolin is a rock composed of clay minerals of the kaolinite group. The chemical composition is Al2Si2O5(OH)4. The color is often white but sometimes red, blue or brown tints from impurities. Rocks that are rich in kaolinite are known as china clay or kaolin (named after Gaoling in Jiangxi, China and was traditionally used in the production of porcelain). (Reference: http://en.wikipedia.org/wiki/Kaolin)
Kaolin is a very common mineral. Kaolin is a soft, earthy, usually white mineral, produced by the chemical conditioning of aluminum silicate mineral. Kaolin is mined in Brazil, France, Britain, Germany, India, Indonesia, Malaysia, Vietnam, Australia, Japan, PR China, and the US states of Georgia, Florida, and South Carolina. Commercial grades of kaolin are supplied and transported as dry powder, semi-dry noodle or as liquid slurry. The Niro Swirl Fluidizer™ is often used to dry the kaolin into dry kaolin powder. Another viable drying method is the GEA Barr-Rosin flash dryer with a lower initial investment. Kaolin is used in ceramics, medicine, bricks, coated paper, as a food additive, in toothpaste, as a light diffusing material in white incandescent light bulbs, and in cosmetics and as a filler in many other applications. Kaolin has even been used for spiritual and healing purposes! It is also being formulated as a spray to be applied to fruits and vegetables to prevent insect damage and infestation. The largest and most common use is in the paper industry. It is the main ingredient in creating "glossy" paper. Other materials such as calcium carbonate (which is an alternative material) competes with Kaolin as the most important source/ingredient for creating shiny paper. For additional information about the use of Kaolin and Kaolin Clay please access Wikipedia (the free web encyclopedia).

Membrane filtration: Water or solvents under high pressure is forced through a membrane, a thin material with very small pores, stopping small particles. There are four categories of membrane filtration: reverse osmosis, nanofiltration, ultrafiltration, and microfiltration. Membrane filtration is a non-absorbent treatment method.

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