Method of brightening kaolin clay by thermal oxidative decarboxy

Details Method of brightening kaolin clay by thermal oxidative decarboxy Method of brightening kaolin clay by thermal oxidative decarboxy

1993-10-21

1995-03-14

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Clay containing

106486, 106488, 25218628, 25218726, 25218822, 423581, 423584, 501150, C04B 1410

Patent

active

053977548

ABSTRACT:
A method for brightening kaolin contaminated with organic matter by decarboxylation treatment of an aqueous kaolin slurry. The decarboxylation is carried out by contacting the clay slurry with selected oxidizing agent in a pressurized reaction vessel at a temperature of 175.degree.-500.degree. C. without dehydroxylation (calcination) of the kaolin. Oxidizing agents include oxygen, ozone, hydrogen peroxide, and hypochlorite.

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