Method of brightening kaolin clay by thermal oxidative decarboxylation of organic contaminants
US5397754A · kind A · utility
8Cited by
23References
10Claims
0Family size
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Key dates
| Filing date | Oct 21, 1993 |
| Grant date | Mar 14, 1995 |
| Priority date | — |
| Expiry date | Oct 21, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/60
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.