Method for bleaching kaolin clay
US5342443A · kind A · utility
6Cited by
15References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1993 |
| Grant date | Aug 30, 1994 |
| Priority date | — |
| Expiry date | Apr 6, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/80
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An improved method for improving the brightness of clay of the type that is capable of being bleached by an oxidative reagent such as Georgia gray kaolin. Such clay, in the form of a dispersed slurry, is treated with a combination of sodium silicate, sodium hypochlorite and ozone, most preferably followed by magnetic purification and a reduction bleach. Sodium hypochlorite is added shortly before ozonation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.