Purified attapulgite clay
US6444601B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2000 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Jun 23, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K23/34
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for producing an Attapulgite clay (Fuller's Earth) that significantly removes other types of clays and minerals, resulting in improved performance. A unique dispersant is used that will fully disperse the individual Attapulgite particles in water such that the particles remain in suspension, and allow the non-Attapulgite clay particles to be liberated, which then can be easily separated through various techniques. The Attapulgite clay may be recovered from the dispersion and dried in such a manner to produce a finely sized powder from ore, without the need for any grinding or milling operation. The dried Attapulgite clay has a free moisture content of 2-3%. The dried Attapulgite clay with adsorbed dispersant is redispersed in water and retains thixotropic properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.