Method for purifying diatomaceous earth
US8883860B2 · kind B2 · utility
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25Claims
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Key dates
| Filing date | Oct 12, 2011 |
| Grant date | Nov 11, 2014 |
| Priority date | — |
| Expiry date | Oct 12, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B33/12
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A method for purifying diatomaceous earth, whose natural colloidal structure is retained, which includes preparing a suspension of diatomaceous earth in a liquid wherein diatomaceous earth is insoluble, separating diatomaceous earth from the suspension, treating diatomaceous earth with an inorganic or organic acid, heat-treating the thus obtained product at a temperature not higher than 300° C., subjecting the product obtained to oxidative treatment and drying the purified product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.