Method of detoxifying asbestos contained in waste slate and detoxified asbestos obtained through the same
US9446273B2 · kind B2 · utility
1Cited by
4References
6Claims
0Family size
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Key dates
| Filing date | Jun 19, 2014 |
| Grant date | Sep 20, 2016 |
| Priority date | — |
| Expiry date | Jul 1, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB09B2101/35
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Disclosed is a method of detoxifying asbestos of waste slate. The method includes concentrating the asbestos by introducing hydrochloric acid aqueous solution into waste slate powder to dissolve and remove a limestone component contained in the waste slate; and mixing the concentrated asbestos with oxalic acid and performing a low-temperature heat treatment. The waste slate is crushed and pulverized and powder of the crushed and pulverized waste slate is formed in a size in a range of 100 meshes to 300 meshes. The detoxified asbestos includes re-crystallized magnesium oxalate having a rhombohedral or amorphous shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.