Recovery of rare earth elements and compounds from coal ash
US8968688B2 · kind B2 · utility
12Cited by
1References
19Claims
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Key dates
| Filing date | Apr 17, 2013 |
| Grant date | Mar 3, 2015 |
| Priority date | — |
| Expiry date | Apr 17, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Rare earth elements are recovered from coal ash. The coal ash with rare earth elements can be treated with a mineral acid to form an aqueous mineral acid solution. The aqueous mineral acid solution can be extracted to form an organic solution that includes the rare earth salts. The organic solution can be mixed with water to form an aqueous solution that includes the rare earth salts. The rare earth elements are separated from the aqueous solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.