Recovery of lanthanides
US4973455A · kind A · utility
2Cited by
4References
5Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 7, 1986 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Apr 7, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F15/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Lanthanide components are recovered from a fluorine-containing material by a method which comprises mixing the material with silica and sulfuric acid, heating the mixture to induce a reaction and volatilize fluorine compounds, and dissolving lanthanides from the reacted mixture with an aqueous medium. The silica is an acid-insoluble form, such as sand or diatomaceous earth. Heating should be to temperatures at least about 150.degree. C. The method is particularly useful for recovering cerium from roasted, acid-leached bastnasite flotation concentrates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.