Method for removing tin from sodium tungstate solution
US4552729A · kind A · utility
1Cited by
4References
5Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 7, 1984 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | Dec 7, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01G19/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method is disclosed for removing tin from aqueous sodium tungstate solutions. The method involves adding ammonia to the sodium tungstate solution, adjusting the pH to above about 9.5 with an acid, adding magnesium chloride to form insoluble material containing the major portion of the tin, silicon, arsenic and phosphorus and a resulting sodium tungstate solution containing the major portion of the tungsten, and separating the insoluble material from the resulting solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.