Purification of ammonium tungstate solutions
US4346061A · kind A · utility
6Cited by
7References
9Claims
0Family size
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Key dates
| Filing date | Mar 31, 1981 |
| Grant date | Aug 24, 1982 |
| Priority date | — |
| Expiry date | Mar 31, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Prior to evaporative crystallization of ammonium tungstate solutions to give ammonium paratungstate (APT), an aluminum compound, e.g. aluminum sulfate solution, is added to precipitate silicon and phosphorus impurities. The yield of crystallized ammonium paratungstate is thereby increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.