Process for recovering cobalt and tungsten from reaction liquors
US5599514A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1995 |
| Grant date | Feb 4, 1997 |
| Priority date | — |
| Expiry date | Feb 6, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Process for recovering and re-using cobalt and tungsten from reaction liquors, in which said reaction liquors are treated: PA0 a) With an alkali-earth metal hydroxide in order to precipitate cobalt and tungsten, and the resulting precipitate is subsequently treated with a strong mineral acid in order to be able to dissolve the cobalt salt and separate it from H.sub.2 WO.sub.4 precipitate; or PA0 b) With an alkali metal hydroxide in order to precipitate and separate Co(OH).sub.2, and the resulting alkaline solution is then treated with an alkali-earth metal compound which is filtered and treated with a strong mineral acid in order to obtain H.sub.2 WO.sub.4
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.