Method for precipitating vanadium from vanadium bearing liquors and recovering vanadium pentoxide
US4548792A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1984 |
| Grant date | Oct 22, 1985 |
| Priority date | — |
| Expiry date | Mar 15, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01G31/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for precipitating vanadium from vanadium bearing liquors comprises adjusting the pH of the vanadium bearing liquor with a precipitating agent selected from the hydroxides of Na, K and Ca to a range of about 5.5 to 6.5, preferably 6.0 to 6.2 so as to precipitate vanadium in the trivalent and tetravalent states. Remaining traces of vanadium are then cemented by additions of calcium hydroxide, calcium oxide or mixtures thereof. The dried precipitate is then heated in the presence of air and Na and/or K so as to form a reaction product in the form of a water soluble salt which, when dissolved in water, results in vanadium in its pentavalent state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.