Process for extracting tungsten or molybdenum from solution
US4515756A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 9, 1980 |
| Grant date | May 7, 1985 |
| Priority date | — |
| Expiry date | Dec 9, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/14
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the recovery of molybdenum and/or tungsten from a solution which comprises the steps of passing said solution through a packed column containing an adsorbent; adsorbing tungsten and/or molybdenum on said adsorbent; passing a solution depleted in tungsten and/or molybdenum from said column; passing a stripping solution through said column containing tungsten and/or molybdenum on said adsorbent to remove tungsten and/or molybdenum with said stripping solution; repeating the first four steps until the stripping solution contains at least about 1 gram per liter of tungsten and/or molybdenum; passing said solution containing at least about 1 gram of tungsten and/or molybdenum per liter into a recovery zone; adjusting the pH of said stripping solution containing at least about 1 gram per liter of tungsten and/or molybdenum to approximately 13.0 by addition of a strong acid and thereby raising the temperature of said solution at least about 10.degree. C.; adding a calcium ion-containing solution to said pH adjusted solution to precipitate calcium tungstate and/or calcium molybdate; and, recovering said tungsten and/or molybdenum as calcium tungstate and/or calcium molybdate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.