Process for the treatment of alkaline liquors containing sulfate ions
US4321235A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1978 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | Feb 8, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Alkaline solutions containing sulfate and sodium ions such as uranium leach liquors, are treated with cationic ion exchange resins in the ammonium form to form a solution containing soluble ammonium salts and complexes; the solution is further treated to convert the soluble sulfates into insoluble sulfates and, in the case of uranium, further treating to separate the uranium by heat and/or acidification. The ammonium can be recovered and reused as ammonium carbonate to regenerate the ion exchange resin whereby sodium ions are eluted from the resin in the form of sodium carbonate which is converted to sodium hydroxide and re-cycled for use as leaching solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.