Extraction of uranium values from phosphoric acid
US4316877A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1979 |
| Grant date | Feb 23, 1982 |
| Priority date | — |
| Expiry date | Nov 23, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/386
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Aqueous phosphoric acid solutions containing uranium values are contacted with an organic solution of a mixture of organophosphorus compounds produced from a carboxylic acid and PCl.sub.3 in the presence of water or from corresponding acid halides or anhydrides and phosphorous acid to extract the uranium values. The organophorus compounds generally include an alkane-1,1,2-triphosphonic acid or a 1-hydroxy-1,1-alkanediphosphonic acid or both, which differ from common organophosphorus extractants in having a carbon-phosphorus bond. The extraction has high distribution coefficients even when the phosphoric acid solution is 10 molar or more and even when the extraction is conducted at elevated temperatures such as 60.degree. C. While distribution coefficients in the presence of iron are higher for tetravalent uranium, efficient extraction can be conducted of hexavalent uranium as well. Uranium values are recovered from the organic solution by contacting it with about 40-70 weight percent aqueous HF and separating a uranium-rich precipitate from the solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.