Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Radioactive metal
Patent
1979-11-23
1982-02-23
Kyle, Deborah L.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Radioactive metal
2605024A, C01G 4300, C01B 25238
Patent
active
043168779
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.
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Greek et al., "Uranium Recovery from Wet Process Phospheric Acid" Ind. and Eng. Chem., vol. 49, p. 628 (1957).
Kabachnik et al., "Organophosphorus Complexones" Russian Chem. Reviews, 43(9) (1974) p. 733.
Kabachnik et al., "Complex Forming Properties of HEDPA in Aqueous Soln." Proc. Acad. Sci. USSR 177 p. 582 (1967).
Largman Theodore
Sifniades Stylianos
Tunick Allen A.
Allied Corporation
Doernberg Alan M.
Fuchs Gerhard H,.
Kyle Deborah L.
Stewart, II Richard C.
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