Process for the recovery of uranium contained in an impure phosp

Details Process for the recovery of uranium contained in an impure phosp Process for the recovery of uranium contained in an impure phosp

1980-02-28

1983-02-01

Miller, Edward A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

204 15, 423 8, 423 9, C01G 4300

Patent

active

043715052

ABSTRACT:
The invention concerns a process for the recovery of the uranium contained in an impure phosphoric acid. The impure acid is treated with an organic phase capable of extracting U (VI), and the resultant organic phase is then re-extracted with an aqueous solution containing complexing acid and an oxidizing-reducing agent in the reduced state, said oxidizing-reducing agent being capable of reducing U.sup.+6 to U.sup.+4 in said aqueous solution. The resultant aqueous phase is then subjected to electrochemical oxidation, followed by extraction with a second organic phase from which the uranium is recovered, the depleted aqueous solution being recycled to the re-extraction after electrochemical reduction, with the process comprising two organic phase cycles and a cycle of a complexing aqueous solution.
The process is of particular interest when applied to the recovery and concentration of uranium contained in a wet process phosphoric acid.

REFERENCES:
patent: 3616276 (1971-10-01), Schneider et al.
patent: 3711591 (1973-01-01), Hurst et al.
patent: 3737513 (1973-06-01), Wiewiorowski et al.
patent: 3770612 (1973-11-01), Gray et al.
patent: 3966872 (1976-06-01), Sundar et al.
patent: 4021313 (1977-05-01), Hausberger et al.
patent: 4105741 (1978-08-01), Wiewiorowski et al.
patent: 4234393 (1980-11-01), Hepworth et al.
patent: 4279705 (1981-07-01), Riggs
Merritt, "The Extractive Metallurgy of Uranium", pp. 237-239, Colorado School of Mines Research Institute (1971).

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