Bidentate organophosphorus solvent extraction process for...

Details Bidentate organophosphorus solvent extraction process for... Bidentate organophosphorus solvent extraction process for...

C - Chemistry, Metallurgy

22

B

53/218

C22B 60/00 (2006.01) C22B 60/02 (2006.01) C22B 60/04 (2006.01)

Patent

CA 1072341

ABSTRACT OF THE DISCLOSURE A liquid-liquid extraction process for the recovery and partitioning of actinide values from acidic nuclear waste aqueous solutions, the actinide values including trivalent, tetravalent and hexavalent oxidation states is provided and includes the steps of contacting the aqueous solution with a bidentate organophosphorus extractant to extract essentially all of the actinide values into the organic phase. Thereafter the respective actinide fractions are selectively partitioned into separate aqueous solutions by contact with dilute nitric or nitric-hydrofluoric acid solutions. The hexavalent uranium is finally removed from the organic phase by contact with a dilute sodium carbonate solution.

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