The United States of America As Represented by the Department of Energy

Japan Nuclear Cycle Development Institute

Vasily Alexandrovich Babain

Terry Allen Todd

Jack D Law

Masaki Ozawa

Igor V Smirnov

Valeriy Nicholiavich Romanovskiy

R Scott Herbst

Igor Valentinovich Smirnov

Vyatcheslav M Esimantovski

Boris Yakovlevich Zilberman

Yury Stepanovich Fedorov

Andey Yurievich Shadrin

Valery Nikolaevich Romanovsky

A new method to strip metals from organic solvents in a manner that allows for the recycle of the stripping agent. The method utilizes carbonate solutions of organic amines with complexants, in low concentrations, to strip metals from organic solvents. The method allows for the distillation and reuse of organic amines. The concentrated metal/complexant fraction from distillation is more amenable to immobilization than solutions resulting from current practice.

Method of stripping metals from organic solvents

Extraction mixture capable of recovering actinide elements such as U, Pu and transplutonium elements from radioactive liquid waste in reprocessing of spent nuclear fuel. One embodiment of the extraction mixture includes a solution of bidentate organophosphorus extractant, dihexyl-N, N-diethylcarbamoyl phosphonate in a polar diluent, wherein bis-tetrafluoropropyl ether of diethylene glycol is used as the polar diluent at the following ratio of components: 0.1-1.2 M/L of bidentate extractant and the rest of diluent. Another embodiment of the extraction mixture includes a solution of bidentate organophosphorus extractant, phenyloctyl-N,N-diisobutylcarbamoylphosphine oxide in a polar diluent, wherein a mixture of metanitrobenzotrifluoride with trialkylphosphate is used as the polar diluent at the following ratio of components: 0.1-1.2 M/L of bidentate extractant, 0.3-1.1 M/L of TBP, and the rest of MNBTF.

Extraction mixture for recovery of actinide elements from acidic solutions

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St.-Petersburg, Russia

Vasily Alexandrovich Babain