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Removal of dissolved actinides from alkaline solutions by the method of appearing reagents

United States Patent

5,640,668
June 17, 1997
View the Complete Patent at the US Patent & Trademark Office
A method of reducing the concentration of neptunium and plutonium from alkaline radwastes containing plutonium and neptunium values along with other transuranic values produced during the course of plutonium production. The OH.sup.- concentration of the alkaline radwaste is adjusted to between about 0.1M and about 4M. [UO.sub.2 (O.sub.2).sub.3 ].sup.4- ion is added to the radwastes in the presence of catalytic amounts of Cu.sup.+2, Co.sup.+2 or Fe.sup.+2 with heating to a temperature in excess of about 60.degree. C. or 85.degree. C., depending on the catalyst, to coprecipitate plutonium and neptunium from the radwaste. Thereafter, the coprecipitate is separated from the alkaline radwaste.
Krot; Nikolai N. (Moscow, RU), Charushnikova; Iraida A. (Moscow, RU)
08/ 618,922
March 20, 1996
CONTRACTUAL ORIGIN OF THE INVENTION The United States Government has rights in this invention pursuant to the Peaceful Uses of Atomic Energy Agreement and the Memorandum of Understanding between the United States Department of Energy and the Russian Federation of Atomic Energy for Cooperative Research on Waste Management and Environmental Remediation.