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Extraction processes and solvents for recovery of cesium, strontium, rare earth elements, technetium and actinides from liquid radioactive waste

United States Patent

August 7, 2001
View the Complete Patent at the US Patent & Trademark Office
Idaho National Laboratory - Visit the Technology Transfer and Commercialization Office Website
Cesium and strontium are extracted from aqueous acidic radioactive waste containing rare earth elements, technetium and actinides, by contacting the waste with a composition of a complex organoboron compound and polyethylene glycol in an organofluorine diluent mixture. In a preferred embodiment the complex organoboron compound is chlorinated cobalt dicarbollide, the polyethylene glycol has the formula RC.sub.6 H.sub.4 (OCH.sub.2 CH.sub.2).sub.n OH, and the organofluorine diluent is a mixture of bis-tetrafluoropropyl ether of diethylene glycol with at least one of bis-tetrafluoropropyl ether of ethylene glycol and bis-tetrafluoropropyl formal. The rare earths, technetium and the actinides (especially uranium, plutonium and americium), are extracted from the aqueous phase using a phosphine oxide in a hydrocarbon diluent, and reextracted from the resulting organic phase into an aqueous phase by using a suitable strip reagent.
Zaitsev; Boris N. (St. Petersburg, RU), Esimantovskiy; Vyacheslav M. (St. Petersburg, RU), Lazarev; Leonard N. (St. Petersburg, RU), Dzekun; Evgeniy G. (Ozersk, RU), Romanovskiy; Valeriy N. (St. Petersburg, RU), Todd; Terry A. (Aberdeen, ID), Brewer; Ken N. (Arco, ID), Herbst; Ronald S. (Idaho Falls, ID), Law; Jack D. (Pocatello, ID)
The United States of America as represented by the United States Department of Energy (Washington, DC)
09/ 518,816
March 3, 2000
ACKNOWLEDGMENTS This invention was made with government support under Contract No. DE-AC07-94ID13223 awarded by the Department of Energy to the Lockheed Idaho Technologies Company. The U.S. Government has certain rights in the invention.