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

British Nuclear Fuels Plc

Igor V Smirnov

Terry Allen Todd

Valeriy Nicholiavich Romanovskiy

Ken N Brewer

Vasiliy A Babain

Jack D Law

Neil Graham Smart

R Scott Herbst

Vasily Alexandrovich Babain

Andrey A Murzin

Vassily A Babain

Andrey Y Shadrin

Vyatcheslav M Esimantovski

Vadim A Starchenko

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

Metal ions are removed from solid surfaces which may be contaminated with one or more radionuclides by contacting the solid surfaces with the supercritical fluid, as, for instance, carbon dioxide containing both an acidic ligand and organic amine. The metal ions are extracted from the solid surface and the extract is separated from the solid surface.

Method for removing inorganic matter from solid surfaces

The present invention relates to solvents, and methods, for selectively extracting and recovering radionuclides, especially cesium and strontium, rare earths and actinides from liquid radioactive wastes. More specifically, the invention relates to extracting agent solvent compositions comprising complex organoboron compounds, substituted polyethylene glycols, and neutral organophosphorus compounds in a diluent. The preferred solvent comprises a chlorinated cobalt dicarbollide, diphenyl-dibutylmethylenecarbamoylphosphine oxide, PEG-400, and a diluent of phenylpolyfluoroalkyl sulfone. The invention also provides a method of using the invention extracting agents to recover cesium, strontium, rare earths and actinides from liquid radioactive waste.

Solvent for the simultaneous recovery of radionuclides from liquid radioactive wastes

Method for the simultaneous recovery of radionuclides from liquid radioactive wastes using a solvent

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St. Petersburg, Russia

Igor V Smirnov