METHOD FOR ISOLATING AMERICIUM FROM LIQUID RADIOACTIVE WASTE AND FOR SEPARATING AMERICIUM FROM RARE EARTH ELEMENTS

摘要

The proposed invention relates to processes for extracting and concentrating radionuclides and can be used in radiochemical technologies when treating liquid radioactive waste. The method for isolating americium from liquid radioactive waste and for separating americium from rare earth elements involves joint extraction of americium and rare earth elements from a nitric acid radioactive solution by means of a solution of a neutral organic extraction agent in a polar fluoroorganic solvent; washing of an organic phase saturated with metals; and selective re-extraction of americium, wherein N,N,N',N'-tetraalkylamide of diglycolic acid is used as the extraction agent, and a solution having a composition of 5-20 g/l complexon, 5-60 g/l nitrogen-containing organic acid and 60-240 g/l salting-out agent is used as the solution for re-extraction of americium. The technical result is the isolation of americium from liquid acid radioactive solutions and the separation of americium from all the rare earth elements in a single extraction cycle.