METHOD OF EXTRACTING AMERICIUM FROM LIQUID RADIOACTIVE WASTES AND SEPARATION OF RARE-EARTH ELEMENTS

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FIELD : chemistry. SUBSTANCE : invention relates to a method of extracting americium from liquid radioactive wastes to separate it from rare-earth metals. Method includes combined extraction of americium and rare-earth metals from nitrate radioactive solution with solution of neutral organic extractant in a polar fluororganic solvent, washing metal-saturated organic phase, selective re-extraction of americium. Extraction agent used is N, N, N′, N′-tetraalkylamide diglycolic acid, solution for re-extraction of americium is a composition of 5-20 g/l complexon, 5-60 g/l of nitrogen-containing organic acid and 60-240 g/l salting-out agent. EFFECT : technical result consists in extraction of americium from acidic liquid radioactive solutions and its separation from all rare-earth metals in one extraction cycle. 5 cl, 34 tbl, 17 ex