METHOD OF ISOLATION OF GADOLINIUM EXTRACTION OF ORGANOPHOSPHORUS COMPOUNDS

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FIELD : chemistry.SUBSTANCE : invention can be used in chemical industry. At the first stage of gadolinium extraction terbium, dysprosium and heavier REM are extracted from mixture of rare earth metals in organic phase. At the second stage gadolinium is extracted from obtained raffinate solution in organic phase, with main mass if europium, samarium, neodymium and other lighter REM left in water phase. gadolinium is extracted into re-extract from obtained organic phase, with all gadolinium-containing re-extract being returned to stage of washing, and the process is carried out until required content of samarium and europium in gadolinium is achieved, obtained gadolinium solution is output and the process is repeated. As extractant used are 30-40% solutions of di-2-ethylhexylphosphoric acid or bis((2, 4, 4)trimethylpentylphosphinic acid (Cyanex-272), or isododecylphosphetanic acid.EFFECT : invention ensures increased efficiency of gadolinium purification from europium.2 cl, 5 tbl