METHOD FOR EXTRACTION SEPARATION OF RARE-EARTH ELEMENTS

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FIELD : technological processes. SUBSTANCE : invention relates to extraction separation of rare-earth elements from nitrate solutions. Method involves extraction of initial solution containing nitrates of rare-earth elements and salting-out agent with tributyl phosphate, washing and re-extraction with acidified water. At that, re-extraction agent relative to initial solution is divided into two flows at ratio of initial solution : first flow : second flow is equal to 1 : (0.3-0.4) : (0.5-1.0), after which first flow is evaporated to concentration of 280-320 g/l and delivered for washing out organic phase, and second flow is treated with ammonium hydroxide or ammonium carbonate and hydroxide is separated by filtration of rare-earth elements, and filtrate is delivered for preparation of initial solution. EFFECT : invention provides efficient extraction of rare-earth elements and reduced power consumption. 1 cl, 1 tbl, 3 ex