METHOD OF THE EXTRACTION OF RARE-EARTH ELEMENTS FROM THE EXTRACTION PHOSPHORIC ACID DURING PROCESSIN

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FIELD : chemistry.SUBSTANCE : invention relates to a method of extracting rare-earth elements from phosphoric acid when processing Khibiny apatite concentrates into fertiliser. The method includes sorption using strongly acidic macroporous cationite Purolite C-150, carried out in the temperature range of 40-80°C, washing the rare-earth element-saturated sorbent with water, desorption with ammonium nitrate solution to obtain a commercial-grade strippant and further solvent refinement of the obtained strippant with 100% tributyl phosphate.EFFECT : invention improves extraction of rare-earth elements while reducing content of impurities of other elements.3 cl, 1 dwg, 7 tbl, 4 ex