METHOD OF EXTRACTING RARE-EARTH ELEMENTS FROM WET-PROCESS PHOSPHORIC ACID WHEN PROCESSING KHIBINY APATITE CONCENTRATES

摘要

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