METHOD OF SEPARATING SAMARIUM, EUROPIUM AND GADOLINIUM Russian patent published in 2024 - IPC C01F17/10 C01F17/17 C22B59/00 C22B3/26 B01D11/04 

FIELD: separation.

SUBSTANCE: invention relates to the technology of separation of rare-earth elements of the middle group, which include samarium, europium, gadolinium, terbium and partially dysprosium. Method of separating samarium, europium and gadolinium from a concentrate containing impurities of lighter rare-earth elements and heavier ones—terbium, dysprosium, includes steps of extraction, washing and re-extraction of rare-earth elements with organophosphorus acid with separation of gadolinium from europium at the first cascade and samarium from europium at the second cascade, with subsequent extraction of europium by reduction. Gadolinium re-extraction at the first cascade is carried out in two stages, leaving terbium and dysprosium impurities in the organic phase at the first stage. These impurities are re-extracted at the second stage and removed from the process. First re-extract containing gadolinium is completely returned to the cascade as a washing solution with accumulation of gadolinium in the connected vessel. When extracting samarium in the second cascade in the first stages of the extraction part of the cascade, neutralizing the mineral acid with complete extraction of samarium into the organic phase, which is accumulated in a vessel connected to the cells in the middle of the extraction part of the cascade. Impurities of lighter rare-earth elements remaining in the aqueous phase are removed from the process with the raffinate.

EFFECT: method increases quality of extracted products.

3 cl, 2 dwg, 2 tbl, 1 ex