METHOD OF EXTRACTING RARE-EARTH METALS YTTRIUM (III), CERIUM (III) AND ERBIUM (III) FROM WATER SOLUTIONS Russian patent published in 2012 - IPC C22B59/00 C22B3/26 

FIELD: metallurgy.

SUBSTANCE: proposed method comprises contact of extragent containing rapic acid and inert latent solvent with water solution, mixing obtained mix, settling and phase separation. Kerosene is used as said inert latent solvent. Extraction is performed for 10-15 min in two steps at pH=4.5-5.5 and extragent-to-water solution ratio of 1:10. In first step, extraction is carried out at content of rapic acid in extragent of 5-7 vol. % with separation of cerium (III) and mix of yttrium (III) and erbium (III). In second step, extraction is carried out at content of rapic acid in extragent of 15-17 vol. % with separation of yttrium (III) and erbium (III).

EFFECT: higher efficiency of extraction and separation.

4 dwg