METHOD OF SEPARATING ERBIUM, SAMARIUM AND PRASEODYMIUM WITH OLEIC ACID FROM NITRATE-CHLORIDE MEDIA Russian patent published in 2016 - IPC C22B59/00 C22B3/26 

FIELD: chemistry.

SUBSTANCE: invention relates to production of rare-earth metals from low or secondary raw material at stage of separation of sum of lanthanides. Method of separating samarium and erbium, praseodymium from nitrate-chloride solutions involves contact of extractant and solution, mixing, settling and separation of phases, use of oleic acid as extractant in inert diluent. At that, extraction is carried out in three stages with transfer of Erbium at first stage in organic phase, samarium at second and praseodymium at third stage. Volume fraction of oleic acid ranges from 13-15 %. Kerosene is used as said inert latent solvent. Extraction is carried out at pH from 3 to 5, extragent and aqueous solution 1:10, potassium or sodium chloride content of 0.001-0.014 mol/l.

EFFECT: technical result is sufficiently high rates of extraction and separation of said metals with low consumption of extragent, which enables to improve technological parameters of process.

1 cl, 3 dwg, 1 ex