USE OF NOVEL COMPOUNDS FOR SELECTIVE EXTRACTION OF RARE-EARTH METALS FROM AQUEOUS SOLUTIONS CONTAINING PHOSPHORIC ACID AND CORRESPONDING EXTRACTION METHOD Russian patent published in 2020 - IPC C22B3/26 C22B59/00 

FIELD: chemistry.

SUBSTANCE: invention relates to extraction of rare-earth metals (REM) from aqueous phases containing corresponding rare-earth metals, and can be used in processing of natural ores and/or industrial wastes for re-use of rare-earth metals in their composition. As extracting agent for extraction of REM from aqueous phase containing phosphoric acid, compound of formula (I) is used:

,

where n is an integer equal to 0, 1 or 2, R₁ and R₂ are H or an aliphatic hydrocarbon group, one of R₃ and R₄ has formula (II) shown below:

,

where R₅ and R₆ represent a hydrogen atom, a hydroxyl or alkoxy group, and the remaining of R₃ and R₄ has one of the following formulas (II') and (III):

,

where R_5' and R_6' represent a hydrogen atom, a hydroxyl or alkoxy group, and R₇ and R₈ represent H or an aliphatic hydrocarbon group.

EFFECT: use of the compound enables to achieve selectivity and improved extraction characteristics.

20 cl, 24 tbl, 15 ex