USE OF A SYNERGETIC MIXTURE OF EXTRAGENTS FOR THE EXTRACTION OF RARE EARTH ELEMENTS FROM AQUEOUS ENVIRONMENT CONTAINING PHOSPHORIC ACID Russian patent published in 2023 - IPC C22B3/26 C22B3/40 C22B59/00 

FIELD: chemistry.

SUBSTANCE: invention relates to the use of a synergistic mixture of extractants for the extraction of at least one rare earth element from an aqueous medium containing phosphoric acid. The invention can be used in the processing of phosphate minerals to extract the rare earth elements (REE) contained in them. The said mixture contains the first extractant with the formula (I)

(I),

where R¹ and R², the same or different, represent a saturated or unsaturated, linear or branched hydrocarbon group containing from 6 to 12 carbon atoms, or a phenyl group optionally substituted with a saturated or unsaturated, linear or branched hydrocarbon group containing from 1 up to 10 carbon atoms; and a second extractant with formula (II)

(II),

where R³ represents a linear or branched alkyl group containing 6–12 carbon atoms.

EFFECT: mixture makes it possible to efficiently and selectively extract with respect to iron all rare earth elements present in an aqueous solution of phosphoric acid, even at an acid concentration of more than 4 mol/l.

14 cl, 6 dwg, 1 tbl, 3 ex