METHOD OF EXTRACTING RARE EARTH ELEMENTS FROM EXTRACTION PHOSPHORIC ACID Russian patent published in 2014 - IPC C22B59/00 C22B3/24 C01F17/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of extracting a concentrate of rare earth elements (REE) from extraction phosphoric acid. Extraction phosphoric acid with the concentration of 27-45 wt %, which contains REE and thorium, is passed through sulphoxy cationite with formation of a REE-depleted thorium-containing phosphate solution and cationite, saturated with REE. In the process of passing phosphoric acid through sulphixy cationite thorium concentration in the REE-depleted phosphate solution, which twice becomes equal to its concentration in initial phosphoric acid, is fixed. When the concentration of thorium in the REE-depleted solution for the second time becomes equal to its concentration in initial phosphoric acid, cationite is considered to be REE-saturated and passing of phosphoric acid through it is stopped. Saturated cationite is washed with water. Then desorption of REE by a solution of ammonium sulphate or nitrate with the concentration of 275-300 g/l is carried out and from the obtained desorbate a non-radioactive REE concentrate is performed.

EFFECT: extraction of rare-earth elements into the concentrate.

3 cl, 1 dwg, 2 ex