METHOD OF PURIFYING WORKING LEACHING SOLUTIONS FROM PHOSPHATES AND FLUORIDES Russian patent published in 2015 - IPC C02F1/26 C02F1/58 C02F1/52 B01D11/04 B01D21/01 

FIELD: chemistry.

SUBSTANCE: invention relates to method of purifying acidic salt solutions, in particular, those that are formed in complex processing of apatite with obtaining rare-earth metals concentrate (REM), from admixtures of phosphorus, fluorine and alkali metals. Method includes sedimentation of phosphorus, fluorine in form of phosphates and fluorides of calcium, and alkali metals in form of siliconfluorides, and before sedimentation of phosphates and fluorides of calcium and siliconfluorides of alkali metals acid is simultaneously with REM selectively extracted into organic extragent, with re-extraction of valuable component from organic extract, and after sedimentation of phosphates and fluorides of calcium and siliconfluorides of alkali metals acid is re-extracted from extract into water solution.

EFFECT: claimed method makes it possible to eliminate admixtures of phosphorus, fluoride and alkali metals, extract REM without loss and regenerate acid.

4 cl, 1 dwg, 4 ex