METHOD OF EXTRACTING TUNGSTEN (VI) AND/OR MOLYBDENUM (VI) IONS FROM AQUEOUS SULPHATE SOLUTIONS Russian patent published in 2010 - IPC C22B34/30 C22B3/26 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of extracting tungsten (VI) or molybdenum (VI) ions or tungsten (VI) and molybdenum (VI) ions together or separately from aqueous sulphate solutions when they are simultaneously present in the solution using an organic reagent. The organic reagent used is N',N'-dialkylhydrazides of 2-ethylehexane acid of general formula {(H₂L)⁺ _nSO₄ ^2-} (I), where (H₂L)⁺ - C₄H₉CH(C₂H₅)CONHN(C₅H₁₁)₂, C₄H₉CH(C₂H₅)CONHN(C₇H₁₅)₂ or C₄H₉CH(C₂H₅)CONHN(C₄H₉CH(C₂H₅)CH₂)₂. Extraction of tungsten (VI) ions is carried out in an acidic medium with pH 3 and sulphuric acid concentration of 8 mol/l. Extraction of molybdenum (VI) ions takes is carried out in an acidic medium with pH 1.8-3.5. Combined extraction of tungsten (VI) and molybdenum (VI) ions when they are simultaneously present in the solution is carried out in acidic medium with pH 1.8 and sulphuric acid concentration of 0.5 mol/l. Separate extraction of tungsten (VI) and molybdenum (VI) ions when they are simultaneously present in the solution is carried out with sulphuric acid concentration of 4-6 mol/l.

EFFECT: possibility of using a single-component reagent during extraction.

5 cl, 2 dwg, 1 tbl, 4 ex