METHOD OF EXTRACTING VANADIUM FROM SPENT CATALYSTS Russian patent published in 2025 - IPC C22B34/22 B01J23/92 B01J38/48 C22B3/06 C22B3/24 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of processing vanadium-containing catalysts by hydrometallurgical methods. Method involves annealing the catalyst at temperature of 400-500 °C, its grinding and acid leaching. Obtained solution is subjected to sorption purification from phosphorus and silicon impurities with a strongly basic resin with quaternary amine functional groups at pH 1.1-1.5. Further, molybdenum is sorbed by a weakly basic resin with tertiary amine functional groups at pH 1.1-1.5. Then the pH of the solution is adjusted to 3.0-3.5 by adding a NaOH solution. Vanadium is sorbed from the obtained solution by a strongly basic anion-exchange resin with trimethylammonium functional groups. Duration of contact of solutions with resins is not less than 50 minutes. Further, vanadium and molybdenum are desorbed. To obtain molybdenum oxide, the ammonia eluate is evaporated, crystallized and the obtained ammonium paramolybdate is calcined. To obtain vanadium oxide, concentrated sulphuric acid is added to an alkaline eluate to pH 2.0, the obtained tungstic acid is washed with weak 3-5% solution of hydrochloric acid and calcined.

EFFECT: higher purity and degree of extraction of vanadium oxide from spent catalyst.

1 cl, 1 tbl, 2 ex