METHOD OF EXTRACTING ZINC OXIDE Russian patent published in 2016 - IPC C22B19/00 C22B3/12 C22B19/34 

FIELD: metallurgy.

SUBSTANCE: invention relates to methods of separating zinc from a feedstock containing a mixture of metals and metal compounds. Method includes leaching a zinc-containing feedstock with a concentrated inorganic solution to form a suspension containing an insoluble substances and a mother solution with dissolved substances, separating insoluble substances from mother solution and precipitating zinc oxide from mother solution. Leaching is performed with a concentrated inorganic basic solution containing more than 25 wt% base containing a cation which does not form a complex with zinc, and zinc oxide is precipitated from mother solution by adding an anti-solvent to mother solution. After separation of insoluble substances from mother solution, it is cleaned to remove non-zinc substances dissolved in basic solution.

EFFECT: lower solubility of zinc oxide in basic solution and possibility to regenerate both basic solution and anti-solvent for recycling in process of hydrometallurgical processing for saving costs.

32 cl, 2 tbl, 2 dwg