ECOLOGICAL METHOD OF COMPLEX EXTRACTION OF NONFERROUS, RARE AND PRECIOUS METALS FROM ORES AND MATERIALS Russian patent published in 2009 - IPC C22B3/04 C22B11/00 C22B15/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to hydrometallurgy. Particularly it relates to method of extraction of nonferrous (Cu, Zn, Co, Ni and others), rare (U, rare earths, Y, Re, Ti, In and others) and precious (Au, Ag, Pt, Pd and others) metals from ores and materials. Method includes leaching of ores in two stages. At the first stage ore and materials treatment is implemented by the first spillage leaching solution with introduction of sulfuric acid and salts of ferric iron in amount, providing in the end of leaching in productive solution molar ratio ion concentration of ferric and ferrous iron no lower than 1:1. At the second stage ore and materials treatment is implemented by the second spillage leaching solution with introduction of sulfuric acid, thiocyanate salts and ferric iron in amount, providing in productive solution molar ratio of ion concentration of thiocyanate and ferric iron no higher than 2:1 and no lower 0.5:1, and ratio of concentration ferric and ferrous iron ions are also no lower than 1:1. Then it is implemented separate processing productive solutions of each stage by means of chemical deposition, sorption and/or electrolysis and spillage solutions return for corresponding stage.

EFFECT: increasing of extraction ratio of nonferrous, rare and precious metals.

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