COMPLEX METHOD FOR RECYCLING OF SLAGS Russian patent published in 2009 - IPC C22B7/04 C22B3/18 

FIELD: technological processes; metallurgy.

SUBSTANCE: invention is related to ferrous and non-ferrous metallurgy, namely to recycling of slags and ash-and-slag wastes. Method for slags recycling for extraction of valuable components includes magnetic separation and gravitational enrichment with production of concentrate and rewash discard. Rewash discard after enrichment are exposed to cavitation processing and biohydrometallurgical redistribution, which provides for additional extraction of valuable components available in slag matrix. Recycling is carried out by means of bacteria growing to concentration of 10³-10⁵ cells per 1 ml, addition of rewash discard to solution with bacteria in the ratio of T:Zh=1:5 and development of bacteria cultures to concentration of 10⁷ cells per 1 ml. In process of recycling permanent aeration is carried out at medium temperature of 15-32°C. Valuable components are extracted from produced solution.

EFFECT: higher efficiency of slag and ash-and-slag wastes recycling.

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