METHOD FOR HYDROMETALLURGICAL REPROCESSING OF SULFIDE CONCENTRATES Russian patent published in 2008 - IPC C22B3/06 

FIELD: metallurgy.

SUBSTANCE: invention concerns hydrometallurgy and ore benefication, extraction of nonferrous, less-common and noble metals from sulfide minerals, reprocessing of ore, concentrates and withdrawals of ore-dressing and metallurgical manufacturing, including concentrates, middlings, tails, slags, sludges and others. Technical effect of current invention is increasing of metals extraction from concentrates, decreasing of leaching time, decreasing of energy consumption used for leaching. Method of hydrometallurgical reprocessing of sulfide concentrates includes initial regrinding of concentrate in ball mill till size 60÷100% minus 0.044 mm at ratio of solid and liquid phases equal to 1:1÷2. Regrinding is being implemented during 4÷15 minutes. Then it is implemented leaching at solid phase content 9÷30 wt % in water solution of inorganic acid by concentration from 2.0÷150.0 g/dm³ at presence of ferric iron ions by concentration 3÷20 g/dm³ with usage of harmless compounds, containing active oxygen. Extraction of metals is implemented from leaching products.

EFFECT: increasing of metals extraction from concentrates, reduction of leaching time, decreasing of power consumption for leaching.

10 cl, 3 ex