METHOD OF GOLD-BEARING SULFIDE CONCENTRATES BACTERIAL OXIDATION AT RECEIVING OF GOLD Russian patent published in 2009 - IPC C22B11/00 C22B3/18 

FIELD: metallurgy.

SUBSTANCE: invention concerns method of gold-bearing sulfide concentrates bacterial oxidation by hydrometallurgy method at gold receiving with usage of microorganisms. Method includes three-stage oxidation of concentrate by means of microorganisms' aggregation at speed of pulp passage, not exceeding reproduction rate of microorganisms' aggregation. Into concentrate it is added sulfuric acid in amount not more than 1:100 at chemical ratio of iron and arsenic (Fe/As) less than 2.9, from 1:100 till 2:100 at ratio Fe/As from 3.4 till 3.5, from 2:100 till 3:100 at ratio Fe/As from 3.6 till 3.9. At that not less than 70% of sulfuric acid of its total amount is added to sulfide concentrate at stage of preliminary preparation and not more than 30% of sulfuric acid - at the first stage of oxidation.

EFFECT: increasing of sulfides oxidation rate and expansion of manufacturing capabilities of the method.

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