METHOD FOR EXTRACTION OF DISPERSE GOLD FROM REFRACTORY ORES AND TECHNOGENIC MINERAL RAW MATERIAL Russian patent published in 2013 - IPC C22B11/08 

FIELD: metallurgy.

SUBSTANCE: method involves agglomeration of initial raw material by adding to it of binding material, formation of a pile, leaching of gold with a reagent solution leaching the gold, collection of working solutions and extraction of gold from it. At agglomeration of raw material, to mineral mass there added is carbonate-alkaline solution containing dissolved carbon dioxide and active oxygen obtained as a result of series electrochemical and photochemical treatment of sodium solution. After that, gold is leached from agglomerated material first in a penetration-diffusion mode by supply of active concentrated solution of a leaching reagent till formation of wetting films of agglomerated material, and then, after accumulation in them of dissolved gold, in infiltration, filtration or agitation modes with oxygenated water or weak solution of leaching reagent, with repetition of a cycle till economically feasible level of extraction.

EFFECT: improved leaching efficiency.

4 cl, 1 ex