METHOD FOR GOLD EXTRACTION FROM ORES Russian patent published in 2008 - IPC C22B11/08 B03B7/00 

FIELD: processes for extracting gold from ores.

SUBSTANCE: method comprises steps of breaking ore, double-stage disintegration of it, sorting, gravitation and flotation con centration, sorption leaching, electrolytic extraction of gold and melting it. At cycles of primary and secondary disintegration of initial ore hydraulic sorting is performed for producing sand fraction of ore and drain. Then sand fraction is divided by flow for gravitation concentration and flow for secondary disintegration. Divided flow of sand fraction is fed for gravitation concentration in quantity determined according to given formula: γ gr.f. = (0.3 - 0.4)γ in.ore + (0.2 - 0.6)γ circ.load where γ gr.f - mass of sand fraction of disintegrated ore fed for gravitational concentration; γin.ore - mass of initial ore fed for primary disintegration; γ circ.load - mass of circulation load for secondary disintegration. Gravitational concentration of drain and divided flow of sand fraction are realized for producing separate gravitation concentrates and separate tails. Then gravitation concentrates of drain and divided flow of sand fraction are combined and after their combination they are divided by "gold head" concentrate and depleted gravitation concentrate. The last is subjected to intensified cyaniding for producing solid phase and gold- containing solution. Tails of gravitation concentration of drain of sorting are subjected to flotation and prepared flotation concentrate is combined with solid phase of intensified cyaniding to be subjected to sorption leaching and desorption for producing gold-containing solution. Then separate electrolytic deposition of gold from gold-containing solutions of intensified cyaniding and sorption leaching is performed for producing separate cathode deposits of gold. Produced " gold head" and cathode deposits of gold are subjected to calcining and melting for producing gold in ingots.

EFFECT: lowered losses, increased degree of gold extraction, reduced circulation load and therefore improved efficiency of gold extraction.

1 dwg