METHOD FOR LEACHING GOLD FROM TAILINGS OF GRAVITY CONCENTRATION OF REFRACTORY GOLD ORES Russian patent published in 2023 - IPC C22B11/00 C22B3/06 

FIELD: mining industry; environmental protection.

SUBSTANCE: invention can be used for processing refractory gold ores and technogenic raw materials. The method for leaching gold from tailings of gravity concentration of refractory gold-bearing ores includes the stages of ore crushing, classification, gravity concentration and leaching. At the classification stage, crushed ore smaller than 2 mm is classified into size classes -2+1 mm, -1+0.5 mm, -0.5+0.2 mm, -0.2+0 mm. The material of each size class is subjected to gravitational enrichment on a concentration table with the separation of gravity-sized gold into a concentrate, and the gravitational enrichment tailings are subjected to preliminary mechanochemical activation at a laboratory agitation apparatus in an electrophotoactivated solution based on sodium salts. Then, the electrophotoactivated solution based on sodium salts is drained and agitation leaching of the resulting mineral mass is carried out with an electrophotoactivated hypochlorite-chloride solution.

EFFECT: degree of extraction of gold from the tailings of gravity enrichment is increasing and the ecological burden on the environment is reduced.

1 cl, 1 dwg, 1 tbl