COMPLETE EXTRACTION OF DIFFICULT GOLD FROM TECHNOGENICALLY TRANSFORMED MINERAL RAW MATERIALS USING ACTIVATION HEAP LEACHING

Abstract

We have proposed several physico-chemical schemes of leaching processes which allow to evaluate different technological approaches to extraction of dispersed forms of gold from technogenically transformed mineral raw materials. Laboratory studies were carried out on samples of copperporphyry gold-bearing ores of the oxidation zone of the Malmyzh deposit of Khabarovsk Krai. The paper describes different models of leaching with preliminary ore preparation: preparation of peroxide-carbonate solution activated in electrochemical and photochemical reactor, followed by leaching of gold by ammonium-cyanide solution, preparation of active peroxide-sulfuric acid solutions obtained during the treatment of appropriate solutions of initial reagents in electrochemical and photochemical reactors followed by leaching of gold with cyanide solutions and chloride reagent base. And also without prior training: gold leaching with an active solution with a chloride reagent base; sodium cyanide leaching with a basic reagent content of 0.7%; sodium cyanide leaching with a basic reagent content 0.05%. Gold leaching was carried out in agitation mode on crushed ore, 60% of which was a class of 0.071 mm. Among the output technological parameters of testing were the contents in the liquid phase of pulp.