Abstract
The conventional cyanide leaching process is used to extract gold from a high copper gold concentrate. Because the copper associated minerals consume sodium cyanide in large quantities, the cost of the reagents is high and the economic benefit is not ideal. At the same time, a large number of cyanide tail slag are produced, which brings a series of environmental problems. In order to solve the environmental problems caused by excessive sodium cyanide consumption and cyanogen slag, the feasibility of leaching gold by thiosulfate in copper ammonia system was studied. The gold leaching rate of thiosulfate was increased to more than 90% by using the direct thiosulfate leaching process and pretreatment thiosulfate leaching process, which was close to the gold leaching index of sodium cyanide at the production site.
Highlights
Cyanidation is widely used in gold dressing and metallurgy because of its simple operation and high recovery
Thiosulfate method has the advantages of fast gold leaching speed, non-toxic, insensitive to impurities and no corrosion to equipment[2]
Because the copper content is more than 3%, a large amount of cyanide is consumed in the process of cyanide leaching, resulting in high cost of reagent and poor economic benefit
Summary
Cyanidation is widely used in gold dressing and metallurgy because of its simple operation and high recovery. A large number of non cyanide gold extraction technologies such as thiourea process, thiosulfate process, halogen process, polysulfide process and stone sulfur mixture process have been reported. For refractory gold ores containing as, Cu and carbon, the recovery effect of gold is obviously better than that of cyanide[3]. The conventional cyanidation leaching process was used to extract gold from a high copper gold concentrate, resulting in a large amount of cyanidation tailings, which caused serious environmental problems. Because the copper content is more than 3%, a large amount of cyanide is consumed in the process of cyanide leaching, resulting in high cost of reagent and poor economic benefit. Based on the analysis of the properties of the ore, the feasibility of leaching gold with thiosulfate in copper ammonia system was explored
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