Sustainable Mining and Metallurgy

In this paper, leaching experiments were carried out on the smelting slag produced by the process of treating anode slime produced by gold-copper smelting in Kaldo furnace by using environmentally friendly cyanide-free reagents, and the effects of grinding fineness, liquid-solid ratio, regent concentration and leaching time on the of gold and silver were investigated. The test results show that the leaching rates of gold and silver can reach 95.60% and 88.79% respectively under the conditions of grinding fineness of -0.023μm (600 mesh) accounting for about 90%, liquid-solid ratio of 2∶1, environmentally friendly cyanide-free reagent concentration of 1.2% and leaching time of 24h. For the leaching solution containing gold and silver, the content of gold and silver in the solution can be reduced to 0.1g/m3 and 1.2g/m3 respectively by zinc powder replacement, and the recovery effect of gold and silver is good. The above results show that it is feasible to leach gold and silver from Kaldo slag by non-cyanide environmental protection agent. This process is environmentally friendly and has high recovery rate of gold and silver.