Sustainable Mining and Metallurgy

Lead anode mud was an intermediate product obtained by crude lead electrolytic refining, which contained a large number of valued accessory elements that can be further extracted, such as gold, silver, lead and other elements. Based on the actual production, the wet pretreatment process of lead anode slime was studied in this paper. The lead anode slime was oxidized by hydrogen peroxide, and the optimum oxidation prepreg conditions were determined. The results showed that under the conditions of hydrogen peroxide dosage of 40g, hydrochloric acid concentration of 4.5mol/L, liquid-solid ratio of 6∶1, leaching time of 3h, and leaching temperature of 80℃, the oxidation pre-leaching effect of lead anode slime was good, the leaching rate of Bi and Sb could reach more than 98%, and the leaching rate of As and Cu reached more than 90%, the concentration of Au in leaching solution below 0.1mg/L, the leaching concentration of Ag was less than 30mg/L, and the slag rate was reduced to less than 25%. The process was simple and low cost, which provided a new way for the treatment of lead anode mud.