Synergistic effect of reduction leaching of manganese anode slime and oxidation pretreatment of gold concentrate

Abstract

The combined treatment process of manganese anode slime and gold concentrate was studied. The reduction leaching of manganese anode slime and the oxidative decomposition of pyrite and arsenopyrite could be realized simultaneously by the synergistic action of the two ores. The effects of time, mass ratio of two ores, concentration of sulphuric acid and temperature on the leaching rate of manganese were investigated. The optimum technological conditions were determined as follows: the leaching rate of manganese was 85.24% when the concentration of sulphuric acid was 1 mol l−1 and the ratio of two ores (Fe:Mn) was 0.5 at the temperature of 85 °C and 120 min. The extraction rate of gold from pretreated gold ore can reach 70% in the process of ultrasonic enhanced leaching. Compared with the direct leaching rate (15.6%) of the original ore, the leaching rate has been greatly improved.