锌冶炼中浸渣低酸浸出铟实验研究OA

Under the background of"dual carbon"goals,resource utilization of solid waste residues in non-ferrous metal smelting processes holds significant importance for achieving green and low-carbon development in the industry.The neutral leach residue from zinc hydrometallurgy contains multiple valuable metals,among which efficient recovery of indium is particularly critical.To address the issue of low indium leaching efficiency under conventional atmospheric pressure and low-acid conditions,this study systematically investigated the effects of acidity,reaction time,oxidative atmosphere,and reducing environment on indium leaching behavior using an atmospheric sulfuric acid leaching process with zinc smelting residue as the research object.Results indicate that under low-acid leaching conditions,indium leaching rate increases with elevated sulfuric acid concentration and prolonged reaction time.However,excessive oxidative atmosphere or extended reaction duration leads to a decrease in indium extraction efficiency.Under optimized conditions(85 g/L sulfuric acid concentration,liquid-to-solid ratio of 4∶1,leaching temperature of 85℃,reaction time of 5.5 hours,and 5 g/L zinc concentrate addition),the indium leaching rate reaches 60.87%.This study provides a feasible technological basis for recovering indium from zinc smelting residue under atmospheric pressure and low-acid conditions.