二氧化锰与过氧化氢联合氧化除铁技术在湿法锌冶炼中应用研究  

Study on application of manganese dioxide and hydrogen peroxide combined oxidation technology for iron removal in zinc hydrometallurgy

作　　者：刘安强[1] LIU Anqiang(Baiyin Non-ferrous Metals Co.Ltd.,Baiyin 730900,China)

机构地区：[1]白银有色集团股份有限公司,甘肃白银730900

出　　处：《中国有色冶金》2023年第3期20-25,共6页China Nonferrous Metallurgy

摘　　要：近年来,西北铅锌冶炼厂锌精矿矿源复杂多变,焙砂含残硫及亚铁较高,需加更多的锰矿粉以还原亚铁,导致系统锰离子含量上升,电解直流电单耗上升。基于此,研究提出了二氧化锰与过氧化氢联合氧化除铁技术,并采用单因素条件试验法考察溶液pH值、浸出温度、锰矿粉和H2O2按不同比例结合使用对沉矾上清溶液氧化率的影响。结果表明,最佳条件:溶液终点pH值控制在4.8~5.2,浸出温度为60~70℃,氧化槽锰矿粉加入量为理论加入量的0.6倍,氧化剂H2O2加入量为理论加入量的1.0~1.3倍,氧化率较佳,Fe2+的氧化率为92%,测得溶液锰离子为5~6 g/L。在生产中,锰含量保持在3~6 g/L,每吨锌直流电单耗可保持在3 000 kWh以下,按年产22万t阴极锌计算,可节约成本194.9万元。该技术的成功应用,对湿法炼锌指标提升起到了积极作用。In recent years,the sources of zinc concentrate in the Northwest Lead Zinc Smelter have been complex and variable,with high residual sulfur and ferrous content in the calcine,more manganese ore powder needs to be added to reduce ferrous ion,resulting in an increase in the manganese ion content of the system and an increase in the unit consumption of electrolytic current.Based on this,a combined oxidation technology of manganese dioxide and hydrogen peroxide was proposed for iron removal,and a single factor conditional test method was used to􀪇􀪇investigate the effects of solution pH,leaching temperature,and combination of oxidant manganese ore powder and H2O2 in different proportions on the oxidation rate of precipitated alum supernatant solution.The results showed that the optimal conditions were as follows:the pH value of the solution endpoint was controlled between 4.8 and 5.2,the leaching temperature was 60 to 70℃,the amount of manganese ore powder added to the oxidation tank was 0.6 times the theoretical amount,the amount of oxidant H_(2)O_(2) added was 1.0 to 1.3 times the theoretical amount,and the oxidation rate was optimal.The oxidation rate of Fe^(2+)was 92%,and the measured manganese ion in the solution was 5-6 g/L.In production,the manganese content is maintained at 3-6 g/L,and the direct current consumption per ton of zinc can be maintained below 3000kwh.Calculated based on an annual production of 220000 tons of cathode zinc,economic gain of 1.949 million yuan can be generated.The successful application of this technology has played a positive role in improving the indicators of zinc hydrometallurgy.

关 键 词：联合:湿法炼锌:氧化 二氧化锰 过氧化氢 锰离子 耗电量 阴极锌 

分 类 号：TF813[冶金工程—有色金属冶金]