湿法炼锌铜镉渣连续浸出试验研究  

Experimental Study on Continuous Leaching of Zinc-Copper-Cadmium Slag from Wet-Smelting

作　　者：杜虎忠 钱立海 张博文 尹广宇 姜红霞 DU Huzhong;QIAN Lihai;ZHANG Bowen;YIN Guangyu;JIANG Hongxia(Baiyin Nonferrous Group Co.Ltd.,Northwest Lead and Zinc Smelter,Baiyin 730900,China)

机构地区：[1]白银有色集团股份有限公司西北铅锌冶炼厂,甘肃白银730900

出　　处：《甘肃冶金》2024年第4期104-107,共4页Gansu Metallurgy

摘　　要：湿法炼锌净化过程产出的铜镉渣中含Zn 39.32%、Cu 12.82%、Cd 9.48%,综合回收价值高。目前通过一级硫酸浸出-锌粉置换回收Cu、Cd,但该处理工艺处理能力小、置换产出的粗铜品位低、浸出工艺条件难控制。通过三级连续浸出方法,在铜镉渣与电解废液及浓硫酸液固比为4∶1,流量15 L/min,浸出温度80~85℃,浸出时间3.0 h,初始pH值1.0~1.5的条件下进行连续浸出试验研究,Zn、Cd浸出率分别达到90%和88%以上,浸出渣含Cu 75%、Cd 0.6%、Zn 3.5%,铜富集效果明显。对实现源头减排,减少有毒金属镉二次污染具有重要意义。The copper and cadmium slag produced in the process of zinc hydrometallurgy purification contains 39.32%Zn,12.82%Cu and 9.48%Cd,which has high comprehensive recovery value.At present,Cu and Cd are recovered by primary sulfuric acid leaching and zinc powder replacement,but the processing capacity of this process is small,the grade of crude copper produced by replacement is low,and the leaching process conditions are difficult to control.Through the three-stage continuous leaching method,the continuous leaching experiments were carried out under the conditions that the ratio of copper and cadmium slag to electrolytic waste liquid and concentrated sulfuric acid liquid was 4∶1,the flow rate was 15 L/min,the leaching temperature was 80~85℃,the leaching time was 3.0 h,and the initial pH value was 1.0~1.5.The leaching rates of Zn and Cd reached 90%and 88%,respectively.The leaching residue contains 75%Cu,0.6%Cd and 3.5%Zn,and the enrichment effect of copper is obvious.It is of great significance to realize source emission reduction and reduce secondary pollution of toxic metal cadmium.

关 键 词：湿法炼锌 铜镉渣 连续浸出 锌 镉 

分 类 号：TF813[冶金工程—有色金属冶金]