铜冶炼厂低铟烟尘中浸取有价金属的研究

Leaching Process for Comprehensive Recovery of Valuable Metals from Copper Smelter Dust with Low Indium

针对铜冶炼厂低铟烟尘中有价金属的综合回收工艺路线的设计,分别考察了硫酸浓度、液固比、浸出时间、浸出温度、氧化剂和添加剂对烟尘中不同金属浸出率的影响。提出了从烟尘中浸取有价金属的最佳工艺条件:硫酸初始浓度2.0 mol.L-1,液固比6∶1,浸出时间4 h,浸出温度75℃。在该工艺条件下,铟的浸出率达到75.6%,而锌、镉、铜的浸出率分别达到98.3%,90.8%,64.6%,铅和铋主要留在滤渣中。

The design of technical process for comprehensive recovery from low indium dust was investigated.The influences of the concentration of sulfuric acid concentration,the ratio of liquid to solid,leaching time,leaching temperature,oxidant,additive on the leaching ratio of Lead,Bismuth,Copper,Zinc,Cadmium and Indium were studied.It was shown that the most optimized leaching process was sulfuric acid concentration of 2 mol·L-1,the ratio of liquid to solid was 6∶1,the leaching time was 4 h and the leaching temperature was 75 ℃.Under these conditions,the leaching ratio of Zinc,Cadmium,Copper and Indium were 98.3%,90.8%,64.6% and 75.6% respectively,while Lead and Bismuth mainly remained in filtration residue.