(1. 中南大学 资源加工与生物工程学院，长沙 410083；2. 中南大学 冶金科学与工程学院，长沙 410083)
摘 要: 为提高生物浸出Pb/Zn冶炼废渣中有价金属的浸出率，利用正交设计，通过摇瓶实验，研究微生物浸出某Pb/Zn冶炼废渣过程中温度、pH值、废渣浓度及浸出时间等对废渣中Cu，Zn，In，Ga，Pb和Ag等有价金属浸出的影响。结果表明，在pH值为1.5、废渣浓度为5%、温度为65 ℃的优化浸出条件下生物浸出4d，Pb/Zn冶炼废渣中有价金属Cu，Zn，In和Ga的浸出率分别达到95.5%，93.5%，85.0%和80.2%，而Pb和Ag则主要以硫酸铅、黄钾铁矾类物质或硫化银形式富集在余渣中。
关键字: Pb/Zn冶炼废渣；有价金属；生物浸出；浸出条件优化
（1. School of Resources Processing and Bio-engineering, Central South University, Changsha 410083, China;2. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:In this study, the main variables involved in the bioleaching process include temperature, pH, pulp density and leaching time. These variables were studied through a shaking flask experiment by orthogonal design in order to improve the leaching rate of metal values, including Cu, Zn, In, Ga, Pb and Ag, from the Pb/Zn smelting slag. The results show that bioleaching rate of Cu, Zn, In and Ga in the Pb/Zn smelting slag under optimized conditions (pH 1.5, temperature 65 ℃, 5% pulp density and a leaching time of 4 d) is 95.5%, 93.5%, 85.0% and 80.2% respectively. Lead and silver, however, are mostly deposited in the leached residues with the forms of lead sulfate, argentojarosite-type or silver sulfide compounds, respectively.
Key words: Pb/Zn smelting slag; metal values; bioleaching; optimization of bioleaching variables
