(1. 中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083；2. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 為提高生物浸出Pb/Zn冶煉廢渣中有價金屬的浸出率，利用正交設(shè)計，通過搖瓶實驗，研究微生物浸出某Pb/Zn冶煉廢渣過程中溫度、pH值、廢渣濃度及浸出時間等對廢渣中Cu，Zn，In，Ga，Pb和Ag等有價金屬浸出的影響。結(jié)果表明，在pH值為1.5、廢渣濃度為5%、溫度為65 ℃的優(yōu)化浸出條件下生物浸出4d，Pb/Zn冶煉廢渣中有價金屬Cu，Zn，In和Ga的浸出率分別達到95.5%，93.5%，85.0%和80.2%，而Pb和Ag則主要以硫酸鉛、黃鉀鐵礬類物質(zhì)或硫化銀形式富集在余渣中。
關(guān)鍵字: Pb/Zn冶煉廢渣；有價金屬；生物浸出；浸出條件優(yōu)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
