School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China; Guangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, China; Key Laboratory of Mining and Metallurgy Industry Heavy Metals Pollution Control and Vocational Education of Environmental Protection of Guangdong Province, Guangzhou 510006, China.
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Chemosphere. 2017 Oct;185:1189-1196. doi: 10.1016/j.chemosphere.2017.07.124. Epub 2017 Jul 28.
Mine tailings often contain significant amounts of metals and sulfide, many traditional operations used to minerals was not as good as those currently available. This study investigated metals removal from lead-zinc mine tailings using bioleaching and followed by sulfide precipitation. Metals were dissolved from the tailings by the bacteria in a bioleaching reactor. During a 10% pulp density bioleaching experiment, approximately 0.82% Pb, 97.38% Zn, and 71.37% Fe were extracted after 50 days. With the pulp density of 10% and 20%, the dissolution of metals followed shrinking core kinetic model. Metals (Pb, Zn, and Fe) present in the pregnant bioleaching leachate. Metals were next precipitated as a sulfide phase using sodium sulfide (NaS). Metal precipitations were selectively and quantitatively produced from the bioleaching leachate by adding NaS. More than 99% of the zinc and 75% of the iron was precipitated using 25 g/L NaS in the bioleaching leachate. The results in the study were to provide useful information for recovering or removing metals from lead-zinc mine tailings.
矿山尾矿通常含有大量的金属和硫化物，许多传统的选矿方法不如目前可用的方法好。本研究采用生物浸出法和随后的硫化物沉淀法从铅锌矿尾矿中去除金属。在生物浸出反应器中，细菌将尾矿中的金属溶解。在 10%浆体密度的生物浸出实验中，经过 50 天，大约有 0.82%的 Pb、97.38%的 Zn 和 71.37%的 Fe 被提取出来。在浆体密度为 10%和 20%的情况下，金属的溶解遵循收缩核动力学模型。金属（Pb、Zn 和 Fe）存在于富矿生物浸出液中。然后使用硫化钠（NaS）将金属沉淀为硫化物相。通过在生物浸出液中添加 25g/L 的 NaS，可以从生物浸出液中选择性和定量地沉淀出金属。在生物浸出液中使用 25g/L 的 NaS 可以沉淀出超过 99%的锌和 75%的铁。本研究的结果为从铅锌矿尾矿中回收或去除金属提供了有用的信息。
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