Bioleaching of zinc from gold ores using Acidithiobacillus ferrooxidans

Pakawadee Kaewkannetra, Francisco Jose Garcia-Garcia, Tze Yen Chiu

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    Pakawadee Kaewkannetra, Francisco Jose Garcia-Garcia, and Tze Yen Chiu, Bioleaching of zinc from gold ores using Acidithiobacillus ferrooxidans, Int. J. Miner. Metall. Mater., 16(2009), No. 4, pp.368-374. https://dx.doi.org/10.1016/S1674-4799(09)60066-2
    Pakawadee Kaewkannetra, Francisco Jose Garcia-Garcia, and Tze Yen Chiu, Bioleaching of zinc from gold ores using Acidithiobacillus ferrooxidans, Int. J. Miner. Metall. Mater., 16(2009), No. 4, pp.368-374. https://dx.doi.org/10.1016/S1674-4799(09)60066-2
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    Metallurgy

    Bioleaching of zinc from gold ores using Acidithiobacillus ferrooxidans

    • Department of Biotechnology, Faculty of Technology, Khon Kaen University

    • Corrosion and Protection Centre, School of Materials, The University of Manchester

    • Centre of Water Science, Cranfield University

      通信作者:

      Tze Yen Chiu E-mail: tychiu_99@yahoo.com

    中文摘要

    The present work investigated microbial leaching of zinc from ore using Acidithiobacillus ferrooxidans (ATCC 14859). The ore samples, consisted of 13wt% zinc, were obtained from a gold mine in north-eastern Thailand. A shake flask study was performed on the ore samples using a rotary shaker under the following fixed conditions (250 r·min-1, 30℃ for 16 d). The influence of various conditions, namely medium type (with and without iron), particle ore size (〈20, 20-40, 40-60, 60-100, and 〉100 mesh), ore density (20 kg·m-3, 50 kg·m-3, and 100 kg·m-3), and pH of the medium (2, 2.5, 2.8, and 3), were investigated. The microbial leaching was assessed by determining the concentration of zinc in the medium and compared with the initial sample concentration. The results show that Acidithiobacillus ferrooxidans can successfully leach zinc by as much as 6 times compared with the control experiment (without Acidithiobacillus ferrooxidans ferrooxidans). The maximum efficiency (92.3%) for microbial leaching is obtained in iron-containing medium, 20-40 mesh ore sizes, 20 kg·m-3 ore density at pH 2.8, and the zinc content is found in the medium at about 120 mg·m-1.

     

    Metallurgy

    Bioleaching of zinc from gold ores using Acidithiobacillus ferrooxidans

    Author Affilications

      • Department of Biotechnology, Faculty of Technology, Khon Kaen University

      • Corrosion and Protection Centre, School of Materials, The University of Manchester

      • Centre of Water Science, Cranfield University

    • Received: 19 July 2008;
    The present work investigated microbial leaching of zinc from ore using Acidithiobacillus ferrooxidans (ATCC 14859). The ore samples, consisted of 13wt% zinc, were obtained from a gold mine in north-eastern Thailand. A shake flask study was performed on the ore samples using a rotary shaker under the following fixed conditions (250 r·min-1, 30℃ for 16 d). The influence of various conditions, namely medium type (with and without iron), particle ore size (〈20, 20-40, 40-60, 60-100, and 〉100 mesh), ore density (20 kg·m-3, 50 kg·m-3, and 100 kg·m-3), and pH of the medium (2, 2.5, 2.8, and 3), were investigated. The microbial leaching was assessed by determining the concentration of zinc in the medium and compared with the initial sample concentration. The results show that Acidithiobacillus ferrooxidans can successfully leach zinc by as much as 6 times compared with the control experiment (without Acidithiobacillus ferrooxidans ferrooxidans). The maximum efficiency (92.3%) for microbial leaching is obtained in iron-containing medium, 20-40 mesh ore sizes, 20 kg·m-3 ore density at pH 2.8, and the zinc content is found in the medium at about 120 mg·m-1.

     

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