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Comparative Study of Microbial Contact Effect on Complex Copper Sulfide Concentrate Containing Enargite, Covellite and Digenite

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Abstract

In this study, the contact effects between mesophile bacteria and minerals were observed to enhance the bioleaching kinetics, which demonstrated that the adsorption of bacteria to mineral surfaces could improve the dissolution of arsenic and copper. The microstructure results also demonstrated that after the contact bioleaching, residue surfaces were rougher and with more corrosion bars and pits. Compared to contact oxidation approach, ferric ions, acting as the only oxidants in the non-contact bioleaching process, play a more important role in the copper extraction and arsenic dissolution, which is consistent with the previous works about indirect leaching mechanism. Due to the presence of various mesophiles in the contact oxidation, their activities and corresponding preferences for energy sources influenced by temperature were observed, causing differences in the sulfides’ dissolution: ferrous ions were inclined to be oxidized biologically at 30 °C, whereas sulfide minerals, including enargite, were preferentially oxidized at 45 °C.

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Acknowledgements

The authors would like to acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 51504071, 51474075) and Horizontal Technical Contract—Research on Optimization of Electrowinning Process Technology for Zijinshan Copper Wet Process Plant (No.2023530101000288).

Funding

National Natural Science Foundation of China, 51504071, Buming Chen, 51474075, Buming Chen and Horizontal Technical Contract—Research on Optimization of Electrowinning Process Technology for Zijinshan Copper Wet Process Plant, 2023530101000288, Buming Chen

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Authors and Affiliations

  1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Cheng Jiang, Buming Chen, Jun Guo & Zhongcheng Guo

  2. State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores, Xiamen, 361101, China

    Cheng Jiang, Zengling Wu & Zhenghui Wu

  3. Research Center of Metallurgical Electrode Materials Engineering Technology, Kunming, 650106, Yunnan Province, China

    Buming Chen, Jun Guo & Zhongcheng Guo

  4. Kunming Hendera Science and Technology Co., Ltd., Kunming, 650106, China

    Buming Chen & Zhongcheng Guo

Authors
  1. Cheng Jiang
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  3. Jun Guo
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  4. Zhongcheng Guo
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Correspondence to Buming Chen, Jun Guo or Zhongcheng Guo.

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Jiang, C., Chen, B., Guo, J. et al. Comparative Study of Microbial Contact Effect on Complex Copper Sulfide Concentrate Containing Enargite, Covellite and Digenite. Trans Indian Inst Met (2024). https://doi.org/10.1007/s12666-024-03321-z

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