1. An integrated insight into bioleaching performance of chalcopyrite mediated by microbial factors: Functional types and biodiversity.
- Author
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Tao, Jiemeng, Liu, Xueduan, Luo, Xinyang, Teng, Tingkai, Jiang, Chengying, Drewniak, Lukasz, Yang, Zhendong, and Yin, Huaqun
- Subjects
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BACTERIAL leaching , *CHALCOPYRITE , *MICROBIAL diversity , *BIODIVERSITY , *IRON ions , *COPPER ions , *REDUCTION potential - Abstract
• Effects of microbial types and diversity on chalcopyrite bioleaching were studied. • Community with more sulfur oxidizers and high diversity showed high Cu recovery. • Microbial types showed greater influences on mineral dissolution than biodiversity. • A. caldus enhanced CuFeS 2 extraction greatly by regulating physicochemical factors. Six artificial communities with different function or biodiversity were reconstructed by six typical bioleaching species for chalcopyrite leaching. Absence of sulfur oxidizers in communities significantly reduced copper extraction rates, and low diversity communities also exhibited slightly poor bioleaching performances. The variations of pH, redox potential, ferrous and copper ions indicated that the community with both sulfur oxidizers and high diversity showed fast adaptation to the environment and rapid dissolution of chalcopyrite. Integrated analysis of mineralogical and microbial parameters demonstrated that functional types of microorganisms made more contributions in mediating chalcopyrite dissolution than microbial diversity. Further correlation analysis between microbial types and chalcopyrite dissolution performances showed that sulfur oxidizers, especially Acidithiobacillus caldus , could greatly accelerate chalcopyrite dissolution by regulating solution physicochemical factors, such as redox potential and pH. This study provided a theoretical basis for improving bioleaching efficiency by balancing microbial functional types and biodiversity. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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