【摘 要】
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Bacterial community dynamics and copper leaching with applied forced aeration were investigated during low-grade copper sulph-ide bioleaching to obtain better bioleaching efficiency. Results illustrated that appropriate aeration improved bacterial concent
【机 构】
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Key Laboratory of Ministry of Education for High-Efficient Mining and Safety of Metal,University of
论文部分内容阅读
Bacterial community dynamics and copper leaching with applied forced aeration were investigated during low-grade copper sulph-ide bioleaching to obtain better bioleaching efficiency. Results illustrated that appropriate aeration improved bacterial concentrations and leach-ing efficiencies. The highest bacterial concentration and Cu2+ concentration after 14-d leaching were 7.61 × 107 cells·mL?1 and 704.9 mg·L?1, respectively, at aeration duration of 4 h·d?1. The attached bacteria played a significant role during bioleaching from 1 to 7 d. However, free bac-teria dominated the bioleaching processes from 8 to 14 d. This phenomenon was mainly caused by the formation of passivation layer through Fe3+ hydrolysis along with bioleaching, which inhibited the contact between the attached bacteria and ore. Meanwhile, 16S rDNA analysis verified the effect of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans on the bioleaching process. The results demonstrate the importance of free and attached bacteria in bioleaching.
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