Enhanced copper recovery from low grade copper sulfide ores through bioleaching using residues produced by fermentation of agricultural wastes

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单位1Key Laboratory of Ministry of Education for High-Efficient Mining and Safety of Metal, University of Science and Technology Beijing;2School of Civil and Resource Engineering, University of Science and Technology Beijing收起
来源International Journal of Minerals,Metallurgy and Materials
出版年2022
期号第12期
摘要
Effects of residues produced by agricultural wastes fermentation (AWF) on low grade copper sulfide ores bioleaching, copper recovery, and microbial community were investigated. The results indicated that adding appropriate bulk of AWF made contributions to low grade copper sulfide ores bioleaching, which may be mainly realized through reducing the passivation layer formed by Fe3+hydrolysis. Improved copper recovery (78.35%) and bacteria concentration (9.56×10~7 cells·mL-1) were yielded in the presence of 5 g·L-1AWF. The result of 16S rDNA analysis demonstrated that microbial community was differentiated by adding AWF. Bacteria proportion, such as Acidithiobacillus ferrooxidans, Moraxella osloensis, and Lactobacillus acetotolerans changed distinctly. Great difference between samples was showed according to beta diversity index, and the maximum value reached 0.375. Acidithiobacillus ferrooxidans accounted for the highest proportion throughout the bioleaching process, and that of sample in the presence of 5 g·L-1 AWF reached 28.63%. The results should show reference to application of agricultural wastes and low grade copper sulfide ores.

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