Bioleaching of chalcopyrite by pure and mixed culture |
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Authors: | ZHANG Yan-sheng QIN Wen-qing WANG Jun ZHEN Shi-jie YANG Cong-ren ZHANG Jian-wen NAI Shao-shi QIU Guan-zhou Key Laboratory of Biometallurgy of Ministry of Education School of Minerals Processing Bioengineering Central South University Changsha China |
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Affiliation: | Key Laboratory of Biometallurgy of Ministry of Education, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China |
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Abstract: | The bioleaching of chalcopyrite in shake flasks was investigated by using pure Acidithiobacillus ferrooxidans and mixed culture isolated from the acid mine drainage in Yushui and Dabaoshan Copper Mine in China,marked as YS and DB,respectively.The mixed culture consisted mainly of Acidithiobacillus ferrooxidans,Acidithiobacillus thiooxidans,and Leptospirillum spp.(Leptospirillum ferriphilum and Leptospirillum ferrooxians).The results show that the mixed culture is more efficient than the pure Acidithiobacillus ferrooxidans because of the presence of the sulfur-oxidizing cultures that positively increase the dissolution rate and the recovery of copper from chalcopyrite.The pH value decreases with the decrease of chalcopyrite leaching rate,because of the formation of jarosite as a passivation layer on the mineral surface during bioleaching.In the bioleaching using the mixed culture,low pH is got from the sulfur oxidizing inhibiting,the formation of jarosite.The copper extraction reaches 46.27% in mixed culture and 30.37% in pure Acidithiobacillus ferrooxidans after leaching for 75 d. |
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Keywords: | chalcopyrite bioleaching Acidithiobacillus ferrooxidans mixed culture |
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