Bioleaching of chalcopyrite by mixed cultures of Leptospirillum ferriphilum and Acidithiobacillus thiooxidans

摘要：

The bioleaching of chalcopyrite was investigated using a mixed culture consisting of iron-oxidizing L. ferriphilum and sulfur-oxidizing A. thiooxidans, in which different pH values, temperatures, ratios of L. ferriphilum to A. thiooxidans, total inoculation amount, and pulp concentration were examined. It is found that the mixed cultures are more efficient than a single pure culture. Increasing pulp concentration decreases the leaching rate of copper, while various total inoculation amount and different ratios of L. ferriphilum to A. thiooxidans have a little effect on the final leaching rate. Different temperatures and pH values also affect the leaching rate. In addition, certain value of redox potential is beneficial to the decomposition of chalcopyrite during bioleaching. Jarosite and sulfur precipitation formed in leaching process are observed using XRD and SEM/EDS, indicating that these are the major components of a passivation layer that blocks continuous copper extraction.

关键词： chalcopyrite mixed bacteria bioleaching L. ferriphilum A. thiooxidans

作者: Guohua Gu Keting Hu Shuangke Li Guanzhou Qiu

作者单位: School of Minerals Processing and Bioengineering, Central South University, 410083, Changsha. China Key Laboratory of Biometeorology, Ministry of Education, 410083, Changsha, China

会议类型: 国际会议

会议名称: The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)

会议地点: 长沙

会议语种:英文

页码: 150-155

在线出版日期: 2011-09-18（万方平台首次上网日期，不代表论文的发表时间）