Column bioleaching of low-grade copper ores by Acidithiobacillus ferrooxidans in pure and mixed cultures with a heterotrophic acidophile Acidiphilium sp.
The aim of this investigation was to compare a pure culture of Acidithiobacillus ferrooxidans GF with a mixed culture with Acidiphilium sp. DX1-1 in the bioleaching of low-grade copper ores. The leaching experiments were carried out at ambient temperature. The influences of temperature, pH, redox potential and concentrations of total iron and ferric ion in solution on the performance of column bioleaching were also investigated. Total DNA was extracted from the mineral samples taken at different depths from the column top surface and the corresponding microbial community structures were examined using Amplified Ribosomal DNA Restriction Analysis (ARDRA). Copper extractions by the pure and mixed cultures achieved 14. 87％ and 20. 11％ respectively over a period of 117 days, including 15 days of acid preleaching and 102 days of bioleaching. The ratios between autotrophic and heterotrophic bacteria at the top and bottom portions of the columns were 1. 20 : 1 and 2. 14 :1 , respectively.
column bioleaching low-grade copper ore Acidithiobacillus ferrooxidans Acidiphilium sp.
Yu Yang Mengxue Diao Kai Liu Lin Qian Anh V. Nguyen Guanzhou Qiu
School of Minerals Processing and Bioengineering, Central South University, 410083, Changsha, China School of Chemical Engineering, The University of Queensland, Brisbane, 4072, Queensland, Australia School of Minerals Processing and Bioengineering, Central South University, 410083, Changsha, China School of Environmental Science and Engineering, Donghua University, 201620, Shanghai, China
国际会议
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)
长沙
英文
66-72
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）