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2009, Volume 3, Issue 3

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Frontiers of Chemical Science and Engineering >> 2009, Volume 3, Issue 3 doi: 10.1007/s11705-009-0049-0

Silver-catalyzed bioleaching for raw low-grade copper sulphide ores

1. College of Materials, Chemistry and Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China; 2. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China

Available online: 2009-09-05
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Abstract

This research was conducted to investigate the biooxidation and copper dissolution from raw low-grade refractory copper sulphide ores located in the Xinjiang Autonomous Region of China using adapted bacteria. In order to accelerate the bioleaching rate, the adapted mixed bacteria and silver ion catalyst were tested in the leach columns at laboratory scale. The overall acid consumption was 4.3 kg sulphuric acid per kg of dissolved copper and was linearly related to the percent copper dissolution. The calculated copper dissolution rates obey the Shrinking Core Model. The relative activation energy of the whole biooxidative leaching stages was calculated to be 48.58 kJ/mol.

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