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

doi:10.1007/s11705-009-0049-0

Front Chem Eng Chin

2009, Vol. 3

Issue (3) : 250-254 https://doi.org/10.1007/s11705-009-0049-0

RESEARCH ARTICLE

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

Tianlong DENG^1,2(

), Yafei GUO², Mengxia LIAO¹, Dongchan LI¹

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

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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 Thiobacillus ferrooxidans 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.

Keywords green process biohydrometallurgy bioleaching reaction kinetics sulphide ores

Corresponding Author(s): DENG Tianlong,Email:tldeng@isl.ac.cn

Issue Date: 05 September 2009

Cite this article:

Tianlong DENG,Yafei GUO,Mengxia LIAO, et al. Silver-catalyzed bioleaching for raw low-grade copper sulphide ores[J]. Front Chem Eng Chin, 2009, 3(3): 250-254.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-009-0049-0
https://academic.hep.com.cn/fcse/EN/Y2009/V3/I3/250

Fig.1 Comparison of copper extraction

Fig.2 Effect of silver catalyst on copper extraction

Fig.3 Effect of temperature on bioleaching

Fig.4 Acid consumption vs copper extraction

Fig.5 A plot of = 1 - 2/3- (1 - ) time

Fig.6 A plot of 1 – (1 – ) time

Fig.7 Arrhenius plot for copper of bioleaching

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