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Investigation of surface species during bioleaching of chalcopyrite by moderately thermophilic bacteria
WANG Jun 1 *,ZHAO Hongbo 2,TAO Lang 1 #,CAO Pan 2,QIN Wenqing 1,QIU Guanzhou 2
1.Key Lab of Biohydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China
2.School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China
*Correspondence author
#Submitted by
Subject:
Funding: China Postdoctoral Science Foundation (No.project No. 2014T70692), the National Natural Science Foundation of China)
Opened online:16 January 2015
Accepted by: none
Citation: WANG Jun,ZHAO Hongbo,TAO Lang.Investigation of surface species during bioleaching of chalcopyrite by moderately thermophilic bacteria[OL]. [16 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4625972
 
 
Electrochemical measurement, X-ray diffraction analysis (XRD) and X-ray photoelectron experiment (XPS) analysis were carried out to investigate the surface species and interfacial reactions during bioleaching of chalcopyrite by different strains of moderately thermophilic bacteria. Results showed that CuS and disulfide (S22-) were the main intermediate species on the surface of chalcopyrite during bioleaching by A. caldus, S. thermosulfidooxidans and L. ferriphilum. The low kinetics of dissolution of chalcopyrite in A. caldus can be mainly due to the incomplete dissolution of chalcopyrite and the passivation layer of polysulfide. Polysulfide and jarosite can be mainly responsible for the passivation of chalcopyrite in bioleaching by L. ferriphilum or by S. thermosulfidooxidans.
Keywords:Chalcopyrite; Surface species; Bioleaching; Passivation; Moderately thermophilic bacteria
 
 
 

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