Cooperative effect of chalcopyrite and bornite interactions during bioleaching by mixed moderately thermophilic culture

Wang, Jun, Tao, Lang, Zhao, Hongbo, Hu, Minghao, Zheng, Xihua, Peng, Hong, Gan, Xiaowen, Xiao, Wei, Cao, Pan, Qin, Wenqin, Qiu, Guanzhou and Wang, Dianzuo (2016) Cooperative effect of chalcopyrite and bornite interactions during bioleaching by mixed moderately thermophilic culture. Minerals Engineering, 95 116-123. doi:10.1016/j.mineng.2016.06.006


Author Wang, Jun
Tao, Lang
Zhao, Hongbo
Hu, Minghao
Zheng, Xihua
Peng, Hong
Gan, Xiaowen
Xiao, Wei
Cao, Pan
Qin, Wenqin
Qiu, Guanzhou
Wang, Dianzuo
Title Cooperative effect of chalcopyrite and bornite interactions during bioleaching by mixed moderately thermophilic culture
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
1872-9444
Publication date 2016-09-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.mineng.2016.06.006
Open Access Status Not yet assessed
Volume 95
Start page 116
End page 123
Total pages 8
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Subject 2207 Control and Systems Engineering
1600 Chemistry
1909 Geotechnical Engineering and Engineering Geology
2210 Mechanical Engineering
Abstract The cooperative interactions between chalcopyrite and bornite during bioleaching by mixed moderately thermophilic culture were investigated mainly by bioleaching experiments and electrochemical experiments. Bioleaching results showed that a cooperative effect existed between chalcopyrite and bornite. When the mass ratio of chalcopyrite to bornite was 3:1, an extremely high copper extraction of more than 88% was achieved after bioleaching for 27 days. One of the major reasons for the cooperative effect was that a certain redox potential range (370-450 mV vs. Ag/AgCl) could be maintained for a long period of time during bioleaching due to the mixture of chalcopyrite and bornite. Electrochemical measurements revealed that chalcopyrite was much easier to be reduced than oxidized, while bornite was prone to be directly oxidized. Hence, galvanic effect between chalcopyrite and bornite enhanced the reduction of chalcopyrite to secondary copper-iron species and promoted the oxidative dissolution of bornite. Therefore, redox potential controlling and galvanic effect both contributed to the cooperative bioleaching of chalcopyrite and bornite.
Keyword Bioleaching microorganism
Bornite
Chalcopyrite
Electrochemistry
Redox potential
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 51374248
2016zzts470
NCET-13-0595
2014T70692
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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