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Bioleaching of chalcopyrite and marmatite by moderately thermophilic bacteria: An investigation of their interactions Stepwise bioleaching process
WANG Jun 1 *,ZHAO Hongbo 2,TAO Lang 1,CAO Pan 2 #,QIN Wenqing 1,QIU Guanzhou 2
1.School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China
2.Key Lab of Biohydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China
*Correspondence author
#Submitted by
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Funding: China Postdoctoral Science Foundation (No.project No. 2014T70692), the National Natural Science Foundation of China)
Opened online:14 January 2015
Accepted by: none
Citation: WANG Jun,ZHAO Hongbo,TAO Lang.Bioleaching of chalcopyrite and marmatite by moderately thermophilic bacteria: An investigation of their interactions Stepwise bioleaching process[OL]. [14 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4625975
 
 
Chalcopyrite and marmatite are associated together most of the time in the raw ores and flotation concentrates. In this work, the interactions between chalcopyrite and marmatite during bioleaching by moderately thermophilic bacteria were investigated mainly by electrochemical measurements and bioleaching experiments. In the initial stage of bioleaching of mixture of chalcopyrite and marmatite, the dissolution of marmatite was preferential, and was significantly accelerated with the addition of chalcopyrite because of the galvanic effect and catalytic effect of Cu2+ ions, while the dissolution of chalcopyrite was inhibited mainly due to the galvanic effect before the accomplishment of dissolution of marmatite. Chalcopyrite dissolved fast when the dissolution of marmatite finished, and small amount of marmatite cannot inhibit the final copper extraction of chalcopyrite if leaching time was long enough. Therefore, stepwise or selective bioleaching was feasible in processing mixture of chalcopyrite and marmatite to avoid complex flotation process in separating chalcopyrite and marmatite. )
Keywords:Bioleaching; Chalcopyrite; Marmatite; Interactions; Moderately thermophilic bacteria
 
 
 

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