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	1. Investigation of surface species during bioleaching of chalcopyrite by moderately thermophilic bacteria
	WANG Jun,ZHAO Hongbo,TAO Lang,CAO Pan,QIN Wenqing,QIU Guanzhou
	Metallurgical Engineering 08 January 2015
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract: 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.
	TO cite this article:WANG Jun,ZHAO Hongbo,TAO Lang, et al. Investigation of surface species during bioleaching of chalcopyrite by moderately thermophilic bacteria[OL].[ 8 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4625972


	2. Bioleaching of chalcopyrite and marmatite by moderately thermophilic bacteria: An investigation of their interactions Stepwise bioleaching process
	WANG Jun,ZHAO Hongbo,TAO Lang,CAO Pan,QIN Wenqing,QIU Guanzhou
	Metallurgical Engineering 07 January 2015
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract: 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. )
	TO cite this article:WANG Jun,ZHAO Hongbo,TAO Lang, et al. Bioleaching of chalcopyrite and marmatite by moderately thermophilic bacteria: An investigation of their interactions Stepwise bioleaching process[OL].[ 7 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4625975

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