Investigation of copper, iron and sulfur speciation during bioleaching of chalcopyrite by moderate thermophile Sulfobacillus thermosulfidooxidans

	Investigation of copper, iron and sulfur speciation during bioleaching of chalcopyrite by moderate thermophile Sulfobacillus thermosulfidooxidans
	Liu, HC; Nie, ZY; Xia, JL; Zhu, HR; Yang, Y; Zhao, CH; Zheng, L; Zhao, YD; Zheng L(郑雷); Zhao YD(赵屹东)
刊名	INTERNATIONAL JOURNAL OF MINERAL PROCESSING
	2015
卷号	137 页码:1-8
关键词	Bioleaching Chalcopyrite SR-XRD XANES Chemical speciation Sulfobacillus thermosulfidooxidans
英文摘要	The copper, iron and sulfur speciation of chalcopyrite leached by moderate thermophile Sulfobacillus thermosulfidooxidans was investigated by combining synchrotron radiation X-ray diffraction (SR-XRD) and X-ray absorption near edge structure (XANES) spectroscopy. Leaching experiment showed that the leaching rate of copper was 73.6% after 20 days bioleaching. Results of scanning electron microscopy of leaching residues showed that the surface of chalcopyrite was gradually corroded. Results of SR-XRD showed that orthorhombic form alpha-S-8, jarosite and chalcocite were produced at day 4; the bioleaching residue contained jarosite, covellite and alpha-S-8 besides chalcopyrite from day 8. The Cu, Fe and S K-edge XANES spectra quantitatively analyzed the copper, iron and sulfur species compositions of leaching residues, and the fitted results showed similar trend to SR-XRD results. According to both SR-XRD and XANES study, bornite and amorphous elemental sulfur mu-S were not found during bioleaching of chalcopyrite by S. thermosulfidooxidans. By conclusion, it indicated that iron-deficiency sulfide chalcocite first formed at the initiation of bioleaching with a low Eh value, and it then gradually transformed to covellite at a high Eh value. Meanwhile, alpha-S-8 and jarosite were produced as the predominant intermediates. By combining SR-XRD and XANES, it was useful for better understanding the dissolution mechanism of chalcopyrite during bioleaching by qualitatively and quantitatively analyzing in situ the surface chemical composition of the minerals. (C) 2015 Elsevier B.V. All rights reserved.
学科主题	Engineering; Mineralogy; Mining & Mineral Processing
类目[WOS]	Engineering, Chemical ; Mineralogy ; Mining & Mineral Processing
收录类别	SCI ; EI
WOS记录号	WOS:000353083600001
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228312]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Liu, HC,Nie, ZY,Xia, JL,et al. Investigation of copper, iron and sulfur speciation during bioleaching of chalcopyrite by moderate thermophile Sulfobacillus thermosulfidooxidans[J]. INTERNATIONAL JOURNAL OF MINERAL PROCESSING,2015,137:1-8.
APA	Liu, HC.,Nie, ZY.,Xia, JL.,Zhu, HR.,Yang, Y.,...&赵屹东.(2015).Investigation of copper, iron and sulfur speciation during bioleaching of chalcopyrite by moderate thermophile Sulfobacillus thermosulfidooxidans.INTERNATIONAL JOURNAL OF MINERAL PROCESSING,137,1-8.
MLA	Liu, HC,et al."Investigation of copper, iron and sulfur speciation during bioleaching of chalcopyrite by moderate thermophile Sulfobacillus thermosulfidooxidans".INTERNATIONAL JOURNAL OF MINERAL PROCESSING 137(2015):1-8.