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题名:
Bioleaching of chalcopyrite by Acidianus manzaensis under different constant pH
作者: Liu, HC; Xia, JL; Nie, ZY; Ma, CY; Zheng, L; Hong, CH; Zhao, YD; Wen, W
刊名: MINERALS ENGINEERING
出版日期: 2016
卷号: 98, 页码:80-89
关键词: Bioleaching ; Chalcopyrite ; Acidianus manzaensis ; Constant pH ; Synchrotron radiation ; XANES
DOI: 10.1016/j.mineng.2016.07.019
通讯作者: Xia, JL (reprint author), Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Peoples R China.
文章类型: 期刊论文
英文摘要: The bioleaching of pure chalcopyrite by thermophilic Archaea strain Acidianus manzaensis YN-25 under different constant pH was first comparatively investigated. Then the relevant sulfur speciation was analyzed by synchrotron radiation based X-ray diffraction (SR-XRD) and S K-edge X-ray absorption near edge structure ()CANES) spectroscopy. The acidity of the leaching solution was monitored at 3-h intervals to make it steady at pH 1.25, 1.50, 1.75, 2.00, 2.25 and 2.50, respectively. Leaching results showed that the copper ion extraction increased during chemical leaching but decreased during bioleaching when pH value decreased from 2.50 to 1.25. SR-XRD analysis showed that, during bioleaching, new elemental sulfur (5) phase was detected at all tested pH cases; new jarosite phase was detected at cases of pH 1.50 to 2.50; and jarosite gradually became a major phase when pH value increased. XANES analysis further showed that covellite was detected during bioleaching at cases of pH 1.25 to 2.00 at higher redox potential (ORP) value, while chalcocite and bornite were detected at cases of pH 2.25 and 2.50 at lower ORP value. These results suggested that the formation of S was mainly accounting for hindering the dissolution of chalcopyrite while the formation of bornite could accelerate the dissolution of chalcopyrite by A. manzaensis. (C) 2016 Elsevier Ltd. All rights reserved.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000385603200011
ISSN号: 0892-6875
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/26441
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
Liu, HC,Xia, JL,Nie, ZY,et al. Bioleaching of chalcopyrite by Acidianus manzaensis under different constant pH[J]. MINERALS ENGINEERING,2016-01-01,98:80-89.
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