Characterization of the thermo-reduction process of chalcopyrite at 65 °C by cyclic voltammetry and XANES spectroscopy
Characterization of the thermo-reduction process of chalcopyrite at 65 °C by cyclic voltammetry and XANES spectroscopy
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DOI：
10.1016/j.hydromet.2011.01.011
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发表时间：
2011-04-01
期刊：
影响因子：
4.7
通讯作者：
Zhao Yi-Dong
中科院分区：
文献类型：
--
作者：
Liang Chang-Li;Xia Jin-Lan;Zhao Yi-Dong
在65 ℃和pH 1.5下，用循环伏安法研究了块状黄铜矿电极的热还原。还研究了扫描极限对黄铜矿电化学行为的影响，以及通过硫K-、Fe L3-和Cu L-3边X射线近结构吸收（XANES）光谱表征的电极表面还原中间体。确定了黄铜矿还原为中间产物的转化条件。黄铜矿转化为黄铜矿的还原过程发生在0.1 ~-0.1V的电位范围内，是黄铜矿后续还原的起始和限速步骤。辉铜矿和黄铜矿还原为辉铜矿的电位范围为-0.1至-0.56 V。当电位低于-0.5 V时，元素铜的形成得到确认。（C）2011 Elsevier B. V.保留所有权利。
The thermo-reduction of a massive chalcopyrite electrode was investigated at 65 degrees C and pH 1.5, in terms of cyclic voltammetry. The influences of scan limits on the electrochemical behavior of chalcopyrite were also studied, as well as the reduction intermediates on the electrode surface characterized by sulfur K-, Fe L3- and Cu L-3-edge X-ray absorption near structure (XANES) spectroscopy. The transformation conditions for the reduction of chalcopyrite to intermediate products were ascertained. The reduction process that transformed chalcopyrite to bornite took place in the potential range of 0.1 to -0.1 V. and is the initial and rate-limiting step of the successive chalcopyrite reduction. The reduction of bornite and chalcopyrite to chalcocite took place in the potential range of -0.1 to -0.56 V. while the formation of elemental copper was confirmed, when the potential was more negative than -0.5 V. (C) 2011 Elsevier B.V. All rights reserved.