学术
摘 要:
在25℃，pH-2的条件下，通过对电极表面的电化学行为以及表面XPS分析，研究黄铜矿氧化分解的机理。循环伏安曲线表明，电位在400～800mV范围时黄铜矿发生部分阳极氧化反应，分解电流很小，反应生成中间产物。黄铜矿在电位小于-400mV的外加电位下发生强烈的阴极还原反应，还原产物可进行较强的阳极分解反应，但是反应随后受到钝化。对在外加恒电位E=550mV氧化100s后黄铜矿电极表面主要物质成分比例Cu：Fe：S为1：0．90：2．97。硫元素仍然主要以S^2-的形式存在，其次是单质硫。[著者文摘]
文章出处:
《有色金属》-2008年60卷1期,66 -57-61,66页
栏目信息:
文献标识码:
A
文章编号:
1001-0211（2008）01-0057-06
Mechanism on Chalcopyrite Oxidation in Acidic Solution at Ambient Temperature
FENG Qi-ming , LU Yi-ping , JIANG Xiao-hui, OU Le-ming , ZHANG Guo-fan （ School of Minerals Processing ＆ Bioengineering, Central South University, Changsha 410083, China ）
Abstract:
The mechanism on oxidization of chalcopyrite is investigated by analysis of electrochemical behaviors and XPS analysis on surface of the oxidized chalcopyrite electrode at T = 25℃, pH = 2. It is indicated by cycling volt-ampere curves that the chalcopyrite is weakly anodic oxidized when applied potential 400- 800mV, meanwhile, the intermediate product formed during this process. The reduction of chalcopyrite when applied negative potential lower than - 400mV is performed strongly, and the products of reduction could be anodic oxidized under the larger positive potential, but this reaction also be passivated later. The surface composition of the oxidized chalcopyrite electrodes applied potential E = 550mV for 100s are in the proportion of 1 ： 0.90 ： 2.97 for Cu ：Fe：S. The S element is mainly in the form of S^2- , secondly in the elemental form.[著者文摘]
Key words:
metallurgical technology; chalcopyrite; leaching; passivation; electrochemistry
基金资助:
国家“973”计划项目（2004CB619204）
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