硫化矿阳极氧化的交流阻抗

来源期刊：中南大学学报(自然科学版)2006年第2期

论文作者：王少芬 方正

文章页码：274 - 279

关键词：硫化矿;交流阻抗法;发电浸出

Key words：sulfide mineral; alternating current impedance technique; electrogenerative leaching

摘    要：采用交流阻抗法研究硫化矿碳糊电极体系在氯化钠电解液中的界面动力学行为。建立了硫化矿发电浸出过程的等效电路,从理论上推导硫化矿发电浸出过程的交流阻抗复数平面图。研究结果表明:复数平面图由位于第一象限的1个半圆和1条与实轴成45°角的直线两部分组成,半圆由电化学反应电阻和双电层电容引起,直线为通过钝化硫层和未浸出的硫化矿层的扩散引起;矿物电极的极化过程由电化学极化和浓差极化混合控制,所假设的过程与硫化矿发电浸出时阳极实际进行的过程一致。

Abstract: The interface dynamic behaviors of sulfide mineral carbon paste electrodes in NaCl electrolyte were investigated by alternating current impedance technique. An equivalent circuit of electrogenerative leaching process was postulated based on the oxidation reactions of sulfide minerals electrogenerative leaching. The alternating current impedance diagram of the process was deduced. The results show that the alternating current impedance diagram of the process is composed of one semicircle and one beeline being 45°to the horizontal axis in the first quadrants. The semicircle represents the resistance of the electrochemical reactions and capacitance of double layer and the beeline denotes the diffusion of resultant through the passivation of sulfur film and the sulfide mineral which is not reacted. The anodic polarization of sulfide minerals is controlled by electrochemistry and diffusion simultaneously. The supposed process is consistent with the actual anodic one of electrogenerative leaching of sulfide minerals.

基金信息：国家自然科学基金资助项目