Effect of potential on characteristics of surface film on natural chalcopyrite

作     者：俞娟 杨洪英 范有静 YU Juan;YANG Hong-ying;FAN You-jing

作者机构：东北大学材料与冶金学院沈阳110004 东北大学理学院沈阳110004 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2011年第21卷第8期

页      面：1880-1886页

核心收录：

学科分类：081902[工学-矿物加工工程] 0819[工学-矿业工程] 08[工学] 

基　　金：Project (50874030) supported by the National Natural Science Foundation of China Project (N090602011) supported by the Fundamental Research Funds for the Central Universities, China Project (2009AA06Z104) supported by the National High-Tech Research and Development Program of China 

主　　题：potential chalcopyrite surface film xanthate 

摘      要：Electrochemical behavior of natural chalcopyrite in electrolyte solution containing 5×10？4 mol/L ethyl xanthate, and the effect of potential on the composition and characteristics of surface film were studied by cyclic voltammetry （CV）, scanning electron microscopy （SEM） and electrochemical impedance spectroscopy （EIS）. The adsorption of xanthate （X？） occurred on the mineral surface at open-circuit potential （OCP）. In the potential range from -0.11 to 0.2 V, the electrochemical reaction related to the formation of the hydrophobic film of dixanthogen （X2） occurred on natural chalcopyrite surface. This surface film had high coverage and large thickness at the potential of 0 V, but it had low coverage and small thickness at the potentials of 0.1 V and 0.2 V. Electrochemical activation started to occur when the potential was higher than 0.2 V, and the film of X2 transformed to plenty of Cu（Ⅱ） and Fe（Ⅲ） oxygen-containing species which had the porous and loose characteristics.