Kinetics of the electrochemical process of galena electrodes in the diethyldithiocarbamate solution  

作　　者：Li-li Cheng Ti-chang Sun Xian-ping Luo Dian-zuo Wang 

机构地区：[1]School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China [2]School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China [3]Chinese Academy of Engineering, Beijing 100038, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2010年第6期669-674,共6页矿物冶金与材料学报（英文版）

基　　金：supported by the National Nature Science Foundation of China (No.50704018);the Natural Science Foundation of Jiangxi Province, China (No.2007GQC0643)

摘　　要：The electrochemical process of galena in a pH 12.8 buffer solution was investigated using chronoamperometry and chronopotentiometry. To establish kinetic parameters on the surface of galena in the diethyldithiocarbamate solution, the exchange current density and the dependence of current density on reaction time were determined. Experimental results demonstrate that the exchange current density of galena is 1.585× 10^-2A/m2 in the diethyldithiocarbamate-free solution. In the diethyldithiocarbamate solution, the thickness of lead diethyldi- thiocarbamate adsorbed on the surface of galena is 3.28 molecular layers, the diffusion coefficient of diethyldithiocarbamate on the surface of galena electrodes is 1.13 × 10^-10 m2/s, and the exchange current density of galena is 0.45 A/m2. Lead diethyldithiocarbamate on the surface of galena is firmly adsorbed.The electrochemical process of galena in a pH 12.8 buffer solution was investigated using chronoamperometry and chronopotentiometry. To establish kinetic parameters on the surface of galena in the diethyldithiocarbamate solution, the exchange current density and the dependence of current density on reaction time were determined. Experimental results demonstrate that the exchange current density of galena is 1.585× 10^-2A/m2 in the diethyldithiocarbamate-free solution. In the diethyldithiocarbamate solution, the thickness of lead diethyldi- thiocarbamate adsorbed on the surface of galena is 3.28 molecular layers, the diffusion coefficient of diethyldithiocarbamate on the surface of galena electrodes is 1.13 × 10^-10 m2/s, and the exchange current density of galena is 0.45 A/m2. Lead diethyldithiocarbamate on the surface of galena is firmly adsorbed.

关 键 词：GALENA ELECTROCHEMISTRY FLOTATION KINETICS 

分 类 号：O646.54[理学—物理化学] TQ564[理学—化学]