(四川大学 化工学院， 成都 610065)
摘 要: 研究了湿法炼锌电解过程中，用SO2在阳极放电代替传统的水分解放电而降低槽电压，以达到节能的目的。使用铂作阳极，在电解液中通入SO2进行电解，节能可达40%。通过SO2阳极极化曲线的测定，考察了SO2浓度、H2SO4浓度、温度和搅拌速度对阳极反应速率的影响。研究表明：在铂阳极上SO2阳极反应符合电化学控制，遵从塔菲尔公式；SO2的反应级数为3.3，表观活化能为31.8 kJ/mol，硫酸的反应级数为零。
关键字: 锌电解； SO2阳极反应； 动力学； 节能
（College of Chemical Engineering,
Sichuan University, Chengdu 610065, P.R.China）
Abstract:The anodic oxidation of sulfur dioxide instead of water in zinc hyrometallurgy was studied for energy saving. The experimental results show that under experimental conditions energy consumption can be reduced by 40%. The effects of SO2 concentration, H2SO4 concentration, temperature and stirring speed on anodic reaction rate were investigated using potentiostatic polarization measurement. The results indicate that the SO2 anodic reaction process is electrochemically controlled and obeys Tafel equation. The apparent activation energy for SO2 anodic reaction is 31.8 kJ/mol, and the orders of anodic reaction are 3.30 and zero with respect to SO2 and H2SO4respectively.
Key words: zinc electrowinning; SO2 anodic reaction; kinetics; energy saving
