辉锑矿在盐酸溶液中的阳极氧化

THE ANODIC OXIDATION OF STIBNITE IN HCI SOLUTION

用电位扫描法和恒电位电解法研究了Sb_2S_3在HCl溶液中的阳极氧化电化学,确定Sb_S_3的阳极溶解为不可逆电极过程。在电位0.4伏附近是三价锑与S°的生成,在电位0.8伏附近是三价锑氧化为五价,实验表明阳极溶解产物S°不能电化学氧化为SO_4^(2-)。增大H^+及Cl^-浓度,升高温度能提高Sb_S_3的溶解速度。

The anodic oxidation of stibnite in HCl solutions has been studied using voltammetry and potentiostatic method. It was established that the anodic dissolution of Sb_2S_3 is an irreversible electrode process, with trivalent antimony and S° being formed at the potential of about 0.4V, and oxidated to pentavalent antimony at the potential of about 0.8V. Experiments have also showed that it is impossible for the anodic oxidation product (elemental sulfur s°) to be further oxidated to SO_4^(2-) by an electrochemical process, and that the anodie dissolution rate of stibnite will be raised by increasing H^+ and Cl^- ion concentrations and temperature.