黄铁矿在氯化钴中的电化学氧化机理研究

Mechanism of electrochemical oxidation of pyrite in cobalt chloride

以镶嵌有黄铁矿的石墨棒为工作电极,利用开路电位、循环伏安、Tafel曲线和电化学阻抗谱等电化学手段,从电化学的角度对黄铁矿在不同浓度CoCl溶液和5 mmol/L CoCl溶液浓度下不同电位的氧化过程进行了探讨。结果表明:在pH=1.0、CoCl浓度9 mmol/L溶液中黄铁矿最易被腐蚀;在pH=1.0、CoCl浓度为5 mmol/L、电位为0.4~0.8 V的条件下,黄铁矿的氧化能力先降低后升高且在0.6 V时达到最弱,而且在高电位时黄铁矿氧化能力要强于低电位。

Taking the graphite carbon rod with pyrite embedded as the working electrode, the oxidation process of pyrite in CoClsolutions of varying concentrations and the 5 mmol/L CoClsolutions at different potentials was discussed from the perspective of electrochemistry by using electrochemical means such as open circuit potential, cyclic voltammetry, Tafel curve, electrochemical impedance spectroscopy.The results showed that pyrite is most likely to be corroded in 9 mmol/L CoClsolutions under the conditions of pH=1.0;under the conditions of pH=1.0,CoClconcentration of 5 mmol/L and a potential range of 0.4-0.8 V,the oxidation capacity of pyrite first decreases and then increases, and reaches the weakest at 0.6 V,and the oxidation capacity of pyrite at higher potentials is stronger than that at lower potentials.