(School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China)
摘 要: 研究铜电解过程中As(Ⅲ)初始浓度对电解液净化的影响及其氧化动力学。结果表明：当电流密度为235 A/m2、电解时间为168 h、电解液中As(Ⅲ)初始浓度为0时，总As浓度(TAs)从10.00 g/L增加至10.62 g/L，Sb的浓度从0.40 g/L增加至0.45 g/L，Bi的浓度从0.22 g/L增加至0.24 g/L；当As(Ⅲ)初始浓度为5.00 g/L时，As(Ⅲ) 从5.00 g/L下降至1.80 g/L，TAs从10.00 g/L下降至9.70 g/L，Sb的浓度从0.40 g/L下降至0.26 g/L，Bi的浓度从0.22 g/L下降至0.18 g/L；当电流密度为235 A/m2，电解时间为144 h时，As(Ⅲ)的浓度从7.62 g/L下降至3.71 g/L，TAs浓度约为11.16 g/L，Sb的浓度从0.22 g/L微增至0.26 g/L，Bi的浓度为0.086 g/L。在铜电解过程中，As(Ⅲ)能够抑制电解液中TAs、Sb和Bi的浓度的增加，具有净化铜电解液的作用；As(Ⅲ)不断被氧化，其氧化反应符合一级反应动力学规律，活化能为46.11 kJ/mol。
关键字: 铜电解液；净化；As(Ⅲ)；反应动力学
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The purification effect of initial As(Ⅲ) concentration on copper electrolyte and the oxidation kinetics of As(Ⅲ) in copper electrolysis were investigated. When the current density is 235 A/m2, the electrolysis time is 168 h and the initial As(Ⅲ) concentration in electrolyte is 0, the total As(TAs) concentration increases from 10.00 g/L to 10.62 g/L, the Sb concentration increases from 0.40 g/L to 0.45 g/L, and the Bi concentration increases from 0.22 g/L to 0.24 g/L. When the initial As(Ⅲ) concentration is 5.0 g/L, the As(Ⅲ) concentration decreases from 5.00 g/L to 1.80 g/L, TAs concentration decreases from 10.00 g/L to 9.70 g/L，the Sb concentration decreases from 0.40 g/L to 0.26 g/L，the Bi concentration decreases from 0.22 g/L to 0.18 g/L. The results show that when the current density is 235 A/m2, the electrolysis time is 144 h, the As(Ⅲ) concentrations decreases from 7.62 g/L to 3.71 g/L, TAs concentration is about 11.16 g/L, the Sb concentration slightly increases from 0.22 g/L to 0.26 g/L, the Bi concentration is 0.086 g/L. In the process of copper electrolysis, As(Ⅲ) can restrain the increase of the concentrations of TAs, Sb and Bi, and it has purification effect on copper electrolyte. As(Ⅲ) is gradually oxidized, and the oxidation process is applicable to the first-order kinetic model, the activation energy of the reaction is 46.11 kJ/mol.
Key words: copper electrolyte; purification; As(Ⅲ); reaction kinetics
