(School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China)
摘 要: 研究銅電解過程中As(Ⅲ)初始濃度對電解液凈化的影響及其氧化動力學。結(jié)果表明：當電流密度為235 A/m2、電解時間為168 h、電解液中As(Ⅲ)初始濃度為0時，總As濃度(TAs)從10.00 g/L增加至10.62 g/L，Sb的濃度從0.40 g/L增加至0.45 g/L，Bi的濃度從0.22 g/L增加至0.24 g/L；當As(Ⅲ)初始濃度為5.00 g/L時，As(Ⅲ) 從5.00 g/L下降至1.80 g/L，TAs從10.00 g/L下降至9.70 g/L，Sb的濃度從0.40 g/L下降至0.26 g/L，Bi的濃度從0.22 g/L下降至0.18 g/L；當電流密度為235 A/m2，電解時間為144 h時，As(Ⅲ)的濃度從7.62 g/L下降至3.71 g/L，TAs濃度約為11.16 g/L，Sb的濃度從0.22 g/L微增至0.26 g/L，Bi的濃度為0.086 g/L。在銅電解過程中，As(Ⅲ)能夠抑制電解液中TAs、Sb和Bi的濃度的增加，具有凈化銅電解液的作用；As(Ⅲ)不斷被氧化，其氧化反應(yīng)符合一級反應(yīng)動力學規(guī)律，活化能為46.11 kJ/mol。
關(guān)鍵字: 銅電解液；凈化；As(Ⅲ)；反應(yīng)動力學
（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
