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首页> 外文会议>International Conference on Copper 2003-Cobre 2003 v.6 book 1; 20031130-20031203; Santiago; CL >Aqueous speciation of electrowinning solutions
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Aqueous speciation of electrowinning solutions

机译：电积溶液的水形态

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The copper electrowinning (EW) process requires concentrated solutions in order to accelerate the mass transport and charge transport processes, to increase solution conductivity and to reduce the cell volume. These solutions are formed by water, sulphuric acid and dissolved metal ions (copper and impurities such as Fe and Mn). This work presents measurements and the development of an aqueous speciation model of concentrated multicomponent solutions present in EW operations. The model consists of mass balances and chemical equilibrium relationships. Ionic and solute activities were calculated with the extended Debye-Hueckel model for the Cu(Ⅱ)-Fe(Ⅱ)-Fe(Ⅲ)-Mn(Ⅱ)-Mn(Ⅲ)-H_2SO_4-H_2O system. The model was implemented using a multi-dimensional Newton-Raphson algorithm programmed in MATLAB~(~R) software. Results indicate that main dissolved species at 50℃ were HSO_4~-, H~+, CuSO_(4(aq)), Cu~(2+), FeSO_(4(aq)), FeHSO_4~+, FeH(SO_4)_(2(aq)), MnSO_(4(aq)) and MnSO_4~+. The activity of cupric ions increases with temperature and decreases with sulphate ion concentration because of its tendency to form associated species such as CuSO_(4(aq)). Bisulphate concentration increases with solution acidity, which reduces the amount of dissolved hydrogen ions (H~+) and consequently, the ionic conductivity of the solution. The presence of bisulphate produces a buffer effect that keeps the solution conductivity fairly constant during the EW process.
机译：铜电解沉积（EW）工艺需要浓缩溶液，以加速质量传输和电荷传输过程，增加溶液电导率并减小电池体积。这些溶液是由水，硫酸和溶解的金属离子（铜和诸如Fe和Mn等杂质）形成的。这项工作介绍了电子战操作中存在的浓缩多组分溶液的水形态学模型的测量和发展。该模型由质量平衡和化学平衡关系组成。用扩展的Debye-Hueckel模型计算了Cu（Ⅱ）-Fe（Ⅱ）-Fe（Ⅲ）-Mn（Ⅱ）-Mn（Ⅲ）-H_2SO_4-H_2O体系的离子和溶质活性。该模型是使用在MATLAB®软件中编程的多维Newton-Raphson算法实现的。结果表明，在50℃时主要溶解物为HSO_4〜-，H〜+，CuSO_（4（aq）），Cu〜（2 +），FeSO_（4（aq）），FeHSO_4〜+，FeH（SO_4）_ （2（aq）），MnSO_（4（aq））和MnSO_4〜+。铜离子的活性随着温度的升高而增加，而随着硫酸根离子浓度的降低而降低，这是因为铜离子倾向于形成缔合的物种，例如CuSO_（4（aq））。硫酸氢盐浓度随着溶液的酸度增加而增加，这减少了溶解的氢离子（H〜+）的量，因此减少了溶液的离子电导率。亚硫酸氢盐的存在产生缓冲作用，在EW过程中保持溶液的电导率相当恒定。

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