Temperature dependence of the cathodic and anodic kinetics in a copper electrowinning cell based on reactive electrodialysis |
| |
Authors: | L. Cifuentes J. Simpson |
| |
Affiliation: | a Departamento de Ingeniería de Minas, Universidad de Chile, Tupper 2069, Santiago, Chile b Departamento de Ingeniería Metalúrgica, Universidad de Santiago, Av. Ecuador 3659, Santiago, Chile |
| |
Abstract: | The temperature dependence of various kinetic parameters for the copper electrodeposition reaction and for the ferrous to ferric ion oxidation has been experimentally determined. Potentiodynamic sweeps were carried out in a reactive electrodialysis cell in the 30- range in order to obtain expressions for each parameter as a function of temperature. In the conditions studied, for both reactions, the exchange current density depends on temperature as ln[i0(A/m2)]=-a/T+b and the limiting current density, as |iL(A/m2)|=cT-d. For the copper electrodeposition reaction, the charge transfer coefficient is constant, whereas for the ferrous to ferric ion oxidation it depends on temperature as α=fT2+gT+h (a-h are constants). These expressions can be used in a temperature-dependent model of a membrane-based copper electrowinning cell. |
| |
Keywords: | Temperature Chemical reactors Kinetics Electrochemistry Membrane Modeling |
本文献已被 ScienceDirect 等数据库收录! |
|