Effect of added cobalt ion on copper electrowinning from sulfate bath using doped polyaniline and Pb-Ag anodes

来源期刊：中国有色金属学报(英文版)2010年增刊第1期

论文作者：黄惠 周继禹 郭忠诚

文章页码：55 - 59

Key words：copper electrowinning; cobalt additive; electrode potentials; polarisation

Abstract: Effect of added Co²⁺(aq) on copper electrowinning was studied using doped polyaniline (Pani) and Pb-Ag(1%) anodes and a stainless steel cathode. The presence of added Co²⁺(aq) in the electrolyte solution was found to decrease the anode potentials. The optimum level of Co²⁺(aq) concentration in the electrolyte, with respect to the maximum saving of power consumption was established. Linear sweep voltammetry (LSV) was used to study the influence of added Co²⁺(aq) on the anodic processes in a copper sulfate-sulfuric acid electrolyte. The oxygen-evolution potential for Pani anode is depolarised at lower current densities (≤0.01 A/cm²) and attains saturation at ρ(Co²⁺)_o≈0.789 g/L; whilst the oxygen-evolution potential for Pb-Ag(1%) anode is depolarised at higher current densities (≤0.02 A/cm²) and attains saturation at ρ(Co²⁺)_o≈1.315 g/L. The preferred orientations of the copper deposits change from (220) to (111) with the addition of 0.394-0.789 g/L Co²⁺ but higher concentrations favor (220) orientation again.

基金信息：the National Natural Science Foundation of China
the Analysis and Testing Foundation of Kunming University of Science and Technology, China