Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第11期    总第212期    2016年11月

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文章编号:1004-0609(2016)-11-2426-07
双膜三室电解槽中电沉积钴的离子传输
周 键1, 2,王三反1, 2,宋小三1, 2,张学敏1, 2

(1. 兰州交通大学 环境与市政工程学院,兰州 730070;
2. 兰州交通大学 寒旱地区水资源综合利用教育部工程研究中心,兰州 730070
)

摘 要: 针对传统氯化钴电沉积工艺阳极产氯的缺陷,采用双膜三室电解槽进行电沉积钴。通过测定各隔室中的电解液成分变化深入研究电沉积过程的离子传输行为。结果表明:在电场与浓度梯度作用下,阴极液的氯离子与阳极液的氢离子可经电迁移与扩散进入中隔室形成盐酸,盐酸浓度可达1 mol/L;并同时阻止阳极析氯,实现产酸抑氯同步化。

 

关键字: 钴;电沉积;离子交换膜电解槽;离子传输

Ion transport for electrodeposition of cobalt in double-membrane three-compartment electrolytic cell
ZHOU Jian1, 2, WANG San-fan1, 2, SONG Xiao-san1, 2, ZHANG Xue-ming1, 2

1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
2. Engineering Research Center of Water Resource Comprehensive Utilization in Cold and Arid Regions,
Ministry of Education, Lanzhou Jiaotong University, Lanzhou 730070, China

Abstract:Based on the evolution of chlorine gas at the anode in the traditional electrowinning process of cobalt chloride, the electrodeposition of cobalt was carried out in the double-membrane three-compartment electrolytic cell. The composition changes of electrolyte in three compartments were tested as function of time to study ion transport in the electrodeposition process deeply. The results show that chloride ions are able to migrate and diffuse from the catholyte to the middle solution by the electric field and concentration gradient; similarly, protons are also able to migrate and diffuse from the anolyte to the middle solution. Hence hydrochloric acid forms electrochemically up to 1mol/L, simultaneously obtaining oxygen evolution reaction instead of chlorine evolution at the anode. The production of acid is synchronized with the inhibition of chlorine evolution.

 

Key words: cobalt; electrodeposition; ion-exchange membrane electrolytic cell; ion transport

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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