Mechanism Analysis of Carbon Contamination and the Inhibition by an Anode Structure during Soluble K2CrO4 Electrolysis in CaCl2-KCl Molten Salt
Weng, Wei1; Wang, Mingyong2; Gong, Xuzhong2; Wang, Zhi2; Wang, Dong2; Guo, Zhancheng1
2017
发表期刊JOURNAL OF THE ELECTROCHEMICAL SOCIETY
ISSN0013-4651
卷号164期号:12页码:E360-E366
摘要High-efficiency electrolysis of soluble K2CrO4 was realized in the CaCl2-KCl molten salt by adopting a novel anode structure. The carbon contamination due to the accumulation of carbon particles and CO32- reduction was very detrimental to the electrolysis process when a graphite anode was used, especially for the new process that soluble K2CrO4 was directly electrolyzed to metal Cr in the CaCl2-KCl molten salt. In this paper, the carbon migration and CO32- reduction during the K2CrO4 electrolysis were analyzed and discussed. The cathodic current distribution and the competing reduction reactions between CrO42- and CO32- were analyzed. The results indicated that the current efficiency for Cr production was only 45.7% for 12 h electrolysis. Dense carbon precipitations were found on the upper surface of molten salt, which led to the short circuit between anode and cathode. Therefore, the current efficiency is very low for Cr production. Meanwhile, competing reactions between CO32- and CrO42- took place, leading to high carbon contents in the cathode products. By adopting a novel anode structure, i.e. a graphite anode with a porous MgO shroud, the carbon precipitates were eliminated and the short circuit was effectively avoided. Resultantly, the current efficiency for Cr production increased greatly from 45.7% to 88.4% and the carbon content in the cathode products decreased from 2.47 wt% to 0.57 wt%. (C) 2017 The Electrochemical Society. All rights reserved.
文章类型Article
WOS标题词Science & Technology ; Physical Sciences ; Technology
DOI10.1149/2.1951712jes
收录类别SCI
语种英语
关键词[WOS]ELECTROCHEMICAL REDUCTION ; GRAPHITE MATRIX ; MELTS ; ELECTRODEPOSITION ; CORROSION ; CHLORIDE ; CO2 ; DISINTEGRATION ; CONVERSION ; CHROMIUM
WOS研究方向Electrochemistry ; Materials Science
WOS类目Electrochemistry ; Materials Science, Coatings & Films
项目资助者National Natural Science Foundation of China(51474200 ; National Basic Research Program of China (973)(2013CB632606) ; Youth Innovation Promotion Association, CAS(2015036) ; 51422405 ; 51604255)
WOS记录号WOS:000415283600136
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/23441
专题湿法冶金清洁生产技术国家工程实验室
作者单位1.Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
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Weng, Wei,Wang, Mingyong,Gong, Xuzhong,et al. Mechanism Analysis of Carbon Contamination and the Inhibition by an Anode Structure during Soluble K2CrO4 Electrolysis in CaCl2-KCl Molten Salt[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2017,164(12):E360-E366.
APA Weng, Wei,Wang, Mingyong,Gong, Xuzhong,Wang, Zhi,Wang, Dong,&Guo, Zhancheng.(2017).Mechanism Analysis of Carbon Contamination and the Inhibition by an Anode Structure during Soluble K2CrO4 Electrolysis in CaCl2-KCl Molten Salt.JOURNAL OF THE ELECTROCHEMICAL SOCIETY,164(12),E360-E366.
MLA Weng, Wei,et al."Mechanism Analysis of Carbon Contamination and the Inhibition by an Anode Structure during Soluble K2CrO4 Electrolysis in CaCl2-KCl Molten Salt".JOURNAL OF THE ELECTROCHEMICAL SOCIETY 164.12(2017):E360-E366.
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