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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
Source PublicationJOURNAL OF THE ELECTROCHEMICAL SOCIETY
ISSN0013-4651
Volume164Issue:12Pages:E360-E366
Abstract

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.

SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1149/2.1951712jes
Indexed BySCI
Language英语
WOS KeywordElectrochemical Reduction ; Graphite Matrix ; Melts ; Electrodeposition ; Corrosion ; Chloride ; Co2 ; Disintegration ; Conversion ; Chromium
WOS Research AreaElectrochemistry ; Materials Science
WOS SubjectElectrochemistry ; Materials Science, Coatings & Films
Funding OrganizationNational Natural Science Foundation of China(51474200 ; National Basic Research Program of China (973)(2013CB632606) ; Youth Innovation Promotion Association, CAS(2015036) ; 51422405 ; 51604255)
WOS IDWOS:000415283600136
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/23441
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.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
Recommended Citation
GB/T 7714
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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