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Direct electro-deposition of metallic chromium from K2CrO4 in the equimolar CaCl2-KCl molten salt and its reduction mechanism
Weng, Wei1; Wang, Mingyong2; Gong, Xuzhong2; Wang, Zhi2; Wang, Dong2; Guo, Zhancheng1
2016-09-10
Source PublicationELECTROCHIMICA ACTA
ISSN0013-4686
Volume212Issue:SEPPages:162-170
Abstract

Spongiform metallic chromium was obtained directly from K2CrO4 in the equimolar CaCl2-KCl molten salt by electrolysis at 1173 K and this reduction mechanismwas discussed. The chemical composition and microstructure of the products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The reduction mechanismwas analyzed by cyclic voltammetry, square wave voltammetry and potentiostatic electrolysis. K2CrO4 is soluble in the molten chlorides. The soluble CaCrO4 was easily formed in the molten CaCl2-KCl before electrolysis and dissociated to Ca2+ and CrO42. The CrO42 was firstly electro-reduced to CaCr2O4 by a three-electrontransfer process and CaO was released simultaneously. The generated CaO with a high solubility was dissolved into the CaCl2-KCl molten salt and electro-reduced to metallic calcium. As the electrolysis proceeded, the amount of released CaO increased and more CaOwas electro-reduced to Ca. CrO42 can be reduced to CaCr2O4 by electrolysis and calcium reduction simultaneously. Then, CaCr2O4 was further reduced to metallic chromium by the dissolved Ca in the near-cathode region. However, the inclusion of a little CaCr2O4 brought oxygen into metallic Cr powders. (C) 2016 Elsevier Ltd. All rights reserved.

KeywordElectrolysis K2cro4 Metallic Chromium Cacr2o4 Molten Chlorides
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.electacta.2016.06.142
Indexed BySCI
Language英语
WOS KeywordIN-SITU ELECTROLYSIS ; CALCIOTHERMIC REDUCTION ; ELECTROCHEMICAL REDUCTION ; PHASE-DIAGRAM ; TITANIUM-OXIDE ; CHLORIDE ; CHROMATE ; BEHAVIOR ; NICKEL ; ALLOY
WOS Research AreaElectrochemistry
WOS SubjectElectrochemistry
Funding OrganizationNational Basic Research Program of China (973)(2013CB632606) ; National Natural Science Foundation of China(51474200) ; Youth Innovation Promotion Association, CAS(2015036)
WOS IDWOS:000382250200020
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/21307
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. Direct electro-deposition of metallic chromium from K2CrO4 in the equimolar CaCl2-KCl molten salt and its reduction mechanism[J]. ELECTROCHIMICA ACTA,2016,212(SEP):162-170.
APA Weng, Wei,Wang, Mingyong,Gong, Xuzhong,Wang, Zhi,Wang, Dong,&Guo, Zhancheng.(2016).Direct electro-deposition of metallic chromium from K2CrO4 in the equimolar CaCl2-KCl molten salt and its reduction mechanism.ELECTROCHIMICA ACTA,212(SEP),162-170.
MLA Weng, Wei,et al."Direct electro-deposition of metallic chromium from K2CrO4 in the equimolar CaCl2-KCl molten salt and its reduction mechanism".ELECTROCHIMICA ACTA 212.SEP(2016):162-170.
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