Enhanced electrodeposition and separation of metallic Cr from soluble K2CrO4 on a liquid Zn cathode

doi:10.1016/j.jechem.2019.04.021

	Enhanced electrodeposition and separation of metallic Cr from soluble K2CrO4 on a liquid Zn cathode
	Weng, Wei 1,2; Wang, Zhi 3; Guo, Zhancheng 1; Jiao, Shuqiang 1; Wang, Mingyong 1
刊名	JOURNAL OF ENERGY CHEMISTRY
	2020
卷号	40 页码:204-211
关键词	Molten salt electrolysis Liquid Zn cathode Carbon contamination K2CrO4 Metallic Cr
ISSN号	2095-4956
DOI	10.1016/j.jechem.2019.04.021
英文摘要	Carbon contamination and the formation of low-valence oxides limit the preparation of refractory metals by molten salt electrolysis. In this paper, a liquid Zn cathode is adopted for the electrochemical reduction of soluble K2CrO4 to metallic Cr in CaCl2-KCl molten salt. It is found that CrO42- can be directly electrochemically reduced to Cr via a six-electron-transfer step and low-valence Cr oxides is hardly produced. The reduction rate is obviously increased from 16.7 mg(Cr) h(-1) cm(-2) on the solid Mo cathode to 58.7 mg(Cr) h(-1) cm(-2) on liquid Zn cathode. The electrodeposited Cr is distributed in liquid Zn cathode. Carbon contamination is effectively avoided due to the negligible solubility of carbon in the liquid Zn cathode. Furthermore, Cr can be effectively separated and enriched to the bottom of liquid Zn under super-gravity field, realizing the efficient acquisition of metallic Cr and recycling of liquid Zn. The method herein provides a promising route for the preparation of refractory metals with high-purity by molten salt electrolysis. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
资助项目	National Natural Science Foundation of China[51804221] ; National Natural Science Foundation of China[51474200] ; National Natural Science Foundation of China[91845113] ; China Postdoctoral Science Foundation[2018M642906] ; Fundamental Research Funds for the Central Universities[FRF-TP-18-010B1]
WOS关键词	ELECTROCHEMICAL REDUCTION ; MOLTEN-SALT ; THERMODYNAMIC PROPERTIES ; EXTRACTION ; CORROSION ; GRAPHITE ; MELT ; DEOXIDATION ; NEODYMIUM ; TITANIUM
WOS研究方向	Chemistry ; Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000492696300026
资助机构	National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; Fundamental Research Funds for the Central Universities
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/38967]
专题	中国科学院过程工程研究所
通讯作者	Wang, Mingyong
作者单位	1.Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China 2.Wuhan Univ, Hubei Int Sci & Technol Cooperat Base Sustainable, Sch Resource & Environm Sci, Wuhan 430072, Hubei, Peoples R China 3.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Weng, Wei,Wang, Zhi,Guo, Zhancheng,et al. Enhanced electrodeposition and separation of metallic Cr from soluble K2CrO4 on a liquid Zn cathode[J]. JOURNAL OF ENERGY CHEMISTRY,2020,40:204-211.
APA	Weng, Wei,Wang, Zhi,Guo, Zhancheng,Jiao, Shuqiang,&Wang, Mingyong.(2020).Enhanced electrodeposition and separation of metallic Cr from soluble K2CrO4 on a liquid Zn cathode.JOURNAL OF ENERGY CHEMISTRY,40,204-211.
MLA	Weng, Wei,et al."Enhanced electrodeposition and separation of metallic Cr from soluble K2CrO4 on a liquid Zn cathode".JOURNAL OF ENERGY CHEMISTRY 40(2020):204-211.