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Electrochemical enhanced oxidative decomposition of chromite ore in highly concentrated KOH solution
Alternative TitleMiner. Eng.
Wang, Zhonghang1,2; Du, Hao1; Wang, Shaona1; Zheng, Shili1; Zhang, Yi1; Hwang, Seyeon3; Kim, Nam Soo3; Jeong, Tae Eui4
2014-03-01
Source PublicationMINERALS ENGINEERING
ISSN0892-6875
Volume57Issue:1Pages:16-24
AbstractA novel method which introduces an electrochemical field to enhance the oxidative decomposition of chromite in a KOH sub-molten salt medium was proposed and proven to be feasible and efficient. Under optimal reaction conditions (slot current density 750 A/m(2), alkali concentration 60 wt.%, reaction temperature 150 degrees C, alkali-to-ore mass ratio 6:1, and particle size <200 mesh), the extraction rate of chromium reached 99%, after reacting for 480 min. in comparison with the current liquid-phase oxidation technologies, the reaction temperature in the new approach is 150-250 degrees C lower, and the alkali concentration of the reaction medium is lower by more than 20%, showing substantial advantages in terms of energy efficiency, equipment corrosion alleviation and prospects for industrial application. The reaction kinetics study shows that the extraction process under optimal reaction conditions is jointly governed by surface chemical reaction and solid product layer diffusion with the apparent activation energy calculated to be 17.56 kJ/mol. (C) 2013 Elsevier Ltd. All rights reserved.; A novel method which introduces an electrochemical field to enhance the oxidative decomposition of chromite in a KOH sub-molten salt medium was proposed and proven to be feasible and efficient. Under optimal reaction conditions (slot current density 750 A/m(2), alkali concentration 60 wt.%, reaction temperature 150 degrees C, alkali-to-ore mass ratio 6:1, and particle size <200 mesh), the extraction rate of chromium reached 99%, after reacting for 480 min. in comparison with the current liquid-phase oxidation technologies, the reaction temperature in the new approach is 150-250 degrees C lower, and the alkali concentration of the reaction medium is lower by more than 20%, showing substantial advantages in terms of energy efficiency, equipment corrosion alleviation and prospects for industrial application. The reaction kinetics study shows that the extraction process under optimal reaction conditions is jointly governed by surface chemical reaction and solid product layer diffusion with the apparent activation energy calculated to be 17.56 kJ/mol. (C) 2013 Elsevier Ltd. All rights reserved.
KeywordElectrochemical Chromite Ore Koh Sub-molten Salt
SubtypeArticle
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
DOI10.1016/j.mineng.2013.12.009
URL查看原文
Indexed BySCI
Language英语
WOS KeywordMANUFACTURING PROCESS ; POTASSIUM HYDROXIDE ; SODIUM CHROMATE ; ELECTRODE ; OXYGEN ; ELECTROOXIDATION ; THERMODYNAMICS ; SLURRIES ; KINETICS ; LITHIUM
WOS Research AreaEngineering ; Mineralogy ; Mining & Mineral Processing
WOS SubjectEngineering, Chemical ; Mineralogy ; Mining & Mineral Processing
WOS IDWOS:000331686700003
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/8088
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Texas El Paso, El Paso, TX 79968 USA
4.Seokyeong Univ, Seoul 136704, South Korea
Recommended Citation
GB/T 7714
Wang, Zhonghang,Du, Hao,Wang, Shaona,et al. Electrochemical enhanced oxidative decomposition of chromite ore in highly concentrated KOH solution[J]. MINERALS ENGINEERING,2014,57(1):16-24.
APA Wang, Zhonghang.,Du, Hao.,Wang, Shaona.,Zheng, Shili.,Zhang, Yi.,...&Jeong, Tae Eui.(2014).Electrochemical enhanced oxidative decomposition of chromite ore in highly concentrated KOH solution.MINERALS ENGINEERING,57(1),16-24.
MLA Wang, Zhonghang,et al."Electrochemical enhanced oxidative decomposition of chromite ore in highly concentrated KOH solution".MINERALS ENGINEERING 57.1(2014):16-24.
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