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Intensified decomposition of vanadium slag via aeration in concentrated NaOH solution
Liu, Longjie1,2; Wang, Zhonghang1,2; Du, Hao1,2; Zheng, Shili1; Lassi, Ulla3; Zhang, Yi1

A new metallurgical process via aeration for the decomposition of vanadium slag in concentrated NaOH solution was proposed. The improvement of oxygen mass transfer coefficient when using aeration at different NaOH concentration was studied and the effects of critical reaction parameters on vanadium extraction were systematically investigated. The optimal condition was determined to be: alkali concentration of 60%, reaction temperature of 130 degrees C, alkali-to-ore mass ratio of 6:1, stirring speed of 500 rpm. The yield of vanadium could reach to 97.41% after reacting for 6 h under this reaction condition. The reaction temperature in this new method is 50-270 degrees C lower than the current liquid oxidation methods reported in the literatures, and the medium alkaline concentration declined from 85% to 60%, exhibiting significant advantages in energy consumption as well as reactor design. Kinetics study indicated that the extraction of vanadium was governed by internal diffusion, and the apparent activation energy was calculated to be 17.57 kJ/mol. (C) 2017 Elsevier B.V. All rights reserved.

KeywordVanadium Slag Extraction Aeration System Oxygen Mass Transfer
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
Indexed BySCI
WOS KeywordAqueous-solutions ; Waste-water ; Oxygen-transfer ; Micro-bubbles ; Mass-transfer ; Microbubble ; Generation ; Kinetics ; Solubilities ; Mechanism
WOS Research AreaEngineering ; Mineralogy ; Mining & Mineral Processing
WOS SubjectEngineering, Chemical ; Mineralogy ; Mining & Mineral Processing
Funding OrganizationMajor State Basic Research Development Program of China (973 program)(2013CB632601) ; National Natural Science Foundation of China(91634111 ; 51404227)
WOS IDWOS:000395607600001
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Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Oulu, FIN-90014 Oulu, Finland
Recommended Citation
GB/T 7714
Liu, Longjie,Wang, Zhonghang,Du, Hao,et al. Intensified decomposition of vanadium slag via aeration in concentrated NaOH solution[J]. INTERNATIONAL JOURNAL OF MINERAL PROCESSING,2017,160:1-7.
APA Liu, Longjie,Wang, Zhonghang,Du, Hao,Zheng, Shili,Lassi, Ulla,&Zhang, Yi.(2017).Intensified decomposition of vanadium slag via aeration in concentrated NaOH solution.INTERNATIONAL JOURNAL OF MINERAL PROCESSING,160,1-7.
MLA Liu, Longjie,et al."Intensified decomposition of vanadium slag via aeration in concentrated NaOH solution".INTERNATIONAL JOURNAL OF MINERAL PROCESSING 160(2017):1-7.
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