University of Oulu

Longjie Liu, Zhonghang Wang, Hao Du, Shili Zheng, Ulla Lassi, Yi Zhang, Intensified decomposition of vanadium slag via aeration in concentrated NaOH solution, International Journal of Mineral Processing, Volume 160, 2017, Pages 1-7, ISSN 0301-7516,

Intensified decomposition of vanadium slag via aeration in concentrated NaOH solution

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Author: Liu, Longjie1,2; Wang, Zhonghang1,2; Du, Hao1,2;
Organizations: 1Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
2University of Chinese Academy of Sciences, Beijing, 100049, China
3University of Oulu, FIN-90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
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Language: English
Published: Elsevier, 2017
Publish Date: 2019-11-27


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 °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 °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.

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Series: International journal of mineral processing
ISSN: 0301-7516
ISSN-E: 1879-3525
ISSN-L: 0301-7516
Volume: 160
Pages: 1 - 7
DOI: 10.1016/j.minpro.2017.01.003
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: The authors gratefully acknowledge the financial support from the Major State Basic Research Development Program of China (973 program) under grant No. 2013CB632601, National Natural Science Foundation of China under Grant Nos. 91634111 and 51404227.
Copyright information: © 2017 The Authors. Published by Elsevier Inc. This manuscript version is made available under the CC-BY-NC-ND 4.0 license