Gas-based reduction of vanadium titano-magnetite concentrate:behavior and mechanisms

Yu-lei Sui; Yu-feng Guo; Tao Jiang; Xiao-lin Xie; Shuai Wang; Fu-qiang Zheng

doi:10.1007/s12613-017-1373-x

Volume 24 Issue 1

Jan. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(1): 10-17

Yu-lei Sui, Yu-feng Guo, Tao Jiang, Xiao-lin Xie, Shuai Wang, and Fu-qiang Zheng, Gas-based reduction of vanadium titano-magnetite concentrate:behavior and mechanisms, Int. J. Miner. Metall. Mater., 24(2017), No. 1, pp. 10-17. https://doi.org/10.1007/s12613-017-1373-x

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Yu-lei Sui, Yu-feng Guo, Tao Jiang, Xiao-lin Xie, Shuai Wang, and Fu-qiang Zheng, Gas-based reduction of vanadium titano-magnetite concentrate:behavior and mechanisms, Int. J. Miner. Metall. Mater., 24(2017), No. 1, pp. 10-17. https://doi.org/10.1007/s12613-017-1373-x

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Research Article

Gas-based reduction of vanadium titano-magnetite concentrate:behavior and mechanisms

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Corresponding author:
Yu-feng Guo E-mail: guoyufengcsu@163.com
Received: 8 April 2016; Revised: 5 September 2016; Accepted: 6 September 2016

Abstract

Abstract

The reduction of vanadium titano-magnetite pellets by H₂-CO at temperatures from 850 to 1050℃ was investigated in this paper. The influences of pre-oxidation treatment, reduction temperature, and V_H₂/(V_H₂ + V_CO) on the metallization degree were studied. The results showed that pre-oxidation played a substantial role in the reduction of vanadium titano-magnetite pellets. During the reduction process, the metallization degree increased with increasing temperature and increasing V_H₂/(V_H₂ + V_CO). The phase transformation of pre-oxidized vanadium titano-magnetite pellets during the reduction process under an H₂ atmosphere and a CO atmosphere was discussed, and the reduced samples were analyzed by scanning electron microscopy (SEM) in conjunction with back scatter electron (BSE) imaging. The results show that the difference in thermodynamic reducing ability between H₂ and CO is not the only factor that leads to differences in the reduction results obtained using different atmospheres. Some of Fe_3-xTi_xO₄ cannot be reduced under a CO atmosphere because of the densification of particles' structure and because of the enrichment of Mg in unreacted cores. By contrast, a loose structure of particles was obtained when the pellets were reduced under an H₂ atmosphere and this structure decreased the resistance to gas diffusion. Moreover, the phenomenon of Mg enrichment in unreacted cores disappeared during H₂ reduction. Both the lower resistance to gas diffusion and the lack of Mg enrichment facilitated the reduction of vanadium titano-magnetite.
- titano-magnetite;
- ore reduction;
- behavior;
- mechanisms

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