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Oxidation Mechanism of Vanadium Slag with High MgO Content at High Temperature

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Abstract

Based on two considerations of making full use of the residual heat of vanadium slag and exploring a novel green vanadium extraction process, this article employs vanadium slag with high MgO content as raw material, blowing oxygen into the molten vanadium slag and using the residual heat of the vanadium slag to carry out high-temperature roasting experiments. XRD and SEM/EDS were used to characterize the phase evolution and morphology of vanadium slag with high MgO content during oxidation. The results show that at a high temperature of 1723 K, the trivalent vanadium in vanadium slag can be partly transformed into acid-soluble pentavalent vanadium. Titanium-bearing spinel was oxidized into a large amount of strip pseudobrookite Fe2TiO5. After oxidation, vanadium existed in the form of the solid solution of magnesium pyrovanadate (Mg, Mn, Ca)2V2O7. The leaching rate of roasted vanadium slag with high MgO content is significantly higher than that of industrial vanadium slag. With the increase of oxygen blowing time from 10 to 30 minutes, the leaching rate of roasted vanadium slag with high MgO content increases from 23.19 to 53.69 pct.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 51974047) and Natural Science Foundation of Chongqing, China (No. cstc2020jcyj-msxmX0043).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, P.R. China

    Jiang Diao, Liang Liu, Jing Lei, Wen-Feng Tan, Hong-Yi Li & Bing Xie

  2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials, Chongqing University, Chongqing, 400044, P.R. China

    Liang Liu, Jing Lei, Wen-Feng Tan, Hong-Yi Li & Bing Xie

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  1. Jiang Diao
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  2. Liang Liu
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Manuscript submitted July 22, 2020. Accepted October 4, 2020.

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Diao, J., Liu, L., Lei, J. et al. Oxidation Mechanism of Vanadium Slag with High MgO Content at High Temperature. Metall Mater Trans B 52, 494–501 (2021). https://doi.org/10.1007/s11663-020-02000-w

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  • DOI: https://doi.org/10.1007/s11663-020-02000-w

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