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Solid-state reaction of a CaO-V2O5 mixture: A fundamental study for the vanadium extraction process

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Abstract

The aim of this study was to investigate the phase transformation and kinetics of the solid-state reaction of CaO-V2O5, which is the predominant binary mixture involved in the vanadium recovery process. Thermal analysis, X-ray diffraction spectroscopy, scanning electron microscopy, and energy dispersive spectrometry were used to characterize the solid-state reaction of the samples. The extent of the solid reaction was derived using the preliminary quantitative phase analysis of the X-ray patterns. The results indicate that the solid reaction of the CaO-V2O5 mixture is strongly influenced by the reaction temperature and CaO/V2O5 mole ratio. The transformation of calcium vanadate involves a step-by-step reaction of CaO-V2O5, CaO-CaV2O6, and CaO-Ca2V2O7 depending on the CaO/V2O5 mole ratio. The kinetic data of the solid reaction of the CaO-V2O5 (1:1) mixture followed a second-order reaction model. The activation energy (Ea) and preexponential factor (A) were determined to be 145.38 kJ/mol, and 3.67 × 108 min−1, respectively.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 52004044), the Natural Science Foundation of Chongqing, China (No. cstc2019jcyj-bshX0068), Chongqing Postdoctoral Innovation Program (No. CQBX201904), and the Open Project Founded by the State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization.

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Authors and Affiliations

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

    Jun-yi Xiang, Xin Wang, Gui-shang Pei & Xue-wei Lü

  2. School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China

    Qing-yun Huang

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

    Xue-wei Lü

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  1. Jun-yi Xiang
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  2. Xin Wang
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  3. Gui-shang Pei
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  4. Qing-yun Huang
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Correspondence to Jun-yi Xiang or Xue-wei Lü.

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Xiang, Jy., Wang, X., Pei, Gs. et al. Solid-state reaction of a CaO-V2O5 mixture: A fundamental study for the vanadium extraction process. Int J Miner Metall Mater 28, 1462–1468 (2021). https://doi.org/10.1007/s12613-020-2136-7

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  • DOI: https://doi.org/10.1007/s12613-020-2136-7

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