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Jun-yi Xiang, Xin Wang, Gui-shang Pei, Qing-yun Huang, and Xue-wei Lü, Solid-state reaction of a CaO−V2O5 mixture: A fundamental study for the vanadium extraction process, Int. J. Miner. Metall. Mater., 28(2021), No. 9, pp. 1462-1468. https://doi.org/10.1007/s12613-020-2136-7
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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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