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Decomposition Mechanism of Scheelite based on Sodium Bisulfate Roasting

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Abstract

Recently, our research group proposed a new approach for converting calcium tungstate to tungsten trioxide via sodium bisulfate roasting, which has the potential to overcome the excessive water consumption associated with ion exchange technology and reduce excessive wastewater production. To investigate the mechanism of scheelite decomposition based on sodium bisulfate roasting, thermogravimetric analysis-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectrometry (SEM‒EDS) were used to systematically study the reaction course, phase transitions and kinetics of scheelite decomposition by sodium bisulfate roasting. The results of TG-DSC showed that when the temperature was T ≥ 50 °C, the crystal water was removed from NaHSO4·H2O, and NaHSO4·H2O was converted to NaHSO4. As the temperature increased to 120 °C ≤ T ≤ 270 °C, H+ was released from molten NaHSO4 and reacted with CaWO4 to generate H2WO4, which further decomposed into WO3 under the action of heat. When sodium bisulfate reacted with scheelite, a higher temperature and sodium bisulfate dosage were necessary to ensure that the molten sodium bisulfate destroyed the mineral lattice and fully contacted the CaWO4 in the mineral. XRD characterization results indicated that the primary products of scheelite after roasting with sodium bisulfate were WO3, CaSO4 and Na2SO4. A kinetic study showed that the sodium bisulfate roasting-induced scheelite decomposition reaction was in line with a kinetic equation for a first-order reaction, and the activation energy was 51.8 kJ·mol−1, suggesting that the reaction was controlled by a chemical reaction.

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Acknowledgements

We are sincerely grateful the Qingjiang Program for Young Talents of Jiangxi University of Science and Technology (JXUSTQJBJ2017004) and the Natural Science Foundation of Jiangxi Province (20202ACBL204002) for financial supports of our research.

Funding

This study was funded by the Qingjiang Program for Young Talents of Jiangxi University of Science and Technology (JXUSTQJBJ2017004) and the Natural Science Foundation of Jiangxi Province (20202ACBL204002).

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Authors and Affiliations

  1. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, No. 156 Kejia Avenue, Ganzhou, 341000, Jiangxi, China

    Luewei Xu, Yong Liang, Chao Huang, Bingxuan He & Degang Liu

  2. Chongyi Zhangyuan Tungsten Co., Ltd, Ganzhou, 343000, Jiangxi, China

    Guozuang Xu & Xin Zhang

Authors
  1. Luewei Xu
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  2. Yong Liang
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Contributions

LX: Writing—original manuscript and editing. YL: Methodology, funding acquisition and conceptualization. GX: Supervision. CH: Writing—review. BH: Writing—Data calculation, XZ: Validation. DL: Investigation.

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Correspondence to Yong Liang.

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The contributing editor for this article was M. Akbar Rhamdhani.

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Xu, L., Liang, Y., Xu, G. et al. Decomposition Mechanism of Scheelite based on Sodium Bisulfate Roasting. J. Sustain. Metall. 9, 1061–1074 (2023). https://doi.org/10.1007/s40831-023-00709-x

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