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Traditional acid leaching and Na2CO3 high-pressureSynergistic leaching leaching processes of low-grade scheeliteScheelite (CaWO4) face challenges like high energy consumption and impurity dissolution. This study investigates the enhanced alkaline leaching of low-grade scheeliteScheelite using NaOH-Na2CO3 synergy and in-depth characterizationCharacterization of the changes in the material during the leaching process. Optimal conditions achieved a 90.41% WO3 leaching rate within 2h at 180 °C, a liquid-to-solid ratio of 5, an alkali concentration of 170 g/L, and a mass ratio of NaOH to Na2CO3 of 1:32. X-ray diffraction (XRD) analysis revealed distinct phase transformationsPhase transformation during leaching, while residueResidue characterization characterizationCharacterization with Fourier transform infrared spectroscopy (FTIR)Fourier Transform Infrared spectroscopy (FTIR) revealed the ionic competitive interaction between WO42− and CO32−. Scanning electron microscopy and energy dispersive spectrometerScanning Electron Microscopy (SEM) (SEM–EDS) confirmed that NaOH could promote the leaching of Na2CO3 on scheeliteScheelite. This work establishes structure–activity relationships through multi-scale characterizationCharacterization, enabling efficient low-grade scheeliteScheelite processing.

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Unraveling the Synergistic Leaching of Low-Grade Scheelite in NaOH–Na2CO3: Insights from Advanced Material Characterization

  • 会议论文

  • 发表日期：

    2026年

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  • Xinran Li,
  • Hao Jiang,
  • Zhiwei Peng,
  • Anan Duan,
  • Tong Zhang,
  • Zexi Gong

摘要

Traditional acid leaching and Na2CO3 high-pressureSynergistic leaching leaching processes of low-grade scheeliteScheelite (CaWO4) face challenges like high energy consumption and impurity dissolution. This study investigates the enhanced alkaline leaching of low-grade scheeliteScheelite using NaOH-Na2CO3 synergy and in-depth characterizationCharacterization of the changes in the material during the leaching process. Optimal conditions achieved a 90.41% WO3 leaching rate within 2h at 180 °C, a liquid-to-solid ratio of 5, an alkali concentration of 170 g/L, and a mass ratio of NaOH to Na2CO3 of 1:32. X-ray diffraction (XRD) analysis revealed distinct phase transformationsPhase transformation during leaching, while residueResidue characterization characterizationCharacterization with Fourier transform infrared spectroscopy (FTIR)Fourier Transform Infrared spectroscopy (FTIR) revealed the ionic competitive interaction between WO42− and CO32−. Scanning electron microscopy and energy dispersive spectrometerScanning Electron Microscopy (SEM) (SEM–EDS) confirmed that NaOH could promote the leaching of Na2CO3 on scheeliteScheelite. This work establishes structure–activity relationships through multi-scale characterizationCharacterization, enabling efficient low-grade scheeliteScheelite processing.