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<p>With the rapid advancement of technology and the increasing demand for gallium, coal gangue has emerged as a promising alternative source of this rare metal, attracting significant attention in gallium recovery research. This study investigates efficient methods for extracting gallium from coal gangue through roasting treatment and acid leaching. Roasting experiments identified 600&#xa0;°C as the optimal temperature, where the process involves the destruction of the mineral lattice and the enhancement of the pore structure, facilitating gallium release. Acid leaching experiments revealed that higher acid concentration and temperature significantly improve gallium recovery, with temperature being the most influential factor. Under optimal conditions (3&#xa0;M HCl, 90&#xa0;°C, 20&#xa0;g/L solid-to-liquid ratio, and 180&#xa0;min reaction time), gallium recovery reached 82%. Additionally, response surface analysis confirmed the accuracy of the predictive model, providing a theoretical foundation and practical guidance for the efficient and sustainable recovery of gallium from coal gangue.</p>

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Effect of Low-temperature Roasting on Gallium Extraction Efficiency from Coal Gangue: Mechanisms and Optimization

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • Jingzheng Wang,
  • Hongxiang Xu,
  • Yijun Cao,
  • Biao Fu,
  • Lin Ma,
  • Shenghao Xu,
  • Manjiang Xie,
  • Hangxin Lei,
  • Jiushuai Deng

摘要

With the rapid advancement of technology and the increasing demand for gallium, coal gangue has emerged as a promising alternative source of this rare metal, attracting significant attention in gallium recovery research. This study investigates efficient methods for extracting gallium from coal gangue through roasting treatment and acid leaching. Roasting experiments identified 600 °C as the optimal temperature, where the process involves the destruction of the mineral lattice and the enhancement of the pore structure, facilitating gallium release. Acid leaching experiments revealed that higher acid concentration and temperature significantly improve gallium recovery, with temperature being the most influential factor. Under optimal conditions (3 M HCl, 90 °C, 20 g/L solid-to-liquid ratio, and 180 min reaction time), gallium recovery reached 82%. Additionally, response surface analysis confirmed the accuracy of the predictive model, providing a theoretical foundation and practical guidance for the efficient and sustainable recovery of gallium from coal gangue.