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<p>Gallium and vanadium are critical rare metals with various applications. Their extraction from Bayer liquor is challenging due to low concentrations and complex compositions. In this study, we selected LSC-600 resin as the adsorbent and developed a process for selectively adsorbing and desorbing gallium and vanadium from Bayer liquor under optimized conditions. Using analysis of variance (ANOVA), we simulated the resin’s adsorption efficiency in Bayer liquor, with results showing adsorption rates of 93.37% for gallium and 91.7% for vanadium. The adsorption behavior of gallium and vanadium closely follows the Langmuir isotherm model, and the kinetics align with a quasi-second-order model. Thermodynamic analysis further indicated that the adsorption of gallium and vanadium occurs spontaneously. The adsorption mechanism was investigated by XPS and FTIR spectroscopy, and the role of resin amidoxime groups in the reaction process was understood in detail. Finally, a strategy combining aqueous washing and stepwise desorption was proposed for the efficient separation of aluminum, gallium, and vanadium. This method not only facilitates the recovery of these elements but also minimizes vanadium waste, laying the foundation for the recovery of subsequent elements.</p>

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Study on the Adsorption Mechanism and Desorption Process of Gallium and Vanadium in Practical Bayer Liquor by Amidoxime Porous Resin

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • Lingyu Qu,
  • Laishi Li,
  • Yusheng Wu,
  • Feng Liu,
  • Yuzheng Wang

摘要

Gallium and vanadium are critical rare metals with various applications. Their extraction from Bayer liquor is challenging due to low concentrations and complex compositions. In this study, we selected LSC-600 resin as the adsorbent and developed a process for selectively adsorbing and desorbing gallium and vanadium from Bayer liquor under optimized conditions. Using analysis of variance (ANOVA), we simulated the resin’s adsorption efficiency in Bayer liquor, with results showing adsorption rates of 93.37% for gallium and 91.7% for vanadium. The adsorption behavior of gallium and vanadium closely follows the Langmuir isotherm model, and the kinetics align with a quasi-second-order model. Thermodynamic analysis further indicated that the adsorption of gallium and vanadium occurs spontaneously. The adsorption mechanism was investigated by XPS and FTIR spectroscopy, and the role of resin amidoxime groups in the reaction process was understood in detail. Finally, a strategy combining aqueous washing and stepwise desorption was proposed for the efficient separation of aluminum, gallium, and vanadium. This method not only facilitates the recovery of these elements but also minimizes vanadium waste, laying the foundation for the recovery of subsequent elements.