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<p>Gallium in brown corundum dust has recovery and utilization value. This study focused on gallium separation using a tributyl phosphate (TBP) + n-decanol(De) organic system from a hydrochloric acid leachate derived from brown corundum dust. The results showed that adding n-decanol eliminated the formation of a third phase during TBP extraction and promoted gallium extraction. The slope method identified the complex as HGaCl<sub>4</sub>TBP<sub>2</sub>De<sub>0.66</sub>. Thermodynamic studies confirmed that the extraction reaction was endothermic. Loading capacity experiments determined that 24&#xa0;vol.% TBP had a gallium-loading capacity of 22.66&#xa0;g/L. The optimal conditions for extracting gallium from the acid leachate were determined to be 24&#xa0;vol.% TBP, a TBP-to-n-decanol volume ratio of 3/2, and a phase ratio (O/A) of 1:1, achieving a single-stage gallium extraction rate of 88.66%. For the loaded gallium, a single-stage stripping rate of 92.74% was obtained using 1.25&#xa0;mol/L NaOH at 35°C for 5&#xa0;min. The addition of oxalic acid effectively inhibited iron co-extraction. Under conditions of 32&#xa0;g/L oxalic acid, the iron extraction rate was only 19.07%. After extraction-stripping operations, most impurities (Al, Si, Ca, and Fe) were separated from Ga with removal rates of 97.91%, 90.02%, 98.02%, and 93.86%, respectively.</p>

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Separation of Gallium from Acid Leachate of Roasting-Activated Brown Corundum Dust

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Zihao Li,
  • Juhua Zhang

摘要

Gallium in brown corundum dust has recovery and utilization value. This study focused on gallium separation using a tributyl phosphate (TBP) + n-decanol(De) organic system from a hydrochloric acid leachate derived from brown corundum dust. The results showed that adding n-decanol eliminated the formation of a third phase during TBP extraction and promoted gallium extraction. The slope method identified the complex as HGaCl4TBP2De0.66. Thermodynamic studies confirmed that the extraction reaction was endothermic. Loading capacity experiments determined that 24 vol.% TBP had a gallium-loading capacity of 22.66 g/L. The optimal conditions for extracting gallium from the acid leachate were determined to be 24 vol.% TBP, a TBP-to-n-decanol volume ratio of 3/2, and a phase ratio (O/A) of 1:1, achieving a single-stage gallium extraction rate of 88.66%. For the loaded gallium, a single-stage stripping rate of 92.74% was obtained using 1.25 mol/L NaOH at 35°C for 5 min. The addition of oxalic acid effectively inhibited iron co-extraction. Under conditions of 32 g/L oxalic acid, the iron extraction rate was only 19.07%. After extraction-stripping operations, most impurities (Al, Si, Ca, and Fe) were separated from Ga with removal rates of 97.91%, 90.02%, 98.02%, and 93.86%, respectively.