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<p>In industry, scandium is commonly separated and extracted from chlorinated dust via hydrochloric acid leaching followed by solvent extraction. However, emulsification of the organic phase during extraction reduces scandium recovery and disrupts normal production. Although a mixed sulfuric acid-hydrofluoric acid solution effectively demulsifies scandium-containing emulsions, fluoride entering the organic phase negatively impacts existing production lines. This study characterized fluorine species in the demulsified organic phase and achieved scandium recovery via hydrochloric acid stripping. During demulsification, D2EHPA extracted fluoride through complexation with loaded metal ions, while TBP retained fluoride via hydrogen bonding with neutral HF molecules. Using 1.0 mol/L hydrochloric acid as the stripping agent at room temperature, with a stripping time of 5 min and an O/A ratio of 1:1, 99.2% of scandium was stripped after four-stage countercurrent stripping. Selective precipitation of scandium from the hydrochloric acid stripping liquor using oxalic acid gave a scandium precipitation efficiency of 98.2% at pH 1.0, 85&#xa0;°C, and an oxalic acid dosage of 1.2 times the theoretical amount. After calcination, the scandium oxalate precipitate was converted to scandium oxide with a Sc<sub>2</sub>O<sub>3</sub> purity exceeding 98.70%.</p> Graphical Abstract <p></p>

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Scandium Recovery from Post-demulsification Organic Phase

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Chaoyi Tian,
  • Guoqi Zhang,
  • Qiuxiang Liu,
  • Mingyu Wang,
  • Guiqing Zhang,
  • Qinggang Li,
  • Wenjuan Guan,
  • Shengxi Wu,
  • XinSheng Wu

摘要

In industry, scandium is commonly separated and extracted from chlorinated dust via hydrochloric acid leaching followed by solvent extraction. However, emulsification of the organic phase during extraction reduces scandium recovery and disrupts normal production. Although a mixed sulfuric acid-hydrofluoric acid solution effectively demulsifies scandium-containing emulsions, fluoride entering the organic phase negatively impacts existing production lines. This study characterized fluorine species in the demulsified organic phase and achieved scandium recovery via hydrochloric acid stripping. During demulsification, D2EHPA extracted fluoride through complexation with loaded metal ions, while TBP retained fluoride via hydrogen bonding with neutral HF molecules. Using 1.0 mol/L hydrochloric acid as the stripping agent at room temperature, with a stripping time of 5 min and an O/A ratio of 1:1, 99.2% of scandium was stripped after four-stage countercurrent stripping. Selective precipitation of scandium from the hydrochloric acid stripping liquor using oxalic acid gave a scandium precipitation efficiency of 98.2% at pH 1.0, 85 °C, and an oxalic acid dosage of 1.2 times the theoretical amount. After calcination, the scandium oxalate precipitate was converted to scandium oxide with a Sc2O3 purity exceeding 98.70%.

Graphical Abstract