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<p>The Bayan Obo deposit in China has abundant scandium resources, and these scandium-containing materials are stored as tailings after recovery of iron concentrate. In this study, the distribution of scandium in specific minerals in the scandium-containing tailings of Bayan Obo is calculated by combining MLA and SEM results to provide effective guidance for subsequent scandium recovery. Scandium is mainly present in aegirine; it cannot be effectively leached by conventional acid leaching. The tailing was treated by reductive roasting with Na<sub>2</sub>CO<sub>3</sub> to separate iron and activate scandium. When the addition of Na<sub>2</sub>CO<sub>3</sub> was 10%, and the roasting temperature was 1100&#xa0;°C, the content and recovery of Fe in the magnetic product obtained by magnetic separation of the refined calcine were 90.03% and 82.60%, respectively. The recovery of scandium in the non-magnetic material was 97.95%. During reductive roasting, the scandium-containing phases like aegirine were decomposed, thus strengthening the acid-leaching property of scandium. The leaching of Sc was only 31.94% from tailings using 7.5&#xa0;mol/L H<sub>2</sub>SO<sub>4</sub> solution, which increased to 97.26% from non-magnetic materials in 2.0&#xa0;mol/L H<sub>2</sub>SO<sub>4</sub> solution. Besides, the low REE leaching ratio is conducive to their further recovery from the leaching residue.</p>

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Separation of Iron and Synergistic Reinforcement of Scandium Leaching from a Scandium-Containing Tailing Based on Reductive Roasting

  • 期刊论文

  • 发表日期：

    2025年2月3日

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  • Guanghui Li,
  • Ruyi Zhang,
  • Jun Luo,
  • Zhao Yang,
  • Changan Liu,
  • Suoyuan Dong,
  • Mingjun Rao

摘要

The Bayan Obo deposit in China has abundant scandium resources, and these scandium-containing materials are stored as tailings after recovery of iron concentrate. In this study, the distribution of scandium in specific minerals in the scandium-containing tailings of Bayan Obo is calculated by combining MLA and SEM results to provide effective guidance for subsequent scandium recovery. Scandium is mainly present in aegirine; it cannot be effectively leached by conventional acid leaching. The tailing was treated by reductive roasting with Na2CO3 to separate iron and activate scandium. When the addition of Na2CO3 was 10%, and the roasting temperature was 1100 °C, the content and recovery of Fe in the magnetic product obtained by magnetic separation of the refined calcine were 90.03% and 82.60%, respectively. The recovery of scandium in the non-magnetic material was 97.95%. During reductive roasting, the scandium-containing phases like aegirine were decomposed, thus strengthening the acid-leaching property of scandium. The leaching of Sc was only 31.94% from tailings using 7.5 mol/L H2SO4 solution, which increased to 97.26% from non-magnetic materials in 2.0 mol/L H2SO4 solution. Besides, the low REE leaching ratio is conducive to their further recovery from the leaching residue.