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<p>Mn-extracted slag occupies valuable arable land and pollutes the environment. To address these issues, developing efficient recycling and utilization approaches for Mn-extracted slag is imperative. This study explored a new method for the synthesis of amorphous nanostructured Fe<sub>2</sub>O<sub>3</sub> from Mn-extracted slag. The method involved extracting Fe from Mn-extracted slag via H<sub>2</sub>SO<sub>4</sub> roasting, followed by water leaching. Subsequently, Fe<sub>2</sub>O<sub>3</sub> was synthesized using a microwave hydrothermal method. The influence of roasting conditions on Fe extraction was clarified. Under optimal conditions (acid:material mass ratio 4:1, roasting temperature 565°C, water:acid volume ratio 0.6:1, and roasting time 2&#xa0;h), the Fe extraction rate exceeded 97% and the SiO<sub>2</sub> mass fraction in the Fe-extracted slag was 98.50%. The phase compositions and internal structures of roasting clinker, Fe-extracted slag, and Fe<sub>2</sub>O<sub>3</sub> product were investigated. The prepared Fe<sub>2</sub>O<sub>3</sub> sample exhibited a large specific surface area and remarkable electrochemical performance in supercapacitors. Overall, the proposed new process route for recovering metals from waste slag to produce Fe<sub>2</sub>O<sub>3</sub> materials demonstrates rapid reaction speeds, high recovery rates, and cost-effectiveness. Therefore, it provides technological and theoretical support for the efficient utilization of Mn-extracted slag.</p>

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Preparation of Amorphous Nano-Fe2O3 from Mn-Extracted Slag and Analysis of Its Electrochemical Performance in Supercapacitors

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Fei Teng,
  • Shaohua Luo,
  • Wenning Mu,
  • Qiuyue Liu,
  • Xuefei Lei,
  • Huanhuan Chen,
  • Yujun Xu

摘要

Mn-extracted slag occupies valuable arable land and pollutes the environment. To address these issues, developing efficient recycling and utilization approaches for Mn-extracted slag is imperative. This study explored a new method for the synthesis of amorphous nanostructured Fe2O3 from Mn-extracted slag. The method involved extracting Fe from Mn-extracted slag via H2SO4 roasting, followed by water leaching. Subsequently, Fe2O3 was synthesized using a microwave hydrothermal method. The influence of roasting conditions on Fe extraction was clarified. Under optimal conditions (acid:material mass ratio 4:1, roasting temperature 565°C, water:acid volume ratio 0.6:1, and roasting time 2 h), the Fe extraction rate exceeded 97% and the SiO2 mass fraction in the Fe-extracted slag was 98.50%. The phase compositions and internal structures of roasting clinker, Fe-extracted slag, and Fe2O3 product were investigated. The prepared Fe2O3 sample exhibited a large specific surface area and remarkable electrochemical performance in supercapacitors. Overall, the proposed new process route for recovering metals from waste slag to produce Fe2O3 materials demonstrates rapid reaction speeds, high recovery rates, and cost-effectiveness. Therefore, it provides technological and theoretical support for the efficient utilization of Mn-extracted slag.