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<p>To develop a CO<sub>2</sub>-free process for the direct production of Fe from Fe ore, the molten oxide electrolysis (MOE) of Fe oxides and ores was investigated in a B<sub>2</sub>O<sub>3</sub> – Na<sub>2</sub>O molten oxide at 1173&#xa0;K. Thermodynamic calculations and cyclic voltammetry measurements were performed to identify the electrochemical reduction behavior of the selected oxides. In addition, electrolysis was conducted by applying a cell voltage of 1.6&#xa0;V in air or Ar gas atmosphere. When electrolysis was carried out in air, current efficiencies ranging from 65.50 – 68.72% were obtained, depending on the type of Fe oxide used, whereas electrolysis in an Ar gas atmosphere showed higher current efficiencies of 67.49 – 78.56% owing to the suppressed re-oxidation of reduced Fe under a low <i>p</i><sub>O2</sub>. Furthermore, electrolysis using hematite, goethite, and magnetite in air produced Fe metal with current efficiencies of 64.14%, 66.00%, and 67.58%, respectively. These results demonstrated the feasibility of the low-temperature MOE of Fe ores in a B<sub>2</sub>O<sub>3</sub> – Na<sub>2</sub>O molten oxide for direct and CO<sub>2</sub>-free production of Fe.</p>

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Production of Fe metal from Fe ores through novel molten oxide electrolysis at 1173 K

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月7日

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  • Joongseok Kim,
  • Jungshin Kang,
  • Kyung-Woo Yi

摘要

To develop a CO2-free process for the direct production of Fe from Fe ore, the molten oxide electrolysis (MOE) of Fe oxides and ores was investigated in a B2O3 – Na2O molten oxide at 1173 K. Thermodynamic calculations and cyclic voltammetry measurements were performed to identify the electrochemical reduction behavior of the selected oxides. In addition, electrolysis was conducted by applying a cell voltage of 1.6 V in air or Ar gas atmosphere. When electrolysis was carried out in air, current efficiencies ranging from 65.50 – 68.72% were obtained, depending on the type of Fe oxide used, whereas electrolysis in an Ar gas atmosphere showed higher current efficiencies of 67.49 – 78.56% owing to the suppressed re-oxidation of reduced Fe under a low pO2. Furthermore, electrolysis using hematite, goethite, and magnetite in air produced Fe metal with current efficiencies of 64.14%, 66.00%, and 67.58%, respectively. These results demonstrated the feasibility of the low-temperature MOE of Fe ores in a B2O3 – Na2O molten oxide for direct and CO2-free production of Fe.