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For efficient production of magnesiumMagnesium (Mg) metal from ferronickel slagFerronickel slag via molten salt electrolysisMolten salt electrolysis, the solubilitySolubility and electrochemical behavior of magnesiumMagnesium orthosilicate (Mg2SiO4) in magnesiumMagnesium fluoride (MgF2)–lithium fluoride (LiF) molten saltMolten salt at 1053 K were investigated. The experimental results indicate that the solubilitySolubility of Mg2SiO4 reached saturation at approximately 0.26 mass% after 5 h. Cyclic voltammetryCyclic Voltammetry (CV) measurements using a graphite working electrode, a platinum (Pt) quasi-reference electrode, and a graphite counter electrode revealed the preferential electro-reductionReduction of silicate ion over magnesiumMagnesium ion (Mg2+), and siliconSilicon (Si) metal was produced when −1.35 V (vs. Pt quasi-ref.) was applied for 0.5 h. Moreover, when electrolysisElectrolysis was conducted at 1053 K using a graphite cathode and a graphite anode under 1.62 V for 14 h, magnesium oxideMagnesium oxide (MgO) was observed along with Si metal. These results indicate that the production of Mg metal from Mg2SiO4 is feasible through the selective electro-reductionReduction of silicate ions, followed by electrolysisElectrolysis of the resulting MgO.

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Investigation of Molten Salt Electrolysis of Ferronickel Slag for Producing Mg Metal

  • 会议论文

  • 发表日期：

    2026年

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  • Hyeong-Jun Jeoung,
  • Jungshin Kang

摘要

For efficient production of magnesiumMagnesium (Mg) metal from ferronickel slagFerronickel slag via molten salt electrolysisMolten salt electrolysis, the solubilitySolubility and electrochemical behavior of magnesiumMagnesium orthosilicate (Mg2SiO4) in magnesiumMagnesium fluoride (MgF2)–lithium fluoride (LiF) molten saltMolten salt at 1053 K were investigated. The experimental results indicate that the solubilitySolubility of Mg2SiO4 reached saturation at approximately 0.26 mass% after 5 h. Cyclic voltammetryCyclic Voltammetry (CV) measurements using a graphite working electrode, a platinum (Pt) quasi-reference electrode, and a graphite counter electrode revealed the preferential electro-reductionReduction of silicate ion over magnesiumMagnesium ion (Mg2+), and siliconSilicon (Si) metal was produced when −1.35 V (vs. Pt quasi-ref.) was applied for 0.5 h. Moreover, when electrolysisElectrolysis was conducted at 1053 K using a graphite cathode and a graphite anode under 1.62 V for 14 h, magnesium oxideMagnesium oxide (MgO) was observed along with Si metal. These results indicate that the production of Mg metal from Mg2SiO4 is feasible through the selective electro-reductionReduction of silicate ions, followed by electrolysisElectrolysis of the resulting MgO.