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Under the background of dual carbonCarbon goals, solid waste treatment and CO₂ utilization have become hot issues of global concern. To explore the resource utilization of steel slagSteel slag and waste gas, this paper proposed a research idea for preparing Fe–Si alloysFe-Si alloy and CaCO3 by molten saltMolten salt electrolysis of steel slagSteel slag in NaCl–KCl system under CO2 atmosphere. The theoretical feasibility was analyzed through thermodynamic calculations. The results showed that no chemical reactions occurred between components of steel slagSteel slag and molten saltMolten salt at 750–950 ℃. Electroreduction sequence of metals in the steel slagSteel slag was Fe, Si, Ca, and Al. Combined with the slag components and Fe–Si phase diagram, under a voltage of −2.21 to −1.51 V, the electroreduction of Fe and Si finally formed Fe3Si, FeSi2, FeSi, and Fe5Si3. As deoxidation proceeds, CaOCaO can be dissociated from the CaOCaO-containing phase in steel slagSteel slag, and then reacted with CO2 to form CaCO3. Under above thermodynamic conditions, it was theoretically feasible to prepare Fe–Si alloyFe–Si alloy and CaCO3 from molten saltMolten salt electrolytic steel slagSteel slag under CO2 atmosphere.

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Thermodynamic Analysis of Fe-Si Alloy and CaCO3 Prepared from Steel Slag by Molten Salt Electrolysis Under CO2 Atmosphere

  • 会议论文

  • 发表日期：

    2026年

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  • Pengzhen Li,
  • Ying Chen,
  • Bo Yuan,
  • Yan Wang,
  • Hongyan Yan

摘要

Under the background of dual carbonCarbon goals, solid waste treatment and CO₂ utilization have become hot issues of global concern. To explore the resource utilization of steel slagSteel slag and waste gas, this paper proposed a research idea for preparing Fe–Si alloysFe-Si alloy and CaCO3 by molten saltMolten salt electrolysis of steel slagSteel slag in NaCl–KCl system under CO2 atmosphere. The theoretical feasibility was analyzed through thermodynamic calculations. The results showed that no chemical reactions occurred between components of steel slagSteel slag and molten saltMolten salt at 750–950 ℃. Electroreduction sequence of metals in the steel slagSteel slag was Fe, Si, Ca, and Al. Combined with the slag components and Fe–Si phase diagram, under a voltage of −2.21 to −1.51 V, the electroreduction of Fe and Si finally formed Fe3Si, FeSi2, FeSi, and Fe5Si3. As deoxidation proceeds, CaOCaO can be dissociated from the CaOCaO-containing phase in steel slagSteel slag, and then reacted with CO2 to form CaCO3. Under above thermodynamic conditions, it was theoretically feasible to prepare Fe–Si alloyFe–Si alloy and CaCO3 from molten saltMolten salt electrolytic steel slagSteel slag under CO2 atmosphere.