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Climate change caused by CO2 emissions is one of the most severe challenges. Research on CO2 captureCO2 capture has received widespread attention. To achieve low-cost capture of CO2, an innovative path for capture of CO2 by steel slagSteel slag/molten saltMolten salt was proposed. The thermodynamic behavior of synergistic capture of CO2 by steel slagSteel slag/molten saltMolten salt was theoretically analyzed. The results showed that below 1000 ℃, molten saltsMolten salt and all phases in steel slagSteel slag reacted chemically with CO2, and the reaction order from 600 to 1000 ℃ was Na2O > K2O > Li2O > CaO > Ca2SiO4 > Ca2Fe2O5 > MgO > FeO > CaAl2Si2O8. The conversion temperature of CO2 captureCO2 capture by each phase in steel slagSteel slag was between 200 and 900 ℃, and the conversion temperature of CO2 captureCO2 capture in molten saltMolten salt was higher than steel slagSteel slag. With the increase of CO2 partial pressure, conversion temperature increased. Under above thermodynamic conditions, steel slagSteel slag captured 33.3 g of CO2 per 100 g in theory, Ca2SiO4 in steel slagSteel slag had the best capture effect.

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Thermodynamic Study on CO2 Capture by Steel Slag/Molten Salt

  • 会议论文

  • 发表日期：

    2025年

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  • Yan Wang,
  • Hongyan Yan,
  • Bo Yuan,
  • Yang Liu

摘要

Climate change caused by CO2 emissions is one of the most severe challenges. Research on CO2 captureCO2 capture has received widespread attention. To achieve low-cost capture of CO2, an innovative path for capture of CO2 by steel slagSteel slag/molten saltMolten salt was proposed. The thermodynamic behavior of synergistic capture of CO2 by steel slagSteel slag/molten saltMolten salt was theoretically analyzed. The results showed that below 1000 ℃, molten saltsMolten salt and all phases in steel slagSteel slag reacted chemically with CO2, and the reaction order from 600 to 1000 ℃ was Na2O > K2O > Li2O > CaO > Ca2SiO4 > Ca2Fe2O5 > MgO > FeO > CaAl2Si2O8. The conversion temperature of CO2 captureCO2 capture by each phase in steel slagSteel slag was between 200 and 900 ℃, and the conversion temperature of CO2 captureCO2 capture in molten saltMolten salt was higher than steel slagSteel slag. With the increase of CO2 partial pressure, conversion temperature increased. Under above thermodynamic conditions, steel slagSteel slag captured 33.3 g of CO2 per 100 g in theory, Ca2SiO4 in steel slagSteel slag had the best capture effect.