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Equilibrium between Carbon and FeO‐Containing Slag in CO–CO2–H2O Atmosphere by FactSage Calculation

High‐temperature steelmaking slags can act as not only heat carrier and catalyst, but also reactants in some chemical reactions to produce syngas due to the individual components in slags. A new method is put forward to utilize the thermal energy of steelmaking slag for coal reforming to generate CO and H2 gases which could be reused as energy. Thermodynamics of the reaction among carbon, FeO–CaO–SiO2 slag, and CO–CO2–H2O gas is studied by FactSage 6.3 under steady temperature condition. In addition, effects of slag composition, slag temperature, and added carbon amount upon the production of H2 and CO gases are clarified.