Production of H ₂ and CO via H ₂ O–CO ₂ Oxidation of FeO‐Bearing Steel Slag Under Varied Basicity and Al ₂ O ₃ Conditions

The utilization of clean energy carriers such as hydrogen (H 2 ) and the reduction of greenhouse gas carbon dioxide (CO 2 ) have garnered widespread research attention. This study explores a novel approach that utilizes waste heat from steel slag to drive the H 2 O–CO 2 oxidation of FeO‐bearing slag. This process not only promotes the generation of gaseous H 2 and CO but also facilitates the oxidation of Fe 2+ to Fe 3+ . The CaO–SiO 2 –FeO slag system was used as the base, with variations in slag basicity and Al 2 O 3 content. A mixture of H 2 O, CO 2 , and Ar was introduced to investigate its reaction behavior with the FeO‐containing slag. Based on FactSage thermodynamic simulations, mass spectrometric analysis of gas products, and chemical composition analysis of the slag, it was found that in the H 2 O–CO 2 –Ar atmosphere system, the optical basicity of the slag increased to 0.64–0.67, which is conducive to the reaction. Accordingly, the gas production rate increased from 1.38 × 10 −6 mol/s to 3.05 × 10 −6 mol/s under the H 2 O–CO 2 mixed atmosphere. The influence of Al 2 O 3 on the reaction was more complex. As the Al 2 O 3 content increased from 0% to 25%, the total gas production initially increased, reaching a maximum of 9.44 × 10 −6 mol/s at 10% Al 2 O 3 , before gradually decreasing.