Thermodynamic Evaluation of Enhanced CO2 Conversion in Innovative Slag Splashing Processes in Converters

The innovative slag splashing technique enhances the recycling of CO₂ in the steel industry. However, thermodynamic experiments overestimate CO₂ conversion because the temperature drop in the process is not taken into account. Therefore, FactSage is employed to reevaluate it. Calculations are validated by comparison with experiments. It is found that employing CO₂ for the slag splashing process leads to a decrease in equilibrium temperature. Increasing the carbon addition enhances CO generation and CO₂ conversion but results in a further reduced temperature. Elevating the temperatures of the slag and CO₂ has no effect on CO generation and CO₂ conversion. However, it proves beneficial for increasing the equilibrium temperature. As the most effective measure, increasing the FeO content in the slag improves CO₂ conversion while significantly lowering the slag solid fraction. When the initial FeO content is 17.24 mass%, the initial temperature is 1873 K, and the CO₂ temperature is 300 K, the optimal carbon addition is 1.5 mass%. By increasing the slag and CO₂ temperatures and elevating the initial FeO content, the carbon addition can reach 3.0 mass%, and CO₂ conversion reaches 53.29%.