关键词: CO₂, 炼钢, 资源化利用, 节能降耗

Abstract: Using CO₂ in steelmaking process can realize the utilization of CO₂ resources， which is a green， low cost， high efficiency and easy to achieve smelting technology. This article was based on the application of steelmaking CO₂ technology， the development and application of CO₂ in the converter and electric arc furnace in recent years were introduced. According to the domestic steel enterprises actual production situation， the practical effects of resource application of CO₂ in energy-saving， consumption reducing， and improving the quality of molten steel in steelmaking process were summarized. It also analyzed the current application status of CO₂ gas as reaction gas， stirring gas， etc. in steelmaking process. Application of CO₂ in steelmaking process had the advantages of lower cost， better thermodynamic conditions， stronger stirring ability， and higher gas calorific value， the application prospects can be very broad. The research results indicate that application of CO₂ in steelmaking process can increase the dephosphorization rate of molten iron by 5% to 7%， and save production costs of over 9 yuan per ton of steel. Resource application of CO₂ in steelmaking process will be one of the key research directions for achieving higher efficiency and lower cost emission reduction in China’s iron and steel industry. Based on an estimated annual output of crude steel of 1 billion tons in China， application of CO₂ in steelmaking process can reduce the total CO₂ emissions of the iron and steel industry about 5%.

Key words: CO₂, Steelmaking, Resource Application, Energy-saving and Consumption Reducing