Static model for converter steelmaking with limestone

Converter steelmaking with limestone instead of lime was studied. The theoretical feasibility of using limestone instead of lime was analyzed for converter steelmaking. A partition model for carbon dioxide reaction with[C], [Si], [Mn] and [Fe] was established on the basis of thermodynamic analysis. According to the mass and heat balance calculations, the materials consumptions under different limestone substitution proportions were obtained, and the maximum limestone substituting proportion was determined. The changes of converter gas composition and production and the cost of steelmaking were studied. The results showed that limestone can be used in converter steelmaking and the maximum substitution proportion is about 71% under the involved conditions. With the increase of limestone substitution, the scrap consumption, volume fraction of CO₂ in furnace gas and the steelmaking cost decrease, while the hot metal consumption, volume fraction of CO in furnace gas and the quality of furnace gas increase.