Effect of CaF₂ Addition, Temperature, Basicity and Lime Diameter on The Rate of Hot Metal Dephosphorization

Abstract

To clarify the optimum dephosphorization condition with CaF₂ less fluxes, laboratory experiments were performed. The effect of CaF₂ addition, CaO diameter, temperature and slag basicity on the rate of hot metal dephosphorization were evaluated. Addition of small amount of CaF₂ drastically increased the rate of dephosphorization. This effect was attributed to the decrease in solid fraction of slag. At the conditions of the target basicity of 2.0 and using powder CaO, optimum temperature range was observed. At low temperature condition of 1270 °C, lower rate of dephosphorization was obtained. These phenomena are attributed to the loss of slag fluidity.