A KINETIC-MODEL APPLIED TO THE MOLTEN PIG-IRON DESULFURIZATION BY INJECTION OF LIME-BASED POWDERS

A kinetic model of hot-metal desulfurization by deep injection of synt hetic powder mixtures is presented. The approach takes into considerat ion the transient contribution due to the particles dispersed in the b ulk metal and those located at the bubble-metal interface, the influen ce of the carry-over slag as well as the volume and composition of the top slag. The model has been utilized to assess the influence of the treatment temperature, rate of injection of powder mixtures, gas flow rate and initial concentration of sulphur over the desulfurization kin etics. In the second part of this study an analysis of the industrial data for injection of powder mixtures using this model is described.