Modelling of dephosphorization in oxygen steelmaking

A dynamic model based on the chemical thermodynamics and kinetics of reactions occurring in three different zones has been developed to predict the compositional evolution of slag and metal in a top blown steelmaking process. The fundamental process phenomena such as metal droplet ejection, the reaction of droplets in the slag-metal emulsion, slag-metal-gas equilibria were successfully incorporated in the mathematical model. The simulation results provide a comprehensive insight by quantitatively evaluating the influence of process dynamics on refining behaviour of impurities. The gathered fundamental understanding with the predictive tool should find application in the advanced process control of a steel refining process.