Kinetics of Dephosphorization in Double Slag Converter Steelmaking Process at Different Temperatures With Industrial Experiments and Laboratorial Experiments

The kinetic model of dephosphorization (De-P) based on the coupled reaction model by combination with the heat balance temperature model and the lime dissolution model was used for the De-P stage in the double slag converter steelmaking process. At the different De-P temperatures, 220-ton industrial experiments and 0.5-kg laboratorial experiments were conducted. The predicted results are consistent with both the industrial results and the laboratorial results. In industrial experiments, with increasing temperature, the P removal ratio increases first and then decrease with the highest P removal ratio at the temperature of 1664 K. The De-P rate increases rapidly at first, then decreases after reaching the peak. At the peak of the De-P rate, the value of interfacial oxygen activity also increases to the peak. The peak value of De-P rate decreases with the increase in temperature. The De-P is a first-order reaction with the activation energy of 241,992.3 J mol −1 . The value of the mass transfer coefficient increases with the increasing temperature.