MnO含有スラグとFe-C-P-Si-S系溶鉄との反応速度

抄録

The kinetics of reaction between MnO based slag and Fe-C-P-Si-S alloy was examined at 1450°C and the results were analyzed using a kinetic model. MnO in the slag was found to be a good agent for desulfurization, and oxidation of other impurities in the iron alloys; Phosphorus and silicon present in the metal did not affect the rates of decarburization and desulfurization, but the reduction rate of MnO in the slag increased. Dephosphorization rate was more rapid with increasing the initial content of sulfur in the metal, while the rate was suppressed as the content of silicon in the metal increased. These results were well simulated by a kinetic model developed for a slag-metal reaction. The present modeling study suggested that decarburization was controlled by the chemical reaction at slag-metal interface, and the other reactions were controlled by the mass transports in slag and/or metal phases.