Kinetic Evolution of the Composition of Desulfurizers in the Molten Steel During RH Refining Process

The addition of desulfurizerDesulfurizer particles to the molten steelSteel resulted in a noticeable change in the composition of desulfurizersDesulfurizer. This study aimed to establish a kineticKinetics model based on the unreacted-core model to predict the quantitative evolution of desulfurizersDesulfurizer composition. The original composition of the desulfurizerDesulfurizer was CaO–SiO2–CaF2. Effects of the content of dissolved magnesiumMagnesium [Mg] on the composition evolution of desulfurizersDesulfurizer were determined. Once added to the steelSteel, a rapid displacement reaction occurred between the SiO2 in the desulfurizerDesulfurizer and the dissolved aluminumAluminum in the molten steelSteel. Consequently, the SiO2 content in the desulfurizerDesulfurizer decreased from 19.5 to below 2% within 90 s, while the Al2O3 content increased from zero to over 20%. The study confirmed that as the [Mg] content increased from 1 to 15 ppm, the MgOMgO content in the desulfurizerDesulfurizer increased from 0.6 to 9.1% after 900 s of reaction.