In this paper, examples of the use of a kinetic model in the analysis of a steelmaking process will be discussed. In decarburization by BOF, the relation between C and O contents is different from that obtained by equilibrium calculations. By the use of kinetic models, it was clarified that the O content in the metal is controlled not only by the C content but also by the FeO activity in the slag. In the vacuum degassing process, the partial pressure calculated on the basis of the relation between C and O contents is much higher than the operation pressure. The kinetic model which considers the circulation between the molten steel in the vacuum vessel and that in the ladle is well known; furthermore, various decarburization mechanisms were proposed. Hot metal dephosphorization occurs under non-equilibrium conditions because the oxygen potential of the slag and that of the hot metal are different. Process analysis is performed by considering the reaction kinetics based on the coupled reaction model. Recently, a new reaction model has been proposed; this model considers the solid slag, liquid slag, and liquid metal phases and the reaction between the solid and liquid slag, in addition to the reaction between the liquid slag and liquid metal.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Metals and Alloys
- Materials Chemistry