Physical-chemical regularities of steel refining from non-metallic inclusions https://doi.org/10.33108/visnyk_tntu2018.01.072

Abstract

Using the thermodynamic analysis, the possibility of a colloid interaction of the dispersed phase with a dispersed medium, the possibility of coagulation of the non-metallic phase, has been determined. It
is established, that on the surface of a particle of nonmetallic inclusions metal films (layers) are formed that “wet” them and prevent further coagulation and removal of the non-metallic phase. It has been determined, that in order to prevent the effect of “wetting” by these films (layers), it is necessary to create mixing in the tundish. Based on the theoretical principles of removing non-metallic inclusions, a physical modeling of the hydrodynamic processes occurring in the tundish, has been carried out. These studies have made it possible to establish, that the most
effective structure of streams is a vortex, which is formed by the introduction of a reaction chamber. For confirmation of theoretical conclusions and results of physical modeling, industrial tests were conducted to determine the contamination of the metal by the non-metallic inclusions. The test results correspond well with the
data of physical modeling and theoretical conclusions.