2023 Volume 63 Issue 1 Pages 74-82
The peroxidation of molten steel is a problem that occurred in a combined blowing converter with inert gas bottom blowing. It was caused by the relatively weak stirring power of the bottom blown inert gas compared with that of bottom blown oxygen gas. Although several methods for optimizing the combined blowing conditions have been developed in an attempt to resolve this problem, the effect of equipment conditions such as the converter shape on metallurgical characteristics has not been investigated sufficiently. In this study, the effect of H/D (ratio of bath depth H to bath diameter D) on the reaction rate between slag and metal and furnace body vibration was investigated by water model experiments. It was found that the apparent reaction rate constant kA/Vw increased with increasing H/D, except for the case of H/D = 0.85. The change of kA/Vw with increasing H/D appeared to be related to water bath vibration behavior. An analysis based on a bath surface vibration model indicated that the change of H/D affects bath surface vibration behavior and slag emulsion formation behavior, and these effects increase the reaction interface between the slag and the metal.
