| 摘要 |
PURPOSE:To decrease quickly, economically and efficiently the inclusions in a molten steel by blowing a specifically composed treating agent together with an inert gas into a bath while the treating agent for absorbing the inclusions does not exist on the bath surface on which the blowing gas floats. CONSTITUTION:The treating agent which consists essentially of CaF2 and CaO and consists of the balance unavoidable components and in which the concn. of CaF2 in the essential components consisting of CaF2 and CaO is <=20wt% is used as the treating agent for absorbing the inclusions in the molten steel 7. Such treating agent is blown with the inert gas as a carrier gas through a conduit 6 provided to a vessel 1 from a blowing pipe 3 into the molten steel 7 in a circulation path 2. The blowing gas is discharged through a porous brick 31 to a discharge system 32 without including slag 8 into the molten steel 7 as the slag 8 does not exist on the surface of the floating molten steel 7. The treating agent which is absorbed the inclusions in the circulation path 2 interposes between the bottom surface of the slag 8 and the top surface of the molten steel 7 and improves the inclusion effect of the treating agent. |
