HOT-TREATING METHOD OF MOLTEN SLAG PRODUCED AT DECARBURIZATION OF MOLTEN IRON

摘要

PROBLEM TO BE SOLVED: To provide a hot-treating technique of molten slag in which the sensible heat of molten slag left in a refining furnace and the sensible heat and the iron content of molten iron left in the refining furnace can profitably be recovered, in a steel tapping work after completing the decarburization of molten iron.;SOLUTION: The decarburization is applied to the molten iron 2 pretreated for low phosphorization in a converter 3 and the obtained molten steel is tapped off and the molten slag 5' left in the converter 3 at the tapping-off is directly discharged into a molten iron ladle 9 in which the molten iron 7 is separately held. The molten slag 5' held into the molten iron ladle 9 and the above molten iron 7 held beforehand in it, are charged into a converter type dephosphorizing furnace 10, and the dephosphorizing treatment is applied to the molten iron 7 charged in this dephosphorizing furnace 10. In the above method, the molten iron ladle 9 is utilized as the dephosphorizing furnace as it is. Further, when the molten slag 5' is discharged into the molten iron ladle 9, the molten iron 4' left in the converter 3 is discharged into the molten iron ladle 9 together with the molten slag 5' and thereafter, the treatment is carried out as the same way as the above.;COPYRIGHT: (C)2001,JPO