To provide an effective method for reusing a converter slag which contains 5.0 mass% or more by mass concentration of free CaO and is not suitable for being converted to a roadbed material.
When producing molten steel by blowing molten pig iron which has not been subjected to preliminary dephosphorizing treatment in a top and bottom combined blown converter, this method for reusing the converter slag which has 5.0% or more by mass concentration of free CaO and is not suitable for being converted to the roadbed material includes: classifying the converter slag which has been produced when decarburization-blowing preliminarily dephosphorized pig iron and contains 5.0% or more by mass concentration of free CaO, from the others; spraying water to the classified converter slag for 30 minutes or longer; adjusting the converter slag to a grain size of 10-100 mm; charging the converter slag into the top and bottom combined blown converter; and blowing the molten pig iron so that a mass concentration ratio (%CaO)/(%SiO
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NAKAGIRI TAKAO
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| JP2006001776A | 2006-01-05 | |||
| JP2002220615A | 2002-08-09 | |||
| JPH01259115A | 1989-10-16 | |||
| JPH06256814A | 1994-09-13 | |||
| JPS6475618A | 1989-03-22 | |||
| JP2006001776A | 2006-01-05 |