HOT METAL REFINING METHOD

摘要

When manufacturing molten steel from hot metal using a two base converter-type refining furnace and using one as a hot metal pretreatment refining furnace and the other as a hot metal decarburization refining furnace, the molten slag generated in the decarburization refining furnace is used while still hot as a refining agent in the pretreatment refining furnace without compromising the productivities of the two refining furnaces. A refining method for manufacturing molten steel from hot metal using a converter-type refining furnace with at least two bases and using one as a hot metal pretreatment refining furnace (14) and using the other as a decarburization refining furnace (3) for the hot metal (2) pretreated in the pretreatment refining furnace. After the molten steel (5) obtained by decarburization refining in the decarburization refining furnace has been tapped in a ladle (7), the slag (9) remaining inside the decarburization refining furnace is allowed to flow down, still in the molten state, from above stacked iron scraps to solidify at least a portion of the slag. Then in pretreatment of hot metal in the pretreatment refining furnace, the slag, at least a portion of which has been solidified, is used together with the iron scraps while still hot.