| 摘要 |
PROBLEM TO BE SOLVED: To provide a method with which unit requirement of lime and the amount of discharge of slag to the outside of the system are reduced to the lower limits by reusing the slag and also, only slag having extremely small amount of non-slagging lime can be discharged to the outside of the system. SOLUTION: In a steelmaking method by using two sets of refining furnaces, in which the one side is used for a decarburizing furnace and the other side is used for molten iron dephosphorizing furnace, in the decarburizing furnace, while leaving the whole or a part of the decarburized slag produced in this decarburizing furnace, the decarburize-refining is performed to the molten iron refined in the molten iron dephosphorizing furnace. In the molten iron dephosphorizing furnace, while leaving the whole or a part of the dehosphorized slag produced in this molten iron dephosphorizing furnace, a process for refining a blast furnace molten iron or the molten iron applying a desiliconizing treatment and/or a desulfurizing treatment, is preformed at least one time.
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