| 摘要 |
[Problem] To enhance the efficiencies of desiliconization and dephosphorization of molten pig iron with a small amount of a flux and thereby reduce the manufacturing cost of molten low-phosphorus pig iron and the decarburization refining cost thereof. [Solution] This converter steelmaking process includes: charging a first converter furnace with molten pig iron to desiliconize the molten pig iron; conducting intermediate deslagging treatment such that a part of the slag after desiliconization is discharged with the remainder thereof left in the container together with the molten pig iron; blowing oxygen for refining, a powder that contains a lime-based flux, a fuel gas and a combustion-sustaining gas from a lance with burner function or the like to the surface of the desiliconized molten pig iron left in the converter furnace to dephosphorize the molten pig iron; tapping off the dephosphorized molten pig iron with at least a part of the slag after dephosphorization left in the converter furnace; and thereafter transferring the tapped dephosphorized molten pig iron to another converter furnace to conduct the decarburization-refining of the pig iron. |
