| 摘要 |
Provided is a method for refining hot metal in a converter that is used during the formation of flames by using a burner in a tip end portion of a top-blowing lance, the wearing of the heat of the flames onto the hot metal, and the dephosphorization and decarburization refining of the hot metal in the converter. According to the present invention, there is no concern of heat generation and combustion of the top-blowing lance in a flow path, wearing heat efficiency and productivity are excellent, and it is possible to increase the blending ratio of a cold iron source such as iron scrap. A top-blowing lance (3) that comprises a refining powder supply flow path, a combustion oxidizing gas supply flow path, and a refining oxidizing gas supply flow path is used to supply one or more types of refining powder (29) among a lime-based solvent medium, iron oxide, and a combustible material and fuel gas or gas in which the fuel gas is mixed with inert gas as transport gas from the refining powder supply flow path toward a hot metal bath surface. Combustion oxidizing gas is supplied from the combustion oxidizing gas supply flow path so as to form the flames downward from a tip of the top-blowing lance, and refining oxidizing gas is supplied from the combustion oxidizing gas supply flow path toward the hot metal bath surface. |
