METHOD FOR REFINING HOT METAL IN CONVERTER

摘要

Provided is a method for refining hot metal in a converter by dephosphorizing or decarburizing the hot metal while forming a burner flame at the leading end of a top-blowing lance to transfer the heat of the flame to the hot metal, thereby providing high heat transfer efficiency and productivity without the risk of heat-up or combustion in a channel in the top-blowing lance so that the content of a cold iron source such as iron and steel scrap can be increased. A method for refining hot metal in a converter using a top-blowing lance 3 having a refining powder supply channel, a combustion oxidizing gas supply channel, and a refining oxidizing gas supply channel that are separate from each other includes supplying at least one of a lime-based flux, iron oxide, and a combustible material as a refining powder 29 from the refining powder supply channel to a surface of the hot metal using a fuel gas or a mixture of the fuel gas and an inert gas as a carrier gas while supplying a combustion oxidizing gas from the combustion oxidizing gas supply channel to form a flame below a leading end of the top-blowing lance, and supplying a refining oxidizing gas from the refining oxidizing gas supply channel to the surface of the hot metal.