Method for producing molten pig iron

Abstract

A method for producing molten pig iron that can achieve high energy efficiency in a melting step of melting reduced iron in a submerged arc furnace, including: a melting step of melting, in a submerged arc furnace, an iron source raw material including reduced iron with an average metallization rate of 60% or greater to obtain molten pig iron, the melting step also including at least one or both of adding a slag forming material to adjust the basicity (CaO/SiO2) of molten slag formed on the molten pig iron, and adding a carbonaceous material to adjust the C content of the molten pig iron. Herein, the metallization rate refers to the mass percentage of a metallic iron component to the total mass of an iron component contained in the reduced iron, and the basicity (CaO/SiO2) of the molten slag refers to the mass ratio of CaO to SiO2.

Dependencies are inferred from the claim text.