Method for manufacturing molten iron with electric arc furnace

A method for manufacturing molten iron with an electric arc furnace, in which a cold iron source is melted to manufacture molten iron, the electric arc furnace having a carbonaceous material-injecting device, the method comprising:

• in the carbonaceous material-injecting device, while a carbonaceous material is injected with a carrier gas through a central portion of the carbonaceous material-injecting device, injecting a fuel and a combustion-supporting gas through respective outer peripheral portions of the carbonaceous material-injecting device,
• wherein the carbonaceous material injected through the central portion passes through a cylindrical combustion flame generated by a combustion reaction between the fuel and the combustion-supporting gas and is injected into molten slag and molten iron,
• while the combustion-supporting gas is supplied such that an oxygen ratio with respect to an amount of the fuel supplied into the carbonaceous material-injecting device is in a range of 1.0 to 1.1.