METHOD AND DEVICE FOR PRODUCING MOLTEN IRON

摘要

PURPOSE: A technique, for producing a molten iron by arc heating a pre-reducing iron in a melting furnace, capable of withstanding erosion to furnace wall refractory in a melting furnace to improve the working life and capable of producing a molten iron with a homogenized composition while keeping high productivity is provided. CONSTITUTION: In a stationary non-tilting arc heating type melting furnace for melting a pre-reducing iron(13) by arc heating mainly composed of radiation heat, the stationary non-tilting arc heating type melting furnace is characterized in that the melting furnace has a pre-reducing iron feeding mechanism(9), electrodes for an arc heating(5) and a molten iron discharging mechanism(3), wherein the melting is performed while keeping a refractory wearing index RF represented by the following equation at 400 MWV/m¬2 or less: RF=PxE/L¬2, wherein RF represents the refractory wearing index (MWV/m¬2); P represents the arc power for one phase (MW); E is the arc voltage (V); and L represents the shortest distance (m) between the electrode side surface of the tip of within the arc heating furnace and the furnace wall inner surface, L=ID/2-PCD/2-DE/2, wherein ID represents the inside diameter (m) of the melting furnace; PCD represents the electrode pitch circle diameter (m); and DE represents the electrode diameter (m).