Patent ID: 11125503

Abstract:
A melting furnace includes a melting portion to which a metal material is supplied; a burner for melting the metal material in the melting portion; a heating portion that receives the molten material from the melting portion; a temperature regulating portion that receives the molten material from the heating portion; a separator that separates the heating portion and the temperature regulating portion, wherein the lower portion of the separator is immersed in the molten material to form, below the separator, an inlet; an immersion heater wherein at least part of the immersion heater is immersed in the molten material in the temperature regulating portion; and a gas introduction path that is formed in the separator, and that introduces combustion gas from the burner into a space above the molten material in the temperature regulating portion; wherein the burner is controlled so that the combustion gas has an oxygen concentration of 5% or less.