Molten iron refining method

A molten iron refining method in which an auxiliary material is added, and an oxidizing gas is supplied through a top-blowing lance, to a cold iron source and molten pig iron that are contained or fed in a converter-type vessel, and molten iron is subjected to a refining process,

• wherein:
• prior to the refining process, a pre-charged cold iron source that is part of the cold iron source and charged all at once into the converter-type vessel before the molten pig iron is charged into the converter-type vessel is charged in an amount not larger than 0.15 times a sum of an amount of the pre-charged cold iron source and a charge amount of the molten pig iron, or is not charged;
• a furnace-top-added cold iron source that is part or all of the cold iron source and added from a furnace top of the converter-type vessel is fed into the converter-type vessel during the refining process;
• a burner is further used that is provided at a leading end of the top-blowing lance or at a leading end of a second lance installed separately from the top-blowing lance, and that has spray holes through which a fuel and a combustion-supporting gas are ejected;
• and
• during at least part of a period of the refining process, a powdery auxiliary material or an auxiliary material processed into powder that is at least part of the auxiliary material is blown in so as to pass through a flame formed by the burner.