HIGHLY EFFICIENT MOLTEN IRON ALLOY REFINING METHOD

A molten iron alloy refining method is for refining a molten iron alloy bath while blowing oxygen to a molten iron alloy bath in a converter furnace, the method includes supplying a direct current between a first electrode disposed above the molten iron alloy bath and a second electrode disposed in contact with the molten iron alloy bath, in which when IP[A] represents a magnitude of an average of a direct current during an energization time when the direct current is supplied, IP'[A] represents a magnitude of an average of the direct current during the energization time within one minute immediately before the feeding of the oxygen is stopped, Ws[t] represents an amount of molten steel in the converter furnace, and As[m2] represents a furnace internal cross-sectional area at a furnace belly portion, at least one of equations (1) to (4) is satisfied. (1): IP ≥ 0.125 × Ws, (2): IP ≥ 1.5 × As, (3): IP' ≥ 0.125 × Ws, and (4): IP' ≥ 1.5 × As.