METHOD OF DESULFURIZING MOLTEN IRON

• Main Authors: ISAWA TOMOO, TANAKA YOSHIYUKI, INOUE YOSHINORI, OYAMA SATOSHI
• Format: Patent
• Language: English; Korean
• Published: 26.10.2011
• Subjects: CHEMISTRY; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

A method of desulfurizing molten iron (2) which comprises stirring molten iron (2) to which a desulfurizing agent (8) has been added and thereby dispersing the desulfurizing agent (8) to desulfurize the molten iron (2), wherein the desulfurizing agent (8) is added to the molten iron (2) multiple times in a manner such that stirring is temporarily stopped or conducted at a reduced stirring force at least one time the desulfurizing agent (8) is added subsequent to the first addition in order to cause slag (9) to rise to the surface of the molten iron (2), and the desulfurizing agent (8) is added to the floating slag (9). Preferably, when the slag is caused to rise to the surface, the impeller immersion depth is reduced. Preferably, the impeller is moved downward when the floating slag is taken into the molten iron. The efficiency of reaction of the added desulfurizing agent is thereby improved.