| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique enabling to apply a treatment for optimizing an injecting condition of a lime-based desulfurizing agent, based on the result in which the injecting yield during the desulfurizing treatment, is assumed in on-line. SOLUTION: In a method for desulfurizing molten iron, in which the desulfurizing treatment of the molten iron is performed by stirring the molten iron and the lime based desulfurizing agent with an impeller 4 dipped into the molten iron while placing the lime based desulfurizing agent on the molten iron 3 held in a vessel 2 and further, by injecting the lime based desulfurizing agent 7 through a top-blowing lance 5 which is separated and arranged a tip on the molten iron bath surface from the upper part of the vessel; the exhaust gas temperature is measured on the way of a duct 15 for introducing the dust generated from the molten iron bath surface during desulfurizing treatment together with the exhaust gas into a dust-collecting facility 12, and the injecting yield of the injected lime based desulfurizing agent, is successively assumed based on the exhaust gas temperature and the molten iron temperature, and the condition of the desulfurizing treatment is adjusted so as to improve the injected yield. COPYRIGHT: (C)2011,JPO&INPIT
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