MOLTEN IRON DESULFURIZATION METHOD

摘要

At the time of molten iron desulfurization treatment, this molten iron desulfurization method analyzes the S concentration of a sample taken from molten iron in at least one stage before, during or after desulfurization treatment, and, on the basis of the analysis value of said S concentration, performs further desulfurization, determines the end of desulfurization, or determines conditions for subsequent desulfurization. In this molten iron desulfurization method, the S concentration after desulfurization treatment is accurately controlled, and thereby, deviations in the S concentration are prevented and cost increases and disruptions in the steelmaking process due to adding excessive amounts of desulfurization agent are prevented by means of quick and accurate analysis of the S concentration in the molten iron using an analysis method involving a high-frequency induction heating step for changing the S in the molten iron to SO2 by oxidizing the sample by high-frequency induction heating in a pure oxygen atmosphere, and an analysis step for assaying the S concentration in the sample by analyzing, with the UV fluorescence method, the SO2-containing gas generated in the high-frequency induction heating step.