Method for desulfurizing hot metal

A method for desulfurizing molten hot metal, the method comprising:

• taking a sample out from the molten hot metal in at least one stage of before, during, and after a desulfurization treatment of the molten hot metal,
• analyzing an S concentration of the sample and determining an S concentration of the molten hot metal, and
• based on the determined S concentration, (i) conducting further subsequent desulfurization, (ii) judging an end of desulfurization, or (iii) determining subsequent desulfurization conditions,
• wherein the S concentration of the sample is analyzed by a method comprising:
• oxidizing the sample under high frequency induction heating in a pure oxygen atmosphere to convert S in the sample to SO2 by supplying pure oxygen with an oxygen concentration of not less than 99.5 vol.%, the high frequency inducting heating step generating an SO2-containing gas by combustion of the sample, and
• analyzing the SO2-containing gas generated in the high frequency induction heating step through an ultraviolet fluorescence method to quantify S concentration in the sample.