Method for KR desulfurization of high-sulfur molten iron

The invention relates to a method for KR desulfurization of high-sulfur molten iron. The method comprises the following steps that temperature measuring is carried out on molten iron with the mass percent of S greater than or equal to 0.070%, the molten iron with the temperature higher than 1280 DEG C directly enters a KR desulphurization device, and the molten iron with the temperature lower than 1280 DEG C is mixed with the high-temperature molten iron; after the molten iron enters a KR desulfurization operation station, slagging off is carried out on the molten iron for the first time until the exposed area of the molten iron surface accounts for for 80% or above; KR desulfurization treatment for the first time is carried out, 30-40% of desulfurization flux is added into a molten iron tank, stirring, nitrogen blowing, and slagging off are carried out, and the mass percent of S in the molten iron is 0.010% or below through desulfurization, and secondary desulfurization treatment is carried out, the residual