FIELD: metallurgy. SUBSTANCE: claimed desulfurizer comprises homogeneous mixture of industrial calcium carbide and calcium aluminate slag comprising calcium oxide, aluminium oxide and calcium fluoride, at the ratio of components (wt%): 5-30 calcium aluminate; and the industrial calcium carbide balance. The desulfurizer may further comprise metal oxide in amount of 1-6 wt% and is selected from group consisting of iron and manganese oxide. Desulfurizer is prepared by mixing industrial calcium carbide with melt of calcium oxide, aluminium oxide and calcium fluoride quick cooled to solid state. EFFECT: improved properties of the desulfurizer. 4 cl, 3 tbl
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