Molten iron desulphurization method
The invention relates to a molten iron desulphurization method which comprises the following steps: adding a KR desulfurizer into an iron ladle, pouring molten iron into the iron ladle, stirring to carry out a desulphurization reaction between the KR desulfurizer and molten iron; and blowing granulated magnesium to the iron ladle so as to conduct desulphurization. The KR desulfurizer has advantages of low granularity, large reaction area and good average molten iron desulphurization effect. With the addition of the KR desulfurizer, CaO content of iron slag is effectively increased, alkalinity of iron slag is raised, iron slag is modified, and it is beneficial to adsorption of granulated magnesium desulphurization products and removal of desulphurization slag. According to the molten iron desulphurized by a two-step method, first-hit yield of desulphurization by blowing granulated magnesium is raised, and molten iron resulfurization in a converter is minimized. Thus, desulphurization cost during the whole molten iron desulphurization process is reduced. 1. A method of desulfurization of molten iron, characterized in that comprises the following steps: In the desulfurizer KR ironclad , in the molten iron is poured into the ironclad , by stirring the molten iron desulfurizer and KR desulfurization reaction; ironclad for blowing particles of the magnesium desulfurization. 2. Method of desulfurization of molten iron according to Claim 1, characterized in that it also comprises the following steps: the weight of the water is determined according to the adding amount of the desulfurizer KR. 3. Method of desulfurization of molten iron according to Claim 1, characterized in that the component comprises of the desulfurizer KR: weight percentage content is 80%-95% lime and weight percentage content is 5%-20% the fluorite. 4. Method of desulfurization of molten iron according to Claim 3, characterized in that the containing desulfurizer KR weight percentage is 90% of the lime and weight percentage content is 10% the fluorite. 5. Method of desulfurization of molten iron according to Claim 3 or 4, characterized in that the lime in the activity of the constant temperature in the water 40 ±1 °C, 10 min in the concentration of consumption 4mol/ml of HCl, not less than 320 ml. 6. Method of desulfurization of molten iron according to Claim 1, characterized in that the particle size of the desulfurizer KR in the 0.5-1.0 mm larger than the ratio of the 80%, particle size of less than 0.3 mm and greater than 1.2 mm, respectively, of no greater than the proportion of 10%. 7. Method of desulfurization of molten iron according to Claim 3 or 4, characterized in that the lime component including the weight percentage of the SiO2 ≤ 5%, S< 0.03%, moisture <0.5%, burning <0.5%, the rest is CaO. 8. Method of desulfurization of molten iron according to Claim 3 or 4, characterized in that the weight percentage of the fluorite component content including SiO2 ≤ 18%, S< 0.2%, moisture <0.5, the rest is CaF2.