Abstract：In Shougang Jingtang, all the hot metal ladles are desulphurized with KR, and can meet the demand of de-P converters and de-C converters as far as the layout is concerned. The factors influencing the desulphurization efficiency were described. It was suggested that a certain amount of CaF2 could form eutectic melt with low melting point which could improve the transportation rate of sulphur element in the hot metal; while the Al dross could decrease the oxygen content in the hot metal which was benefit for the desulphurization. The hot metal temperature should be controlled between 1300℃ and 1380℃. If the temperature was too high, the desulphurization flux would aggregate and reduce the interface area between hot metal and flux. Good lime quality and impeller size were also important factors that influenced the desulphurization rate. By undertaking the above measures, the percentage of w［S］≤0.002% after KR process reached to 98% and the average sulphur content at the end of BOF is 0.005%.
2015, Vol. 25 
