首钢京唐采用 KR 进行100％全量铁水脱硫预处理，从生产布局上可以同时满足脱磷炉和脱碳炉的生产需要。为了实现 KR 的高效脱硫，对影响脱硫的因素进行了分析和讨论，认为脱硫剂中添加一定量的 CaF2可生成一定量的共熔晶体，提高了铁水中硫元素的传输和反应速率；铁水中加入一定量的铝渣可以降低铁水中的氧活度，提高脱硫反应速度；铁水温度应控制在1300～1380℃之间，温度太高会在石灰颗粒表面形成较多的液相，造成石灰颗粒聚团，减少铁水与脱硫剂的接触面积，降低了反应速率；良好的石灰质量和搅拌头形状也有利于 KR 脱硫。通过以上措施，铁水经过 KR 脱硫预处理后 w[S]≤0．002％比例达到98％以上，转炉终点平均硫质量分数为0．005％。
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 effi-ciency 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 de-crease the oxygen content in the hot metal which was benefit for the desulphurization.The hot metal temperature should be controlled between 1 300 ℃ and 1 380 ℃.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 im-portant 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%.
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