铁水脱磷顶吹氧+喷粉搅拌冶炼工艺的应用

 为了获得最佳的供氧和粉剂消耗与温度的关系。国内某钢厂采用专用炉顶吹氧+喷粉搅拌脱磷工艺为AOD炉提供优质的低磷铁水冶炼不锈钢，实现了新型一步法冶炼不锈钢工艺。生产实践表明，随着喷吹钝化石灰粉和铁皮球用量的增加，脱磷率逐渐升高，当石灰喷吹量为10～12 kg/t、铁皮球消耗量为25.0～37.5 kg/t、供氧量为300～400 m3时，脱磷率在85%以上；脱磷率随着钙氧比的增大而减小，当w(CaO)/w(Fe2O3)为0.8时达到最大值，钙氧比为0.8～1.4时脱磷率大部分在85%以上，钙氧比超过1.4时效果降低。

Application of top blowing oxygen and powder injection #br# stirring process for hot metal dephosphorization

 In order to obtain the best oxygen supply and the relationship between powder consumption and temperature.A new one step process of the stainless steel smelting with low phosphorus hot metal was realized in a domestic steel plant using a special top blowing oxygen + powder injection agitation dephosphorization process to provide AOD furnace with the high quality stainless steel smelting with low phosphorus hot metal. The production practice showed that the dephosphorization rate increased with the increasing of the dosage of passivated lime powder and iron balls. When the dosage of lime injection was 10 12 kg/t, the consumption of iron balls was 25.0 37.5 kg/t and the oxygen supply was 300 400 m3, the dephosphorization rate was above 85%, and the dephosphorization rate decreased with the increasing of w(CaO)/w(Fe2O3). The dephosphorization rate was the largest when w(CaO)/w(Fe2O3)=0.8, most of the dephosphorization rate was over 85% when the w(CaO)/w(Fe2O3) between 0.8 and 1.4, and when the w(CaO)/w(Fe2O3) more than 1.4,the effect was reduced.