马钢转炉双渣法脱磷工艺生产实践

主要介绍了马钢第三钢轧总厂70 t转炉炼钢双渣法脱磷工艺生产实践,实践结果表明,在脱磷阶段,控制熔渣碱度在1.5~2.0,渣中ω(FeO)含量在10%~15%,一倒温度在1400~1450℃,可以获得较好的脱磷效果;在脱碳阶段,终渣碱度控制在3.8~4.2,ω(FeO)含量控制在20%~25%,出钢温度控制在1650℃以内,脱磷率可达90%以上。采用双渣法工艺后,转炉石灰用量减少约20 kg/t钢,钢铁料消耗下降4~6 kg/t,具有良好的经济和环境效益。

Production Practice of Double Slag Dephosphorization Processat the Converters of Masteel

The production practice of double-slag dephosphorizing process of the 70 tconverter at Masteel’s No.3 steelmaking and rolling works is introduced, which has showedthat good dephosphorizing effect can be obtained if the slag basicity is controlled at 1.5～2.0,ω（FeO） content in slag at 10%～15% and the first turning-down temperature at 1400～1450 ℃during the dephosphorizing stage, and dephosphorizing rate can reach more than 90% if thefinal slag basicity is controlled at 3.8～4.2, 棕（FeO） content from 20% to 25% and steeltemperature within 1650 ℃ during the decarbonization stage. After adopting the double slagmethod, lime consumption has been reduced by about 20 kg per ton of steel and iron andsteel material consumption reduced by 4～6 kg per ton of steel, achieving good economic andenvironmental benefit.