转炉高效脱磷技术开发与应用

Development and Application of High-Efficiency Dephosphorization Technology for Converter

本文介绍了某公司的转炉高效脱磷实践。2021年以来,因原燃料结构变化,铁水P含量由0.90%升高到1.20%,在既没有铁水脱磷预处理工序,又不具备实现转炉双联法的条件下,采用单渣法冶炼,转炉脱磷率不稳定,出钢磷含量波动大,为了保证钢水P含量合格,经常需要多次补吹,钢水终点氧化性高、脱氧合金时元素收得率低。通过对转炉终点温度、炉渣FeO含量、MgO含量及炉渣碱度进行分析研究,优化调整造渣制度、供氧制度,形成了以终点温度1620℃~1640℃、炉渣碱度2.4~3.0、炉渣FeO含量18%~20%、炉渣MgO含量7%~8%为关键工艺质控点的高效脱磷工艺技术。与原工艺相比,终点P含量均值由0.038%降低到0.026%,降幅为31.6%。

This paper introduces the development and application of converter high efficiency dephosphorization technology developed by Fujian Quanzhou Minguang Iron and Steel Co.,Ltd.and its effect.Since 2021,the P content of molten iron has increased from 0.90%to 1.20%due to changes in the structure of raw materials and fuels,By analyzing the end temperature of converter,FeO content,MgO content and slag alkalinity,Formulate reasonable slag making system and oxygen supply system,and form efficient dephosphorization process technology with endpoint temperature of 1620℃~1640℃,slag alkalinity of 2.4~3.0,FeO content of 18%~20%,MgO content of 7%~9%as key process quality control points.Compared with the original process,the end point P content decreased from 0.038%to 0.026%,with a reduction of 31.6%.