高废钢比条件下转炉“留渣+双渣”脱磷工艺研究与实践  

Research and Practice of Dephosphorization by “SlagRemaining+Double Slag” Process in Converter under High Scrap Ratio

作　　者：潘军[1] 邓南阳[1] 况贤高[1] 刘威 薛顺[1] 赵斌[1] 宋磊[1] PAN Jun;DENG Nanyang;KUANG Xiangao;LIU Wei;XUE Shun;ZHAO Bin(Long products division of Ma'anshan Iron & Steel Co Ltd,Mahans han 243000,China)

机构地区：[1]马鞍山钢铁股份有限公司长材事业部

出　　处：《金属材料与冶金工程》2019年第2期40-46,共7页Metal Materials and Metallurgy Engineering

摘　　要：在高废钢比条件下,从优化转炉“留渣+双渣”冶炼工艺脱磷效果的角度,分别研究了倒炉温度、炉渣碱度以及(FeO)含量生产控制要点对脱磷率的影响。生产实践表明:脱磷阶段倒渣温度控制在1380~1450t,碱度控制在1.4-2.0,渣中(FeO)含量控制在15%~25%,脱磷阶段平均脱磷率为45.57%;脱碳阶段炉渣碱度控制在3.5-4.0,渣中(FeO)含量控制在18%~25%,终点温度控制W1650P,脱碳阶段平均脱磷率为86.51%O采用“留渣+双渣”冶炼工艺后,试验炉次平均脱磷率达90%以上,转炉终点w(P)波动范围为0.005%~0.033%,平均为0.012%。与传统“单渣法”脱磷工艺相比,石灰消耗降低21.89kg/t,钢铁料消耗降低4.39kg/t,取得了显著的经济效益。In order to optimize of dephosphorization by"slag retention+double slag"process in converter under high scrap ratio,the effects of furnace temperature,slag basicity and(Fe0)content production process control points on dephosphorization were studied.The production practice shows that when the slag pouring temperature is controlled at 1 380~1450℃,the basicity is controlled at 1.4~2.0,the FeO content in the slag is controlled at 15%~25%,the average dephosphorization rate is 45.57%;when the slag basicity is controlled at 3.5~4.0,the content of FeO in the slag is controlled at 18%~25%,the final temperature is controlled no higher than 1650℃,and the average dephosphorization rate is 86.51%in the dephosphorization stage.The average dephosphorization rate of the test furnace is over 90%and the fluctuation range of the end point w(P)of converter is 0.005%~0.033%with an average of 0.012%after adopting"retaining slag+double slag"smelting process.Compared with traditional"single slag"dephosphorization process,lime consumption is reduced by 21.89 kg/t,iron and steel consumption is reduced by 4.39kg/t,and remarkable economic benefits are obtained.

关 键 词：高废钢比 留渣双渣 脱磷率 磷分配比 

分 类 号：TF813[冶金工程—有色金属冶金]