70 t顶底复吹转炉“留渣+双渣”前期脱磷工艺研究与实践  

Research and Practice on Slag Remaing and Double Slag Process of Pre-dephosphorization in 70 t Top Bottom Combined Blown Converter

作　　者：张旭[1] 潘军[1] 薛顺[1] 赵斌[1] 宋磊[1] Zhang Xu;Pan Jun;Xue Shun;Zhao Bin;Song Lei(Long Products Division of Ma’anshan Iron&Steel Co.,Ltd.,Ma’anshan Anhui 243000,China)

机构地区：[1]马鞍山钢铁股份有限公司长材事业部,安徽马鞍山243000

出　　处：《上海金属》2018年第6期69-73,共5页Shanghai Metals

摘　　要：对马钢70 t顶底复吹转炉脱磷热力学和动力学进行了分析,从优化转炉"留渣-双渣"工艺前期脱磷效果的角度,研究了倒炉温度、炉渣碱度、(FeO)含量以及顶底复吹强度对脱磷效果的影响。生产实践表明,在高-低-高氧枪枪位控制模式、供氧强度为3. 6 m3/(t·min)和底吹强度为0. 03 m3/(t·min)工艺条件下,倒渣温度控制在1 380～1 450℃,碱度R=1. 3～1. 8,渣中w(Fe O)=15%～25%,取得了前期脱磷阶段平均脱磷率为45. 57%,磷分配比LP达到65. 23的脱磷效果。The thermodynamics and kinetics of dephosphorization in 70 t top bottom combined blown converter at Masteel were analyzed,and the effects of turndown temperature,slag basicity,(FeO)content and top bottom combined blowing strength on dephosphorization result were studied from the viewpoint of optimizing the dephosphorization effect in the early stage of‘slag remaining double slag’process.The production practice showed that the average dephosphorization rate was 45.57%in the early stage of dephosphorization and the phosphorus distribution ratio L P was 65.23,when the oxygen supply intensity was 3.6 m 3/(t·min)and the bottom blowing intensity was 0.03 m 3/(t·min),the slag temperature was controlled within 1 380-1 450℃,the alkalinity was R=1.3-1.8,and the mass fraction of(FeO)in slag was 15%-25%under the high-low-high oxygen lance position control mode.

关 键 词：留渣+双渣 脱磷率 磷分配比 

分 类 号：TF713[冶金工程—钢铁冶金]