转炉终渣低全铁控制研究和应用  

Research and Application of Low Total Iron Control in Converter Final Slag

作　　者：史进强 闫龙格 高福彬 王玉刚 Shi Jinqiang;Yan Longge;Gao Fubing;Wang Yugang(Technical Center,HBIS Group Hansteel Company,Handan Hebei 056015,China)

机构地区：[1]河钢集团邯钢公司技术中心,河北邯郸056015

出　　处：《山西冶金》2024年第9期34-37,共4页Shanxi Metallurgy

摘　　要：借鉴国内外学者对降转炉终渣全铁和炉渣脱磷的研究,结合120 t转炉生产实际,对40Cr钢进行了终渣低全铁控制实验。实验本着“前期渣早化,提高冶炼前期渣脱磷率,过程渣化透不返干”的原则,枪位由三段式优化为五段式,通过终点低枪位搅拌,在促进金—渣界面反应和促进脱磷反应的同时,加速降低渣中FeO的含量,在满足终点磷钢种要求的同时,达到降低渣中全铁的目的。实验结果表明:渣中w(TFe)平均为13.59%,较实际生产降低了2.50%。脱磷率平均为92.4%,较实际生产提高了2.8%。通过炉渣矿相分析,验证了降低渣中FeO,可以促进渣中磷的富集、固磷相C_(2)S的生成、长大。工业推广应用后,转炉终渣全铁控制在14.6%,实现了中高碳钢转炉终渣高拉碳低磷低全铁控制,取得了良好的效果。Based on the research of domestic and foreign scholars on total iron in converter final slag and slag dephosphorization,combined with the actual production of a 120 t converter,an experiment on controlling low total iron in final slag was carried out on 40Cr steel.The experiment followed the principle of "earlier formation of early-stage slag,improving the dephosphorization rate of early-stage slag in smelting,and thorough slag melting without re-drying during the process".The lance position was optimized from a three-stage to a five-stage.By stirring at a low lance position at the end,the reaction at the metal-slag interface was promoted,dephosphorization reaction was accelerated,and the FeO in the slag was reduced simultaneously,achieving the purpose of meeting the requirements of the steel grade for phosphorus at the end while reducing the total iron in the slag.Good experimental results were achieved:the average w(TFe) in the slag was 13.59%,which was 2.50% lower than the actual production;the average dephosphorization rate was 92.40%,which was 2.80%higher than the actual production.Through the analysis of slag mineral phases,it was verified that reducing the final FeO in the slag promoted the enrichment of phosphorus in the slag,the generation,growth of solid phosphorus phase C_(2)S,and the precipitation of high melting point phase Mg O,and reducing the phase of Mg O+Ca O+Fe O in the slag could reduce the total iron content.After the industrial promotion and application,the total iron in the final slag of the converter was controlled at 14.60%,realizing the control of low total iron in the final slag of the medium and high carbon steel converter.

关 键 词：中高碳钢 高拉碳 脱磷 终渣低TFe 固磷相C_(2)S 

分 类 号：TF713[冶金工程—钢铁冶金]