120 t转炉热态渣循环利用工艺研究  

Study on 120 t BOF Steelmaking Process for Thermal State Slag Recycling

作　　者：栾文林[1] 刘志远[1] 王重君 么敬文 郭文斌 刘涛 张俊海 张云鹏 Luan Wenlin;Liu Zhiyuan;Wang Chongjun;Yao Jingwen;Guo Wenbin;Liu Tao;Zhang Junhai;Zhang Yunpeng(Steelmaking Department of Tangshan Medium and Heavy Plate Co.,Ltd.)

机构地区：[1]唐山中厚板材有限公司炼钢部

出　　处：《宽厚板》2024年第2期18-22,共5页Wide and Heavy Plate

摘　　要：唐山中厚板材有限公司为提高转炉热态渣的利用率,对转炉冶炼过程炉渣产生机理进行分析,探索热态渣循环利用的途径。试验全留渣双渣法,即第一炉按原单渣法冶炼出钢和不倒渣溅渣护炉,根据铁水硅含量将数据固化在模型中,保证终点二元碱度控制在3.5~3.8,第二炉加入废钢和铁水进行双渣冶炼,出钢后倒出40%~50%炉渣再溅渣护炉,完成一组正常的冶炼。同时,通过优化副枪自动炼钢模型、增强转炉底吹强度、改造双渣氧枪等措施,保证第一炉碱度控制在3.0以上,实现循环渣造渣方法的自动控制。实施热态渣循环利用后,渣中FeO含量降低2.1%,钢铁料消耗降低4.355 kg/t,稳定了低P高端品种钢的生产工艺,提高命中率22.5%。In order to improve the utilization rate of the thermal state slag for the converter,Tangshan Medium and Heavy Plate Co.,Ltd.analyzes the formation mechanism of the slag in the melting process of the converter,explores the way of thermal state slag recycling and performs the test of slag-remaining+double slag process.The first heat is melt and tapped with slag-splashing fumace protection technology without deslagging operation in accordance with the original single slag method,the data is solidified in the model on basis of the Si content in the hot metal,the end-point binary basicity is controlled to values between 3.5 and 3.8.The second heat is melt by double slag melting method,40%to 50%slag is removed firstly and slag-splashing furnace protection is carried out then after tapping,which completes one set of normal melting.Simultaneously,the basicity of the first heat is controlled to values over 3.0 with automatic control of recycling slag formation method by various measures such as optimizing automatic melting model for auxiliary lance,increasing the converter bottom blowing intensity,revamping the double slag oxygen lance.After the implementation of thermal state slag recycling,the FeO content in the slag is decreased by 2.1%,the consumption of iron and steel materials is reduced by 4.355 kg/t,the production process of low P content high-ended grade steel is stabilized with increasing the hit ratio by 22.5%.

关 键 词：转炉 循环渣 氧枪 底吹强度 炉渣碱度 溅渣护炉 

分 类 号：TF713[冶金工程—钢铁冶金]