摘要
基于转炉出钢过程回磷机理分析与控制措施,通过现场取样、数据采集、模拟试验及利用FactSage软件分析了转炉冶炼过程脱磷机理,研究探讨了渣中FeO含量、TiO2含量、SiO2含量、终点温度、熔渣碱度、底吹搅拌对脱磷的影响.研究结果表明,结合水钢生产实践,控制终点温度在1630益-1645益、终渣FeO含量低于15%、SiO2含量为13.4%、碱度为3.5时,可促进富磷相C2S的生成和稳定存在,使脱磷率达84.42%及以上.同时,可高效控制熔渣含Ti量对熔渣脱磷效果的影响.维护较好的底吹效果可促进化渣,有效控制冶炼前期渣-钢界面温度在合适范围以促进脱磷,但较好的控制前期脱磷反应与脱碳反应的进行还存在一定技术难度.
On the basis of mechanism analysis and control measures of rephosphorization from slag to metal in the topping stage in BOF(basic oxygen furnace)steelmaking process,the mechanism of dephosphorization in BOF steelmaking process is analyzed by field sampling,data gathering,experimental simulating and FactSage software calculating,the effects of FeO,TiO2 and SiO2 in slag,final temperature,slag basicity,bottom blowing stirring on dephosphorization are investigated.The studied results show that,according to the productive practice in Shuigang,the final temperature of 1630-1645℃and the final slag with FeO<15%,SiO2=13.4%and basicity=3.5 can promote the formation and stable existence of phosphorous rich phase(2CaO·SiO2)and make dephosphorization rate reach 84.42%and above.At the same time,the influence of Ti content in slag on dephosphorization effect of slag can be effectively controlled.Maintaining a good bottom blowing effect can promote slag melting and effectively control the slag-steel interface temperature in the appropriate range in the early stage of steelmaking to promote dephosphorization.However,there are still some technical difficulties in better controlling the dephosphorization and decarburization reactions in the early stage.
作者
华福波
伍从应
谢祥
杨龙飞
文安义
Hua Fubo;Wu Congying;Xie Xiang;Yang Longfei;Wen Anyi(Industrial Department of Steelmaking and Steel Rolling,Shougang Shuicheng Iron&Steel(Group)Co.,Ltd,.Liupanshui 553028,Guizhou,China;Manufacture Management Department,Shougang Shuicheng Iron&Steel(Group)Co.,Ltd,.Liupanshui 553028,Guizhou,China)
出处
《水钢科技》
2020年第3期1-8,73,共9页
Shuigang Science & Technology
关键词
转炉
脱磷
温度
碱度
底吹
BOF(basic oxygen furnace)
dephosphorization
temperature
basicity
bottom blowing
