›› 2016, Vol. 32 ›› Issue (1): 15-19.

• 钢水冶炼 • 上一篇    下一篇

重钢80t转炉终点炉渣成分控制研究

潘银虎1,文光华1,2,周海1,唐萍3,侯自兵4   

  1. 1. 重庆大学
    2.
    3. 重庆大学材料科学与工程学院冶金系
    4. 重庆大学材料科学与工程学院冶金工程系
  • 收稿日期:2015-07-07 修回日期:2015-07-28 接受日期:1900-01-01 出版日期:2016-02-05 发布日期:2016-02-29
  • 通讯作者: 文光华 E-mail:wengh@cqu.edu.cn

Study on final slag composition control for highly efficient dephosphorization of 80 t converter in CISC

  1. 1.
    2. College of Materials Science and Engineering, Chongqing University
  • Received:2015-07-07 Revised:2015-07-28 Accepted:1900-01-01 Online:2016-02-05 Published:2016-02-29

摘要: 针对重庆钢铁(集团)有限责任公司80t转炉在铁水平均w(P)=0.16%条件下,采用单渣法冶炼工艺时,终点平均脱磷率不能达到大于90%的生产问题,在考虑渣界面(FeO)传氧作用条件下,计算分析了炉渣碱度和(FeO)含量对碳磷理论转化温度的影响;以转炉冶炼后期脱磷的热力学及代表动力学因素的炉渣熔化温度为基础,研究分析了终点熔池温度与碳磷理论转化温度差值,以及炉渣过热度对脱磷率的影响,确定了终点熔池温度一定的条件下合适的炉渣碱度和(FeO)含量。结果表明:终点转化温度差值每减少10℃,终点脱磷率提高约1.2%;转炉吹炼终点温度设置在1640℃,终渣碱度为4.2~4.55,w(FeO)=23%~27%,脱磷率可达到90%以上。

关键词: 转炉, 脱磷, 碳磷理论转化温度, 终点温度

Abstract: Together with the condition that the average phosphorus mass fraction is 0.16% in molten iron of Chongqing Iron & Steel (Group) Co.,Ltd., average dephosphorization rate couldn’t exceed 90% with single slag method in 80t converter. Considering that (FeO) can transfer oxygen at steel-slag interface, the effect of slag basicity and w(FeO) on the C-P selective oxidation temperature was studied through calculation. Based on dephosphorization thermodynamics and the meltability of slag which represents kinetics at the later blowing stage of BOF, the effects of two parameters on the dephosphorization rate were studied. The first is difference between the end-point temperature of BOF molten steel and C-P selective oxidation temperature, and the second is superheat of slag. In addition, the suitable slag basicity and w(FeO) were determined when the end-point temperature of BOF molten steel was given. The results show that with the temperature difference decrease a 10℃, the dephosphorization rate increase by 1.2%. When the end-point temperature of BOF molten steel is about 1640℃, basicity is controlled in the range of 4.2 to 4.55, and w(FeO) of end steel slag is between 23% and 27%, the dephosphorization rate reaches over 90%.

Key words: converter, dephosphorization, C-P selective oxidation temperature, end-point temperature