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。
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 80 t converter. Considering that （FeO） can transfer oxygen at steelslag 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 was difference between the end-point temperature of BOF molten steel and C-P selective oxidation temperature, and the second was 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 10 ℃, the dephosphorization rate increase by 1.2 %. When the end-point temperature of BOF molten steel is about 1 640 ℃, 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 %.
出处
《炼钢》
CAS
北大核心
2016年第1期15-19,共5页
Steelmaking
关键词
转炉
脱磷
碳磷理论转化温度
终点温度
converter
dephosphorization
C-P selective oxidation temperature
end-point temperature
