摘要
高碳出钢对于提高钢液洁净度十分有利,但同时也给转炉脱磷带来了严峻挑战。针对高碳出钢时脱磷时间缩短、冶炼中后期发生回磷现象等问题,建立了基于离子分子共存理论(IMCT)的转炉碳磷氧化转折温度的热力学模型。通过该模型预测了最佳一次倒渣温度区间。为了避免冶炼中后期发生回磷现象,应在合适的倒渣温度区间内倒渣,同时实现转炉双渣吹炼一次倒渣高效脱磷。结合现场生产数据及脱磷热力学,重点分析当一倒渣碱度、一倒渣中MgO含量、一倒渣中FeO含量等参数变化时对各组元活度的影响,从而判断出对最佳一倒温度区间的影响,找到碳磷发生选择性氧化的最佳温度区间。
When the carbon content in the steel produced by the converter is high,it can reduce the oxygen content in the steel from the source and improve the cleanliness of the steel liquid.But it also brings severe challenges to the dephosphorization of converter.A thermodynamic model based on the theory of ion molecule coexistence(IMCT)for the transition temperature on selective oxidation of carbon and phosphorus in the converter was established to address issues such as shortened dephosphorization time during high carbon tapping and the occurrence of rephosphorization phenomenon in the middle and later stages of smelting.The optimal temperature range for the first slag pouring could be predicted.In order to avoid the phenomenon of rephosphorization in the middle and late period of smelting,the slag should be poured in the appropriate temperature range,and the efficient dephosphorization should be realized in the double-slag blowing process of converter.Combined with the on-site production data and dephosphorization thermodynamics,the influence of the variation of basicity,MgO content and FeO content on the activity of each component was analyzed,the influence on the optimal temperature range was evaluated and the optimal temperature range for the selective oxidation of carbon and phosphorus were revealed.
作者
张嘉欣
李光强
张蓬朝
田雨丰
刘昱
ZHANG Jiaxin;LI Guangqiang;ZHANG Pengzhao;TIAN Yufeng;LIU Yu(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《炼钢》
CAS
北大核心
2024年第3期8-14,26,共8页
Steelmaking
基金
湖北省科技厅资助项目(2022BAA021)
中国科协青年人才托举工程项目(2022QNRC001)。
关键词
转炉炼钢
碳磷选择性氧化
脱磷渣
活度
温度
converter steelmaking
selective oxidation of carbon and phosphorus
dephosphorization slag
activity
temperature
