转炉喷吹石灰石粉分解CO_(2)参与炼钢行为机制研究  

Study on the mechanism of CO_(2) decomposition by blasted limestone powder in converter involved in steelmaking behavior

作　　者：李晨晓 赵鹏 张昀 孟鑫 沈浩杰 纪志浩 LI Chenxiao;ZHAO Peng;ZHANG Yun;MENG Xin;SHEN Haojie;JI Zhihao(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China;Tangshan Key Laboratory of Special Metallurgy and Material Preparation,Tangshan 063210,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]唐山市特种冶金及材料制备重点实验室,河北唐山063210

出　　处：《炼钢》2025年第1期37-44,共8页Steelmaking

基　　金：国家自然科学基金资助项目(52274334);河北省高等学校科学技术研究项目(BJK2022059,BJK2024058);河北省创新能力提升计划项目(23561001D)。

摘　　要：基于绿色低碳和高效冶炼理念,提出了转炉喷吹石灰石粉高效造渣炼钢技术,在炼钢温度下,石灰石粉分解产生的CO_(2)会与熔池元素发生氧化反应,进而影响冶炼效果。基于热态试验分析石灰石粉分解CO_(2)在铁水元素氧化过程中的反应规律,通过调控不同影响因素,系统研究了不同条件下脱碳规律。研究结果表明:与O_(2)相比,石灰石粉分解产生的CO_(2)脱碳速率较慢,O_(2)的脱碳能力约为CO_(2)的1.7倍。在不同初始碳含量下,平均脱碳速率约为0.0256%/min,满足零级反应特征,即初始碳含量不影响脱碳反应速率。随着熔池温度从1450℃提高至1600℃,脱碳率提高到1.17倍,CO_(2)脱碳反应的活化能为27.96 kJ/mol。在较大流量下脱碳率明显增加,反应速度提高到1.68倍。明晰了石灰石粉分解CO_(2)参与脱碳行为热力学规律,进而明确了石灰石粉分解CO_(2)对造渣脱磷行为的影响。Based on the concept of green low-carbon and high-efficiency smelting,the efficient slag-making steelmaking technology of converter blown limestone powder is proposed.At the steelmaking temperature,the CO_(2)generated by the decomposition of limestone powder will undergo oxidation reaction with the elements in the molten pool,which in turn affects the smelting effect.Based on the thermal state experiment to analyze the reaction law of CO_(2)decomposition of limestone powder in the oxidation process of hot metal elements,the decarburization law under different conditions was systematically studied by regulating different influencing factors.The results showed that compared with O_(2),the decarbonization rate of CO_(2)produced by limestone powder decomposition was slower,and the decarbonization capacity of O_(2) was about 1.7 times that of CO_(2).Under different initial carbon contents,the average decarburization rate was about 0.0256%/min,which satisfied the zero-level reaction characteristics,i.e.,the initial carbon content did not affect the decarburization reaction rate.With the increase of molten pool temperature from 1450℃to 1600℃,the decarburization rate increased to 1.17 times,and the activation energy of CO_(2)decarburization reaction was 27.96 kJ/mol.The decarburization rate was obviously increased at a larger flow rate,and the reaction speed increased to 1.68 times.The thermodynamic law of CO_(2)decomposition of limestone powder involved in the decarbonization behavior was clarified,and then the influence of CO_(2)decomposition of limestone powder on the slagging and dephosphorization behavior was clarified.

关 键 词：转炉 石灰石粉 CO_(2) 脱碳 熔池温度 

分 类 号：TF704.5[冶金工程—钢铁冶金]