高炉内碱金属蒸气对焦炭的破坏机理  

Mechanism of coke destruction by alkali metal vapors in BF

作　　者：徐益军 袁骧 但家云 周峰 李克江[2] 张建良[2] XU Yijun;YUAN Xiang;DAN Jiayun;ZHOU Feng;LI Kejiang;ZHANG Jianliang(Ironmaking Plant,Xiangtan Iron and Steel Co.,Ltd.Xiangtan 411100,Hunan,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]湘潭钢铁集团有限公司炼铁厂,湖南湘潭411100 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《炼铁》2025年第1期65-70,共6页Ironmaking

基　　金：国家自然科学基金资助项目(51974019)。

摘　　要：基于焦炭吸附碱金属试验,采用工业CT扫描、转鼓试验等检测方法,阐述了高炉内碱金属蒸气对焦炭微观结构及性能的影响。结果表明:①焦炭吸附钾蒸气后,表面出现片状粉化现象,随着吸附钾蒸气含量的增加,焦炭的劣化程度增加,钾蒸气逐渐在焦炭表面扩散和渗透,生成更多的气孔,裂纹逐渐生长,最终导致焦炭发生大块破碎;②焦炭吸附钾蒸气后,内部结构遭到破坏,气孔和裂纹增多,导致其在高炉内发生溶损反应后,焦炭的反应性指数升高,反应后强度降低;③钾、钠对焦炭的破坏机理不同,钾对焦炭有直接破坏作用,而钠则是吸附在焦炭的表面,促进溶损反应的进行。It is described in this study the influence of alkali metal vapor on the coke microstructure and property inside the blast furnace based on an experiment result of coke adsorption behavior of alkali metal vapor,the approaches of industrial CT scanning and rotary drum test.The study results suggest:(1)the coke surface appears flake pulverization after adsorbing potassium vapor,and such a coke deterioration escalates with the increase of the absorbed potassium vapor content;the potassium vapor gradually diffuses on the coke surface and penetrates inside the coke,generating more and more pores,making the cracks develop,and consequently leading to coke fragmentation.(2)the internal structure of coke is destructed after adsorbing potassium vapor;increase of pores and development of cracks result in higher coke CRI and lower CSR after the erosion reaction in the furnace.(3)the potassium and sodium have different destructive effects on the coke:potassium imposes direct destruction on coke,while sodium promotes the coke erosion reaction after being adsorbed on the coke surface.

关 键 词：焦炭 碱金属 吸附渗透 结构破坏 溶损反应 

分 类 号：TF031[冶金工程—冶金物理化学] TF526.1