摘要
对湘钢2号高炉炉缸七个有代表部位的样品进行扫描电镜、能量色散谱、X射线衍射和原子吸收光谱分析,研究有害元素对高炉炉缸侧壁碳砖的侵蚀以及粉化断裂机理.结果表明,高炉炉缸不同部位的碳砖侵蚀机理不同.第一层以有害元素在碳素熔损反应中的催化作用及生成白榴石为主;上部碳砖侵蚀以K渗透到砖缝中,改变砖质为主;风口以Zn侵蚀为主;铁口K含量较多,另有Pb富集.同种有害元素在不同部位侵蚀碳砖的机理有所不同.K元素在最上部以催化作用为主,在下部以渗透到碳砖内部使碳砖改性为主;Zn在风口碳砖有明显的结晶,在炉缸炉底上部含有大量的Zn并没有结晶,而是附着在砖表面上部.
Seven samples of a blast furnace at representative positions were analyzed by scanning electron microscopy（SEM）,energy dispersive spectrometry（EDS）,X-ray diffraction（XRD） and atomic absorption spectrometry to study the erosion of carbon bricks at the BF hearth sidewall by harmful elements and the mechanism of pulverizing fracture.The results show that the erosion mechanism of carbon bricks at different parts of the hearth is different.In the first layer the erosion is mainly caused by the catalytic effects of harmful elements in the carbon loss reaction and the generation of leucite;in the upper area,penetration of K into brick work joints leading to a quality change of carbon bricks plays the leading role;in the tuyere,Zn is the main cause of erosion;but in the taphole the content of K is larger,with enrichment of Pb.It is also found that a harmful element has different effects at different parts of the hearth.In the upper area,the erosion mechanism is mainly the catalytic effect of K in the erosion reaction,but in lower part is the penetration of K into carbon bricks leading to a quality change of carbon bricks;Zn significantly crystallizes on carbon bricks in the tuyere,however in the hearth bottom Zn attaches to carbon bricks without obvious crystallization.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2011年第4期491-498,共8页
Journal of University of Science and Technology Beijing
关键词
高炉
炉缸
碱金属
侵蚀
blast furnaces
hearths
alkali metals
erosion
