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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.
The samples of seven representative parts of No.2 blast furnace hearth in Hunan Iron and Steel Co. Ltd. were analyzed by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and atomic absorption spectrometry to study the erosive effect of harmful elements on the carbon brick in the side wall of blast furnace hearth and the pulverized fracture mechanism The results show that the erosion mechanism of carbon brick in different parts of blast furnace hearth is different.The first layer is mainly catalysis of harmful elements in carbon melting reaction and the formation of leucite.The upper carbon brick is infiltrated into brick by K , The change of brick-based; tuyere to Zn-based erosion; K more iron mouth, while the other Pb enrichment. The same kind of harmful elements in different parts of the erosion of carbon brick mechanism is different .K element in the uppermost part The main role in the lower part of the infiltration to the inside of the carbon brick to make the main carbon brick modified; Zn in the tuyere brick obvious crystallization of the hearth in the hearth contains a lot of Zn is not crystalline, but attached to the brick Upper surface.