梅钢焦炉用后硅砖显微结构分析

Microstructure analysis of silica brick used in coke oven of Meisteel

显微结构分析表明:焦炉炭化室用后硅砖中或多或少存在残余石英,而燃烧室由于温度较高,其硅砖中的石英逐渐经亚稳方石英转变为鳞石英。焦炉用后硅砖的相变过程只限于石英和亚稳方石英的转化,随着石英和亚稳方石英逐渐转变成鳞石英,硅砖结构趋于稳定。炭化室用后硅砖表面出现碳沉积并石墨化,对硅砖起到保护作用,并有利于提高炭化室的热导率。

Microstructure analysis shows quartz remains more or less silica brick used in coking chamber of coke oven,and quartz gradually becomes metastable cristobalite and then translates into tridymite in silica brick used in higher temperature combustion chamber.Phase change of silica brick only limits to transformation of quartz and metastable cristobalite.When finished,structure of silica brick trends to stable.Carbon sedimentates and graphitizes which helps to protect the silica brick and improve heat conductivity of silica brick used in coking chamber.