用后焦炉硅砖的显微结构

Microstructural characters of used silica brick in coke oven

借助于OM、SEM、EDAX和XRD分析手段对用后焦炉炭化室硅砖炭化面和燃烧面的显微结构变化做了研究。炭化面亚稳方石英和残存石英几乎全部鳞石英化,吸收焦炭中的MgO、Al2O3、P2O5和CaO,生成磷酸三钙(C3P)、假硅灰石和玻璃相。由于煤气裂解作用在砖的气孔中形成碳沉积,气孔封闭化。燃烧面由鳞石英、硅酸盐、磷酸三钙、玻璃相和无定形碳组成,但沉积碳较少。

Microstructural changes on coke face and gas face of used silica brick for coke oven chamber were studied by means of OM, SEM, EDAX and XRD. On the coke face, the metacristobalite and Quartz transformed into tridymite completely. The C3P, pseudowollastonite and glassy were formed by absorbtion of MgO, Al2O3, P2O5, and CaO contained in coke. Owing to the split of gas, the carbon precipitated in pores of brick. Pores were closed. On the gas face, there are tridymite, silicate, C3P, glass phase and also a few precipitated carbon.