富氧喷煤对耐火材料侵蚀的实验研究

利用煤粉燃烧试验装置模拟高炉富氧喷煤实际情况,对硅砖、高铝砖和黏土砖进行了热空气侵蚀试验,分析了侵蚀后试样的物相和显微结构.结果表明:随着鼓风富氧率的提高,侵蚀后硅砖中玻璃质和隐晶质硅酸盐含量不断降低,气孔孔径扩大,气孔率不断升高;高铝砖中莫来石和方石英的含量不断升高,玻璃质硅酸盐和隐晶质铝硅酸盐的含量则不断下降,气孔孔径扩大,气孔率不断升高;黏土砖的物相组成和显微结构都没有发生明显的变化.

Experimental Investigation on Effect of Oxygen Enrichment on Erosion of Refractories

The erosion process of different refractories was experimentally investigated through modelling the combustion by injecting pulverized coal in BF where the oxygen is enriched.Then,the phase composition and microstructure of such eroded samples of refractory bricks as silica,high-alumina and fireclay bricks were analyzed.The results showed that along with the increasing oxygen content for enrichment,the contents of glassy and aphanitic silicates decrease continuously with expanded pore size and increasing porosity in eroded silica brick and high-alumina brick in which the contents of mullite and cristobalite increase as well.As to the fireclay brick,in which both the phase composition and microstructure show no obvious change.