Abstract: 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.