The reaction between the magnesia-chrome brick and the molten slag of MgO-Al2O3-SiO2-CaO-FetO and the resulting microstructure

The reaction and microstructure at the interface of MgO-Cr2O3 brick and the molten slag of MgO-Al2O3-SiO2-CaO-FetO after static slag corrosion at 1823-1923 K for various times and the resulting microstructure were investigated and characterized. After the static slag corrosion at 1923 K for 4 h, the XRD results show the major phases of periclase MgO, MgCr2O4 spinel, and CaMgSiO4 as the minor phase. MgCr2O4 phase causes MgO to form a discontinuous phase in MgO-Cr2O4 brick. After static slag corrosion at 1923 K for 4 h, SEM micrographs show that brick interior cracks, MgO and dissolved MgO. MgO dissolved due to the molten plag penetrated into the brick interior and reaction with it, leading to a localized dissolution of brick slag. TEM micrographs and ED patterns demonstrate that the minor phase of (Mg, Fe)(Al, Cr)(2)O-4 precipitates in the MgCr2O4 matrix. (C) 2008 Published by Elsevier Ltd and Techna Group S.r.l.