Reaction between magnesia-chrome brick/slag interface by electric furnace static slag corrosion test

Abstract

Reaction of magnesia-chrome (MgO-Cr2O3) brick with molten MgO-Al2O3-SiO2-CaO-FetO slag using electric furnace static corrosion test method was investigated by X-ray diffraction (XRD), optical polarized microscopy (OPM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), scanning transmission electron microscopy (STEM) and electron diffraction (ED). From XRD patterns it is found that the crystalline phases at slag-refractory interface are mostly MgO and MgCr2O4 with a minor phase of CaMgSiO4. The MgO content in MgO-Cr2O3 bricks decreases with temperature increasing. The activity coefficient of MgO (γMgo) in the molten MgO-Al2O3-SiO2-CaO-FetO slag also increases with temperature increasing. The diffusion layer of (Mg,Fe) (Cr,Al)2O4 is formed between slag area and MgCr 2O4 matrix. © 2008 The Japan Institute of Metals.