Effect of electromagnetic field on slag corrosion resistance of low carbon MgO-C refractories

Using MgO-C refractories containing 6% carbon and the slag with a basicity (CaO/SiO2) of around 0.8, the melting slag resistance experiments of low carbon MgO-C refractories were carried out in induction furnace and resistance furnace, respectively. The microstructure of low carbon MgO-C refractories corroded by slag under the different conditions was analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDAX). The results show that in induction furnace having electromagnetic field (EMF), there are MgFe2O4 spinel with a little of Mn ions generated in the interfacial layer. Part of the solid solution is monticellite [CaMgSiO4] containing a little MnO and FeO. While under the condition of EMF free, there is not MgFe2O4 spinel in the interfacial layer and the solid solution is monticellite (CaMgSiO4). At a high temperature. EMF increases the diffusion coefficient of Fe2+/3+ ions, which displaces Mg2+ and forms MgFe2O4 with a little of Mn ions. There are MgAl2O4 spinel in the penetration layers under the conditions of both EMF and EMF free. EMF speeds up corrosion of low carbon MgO-C refractories. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.