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

摘要

Using MgO-C refractories containing 6% carbon and the slag with a basicity (CaO/SiO_2) 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 MgFe_2O_4 spinel with a little of Mn ions generated in the interfacial layer. Part of the solid solution is monticellite [CaMgSiO_4] containing a little MnO and FeO. While under the condition of EMF free, there is not MgFe_2O_4 spinel in the interfacial layer and the solid solution is monticellite (CaMgSiO_4). At a high temperature, EMF increases the diffusion coefficient of Fe~(2+/3+) ions, which displaces Mg~(2+) and forms MgFe_2O_4 with a little of Mn ions. There are MgAl_2O_4 spinel in the penetration layers under the conditions of both EMF and EMF free. EMF speeds up corrosion of low carbon MgO-C refractories.