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 EDAX. The results show that in induction furnace having e-lectromagnetic field(EMF), the high temperature phase is density in the permeation layers. There are magnesium-iron and magnesium-manganese solid solution in the interface. The low melting phase is monticellite [CaMg(Fe、 Mn) SiO4] containing a little MnO and FeO. While under the condition of EMF free, there is not solid solution in the interface. The low melting phases are calcium silicate(Ca-SiO3), manganolite(Ca3MgSi2O8) and monticellite(CaMgSiO4). At high temperature, EMF increases the diffusion coefficient of Fe2+/3+ ions, which displaces Mg2+and forms magnesium-iron/magnesium-manganese solid solution. There are spinel phase(MgAl2O4 )in the penetration layers under the conditions of both EMF and EMF free. EMF speed corrosion of low carbon MgO-C refractories.
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