Electromagnetic field effects on the formation of MgO dense layer in low carbon MgOC refractories

Electromagnetic field (EMF) would speed up the corrosion of low carbon MgOC refractories. Its influence mechanism will be investigated in this paper. The slag-resistance experiments of low carbon MgOC refractories were carried out under the condition of an induction furnace and a resistance furnace, respectively. Low carbon MgOC refractories with carbon of 6% (in mass) and a slag with the basicity (CaO/SiO2) of around 0.87 were used in the experiments. The slag line of MgOC refractories corroded by the slag under the different conditions were analyzed by X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The results show that in the induction furnace with an electromagnetic field (EMF), no MgO dense layer exists in the interface. However, MgO dense layer could be formed in the interface without any EMF. The formation mechanism of MgO dense layer indicates that the EMF could enhance the solution of MgO and power of Mg (g) discharge. As a result, EMF restrains the formation of MgO dense layer.