Corrosion Behavior of MgO-C Refractory in the Electric Arc Furnace that Entirely Uses Direct Reduced Iron as Raw Materials

The corrosion behaviorCorrosion behavior of MgO-C refractoryRefractories in electric arc furnace (EAF) slagsElectric arc furnace slag was investigated by adopting a rotating immersion method (25 r/min) at 1823 K. The EAF entirely uses direct reduced ironDirect reduced iron as raw materials, and the change of refractory radius, MgO content in slag, and contact angle were studied at various slag basicity conditions. The results showed that the reduction of radius diminished as the slag basicity increased from 1.6 to 2.47. The slag with higher basicity has a larger contact angle compared to lower basicity slags. In addition, the MgO solubility increased with a decrease in basicity and an extension of exposure time and subsequently stabilized after 60 min. The reduction of FeOx and the formation of a magnesiowüstite (MW) intermediate layer occurred within the refractoryRefractories. The MW layer is thicker in cases of low-basicity slag, but the slag penetration is deeper, leading to severe erosionErosion.