Effect of Fe_2O_3 Addition in MgO-CaO Refractory on Desulfurization of Liquid Iron

摘要

The effects of Fe_2O_3 addition in MgO-CaO refractory on desulfurization of liquid iron were studied by SEM, EDA and chemical analysis. Fe_2O_3 of 1 percent and 4 percent were added to MgO-CaO refractory as the lining of graphite crucible in which 150 g iron powder with sulfur of 0.15 percent was charged. It is found that when the sample is heated at 1600 deg C for 40 min, 60 min and 90 min, the addition with Fe_2O_3 of 1 percent improves desulfurization greatly. However, the desulfurization ratio of the refractory with Fe_2O_3 addition of 4 percent is less than that with Fe_2O_3 addition of 1 percent. For the soaking time of 90 min, the desulfurization ratio is less than those of 40 min and 60 min. These phenomena were explained by the contrary roles of O~(2-) and Fe~(2+) formed by reaction between liquid iron and Fe_2O_3 on desulfurization.