Corrosion of MgO by alumina-containing slags

The drop quench technique has been used to investigate the corrosion of MgO crucibles at 1500 degrees Celsius in air using the CaO-SiO2-MgO-Al2O3 slag system. Following the slag attack for 2 h or more, clusters of newly-formed crystals containing Mg, Fe and Al, presumably spinel, were observed to be separated from the MgO surface by a slag region of relatively constant thickness of about 150-200 μ