Spinel type fused refractory product

摘要

A spinel type dense fused refractory product having excellent corrosion resistance comprises a crystalline structure consisting essentially of more than 50% by weight of composite spinel phase comprising RO component selected from MgO and FeO and R'2O3 component selected from Cr2O3, Al2O3 and Fe2O3 and periclase phase and a small content of glass matrix phase which consists essentially of the following constituents, analytically on a weight basis; a ratio of Cr2O3 to Al2O3 of 3.5 to 5.5; and 20% to 40% of MgO; 1.5% or less of CaO; 15% or less of Fe2O3 (FeO is also calculated for Fe2O3) and 5% or less of SiO2.