Magnesite-spinel roof products with sintered magnesia-alumina spinel in the batch

Conclusions The basic production parameters were determined for magnesite-spinel refractories using sintered spinel. At the Experimental Factory of the Ukrainian Scientific-Research Institute of Refractories products were prepared having an open porosity of 9.3–12.5%, a compressive strength of 550–820 kg/cm², and a thermal shock resistance of more than 15 water-heat cycles.Petrographic studies established that a typical feature for magnesite-spinel refractories is the irregular granular structure and the development in large quantities of dense contacts between the grains and sections of the spinel and periclase bond, sometimes with partial (mutual) intergrowths. These features apparently determine the high ceramic and service properties of these refractories.Translated from Ogneupory, No. 7, pp. 40–46, July, 1972.