Features of the production technology and the properties of the components made from Al2O3 and SiO2 of different particle-size distributions

Conclusions It is recommended that the mullite-silica products made from polydispersed mixtures of alumina and silica in the presence of oxide additives be fired at a temperature of 1380–1410°C according to the firing regime of the dinas refractories. We obtained products containing a mixture of iron and calcium oxides (maintaining their total content not exceeding 3% and a 21 ratio). Oxide additions exceeding 3.5% have a negative effect on the technological effectivenesss and the properties of the products.In the absence of additives, mullite-silica products must be fired at 1550–1600°C maintaining the heating and cooling rates below 30°C/h. The mullite-silica products based on the polydispersed mixtures of corundum and crystalline quartz are recommended for the linings of the units used in the production of steel and cast iron and for lining coke-ovens and other thermal units (furnaces).Translated from Ogneupory, No. 7, pp. 9–12, July, 1988.