Effect investigation of a complex additive of chromium oxide, zirconia and a technological binder type on the properties of corundum refractories

The effect of a complex additive of chromium oxide and zirconium dioxide, as well as a temporary technological binder type on the properties of corundum refractories was studied. The optimal complex additive containing chromium oxide and zirconium dioxide in certain quantities, and the type of temporary technological binder have been determined. The use of these complex additive and technological binder provides to receive following properties of samples after firing at 1580 C open porosity 17.4 %, apparent density 3.29 g/cm3, cold crushing strength 138 N/mm2, refractoriness under a load of 0.2 N/mm2 > 1700 C thermal shock resistance (1300 C — water) of at least 8 heat cycles. Based on the research results, the required regulatory documentation has been developed. As a result of the studies, a technology for the semi­dry pressing of domestic corundum refractories based on fused corundum, α­alumina and active alumina with the complex addition of chromium oxide and zirconium dioxide was developed. This technology provides refractory products with high properties. The use of these products in the combustion chamber of production reactors of carbon black will provide their higher durability in service, and, consequently, the operation duration of high­temperature units.