Abstract
Basic bricks containing chromium based complex spinel are used in the nonferrous industry due to their corrosion resistance against fayalite-type slags. Objective of this work is to replace Cr3+ with Me4+ ions that form complex spinel. The incorporation of iron oxide in the MgO-Al2O3-Me4+O2 systems contributes to reactive sintering. The mixes contain 60 wt.% MgO similar to most basic refractories used in non-ferrous converters and thus called “magnesia-rich” compositions. The investigation shows that incorporation of nano-oxides reduces the temperature of spinel formation and activates both synthesis and sintering. Magnesia-rich compositions with Al2O3, Fe2O3, SnO2 and TiO2 containing less than 3 wt.% nano-oxides fired at 1450 °C for 3 hours have resulted in formation of complete spinel solid solution and less than 5% open porosity.
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