Effect of spinel content on the properties of Al2O3–SiC–C based trough castable

Effect of addition of spinel on the various refractory properties of Al2O3–SiC–C based trough castable is studied with both cement and sol bonding systems. Graphite as C source varied between 2 and 4 wt% and spinel between 5 and 10 wt%. Different castable compositions were processed as per conventional processing and heat treated at 900 and 1500 °C. Increasing amount of graphite resulted in reduced densification and strength properties for both the bonding systems at all the processing temperatures. An increasing amount of spinel and sol bonding were found to improve the corrosion resistance. Lime, silica and iron oxide were found to be the main corroding and penetrating components of blast furnace slag.