Magnesium aluminate spinel aggregate was prepared by reaction sintering technique from its constituent oxides in a single firing process and the aggregate was used to develop alumina spinel castable. Different compositions were studied with variation in spinel content between 16 and 20 wt%. Other constituents used were WTA aggregates, bauxite aggregates, high alumina cements and additives. Developed castable was characterized for various properties both at dried and fired conditions
