Phase evolution behaviour of dolomite-alumina system

Abstract

Magnesium Aluminate Spinel Refractories are usually prepared by sintering from Calcium Aluminate Cement and Synthetic Mag-Al spinel. But the high cost of electrofused or sintered spinels is a hindrance and hence a suitable alternative is required. Dolomite and calcined alumina can be used for the synthesis of refractory aggregates containing calcium aluminate and spinel that have extensive applications. Spinel phase provides high slag resistance and high thermo mechanical resistance and Calcium Aluminate Cement is commonly used hydraulic binder.So by reaction sintering of dolomite and calcined alumina pellets of 1:2,1:3 and 1:7 compositions by mole ratio sintered at 12000C,13000C,14000C and 15000C, such refractory compositions were synthesized. The phase evolution was studied and quantified by XRD analysis and the physical and mechanical properties were measured.