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Effects of some kinds of alumina on physical properties of high-purity andalusite based refractory were studied, and, effects of type and amount of added alumina on phase composition and microstructure of the refractory were investigated by XRD and SEM. The results revealed that the sintering property of the refractory sample without added alumina was better than that of one with added alumina, whereas the effect of a selected sample of added alumina on the sintering property of the high-purity andalusite based refractory was related to the purity and activity of the added alumina sample. The SiO2 glass phase originated from the decomposed andalusite aggregate cannot wholly react with added alumina to form secondary mullite. Moreover, when the quantity of added alumina amounted to about 15% (mass percent), more extensive secondary mullitization and greater expansion will be observed in the experimental sample.

Study On Application Of Alumina In High-Purity Andalusite Based Refractory