Two kinds of commercially available preformed magnesia
alumina spinels, characterized through chemical analysis and
X-ray diffraction methods, were utilized in different concentrations
in a high alumina based refractory castable composition.
After being fired at elevated temperatures, those two types of
spinel bonded castables were characterized and compared with
regard to bulk density, apparent porosity, cold crushing strength,
spalling resistance, volume shrinkage, and flexural strength.
XRD-phase analysis and SEM studies of some selected heattreated
samples were done to understand the interaction of spinel
fines in the microstructure of the castables. The performance of
these two types of castables was also verified by slag corrosion
resistance test. |