Composition and Refractory Properties of Mixtures of Moroccan Silica-Alumina Geomaterials and Alumina

Abstract

Five mixtures (M1 to M5) of\rsilica-alumina geomaterials and two varieties of alumina (AP and AR)\rwere used for the elaboration of mullite refractory materials between 1500℃ and 1600℃. An X-ray diffraction (XRD) analysis showed that\rthe refractory samples are composed of mullite, corundum and silica. The length\rof the mullite crystals was measured by a method of image analysis of\rscanning electron microscopy (SEM). Chemical and mechanical properties of these\rmaterials were investigated and correlated with their microstructure. Resistance towards Acid Attack test showed\rthat the refractory samples present good resistance, as well as, the alumina\rpowder AR obtained from waste of silica-alumina bricks proves to be\refficient for an eventual use.