Low-Temperature Preparation of Feldspar-Corundum Composite Ceramics from Red Mud

Using bayer red mud as the main raw material, adding vanadium clay clinker and lithium porcelain stone, feldspar-corundum ceramics were prepared at low temperature. The phase composition and morphology of ceramics were analyzed by X-ray diffractometer (XRD) and scanning electron microscope (SEM). The effects of the amount of red mud and sintering temperature on the volume density, shrinkage, water absorption, porosity and compressive strength of ceramics were studied. The results show that: When the amount of red mud is 60% and the sintering temperature is 1 050 ℃, the properties of the multiphase ceramics are the best, and the phase composition is anhydrite, corundum, hematite, quartz, glass phase and a small amount of mullite phase. The volume density is 1.85 g/cm³, the shrinkage rate is 7.34%, the water absorption rate is 19.87%, and the compressive strength is 79.48 mpa. The dissolution experiment of harmful components further showed that sodium, potassium, calcium and other harmful elements were stabilized in the product, which has a wide application prospect in the field of wall decoration and refractory materials.