Calcium hexaluminate and corundum composite porous light heat insulation refractory material and preparation method thereof

The invention relates to a calcium hexaluminate and corundum composite porous light heat insulation refractory material, in particular to a high-quality refractory material for high temperature kiln liners, which has the advantages of low heat conductivity, high strength, high stability in high-temperature reducing atmosphere, high alkali and scouring corrosion resistance and long service life, and belongs to the technical field of refractory materials. The main phases of the refractory material are a calcium hexaluminate phase and a corundum phase; and the main chemical compositions of the refractory material are Al2O3 and CaO which account for over 95 weight percent. CaCO3, Ca(OH)2, CaO and the like are taken as calcium sources, and Al2O3, Al(OH)3 and the like are taken as aluminium sources; and a preparation method comprises the following steps of: uniformly mixing Al2O3 and CaO according to a molar ratio of more than 6, grinding, adding a certain amount of pore-forming material, uniformly stirring, and performing a series of technological processes such as forming, drying, sintering, cutting and the like to prepare the calcium hexaluminate and corundum composite porous light heat insulation refractory material. The heat insulation refractory material is a light refractory brick for the high temperature kiln liners, which has the advantages of low heat conductivity, high strength and long service life, and can provide high-efficiency and energy-saving guarantee for industrial furnace equipment.