Method for preparing aluminum oxide ultrafine spherical powder at low temperature

The invention relates to a method for preparing aluminum oxide ultrafine spherical powder at a low temperature. Aluminum powder and ammonium chloride hexahydrate or aluminum powder and ammonium chloride hexahydrate and aluminum chloride hexahydrate are uniformly mixed and are put into a corundum crucible; a cover is covered; then, the crucible is put into a high-temperature furnace; heat insulation is performed for 2 to 4h in circulation atmosphere at 1000 to 1500 DEG C; after the natural cooling, the aluminum oxide ultrafine powder is collected from the inside of the crucible and on the cover; the microscopic appearance of the powder is the spherical shape. The method has the characteristics that the synthesis temperature is low; the process is simple; the realization is easy; the cost islow. The aluminum oxide spherical powder prepared by the method provided by the invention can be applied to preparation of adsorbents, catalysts, catalyst carriers, functional ceramics, composite material enhancing agents an