Improved method for preparing aluminum oxide for filler through aluminum alcoholization method

The invention discloses an improved method for preparing aluminum oxide for filler by an aluminum alcoholization method, and belongs to the technical field of chemical production processes. The method comprises the following steps: firstly, preparing high-purity aluminum hydroxide powder by adopting high-purity aluminum, anhydrous isopropanol and high-purity water as raw materials and adopting an alkoxide hydrolysis method; the preparation method comprises the following steps: calcining aluminum hydroxide powder according to two calcining processes to respectively obtain alumina powder A and alumina powder B, and mixing the alumina powder A and the alumina powder B according to a weight ratio of (10-15): (90-85) to obtain mixed alumina powder; performing jet milling treatment on the mixed aluminum oxide powder to obtain aluminum oxide fine powder; adding high-purity water into the mixture, and fully stirring to obtain aluminum oxide slurry; and finally, carrying out spray drying to obtain the aluminum oxide p