The product roasted between 400 and 700 ℃ γ- Al2O3 is widely used as a catalyst carrier, catalyst, and adsorbent; Nanoscale can be obtained by calcination between 1100 and 1200 ℃ α- Al2O3 is widely used as a coating additive, high-end ceramics, high-efficiency catalyst in petrochemical industry, submicron/nanoscale grinding and polishing materials, cosmetic fillers, and inorganic membrane materials. It is a new type of material with broad development prospects.