The application relates to the technical field of inorganic material preparation, in particular to a preparation method of
boehmite, which comprises the following steps: S1, placing aluminum
hydroxide in a
ball mill jar and performing
dry grinding by using a planetary
ball mill; S2, placing the aluminum
hydroxide powder after ball milling in a
crucible to perform first-stage heating, and the first-stage heating is from
room temperature to 200 DEG C; S3, performing second-stage heating, the second-stage heating is from 200 DEG C to 300 DEG C-400 DEG C, and staying at the terminal temperature of the reaction for 0.5 h; S4, after the heating reaction is completed, cooling to
room temperature, and collecting the obtained
white powder; and S5, screening and removing the
magnet from the collected
white powder to obtain the final product
boehmite. The preparation method of the
boehmite is simple in synthesis
process operation, high in safety, low in requirement for equipment, low in cost and excellent in economy.