Dealkalizing method of Bayer process red mud

The invention relates to a dealkalizing method of Bayer process red mud, in particular to a treatment method of the red mud in the process of producing aluminum oxide with a Bayer process, and belongsto the technical field of aluminum oxide production. The dealkalizing method includes the specific steps that firstly, the red mud is ground, the surface of the red mud is updated, then the red mud with the updated surface and lime milk are mixed, the mixture is subjected to a dealkalizing reaction, red mud slurry obtained after the dealkalizing reaction is washed and subjected to liquid-solid separation, a solution containing alkaline can be obtained, an aluminum oxide production process is executed again, and after separation is completed, the red mud with the low alkaline content is fed toa red mud dam to be piled up. The process is simple, the specific area of the reaction can be effectively increased, the mass transfer difficulty in the reaction process is reduced, and therefore thedealkalizing effect is imp