Multi-stage screening system for superfine aluminum hydroxide micro powder

The invention discloses a superfine aluminum hydroxide micro powder multi-stage screening system, and belongs to the technical field of micro powder screening. The system comprises a screening barrel, and a filtering assembly and a collecting assembly are arranged in the screening barrel; the filter assembly comprises a filter cartridge, a first filter screen and a second filter screen which are arranged layer by layer from inside to outside, the mesh apertures of the filter cartridge are sequentially reduced, the filter cartridge is connected with an air supply device, and aluminum hydroxide micro powder is blown out and graded layer by layer along the filter cartridge, the first filter screen and the second filter screen through wind power; a transmission assembly is connected between the first filter screen and the second filter screen, so that the first filter screen and the second filter screen rotate to form centrifugal force to assist in step-by-step screening of the aluminum hydroxide micro powder; th