Device and method suitable for separating aluminum alloy polishing aluminum powder and invalid polishing sand

The invention discloses a device and method suitable for separating aluminum alloy polishing aluminum powder and invalid polishing sand, and belongs to the technical field of physical separation. The method specifically comprises the following steps that S1, a first circulating pump is used for circulating upper-layer waste liquid in a waste pool, and a circulating medium is water carried by polishing waste liquid; the waste liquid is pumped into an aluminum powder separator, and aluminum powder is separated out through a filter element with the filtering precision being 1-5 microns in the aluminum powder separator; s2, a second circulating pump pumps the polishing sand on the middle lower layer of the waste pool into a large-particle separator, and a stainless steel filter screen with the aperture of 80 micrometers is installed in the large-particle separator to conduct first-time filtering separation on the polishing sand; and S3, a third circulating pump is used for conducting secondary separation on the p