Fecha de publicación: 21/06/2022 Fuente: WIPO "circular economy" A fine powder screening system for a crushing process relates to the technical field of screening devices and comprises a collecting box, the top end of the collecting box is open, a plurality of supporting columns are installed on the two sides of the top end of the collecting box, a supporting plate is fixedly welded to the supporting column on each side, track plates are installed on the outer sides of the two supporting plates, and a plurality of transverse pulleys are installed on each track plate. Grooves are formed in the bottoms of the two sides of the screening box, the screening box is installed on the supporting plate in a sliding mode, a screen is installed at the bottom of the screening box, two fixing rods are installed on the lower middle portion of the screening box in parallel, and the two ends of the polishing column are installed between the two parallel fixing rods in a sliding mode. According to the denitration catalyst screening device, denitration catalysts are screened through the screening box, large particles are smashed through the grinding columns, and the problem that screening is not fine enough is solved. And meanwhile, the grinding column is in contact connection with the screen, the problem that denitration catalyst particles block the screen is solved through a grinding head on the grinding column, and the screening efficiency is improved.