RECOVERY METHOD OF ABRASIVES FROM ELECTRICAL INDUSTRY SLUDGE BY DRY CLASSIFICATION

摘要

The present invention relates to a method for recycling brown tube abrasive sludge by a dry method, and more particularly, a recycling method using sludge which is discharged into a cake state after concentration and dehydration of sludge composed of abrasive and glass scrap in a polishing process of a TV brown tube. A storage step of storing the cake sludge in a storage tank; An input process of adjusting the thickness of the sludge stored in the storage tank and inputting it to the rotary kiln; A primary crushing process of charging crushing medium into the rotary kiln so as to improve the drying efficiency of the sludge and impacting the sludge to crush the sludge firstly; A secondary crushing process of crushing the crushed sludge particles through a pin mill for secondary crushing; A first dry classification process of classifying the sludge particles according to the particle thickness by introducing the sludge particles which have been disintegrated into the primary air classifier; A recovery process for recovering sludge particles having a large particle thickness, storing the sludge particles having a small particle thickness in a particulate storage tank, and then recovering them using a dust collecting tank; And a secondary dry classification process in which sludge particles having a large particle size are added to the secondary air classifier and classified according to the particle thickness to classify the particles into permis particles and garnet particles.;According to the present invention made as described above can be greatly contributed to the supply and demand of abrasives and special cement raw materials by recovering garnet, perm abrasives and fine particles that can be used as a special cement and ready-mixed concrete admixture from CRT abrasive sludge have.