Separation of Metallic Fragments from Shredded Electric Devices Using Air Table

Precious metals are recycled from electric devices. In this study, metallic fragments from shredded mixture were separated using an air table. The air table has a shaking deck motion similar to a wet table and a blast of air is driven through a perforated deck. Several experiments were carried out to demonstrate the effect of frequency, slope angle of the inclined deck and air velocity on separation efficiency. The results indicated that the end slope of inclined deck exerted a great influence of the separation of metallic fragments. The optimum treatment condition was as follows: The angle of slope was 6.5 degrees, frequency of shaking deck was 500 min -1, and air velocity were 1.0-2.0 m·Es-1. The overall separation efficiency at that time was 0.95.