
77Beneficiation Technology
by agitating the contents. This keeps paper and metal pieces from sticking together
or blocking each other’s path. Zigzag classiers have also been applied for metal
recovery from auto shredder uff (Phillips, 1996).
Figure 5.10 depicts an air table, widely used for metal recovery from shredded
wire and cable (Phillips, 1996; Sullivan, 1985). This material has a small particle
size and thus needs to be processed more gently than the large pieces fed to vertical
air classiers. Unseparated material fed in the box at the top left is gently shaken
as it moves along the sloping table toward the discharge at the far end. A ...