Abstract: An apparatus for separating aluminum scrap material from copper, brass and zinc scrap materials, the apparatus including a hopper having a weir on one side, a first fluid nozzle on the other side of the hopper for directing a stream of water having a specific gravity greater than aluminum over the weir, and a chute located above the fluid nozzle for directing the scrap material onto the stream of water so that the aluminum scrap passes over the weir and the rest of the scrap falls into the hopper.

Abstract: A magnetic repulsion assembly for separating copper particles from zinc particles, the assembly including a magnetic pulley having a radially decreasing flux density field surrounding the pulley, a belt wrapped around the magnetic pulley for supporting the particles and a resilient pulley mounted in close proximity to the magnetic pulley whereby the copper particles will be rotated into engagement with the surface of the resilient pulley and thrown outwardly therefrom at a greater trajectory than the zinc particles.

Abstract: A magnetic repulsion separator for separating a mixture of discrete particles having various electroconductivity characteristics, the separator including a main shaft, a pair of main bearings for supporting the shaft, a hollow rotor mounted on the shaft and having an even number of axially aligned notches around the outer perimeter thereof, a row of permanent magnets in each of the notches, each alternate row of magnets having opposite polarity, an outer nonmagnetic shell mounted for rotary motion on the main shaft and encircling the hollow rotor for carrying the discrete particles of material and a nonmagnetic mesh wrapped around the rows of magnets with a nonmagnetic adhesive provided in the spaces between the rows of the magnets.