When a non-ferrous metal item passes through a magnetic field, eddy-currents are generated within the item. These induce a magnetic field around the item. This magnetic field is used to repel non-ferrous metallic items.
The principle is used in Longi Eddy-current Separators to remove aluminium, copper and non-ferrous metals from municipal and other waste. A suitable Longi magnet is used prior to the Eddy-current Separator to remove ferrous items first as they will cause damage to the eddy-current system.
Longi Magnet Co Ltd is able to supply complete systems for recycling including conveyors, magnets and Eddy-current Separators and is represented in Australia by Serpent and Dove® Pty Ltd.