Eddy current separator for non-ferrous metal and non-ferrous metal sorting
Eddy Current Separator is used widely in the recycling industry to either recover or remove non-ferrous metals from non-metallic materials. Different designs enable the separation of small (down to 3mm) and large non-ferrous metals.
The Eddy Current Separator (ECS) utilises magnetic forces to physically repel non-ferrous metals and enables separation from non-conductive materials. The eddy current separator is often supplied as part of a metal separation module with a first-stage drum magnet removing ferrous metals.
To maximise the separation and recovery of non-ferrous metals, Baonan machine has developed two different eddy current separator models:
** High-Intensity Eccentric ECS – for small non-ferrous metals down to 3mm;
** High-Intensity Concentric ECS – for small non-ferrous metals down to 10mm;
Eddy Current Separators commonly form part of a Metal Separation Module as a two-stage metal separator. Material initially passes over a Permanent Drum Magnet to remove and recover ferrous metals, leaving a non-magnetic fraction. The Eddy Current Separator then separates non-ferrous metals from the non-conductive remains.
An eddy current separator is a dual pulley conveyor system, where the non-metallic rotor cover houses an independently rotating high-speed magnetic rotor. Separation occurs when a non-ferrous metal particle (e.g. aluminium, copper or zinc) is conveyed into the magnetic zone. The non-ferrous metal particle is exposed to rapidly changing magnetic polarity. This induces ‘eddy currents’ into the particle generating an electrical current (Fleming’s left-hand rule) that subsequently creates its own magnetic field. The two magnetic fields oppose each other (i.e. North vs North pole repulsion), causing the repulsion of the non-ferrous metal particle and change in trajectory. The measured positioning of a splitter enables the separation of non-ferrous metals from non-metallic material due to the altered and unaltered material trajectories.
The speed of the magnetic rotor is dependent on the number of poles on the magnetic rotor and the application.
Eddy current separators are used to either recover non-ferrous metals for recycling (e.g. shredded cars, aluminium beverage cans from waste) or to cleanse a waste material of non-ferrous metals (e.g. cullet, plastics).
** recovery of coarse to fine non-ferrous metals from slag from waste incineration plants
** recovery of precious metals from scrap or electronics waste
** recovery of casting residues in the metal casting industry
** elimination of metals out of shredded wood chips
** elimination of aluminium for the glass recycling industry