Eddy Current Separator Systems

Eddy Current Separator Systems

The Eddy Current Separator is an advanced metal sorting unit that is capable of separating non-ferrous metals such as aluminium and copper from dry recyclables. Non-ferrous separators are very common in the fast growing market of beverage can sorting, where they can provide an accurate separation of aluminium cans from waste streams.

The Eddy Current Separator is applied to a conveyor belt carrying a thin layer of mixed waste. At the end of the conveyor belt is an eddy current rotor. Non-ferrous metals are thrown forward from the belt into a product bin, while non-metals simply fall of the belt sue to gravity. Eddy current separators may use a rotating drum with permanent magnets or may use an electromagnet depending on the type of separator.

Operating Principles

An Eddy Current Separator consists of a short belt conveyor that has its drive located at the return end and a high speed magnetic rotor system installed at the discharge end. The magnetic rotor, which is positioned within a separately rotating non-metallic drum, revolves at around 3000 revolutions per minute during operation whilst the outer drum cover rotates at the speed of the Eddy Currents’ belt conveyor.

As the rotor spins at these high speeds, an electric current is induced into conducting metals. The induced electric current produces a magnetic field, which opposes the field created by the rotor, repelling the conducting metals over a pre-positioned splitter plate. The remaining materials such as plastics, glass and other dry recyclables will simply free-fall over the rotor, separating them from the repelled metals.