Eddy Current Separator: Difference between revisions

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*Very high purity rates
*Very high purity rates
*Compact and flexible
*Compact and flexible
*Removes ranging sizes of non-ferrous materials<ref name="ref1" />
*Removes ranging sizes of [[Non-Ferrous Metal|non-ferrous metals]]<ref name="ref1" />


==The Process==
==The Process==
{|  
{|  
|-
|-
|rowspan=4|[[File:Eddy Current Separator Process.png|450px|right|Eddy Current Separator Diagram. All Rights Reserved.]]<br clear=all>''Schematic Diagram of an Eddy Current Separator<ref name="ref3" />''|| 1. The waste stream is fed onto the conveyor belt and is transported towards the magnetic rotor end.
|rowspan=4|[[File:Eddy Current Separator Process.png|450px|right|Eddy Current Separator Diagram. All Rights Reserved.]]<br clear=all>''Schematic Diagram of an Eddy Current Separator<ref name="ref3" />''|| 1. The [[Waste|waste]] stream is fed onto the conveyor belt and is transported towards the magnetic rotor end.
|-
|-
| 2. When a piece of non-ferrous metal passes over the magnetic rotor, the magnets inside the shell rotate past the metal at high speed which forms eddy currents to create a magnetic field around the piece of metal.
| 2. When a piece of [[Non-Ferrous Metal|non-ferrous metal]] passes over the magnetic rotor, the magnets inside the shell rotate past the metal at high speed which forms eddy currents to create a magnetic field around the piece of [[Metal|metal]].
|-
|-
| 3. The polarity of that magnetic field is the same as the rotating magnet, causing the non-ferrous metal to be repelled away from the magnet.
| 3. The polarity of that magnetic field is the same as the rotating magnet, causing [[Non-Ferrous Metal|the non-ferrous metal]] to be repelled away from the magnet.
|-
|-
| 4. This repulsion makes the trajectory of the non-ferrous metal greater than that of the non-metallic, allowing the two material streams to be separated<ref name="ref2" />.
| 4. This repulsion makes the trajectory of [[Non-Ferrous Metal|the non-ferrous metal]] greater than that of the non-metallic, allowing the two material streams to be separated<ref name="ref2" />.
|}
|}


==References==
==References==
<references />
<references />

Revision as of 13:19, 2 November 2021

Eddy Current Separator Magnet Rotor and Splitter. Image: OKAY Engineering.
Eddy Current Separator Magnet Rotor and Splitter. Image: OKAY Engineering.

An Eddy Current Separator (ECS) is a machine that is used to separate and recover non-ferrous metals such as aluminium, copper and brass from non-metallic material in a waste stream[1]. Material is fed onto the conveyor of the separator, which moves it across the magnetic rotor, situated underneath, to cause in separation. The two resultant streams discharge into different bins/compartments with the aid of the splitter which divides the non-ferrous metal from the non-metallic waste such as paper, plastic, wood or automotive shredder residue (known as shedder fluff)[2]. This process is usually employed after magnetic separation has removed the bulk ferrous fraction from a scrap material stream[3].

The Magnet Rotor

The key component is the magnetic rotor, which is a series of permanent rare earth magnets mounted on a support plate attached to a shaft. The magnetic rotor is surrounded by, but not attached to, a non-metallic shell which supports the conveyor belt. This allows the rotor to spin independently and at a much higher speed than the non-metallic shell and belt[2].

Benefits

  • Very high hit rates
  • Very high purity rates
  • Compact and flexible
  • Removes ranging sizes of non-ferrous metals[1]

The Process

Eddy Current Separator Diagram. All Rights Reserved.
Eddy Current Separator Diagram. All Rights Reserved.

Schematic Diagram of an Eddy Current Separator[3]
1. The waste stream is fed onto the conveyor belt and is transported towards the magnetic rotor end.
2. When a piece of non-ferrous metal passes over the magnetic rotor, the magnets inside the shell rotate past the metal at high speed which forms eddy currents to create a magnetic field around the piece of metal.
3. The polarity of that magnetic field is the same as the rotating magnet, causing the non-ferrous metal to be repelled away from the magnet.
4. This repulsion makes the trajectory of the non-ferrous metal greater than that of the non-metallic, allowing the two material streams to be separated[2].

References