Essential information for end of life vehicle dismantling, depollution and recycling

Adam Hewitt
OHRA
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Bunting – New Stronger ElectroMax-Plus Overband Magnet

The design objective of creating a more compact and powerful electromagnetic Overband Magnet led the Bunting engineering team to develop the new ElectroMax-Plus.

 

Bunting - New Stronger ElectroMax-Plus Overband Magnet feat
Figure 1 – Bunting’s ElectroMax-Plus Overband Magnet

Bunting is one of the world’s leading designers and manufacturers of magnetic separators, eddy current separators and electrostatic separators for the recycling and waste industries. The Bunting European manufacturing and product testing facilities are in Redditch, just outside Birmingham, and Berkhamsted, both in the United Kingdom.

Electromagnetic Overband Magnets use an oil-cooled or air-cooled wire coil to generate a deep and strong magnetic field. The electromagnetic force radiates from a coil wound around a steel core and mounted inside a steel box with a thick steel back-bar. This focuses the magnetic field in one direction: down towards the conveyed material. In operation, an Overband Magnet, suspended over conveyors, screens, and vibratory feeders, lifts and removes ferrous metals such as iron rebar and beverage steel cans.

Bunting - New Stronger ElectroMax-Plus Overband Magnet p
Figure 2 – Bunting’s ElectroMax-Plus Overband Magnet

Overband Magnets are a common feature on many mobile screens and crushers.  In such applications, minimising weight and size is crucial and, subsequently, operators use standard Ceramic Ferrite or, less frequently, Neodymium Rare Earth Permanent Overband Magnets rather than Electromagnets.

Neodymium Permanent Overband Magnets produce a strong but shallow magnetic force and often experience problems with belt and motor damage due to large ferrous metal clamping against the magnet block. The magnetic field of the light and compact ElectroMax-Plus is both deep and strong, enabling excellent separation performance at higher suspension heights. In addition, simply turning off the electromagnet releases any extremely large entrapped tramp ferrous metal. The shape and nature of this magnetic field mean there is less wear to the self-cleaning belt mechanism (e.g. belt, motor gearbox, and bearings).

The new ElectroMax-Plus operates at a 600mm suspension height (the distance between the conveyor belt and the face of the Overband Magnet), up from 450mm on a standard ElectroMax. At a suspension height of 500mm, the ElectroMax-Plus is over 105% stronger (in terms of Force Index) that the equivalent ElectroMax. This incredible additional magnetic force removes small tramp ferrous metal commonly missed by permanent Overband Magnets.

The latest ElectroMax-Plus provides companies in the recycling, quarrying, and mining sectors with a powerful and compact solution for separating tramp and secondary ferrous metal from conveyors.

“Companies supplying mobile recycling equipment are requesting stronger and lighter Overband Magnets,” explained Adrian Coleman, the General of Bunting’s Redditch operation. “The new ElectroMax-Plus provides a real alternative to Neodymium Rare Earth Overband Magnets. There is the requested additional magnetic strength, without the operating problems [as experienced with some Neodymium Rare Earth Overband Magnets].’

The new ElectroMax-Plus extends Bunting’s comprehensive range of Overband and Suspension Magnets. In addition to standard sizes, Bunting also designs and manufacturers bespoke models which are application-specific.

Additional information on metal recovery and separation using the ElectroMax-Plus Overband Magnet, ElectroStatic Separators, Magnetic Separators, and Eddy Current Separators is available on the Bunting website www.mastermagnets.com

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