Tel: +27 (0)11 473 2521

Tramp Iron Removal

Suspended Permanent Overband Belt Magnets

Send Enquiry
Permanent [Rare Earth NdFeB or Ceramic Ferrite]
Application Summary
materials handling, quarrying & aggregate, Recycling, Tramp metal removal for mining

The MAGQUIP range of permanent suspended Overband Magnets are installed above conveyor belts and used for removing unwanted contaminant tramp iron that can damage conveyor belts and downstream processing equipment and separating steel and metal product in metal reclamation and recycling operations. These overband magnet separators are also commonly found on mobile crushing and screening plants.

MAGQUIP uses, as standard, its triple pole magnet design on all overband magnets regardless of magnet size and application. The triple pole magnet design utilises a stack of permanent magnet blocks between thick carbon steel side poles and backbar. Using the correct proportion of steel for the poles generates a formidably strong magnetic field, comparable in performance to an electromagnet as certain operating gaps but without the cost and complexity of electromagnets and their associated cost of ownership.

The MAGQUIP PERMABAND triple pole magnet arrangement can be used with both Ceramic ferrite and Rare Earth (NdFeB) magnets.

These permanent suspension magnets can be installed over the head pulley in an “in-line” installation or across the belt in a “cross belt” style.

In applications with more high levels of ferrous metal/tramp metal contamination a “self-cleaning” (SC) type belt magnet is preferred using an automatic belt cleaning system for metal discharge. If the tramp iron or steel to be separated is relatively infrequent then a static or manual cleaning (MC) type with a hinged cleaning plate is used.

Permanent Suspended magnets work by stacking permanent magnet blocks vertically and within high permeability steel poles and backbar. These three poles, when using the optimum saturated thickness of steel, concentrate the magnetic flux to the magnet face where its strongest and then is able to easily attract ferrous metal that enters the magnetic field to its face. For a self-cleaning overband (SC), this attracted steel is then discharged and pulled away from the magnet face by a series of wiping strips on the cleaning belt which is part of the self-cleaning belt mechanism (driven by a pulley with direct drive geared motor and tail pulley).

For manual/static type permanent suspended magnets, cleaning of collected ferrous metal form the magnet face is achieved by moving the magnet away from the conveyor and then using a hinged cleaning plate made from non-magnetic steel with a handle.

Used on conveyor belts from 300 mm to 1000 mm wide and can be mounted in applications with operating gaps up to 500 mm.

Extraction of unwanted tramp iron from conveyor belts

Recovery of ferrous metal in metal reclamation and recycling operations

  • Entire Range consists of triple pole magnet circuit ensuring suitable flux density and gradient at large operating gaps
  • Performance is unaffected by vibration, moisture, or atmospheric conditions
  • No expensive and complex DC electrical power supply/transformer rectifier needed.
  • Permanent magnets require no electrical power, very low Total Cost of Ownership
  • Classified safe for use in hazardous locations (ATEX) for dust and gas groups
  • Fully enclosed guarding fabricated steel guarding for pinch point and nip angle safety
  • Low profile design suitable for areas with space constraints

Magnet Circuit:

C8A ceramic ferrite / N38H NdFeB Rare Earth permanent magnet with triple S355JR Carbon steel poles

Pulley support framework:

S355JR Carbon steel Carbon steel parallel flange channels


Carbine Type from schedule pipe, diamond back rubber lagged with crowning

Pulley Guards:

Fabricated carbon steel frame with expanded metal mesh

Cleaning belt:

Synthetic rubber and polyester conveyor belt and AISI 304 Cleaning strips


Drive and tail pulleys square flange type

Geared motor:

SEW K type Gear Box helical bevel type with Premium Efficiency 4 pole motor TEFC motor