Magnetic separator

01

Describe burden depth, belt speed and the iron to catch

Eriez, a magnetic separation manufacturer, lists the factors that decide collection: as belt speed rises it becomes harder to remove ferrous pieces, and larger, stronger electromagnets may be needed; as burden depth rises, more field strength is needed; small pieces of 1–2.5 cm may be very hard to remove under a deep overburden compared with shovel teeth, rail spikes or rebar. [1]

Shape matters too: Eriez notes that flat plates and rod-shaped pieces are easier to remove than spheres or cubes because of their higher surface-area-to-weight ratio. [1]

Ask the supplier to size the magnet for the deepest burden and fastest belt you run, and for the smallest compact piece you must remove, not for the average case.

Give the supplier belt width and speed, burden depth, material type, bulk density, lump size and moisture, throughput, and the size, shape and frequency of the iron to be removed.

02

Choose suspended magnet, head pulley or drum

Eriez describes suspended (overband or cross-belt) magnets hung above the belt: permanent ceramic-magnet versions need no power, while suspended electromagnets have a deeply penetrating field for heavy burdens on fast belts and can be switched off for cleaning or service. [1]

A magnetic head pulley replaces the conveyor's end pulley: magnets inside hold ferrous metal to the belt until it passes under the end, while non-magnetic material continues downstream. Eriez offers ferrite and rare-earth pulleys from 200 to 1,200 mm diameter and 500 to 2,000 mm wide. [2]

Drum separators feed material over a rotating shell with internal magnets, splitting magnetic and non-magnetic streams; suppliers linked to this page list dry and wet drum separators for minerals and recycling. Eddy-current separators, also listed, separate non-ferrous metals. [4] [6] [5]

03

Decide how collected iron is cleaned off

Eriez's self-cleaning suspended magnets run a short rubber belt around the magnet face to carry iron away continuously; manual-cleaning models are moved to a dump point and, for electromagnets, switched off, and are recommended where iron concentration is low or for work-hardened stainless steel. [1]

Ask the supplier how often a manual unit must be cleaned at your iron load, how the discharge is guarded, and what happens to separation if cleaning is missed.

04

Compare what suppliers offer

Suppliers linked to this page list suspended and overband magnets, drum and grate separators, dry electromagnetic separators and eddy-current separators. [3] [5] [6]

Great Magtech lists magnetic separator conveyors, dry electromagnetic separators and grate hopper magnets, and on a second site suspended magnets and drum separators for mining; GTEK lists overband magnets, eddy-current separators and magnetic filters; Ruijie lists magnetic and eddy-current separation for resource recovery. [3] [4] [5] [6]

05

Trace the magnetic separator components

This is a functional reference built from the sources cited; it is not one maker's parts list.

06

Fill the specification fields with values for your stream

A magnetic separator quotation needs stream-specific values. The table explains each field, gives published values where a reviewed source states them, and says what to obtain from the supplier.

07

Send the stream, belt and tramp-metal data together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Stream: [material; bulk density; lump size; moisture; temperature; throughput]
Conveyor: [belt width; belt speed; burden depth; trough angle]
Iron: [smallest piece size; shape; frequency; work-hardened stainless]
Design: [suspended, head pulley, drum or grate; permanent or electromagnet; in-line or cross-belt]
Cleaning: [self-cleaning or manual; discharge point]
Documents: [field strength at working distance; drawings; manual]

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