About magnetic separation & filtering

Information and selection aid on metal contaminant separation with magnetic filters.

Magnetic separator applications

Magnetic separators remove metal foreign bodies from your product streams.

Metal foreign bodies do not only contaminate your product, they can also cause serious damage to your machinery. If contaminants are not detected and removed, it may be necessary to recall products at huge costs and reputational damage.


Examples of metal contaminants - also called foreign bodies: staples, nails and screws, bolts and nuts that have vibrated loose, worn steel or stainless steel parts of machines, and rust particles due to corrosion.

Magnetic separators from Goudsmit Magnetics filter and remove metal contaminants from your product streams, in order to guarantee high product quality and prevent damage to machines.


Three good reasons to install a magnetic separator:


1. Magnets improve your product quality/purity

Contamination / foreign bodies in food products can lead to claims, very costly product recalls and reputational damage. And not just in the foodstuffs industry. Even the smallest foreign bodies are undesirable in pharmaceutical, chemical or mineral bulk streams and lower the quality of the finished product.


2. Magnets prevent damage to your production machinery

By placing a magnetic separator before the inlet of your production machinery – such as grinders, ball mills, pin mills, calenders and crushers – you prevent damage to your machinery and production standstill. A magnetic separator very effectively filters metal contaminants from your bulk stream. They function continuously and provide a high level of operational reliability.


3. Magnets prevent dust explosions

Fine dust in combination with oxygen and a source of ignition can result in dust explosions. By filtering metal particles out of the product flow in advance, magnets remove an important ignition source: the impact of metal on metal. This prevents serious injuries (or worse) and the high costs of damage caused to your machines.


Many of our magnetic separators are suitable for use in ATEX zone 20/21. As a certified manufacturer of ATEX equipment, Goudsmit has an externally certified quality assurance system that guarantees the explosion safety of our magnetic separators.

Cleanflow magnetic separator SECA (easy clean) - automatic cleaning | Goudsmit Magnetics

Magnetic separator vs metal detector

When do you need a magnetic separator and when do you need a metal detector?

A magnetic separator filters and immediately removes metal contaminants from the product flow and later removes them.


Magnetic separators

  • cause practically no product loss
  • are suitable for removal of regularly occurring and larger quantities of metal contamination.


A metal detector only detects. If you want to remove the metal particle, the production line has to be stopped, or a rejection mechanism has to eject the metal particle.


Metal detectors

  • mainly used as a means of inspection for sporadically occurring metal contaminations
  • cause a lot of product loss.


Watch our YouTube video on metal detection and separation below.

Types of magnetic separators

Goudsmit Magnetics supplies the following magnetic separators and filters:

Magnetic separators with plate or block magnets have a deeply penetrating magnetic field for capturing ferromagnetic metal particles as small as 1 mm.


Magnetic separator with plate magnets

The plate magnets are mounted on the outside of the pipe channel. Plate magnets, chute magnets and external pole magnets are used in pipeline transport. These systems are always permanently magnetic.


Magnetic separator with block magnets

Suspension magnets are large block magnets, with or without a conveyor system (overband magnets), that pull pieces of metal out of a material stream on a passing belt. Very suitable for magnetic recycling & sorting. These systems are permanently magnetic or electromagnetic.


Magnet separators with magnetic bars - magnetic fingers

Magnetic separators with magnetic bars have an extremely powerful yet less deeply penetrating magnetic field. They are mounted inside the product channel, making direct contact with the passing product. Magnetic bar separators are therefore best suited for trapping small ferrous contaminants and even weakly magnetic contaminants, e.g. cold-worked stainless steel, as small as 30 µm and are placed in filling openings and pipelines.


Our magnetic grids, Cleanflow magnets and magnetic filters make use of magnetic bars.


Magnetic separators with cylindrical magnets

You find cylindrical magnets in our bullet magnets, magnetic drum separators, magnetic head pulleys and eddy current non-ferrous separators. With the exception of the bullet magnet, these magnets dispose of the captured metal particles directly and continuously. They are therefore capable of separating or sorting large quantities of metal contaminations.


Bullet magnets and magnetic drum separators can be found in the solutions group "Magnetic filtering". Extra robust types of magnetic drum separators, magnetic head pulleys and eddy current separators can be found in the solutions group Magnetic recycling & sorting.

Magnetic separators | Goudsmit Magnetics