Magnets and Eddy Current for iron and non-ferrous metals.

BULK .ID supplies machines that, based on magnetism, remove iron and non-ferrous metal from a material stream. The overhead magnet, the magnetic head pulley and the magnetic drum sort and separate the iron. The non-ferrous separator (also called Eddy Current) with eccentric pole system also recovers valuable non-ferrous metals such as aluminum, copper and zinc.

Overhead suspension magnets

STEINERT overhead suspension magnets have been recovering iron and ferrous components from bulk material for many decades. They not only generate clean iron scrap for recycling but also protect crushers, mills and other mining processing equipment against wear and destruction.
They therefore remove unwanted ferrous parts such as screws, nuts and rock bolts from coal, coke, ore and other minerals – and they do this at very high belt speeds, over large working distances up to 1 m and during aggregate material transport.

The operating principle is based on a deep-reaching magnetic field using either permanent magnets or electromagnetic coils. An overhead suspension magnet is arranged above a feeding conveyor belt and extracts the ferromagnetic materials from the supply flow against the force of gravity. Self-cleaning magnetic separators have a circulating conveyor belt equipped with projections which removes the ferrous parts attracted by the magnets and allows them to fall into a separate container.

Overhead suspension magnets can be arranged either laterally above or even along the supply flow. Longitudinal arrangement above the container in the supply direction is advisable for the best separating result, since here the material is loosened and available in free flow. An overhead suspension magnet positioned laterally to the supply flow requires a larger magnetic force to achieve the same sorting result due to the greater distance and the material’s rest position. In this respect, the advantage of this arrangement is its lower space requirement.

Overhead suspension magnets with a manual removal device can be used where there is a low mass proportion of coarse ferrous parts. Self-cleaning overhead suspension magnets in contrast ensure efficient processes where there is an increased iron proportion in the supply flow.

Overhead and manual overhead suspension magnets are available according to size, application area and ambient conditions as a dry installation with active or passive air cooling or with active or passive oil cooling.

  • Selective separation of iron and generation of a high product purity
  • Self-cleaning of the magnets via circulating conveyor belt
  • Extraction operation
  • Grain size: 10 – 300 mm
  • Layer height up to 1 m

FinesMaster

The perfect solution for recycling fine metals, made efficient by its strong magnets and eccentric pole system.

Extra revenue for metal processors
The processing of fine-grain material has become a popular recycling business in recent years. With separate magnetic drums  and magnetic head pulleys, and the NES non-ferrous separator, STEINERT has been offering successful solutions in this field for several years.

The STEINERT FinesMaster now offers a complete system concept without the need to add any interfaces, installations or control equipment. It is STEINERT’s complete solution for increased efficiency, control and adjustment needed in the sorting of fine metals.

Benefits:

  • Compact, integrated system using proven individual components
  • Non-ferrous separator with reliable, eccentric, adjustable pole system
  • Up to 50% higher yield as other Eddy Current Separator
  • Highly concentrated metal products
  • Fast belt speed (3.2m/s; 10.5ft/sec) spreads the material and ensures increased removal of waste
  • Low metal losses
  • Multiple adjustments possible to adapt to changing material propertie

Magnetic head pulleys

High iron extraction using rotary magnetic belt separators

STEINERT rotary magnetic belt separators can be included as independent sorting units during system planning or they can be integrated as machine components into an existing conveyor belt in the form of a magnetic head pulley. This type of magnetic separator is also known as a rotary magnetic belt separator and is always used in traversing operation – for a high extraction of ferromagnetic materials. It is also possible to use stronger magnetic forces with this sorting machine to separate weakly magnetic materials like stainless steels.

The separation principle relies mainly on magnetic forces. These attract ferromagnetic materials to the pulley surface, whereas non-magnetic materials are routed to the discharge parabola depending on the conveyor belt’s transport speed. Once the materials attracted to the underside of the head pulley by the magnetic field reach the end of the magnetic force field, they obey the laws of gravity again and fall into a discharge chute partitioned via a separating splitter.

Our high-performance rotary magnetic belt separators are often used to generate stainless steel concentrate with high intrinsic value. Although typical applications also include the protection of downstream sorting steps, such as eddy-current separation, or to protect downstream crushers such as cutting mills.

The extraction of weakly magnetic particles increases efficiency and improves wear protection during subsequent separation of non-ferrous metals using eddy current separators, or provides machine protection by increasing the service life of crushing tools.

  • overfed/overflow operation
  • High extraction guaranteed
  • Magnetic head pulley available in various sizes as machine components with custom-made drive and bearing shafts.
  • Also available as a complete sorting machine

Non-ferrous or Eddy Current separators

Established, long-lasting and constantly modernised: the STEINERT non-ferrous metal separator

Optimum non-ferrous metal recoveries using eddy current separators, the inventor of the eccentrically mounted pole system

BULK .ID_Steinert_EddyCurrent_NonFerroSCheider

The recovery of non-ferrous metals is the economic basis of every recycling system. STEINERT eddy current separators with an eccentric pole system optimally meet this requirement – it is no coincidence that more than 4,000 of them are in use worldwide convincing by their high extraction volumes and durability at the same time.

Following various processing stages – like for instance disintegration crushing, classification and magnetic separation – the non-ferrous metal separator facilitates the recovery of clean, marketable non-ferrous metal mixtures containing aluminium, copper, zinc or brass. The non-ferrous metal separator can therefore be used any place where non-ferrous metals can be recovered or separated, for example when processing shredded scrap, demolition waste, municipal solid waste, packaging waste, bottom ashes from waste incineration, aluminium salt slags, e-waste, wood chips, glass or moulding sand.

A non-ferrous metal separator in its basic structure consists of a short stretch of belt that is driven at the feed end. There is a rapidly rotating permanent magnet system located in its discharge head pulley. In rotation this pole system generates high-frequency, alternating magnetic fields. This in turn causes strong eddy-currents in the conductive non-ferrous metal parts, which now for their part create their own magnetic fields opposing the outer fields. The non-ferrous parts are diverted from the remaining material stream due to the force impulse. The eccentric pole system developed by STEINERT guarantees the highest efficiency – in other words optimal sorting and long-lasting operation.

The magnetic pole system arranged eccentrically in the head pulley of STEINERT non-ferrous metal separators concentrates the effect of the magnetic alternating fields exactly in the area at which the material is experiencing the greatest force impact and is located at the discharge point from the conveyor belt. Adjustability of the pole system enables this position to be optimally configured to the current feed material, such that the discharge parabola is influenced to the greatest possible extent and the force effect is thus further intensified.
The impact of the magnetic field often starts too early in concentric pole systems, i.e. the non-ferrous particles depart too soon from the magnetic field and are therefore inadequately diverted. On the other hand, the eccentric pole system ensures that the magnetic field’s influence is only at its highest in the moment of separation and a field is not generated at other points in the belt drum. Residual ferrous metals cannot adhere to these areas of the head pulley, which reduces the wear to the belt and drum shell to an absolute minimum – this too is an essential difference to the concentric system.

The optional rotary splitter, for example, improves the extraction of long, flat materials. The different controllers also enable connection to a central plant control system as well as electric regulation of the separating splitter.

  • NES = non-ferrous metal separator
  • Eccentric pole system
  • Adapted magnetic pole systems available for various applications
  • Working widths: 500 – 2,500 mm

Magnetic drums

STEINERT MT – magnetic drums with high performance and extreme robustness

High durability and efficient sorting using STEINERT magnetic drums

The magnetic drums increase the efficiency of sorting plants by generating clean ferrous scrap. The STEINERT MT means you can reliably remove iron from various sortable materials or recover high-purity ferrous fractions. Material flows with a high iron content can thus be prepared for further differentiated sorting. Magnetic drums from STEINERT also protect crushers, mills and downstream processing equipment against wear and destruction. We therefore offer both electric and permanent magnetic drums which can be used in traversing or extracting operation. For your success, we at STEINERT also rely exclusively on proven designs which are continuously improved. Their special design ensures high purity of the sorted products and thus attractive marketing of the ferrous scrap. STEINERT magnetic drum separators are also characterised by their extreme longevity.

Magnetic drums are used wherever the belt of an overhead suspension magnet wears too quickly or where material that is difficult to collect magnetically has to be separated after the overhead suspension magnet. In most cases the STEINERT MTE electric magnetic drum is suitable for recovering metal from shredder material.

Magnetic drum separators also ensure optimal results in the processing of incineration bottom ash from incineration plants before the eddy current separator recovers valuable non-ferrous metals. The STEINERT MTP uses permanent magnetic drums to separate even weakly magnetic components from crushed battery cells or shredded electronic scrap. Ferrous impurities can also be removed from coal and glass by STEINERT magnetic drums prior to further processing.

STEINERT magnetic drums can be operated in two different arrangements: traversing and extracting operation. In the case of the classic magnetic drum that operates traversing, the bulk material is evenly distributed via a feed chute and placed onto the rotating magnetic drum. Here magnetic particles are retained on the surface of the drum and transported back, whereas non-magnetic ones follow the laws of gravity and fall down. In this case the drum always rotates in the direction of the supply flow. The material flow is easily managed in this version – not least because the grain sizes are smaller and more even.

Low output losses are achieved using a traversing arrangement. The extracting magnetic drum rotates against the supply flow and is arranged above the discharge of a feed chute. Here the magnetic drum lifts magnetic particles from the supply flow and transports them upwards against gravity by means of rotation where they are extracted beyond the drum’s splitter point. The metal product is clean and the losses are low. A change of polarity can also result in a “self-cleaning effect” whereby trapped parts like films can be released from the drum surface.

We supply the magnetic drums together with other STEINERT sorting machines also in compact form as combination separators.

  • MT(E/P) = magnetic drum (electric / permanent)
  • Separation of iron and other ferromagnetic materials
  • Excavating or traversing operation
  • Electromagnetic or permanent magnetic drums
  • Diameter: 300 – 1,800 mm, working widths: 350 – 3,400 mm