Metal Recovery Focus at CARS 18

Metal Recovery Equipment on Show at CARS Exhibition

At the CARS 2018 exhibition (11-12 July 2018, NAEC, Stoneleigh, UK), the focus on stand M6 will be on maximising the recovery of metal whilst also maintaining purity levels.

The Complete Auto Recycling Show (CARS) is Europe’s premier event for auto recyclers and material processors. It is the only event of its kind, drawing over 1,200 attendees from across the globe in 2016.

Unlike traditional trade shows, visitors get the chance to experience not only the indoor exhibitions, but to see working line demonstrations, participate in offsite tours, visit the Skills Lab and access the Conference Theatre – all included within the free ticket.

Master Magnets, the recycling focused division of Bunting Magnetics Europe Ltd, will be demonstrating the separation and recovery of non-ferrous metals and stainless steel on stand M6.

“Our focus is on recovering as much metal as possible in a high value grade,” explained Dave Hills, Bunting and Master Magnets Head of Sales.  “There is always a balance between recovery and purity and the best results often come from several stages of separation.”

Master Magnets has a complete range of metal separation equipment for every stage of metal recovery.

Ferrous Metal Separation


The primary metal separation stage in any recycling plant focused on ferrous metals.  Large Drum Magnets, specifically designed for the arduous environment, are commonly used along with smaller Drum Magnets and Pulley Magnets.

Non Ferrous Metal Recovery

Eddy Current

Eddy Current Separator designs have been perfected to enable the recovery of even the smallest non-ferrous metals.  Two rotor configurations (ie concentric or eccentric) are available to suit the specific application.  Recent developments include a precise splitter positioning system to maximise recovery and purity.

Stainless Steel Separation


Stainless Steel Magnetic Separators are a relatively new addition to the metal separation range of equipment that has been extremely popular in USA secondary metal processing plants.  There are two variations available:

HISC (High Intensity Separation Conveyor) – This enables the magnetic separation of small and mid-sized stainless steel – 10mm to 40mm (½” to 1½”) – and for wire-cleaning applications.

SSSC (Stainless Steel Separation Conveyor) – With a patent magnetic circuit design of high-intensity neodymium magnets, the SSSC can remove up to 94% of irregular shaped stainless steel – up to 125mm (5”) in size – from auto shredding or wire chopping stream.

On stand M6 at the CARS exhibition there will be demonstrations of both non-ferrous metal recovery on an Eddy Current Separator and Stainless Steel separation.

For further information on Bunting Magnetics and Master Magnets and our range of metal separation equipment designed for the metal recycling, please visit our websites or contact us on:

Phone: +44 (0) 1442 875081
Via the website

Review of the Bulk Solids and Powders Industry in Poland

Tom Higginbottom Reports Following Attending the SyMas Exhibition

Last week, our Sales Engineer Tom Higginbottom spent 2-days at the SyMas Bulk Solids and Powders exhibition in Krakow, Poland with Bunting’s local representative, TEKPRO.  Whilst at the show, he gained an insight into the present state of the market and potential opportunities for UK exporters.Bunting_at_SyMas17-17

Tom gives us his insight in the show, local feelings about BREXIT, and the market in general

“SyMas was a really good show with a busy footfall.  There was a lot of equipment on show, from manufacturers based all over the world.

From the type of enquiries and from talking to clients and our distributor, it is clear that the bulk solids and powders sector is growing.  Despite being a member of the EU, Poland remains an emerging nation and wages are still lower than in more developed European countries like the UK, Germany and France, but that gap is closing.  Their skill base is very high and consistently improving.

There is a lot of Western European investment and many of the manufacturing facilities are state-of-the-art.  This matched with the lower wage cost and workforce skills make the Poles very competitive in both European and global markets.

It was interesting speaking with the Poles about the UK leaving the European Union.  Generally, people thought that being a part of the EU makes it possible to compete with larger economies such as China and the USA.  Brexit has introduced an unknown factor and there was a feeling that, without the UK, the EU would have less negotiating power on the world stage.SyMas Tube Magnets 2

I think that the growth of our local representative TEKPRO highlights the expanding market and potential opportunities in Poland.  Since they were founded 10 years ago, they have expanded their workforce from 4 to 84 people.  It is an exciting time and we are working closely with them to maximise our sales potential in Poland.

At the show we received enquiries for both Magnetic Separator and Metal Detectors, including 3 specific projects where clients require Pneumatic Self Clean Drawer Filter Magnets and Drum Magnets.

Attending the SyMas show was really worthwhile and allowed me to gain an insight into the market which simply is not possible without being at the exhibition.


And Krakow was a beautiful city.  I have never been before and found the people wonderfully friendly and the historical buildings beautiful.”

For further information on removing metal contamination from bulk goods, powders and granules with Magnetic Separators and Metal Detectors please contact us on:

Other relevant Bulk Goods, Powders and Granules Articles


The Challenges of Removing Fine Iron from Powders

Magnetic Separators Designed for Processing Powders

Removing metal contamination when the tramp metal and material is granular is far more straightforward than when in a powder form.  To determine the best solution to remove fine iron contamination from powders, it is necessary to have a good understanding of the way the fine materials behave.

Powders are produced and used in a wide variety of industries including food, pharmaceuticals, refractories, and chemicals.  It is estimated that 80% of materials used in industry are in a powdered form.

flour-791840_960_720A ‘powder’ is defined as fine dry particles produced by the grinding, crushing, or disintegration of a solid substance.  The nature of a powder means that the handling and processing tends to be problematic as powders exhibit similar properties to both solids and liquids.

Metal contamination, commonly in an iron form, can be introduced into a material at any stage within a process.  Tramp metal that is undetected and remains in the product before the powder production stage, becomes significantly reduced in size and, subsequently, increasingly difficult to extract.

Magnetically susceptible metal contamination (i.e. iron) is commonly removed using Magnetic Separation Equipment, which traps metal using Ceramic Ferrite or Rare Earth Neodymium Iron Boron (Neodymium) Magnets.  Although there are Magnetic Separators where the magnetic field is produced via an electrical current, the vast majority utilize permanent magnets such as Ceramic Ferrite and Rare Earth Neodymium Iron Boron (Neodymium).  Ceramic Ferrite Magnets produce low strength but deep magnetic fields, while Neodymium Magnets create the strongest permanent magnetic presently commercially available.

Where Does The Metal Originate?

Metal contamination commonly originates in a powder from two sources:

  1. Primary large tramp metal, such as a nail, screw or bolt;Tube Cartridge Magnets Bunting Magnetics-5
  2. Primary or Secondary fine tramp iron. Primary fine iron or magnetic particles are often present in the raw material.  This originates from primary processing, transportation, or even naturally occurs in the original material.  Secondary fine iron originates from a larger tramp metal source that has been reduced in size during the process.  Typically, this could be from a nail, screw or bolt that has been through a size reduction process, or from damaged or worn processing equipment.  Another common source of secondary fine iron contamination is rust, falling into the process from weathered and worn processing equipment such as chains, hoists, and building cladding.

The separation and detection of tramp metal is easier when the metal contamination is in a larger form and can be successfully removed using a wide range of suitable Magnetic Separators and Metal Detectors.  Magnetic Separators using standard strength Ceramic magnets, with deep magnetic fields, are ideal.  A good example is the Plate Magnet, often installed in a chute, in a housing, or as part of an In-Line Magnetic Separator.

Quicktron05A_Sodium Bicarbonate 2

Larger metal contamination is also easier to detect on a Metal Detector.  Metal is detected as it passes through the coil of the Metal Detector and an automatic reject system removes it from the flow.  For detection, the magnetic field generated by the Metal Detector has to see a state change.  Finer sized metal produces a lesser state change and thus increases the difficulty in detection.

In a project in Pakistan, a processor of fine Sodium Bicarbonate is using a Quicktron Metal Detector to remove the larger tramp metal.

Removing larger tramp metal with a Magnetic Separator and Metal Detector prior to the processing stage not only prevents the metal from being reduced in size (e.g. converted into a secondary source of fine iron contamination), but also protects delicate processing equipment such as granulators, shredders, and mills from being damaged by the metal.

Once in a powder form, there are processing parameters to consider when assessing the optimum method to remove fine iron contamination.

How Does a Powder Flow?

When a powder is sprinkled, it remains light and free.  However, when the same powder is vibrated or compressed, it may become very dense and even lose the ability to flow.

Individual grains in a powder cling to each other in clumps, in accordance with the Van der Waals force.  This coagulation often results in the fine iron being trapped in among clean product.  The ability of any Magnetic Separator to attract, hold and separate the fine iron is dependent on the iron being as close to the magnetic field as is physically possible.  If the fine iron contacts the surface of a Magnetic Separator with a high strength magnetic field, it will be held.  However, when the fine iron is held inside a coagulation of powder, then it could be held out of the reach of the maximum magnetic force.  Thus, it will not be separated.

The way a powder flows impacts on the design of the Magnetic Separator.  Powders flowing in a hopper may experience classic flow problems such as ratholing, bridging or flooding, all of which could be exacerbated by the design of Magnetic Separator.

Different Designs of Magnetic Separator

Plate Magnets Bunting Magnetics-9797High strength magnetic fields, as produced by Neodymium, are needed to capture fine iron metal contamination.  There are four main magnet configurations suitable for handling powders.

  1. Tube Magnets (also known as Rod Magnets and Cartridge Magnets), often in a multi-rod Grate configuration;
  2. Flat-faced Magnetic Plates;
  3. Cone-shaped Magnets;
  4. Magnetic Drums with a curved magnetic arc;

Although occasionally a Tube Magnet may be used on its own, it is more commonly part of a larger multi-cartridge Grate system.  The Magnetic Grate is designed to fit inside a hopper, or can be supplied complete with a housing (i.e. as a Drawer Filter Magnet).ff-neo-4

In operation, powder falls freely onto the surface of the Tube Magnet where fine iron strikes the surface and is held by the strong magnetic field.  To ensure that the powder makes contact with the Cartridge surface, deflectors are often deployed above the gaps between the Cartridges.

Powder build-up on the surface of a Magnetic Cartridge will reduce the separation efficiency.  Also, in severe cases, a slight build up on the surface of the Cartridge may quickly cause a blockage of the whole housing.

Such blockages can be prevented by ensuring that there is optimum space between the Magnetic Cartridges.  Also, in some cases, the mounting of an external vibrating motor on the side of the hopper or housing will provide enough disturbance to prevent any material coagulation.  The frequency of the vibration needs careful consideration as it could affect the flow ability of the powder.  Additionally, when vibrators are used, the Magnetic Cartridges need to be manufactured to withstand prolonged periods of vibration.

Bunting Teardrop Tube Magnet

‘Teardrop’ shaped Tube Magnets are specifically designed to stop the build-up of fine powder on the surface.  The sharp edge of the teardrop faces up into the product flow and allows material to flow around the edge and into the magnetic field.  Magnetic particles are captured and held underneath the Tube Magnet.

Flat-faced Magnetic Plates are ideal when it is possible for the material to flow over the surface.  For fine iron removal, the Magnetic Plates would use high strength Neodymium Magnets.  This magnetic field is further enhanced when a Tapered Step is added to the face of the magnet.  Captured iron migrates behind the step and away from the material flow, reducing the risk of re-entering the cleansed product.

As well as being fitted into chutes, Magnetic Plates are incorporated into housings.  The Plate Housing Magnets resist bridging and choking to remove tramp iron and ferrous fines from flow-resistant bulk materials.  The stainless steel housings mount easily to enclosed spouting or directly on processing equipment.

There are optional square, rectangular, and round adapters for easy connection to existing chute work.  A baffle at the top of the housing helps break up clumps and directs product flow over the unit’s two powerful Plate Magnets.

Bunting Magnetics In Line Magnet

Plate Magnets are also used in In-Line Magnets and there are two designs:

  1. Gravity In-Line Magnets (GIM) – The Plate Magnets are positioned in round, sloping spouting where material is under gravity flow.  For effective tramp metal capture, the spouting should be angled no more than 60° from horizontal;
  2. Pneumatic In-Line Magnets (PIM) – These designs are for use in dilute phase pneumatic conveying systems (up to 15psi). They can be installed easily with optional factory-supplied compression couplings and work best in horizontal runs with the plate magnet down to take advantage of material stratification;

Another design of In-Line Magnet is the Center-Flow, although the magnetic field is generated in a Cone configuration instead of a Plate.  The Magnetic Cone is positioned in the center of the housing, allowing the powder to flow in the space left between the housing.  Center-Flow In-Line Magnetic Separators are commonly used in dilute-phase pneumatic conveying lines up to 15psi.

To achieve optimum contact with the product flow, a conical magnet is suspended in the center-line of the housing.  This tapered, exposed-pole cartridge has a stainless steel “nose cone” to direct the flow of materials around the magnet.  The tapered poles of the cone magnet allow ferrous fines to collect out of the direct air stream.  Additionally, the trailing end of the magnet is an active magnetic pole and holds any tramp metal that is swept down the cone.

Both types of In-Line Magnet are designed with clamps and doors to enable easy access for cleaning.

drumIn specific applications, a high strength Neodymium Drum Magnet will enable the best level of separation.  The Drum Magnet is gravity-fed, usually via a Vibratory Feeder.  The Drum Magnet has a stationary high-strength magnetic arc positioned inside a rotating outer shell.  When material flows onto the drum magnet, the magnetic field projected by the stationary magnetic assembly inside the shell captures fine iron and holds it securely to the drum’s stainless steel surface.  With contaminants removed, the good product falls freely to a discharge point.  As the drum rotates, the captured fine iron travels along the drum surface and out of the magnetic field, where it is discharged.

There are various magnetic field configurations possible, but the most suitable for removing iron from powder is one that produces a Radial Magnetic Field.  This ensures that once captured, the fine iron does not leave the Drum surface until it moves out of the magnetic field.

Processing powder on a Drum Magnet presents more difficulties that other designs of Magnetic Separators.  Firstly, it is recommended that the Vibratory Feeder has an air bed to produce a consistent feed of powder.  Standard Vibratory Feeders may deliver powder in clumps, significantly affecting the separation performance.

Secondly, the shell of the Drum Magnet should be rotated at high speeds.  This will result in some of the powder pluming, and this can be minimized by keeping the distance between the end of the Vibratory Feeder Tray and the rotating surface of the Drum Magnet to a minimum.

The high rotation speed of the Drum Magnet significantly reduces the amount of product lost to the magnetics.  This is because there is less material on the surface of the Drum at any one time, reducing the chance of entrapment.

The use of Drum Magnets operating at high rotational speeds has been very successful in removing fine iron from abrasives, refractories, and other applications where the material has a high specific gravity.

Ensuring Powder is Metal-Free

As the demand for finer and purer powders increases, so does the need to remove even the finest iron.  Understanding the properties and behavior of the powder is vitally important when considering the optimum method of fine iron separation.  Often the ultimate solution is a series of Magnetic Separators and Metal Detectors located at strategic points within the process.

For further information on removing fine metal contamination from powders with Magnetic Separators and Metal Detectors please contact us on:

BCMY Ltd Recycle Laser and Toner Printer Cartridges Using a Bunting Drum Magnet

Successful Metal Separation from Waste

Extending BCMY’s ability to efficiently and effectively manage old laser and toner cartridges was the primary objective behind the development of a new recycling line and the installation of a Bunting Drum Magnet.

Bunting BCMY-7460

BCMY Ltd, based in Lancing in West Sussex, is one of the UK’s premier processors of used printer cartridges and receives materials from across the UK and Europe.  With over 12 years’ experience in handling secondary ink and toner cartridges, growth of 25-30% per annum over a 5 year period resulted in moving to new premises in 2010, since when BCMY has continued to expand.

At present, only around 15% of the 250m ink and 25% of the 40m toner cartridges used in the West-Europe are recycled, with the majority ending up in landfill, where it can take more than 1,000 years to decompose whilst being a threat to ground water pollution.  In addition, they are classed as a hazardous material, due to the chance of explosion from the small particle size of the toner dust, and any post-consumer processing needs to be expertly managed.

On receipt of the used laser & toner cartridges, BCMY makes a decision on whether the item can be reused or if it needs to be recycled.  At present, approximately 62% of all cartridges received by BCMY are reused and saved from entering the internal waste stream, although the growing number of poorer quality replicas and compatibles (15%) originating from the Far East and a growth in remanufactured cartridges (20%) means that an ever increasing number need to be considered for internal recycling.

There remains a high global demand for specific virgin empty cartridges despite increased competition from the Far East.  However the overall percentage of cartridges collected, that can be reused, is falling.  The disposal options for high volume cartridges producers are becoming more limited with the introduction of tighter waste legislation and a reduction in industry capacity to deal with the non reusable cartridges. With Landfill no longer a legal option for high volume producers – waste to energy plants, due to the cartridges high calorific value, is now the favoured route of disposal. However, this raises a number of other environmental issues.

BCMY made a decision to extend their business services by specifically enabling the physical recycling of the non-reusable cartridges.  A prototype facility was designed and built by the BCMY team using their extensive knowledge of the used cartridge industry.  At present, with capacity of approximately 2000 units per day, they manually remove the hazardous toner dust and are then left with a co-mingled case made of mixed rigid plastic and metal.  The empty cartridge shells are fed into a slow speed shredder for size reduction and liberation and then up an incline conveyor before passing over a strong Drum Magnet supplied by Bunting.  The Drum Magnet separates all magnetic materials, such as steel components, springs and other small ferrous metals and ceramic magnets, from the non-magnetic plastic.  Post this primary separation stage, the plastic fraction is further shredded for additional liberation before being passed over an Eddy Current Separator to recover non-ferrous metals such as aluminium.

Bunting BCMY-7461

The high strength model DSH-1212-NPD Bunting Drum Magnet is 300mm (12”) diameter by 300mm (12”) width and was supplied complete in a housing with a direct shaft-mounted drive.  Material is conveyed up to the hopper by the incline conveyor and then cascades down onto the surface of the Drum Magnet, where the strong magnetic field attracts and holds magnetic materials, carrying them underneath and then out of the field so that they drop into a separate container.  The plastic non-magnetic material is unaffected and follows its normal trajectory into a separate collection bin. The magnetic field is produced using permanent Rare Earth magnets, producing a deep and very strong magnetic field ideal for the application.

There is approximately a 42% metal content in each cartridge, which is then sold as an end product. The recovered plastic which is made up of (PS,ABS,PET,PP,POM, and HDPE) is also resold for a wide variety of applications including the production of plastic wood .The hazardous toner powder is used as a colorant in the manufacture of plastic, in tarmac and in marine paint for boats.

When assessing the equipment they needed for the recycling plant, Simon Gilchrist, Managing Director of BCMY, undertook a great deal of research before making the decision to purchase the Drum Magnet from Bunting.

Simon commented, “Bunting was a local company and we were able to visit their facility to witness testing on our material.  We really appreciated Carlton’s advice [Carlton Hicks, Sales Manager] and the testing meant that the separation Bunting claimed was possible was 100% proven and we could purchase with confidence.  We wanted to work with a UK manufacturer so that the equipment would be UK built and not purchase through reseller of an importer.  The installation has been very successful and we have further plans to expand the facility.”

For more information on Magnetic Separators used to recover metals in the recycling sector or the application mentioned in this case history please visit the Bunting stand 5R81 at RWM16 or contact the Bunting sales team on:

Phone: 01442875081


Via the website

Bunting BCMY-7467



What is an Axial and Radial Magnetic Field?

Explaining Magnetic Separation

Rotary Magnetic Separators, such as the Bunting Drum Magnet and Magnetic Separation Pulley, are designed with a specific type of magnetic field.  The type of magnetic field has to be considered when looking at any application and when deciding which design will achieve a customer’s separation objective.

So what is an Axial or Radial Magnetic Field and why is it so important?

Axial Magnetic Field

Axial Magnetic Field Bunting Magnetics- Figure 1 – Axial Magnetic Field

This is when the magnetic field stretches across the width of the rotary Magnetic Separator.  Magnetically susceptible material entering into the field is attracted to the point of highest magnetic intensity (the pole) but is then dragged through an area of weaker field (between the poles) and onto another pole by the motion of the conveyor or drum.

This type of magnetic field is ideal when there could be a high level of entrapped non-magnetic material captured by the Magnetic Separator.  The motion of moving between the poles results in non-magnetic material being released as the magnetic item ‘tumbles’ in the field.  However, with this type of magnetic field there can be a reduced separation performance.

Radial Magnetic Field

Radial Magnetic Field Bunting MagneticsFigure 2 – Radial Magnetic Field

The Radial Magnetic Field has poles running in the same direction as the rotation of the conveyor or drum and with the flow of the material.  Magnetically susceptible material is attracted to the points of highest magnetic intensity (the poles) and held until it is dragged out of the magnetic field underneath the conveyor or Drum.

This type of magnetic field is ideal when the maximum level of separation is required, but there can be some carryover of non-magnetic material.  The fact that the captured magnetics always remain on the pole of highest magnetic intensity means that they are far more likely to be removed and, therefore, the radial design provides the best level of separation.

These types of Magnetic Fields are used in Magnetic Separators such as Magnetic Drums and Magnetic Pulleys.

For further details on the Bunting range of Metal Separation Equipment, please contact our technical sales team on:


Misconception of Ferrous Metal Removal before an Eddy Current Separator

4th of 5 Misconceptions About Eddy Current Separation

This is the 4th in a short series of blogs discussing misconceptions about Eddy Current Separation.  Eddy Current Separators are used extensively throughout the recycling industry to separate non-ferrous metal (e.g. aluminium beverage cans, shredded aluminium and copper etc) from non-metallic materials.

Bunting Eddy Current Separator-5

All Ferrous Metal Need to be Removed

Despite the Eddy Current Separator being a separation system based on magnetic principles, there is often a question about whether it should be used to also remove ferrous metals.

In its simplest form, the Eddy Current Separator is a conveyor with a magnetic rotor acting as a magnetic head pulley.  Due to the laws of physics, the Magnetic Rotor will attract ferrous metal and so could be used to separate magnetically susceptible materials.  However, there are some limitations:

  1. With Eddy Current Separators that have Concentric Magnetic Rotors (ie the magnetic rotor spins uniformly within an outer non-magnetic shell), it can be difficult to discharge magnetic material from the belt. Due to the high speed rotating magnetic field, magnetic material that has not been discharged and remains vibrating at the bottom of the rotor can get hot and, when the conveyor belt stops, can burn through the plastic of the belt.  This can then damage the shell and the magnetic rotor;
  2. The Eccentric Magnetic Rotor design is more forgiving as the rotor sits in a corner quadrant of the non-metallic shell and so magnetic material leaves the magnetic field as it is pulley around by the conveyor. This ferrous metal is discharged underneath and often into the non-metallic fraction;

Successful metal recovery and separation is achieved by focusing on specific materials at key points in the process and this means removing as much ferrous metal prior to the Eddy Current Separator as possible.  This then leaves the Eddy Current to focus on separating non-ferrous metals from non-metallic materials.

Typically ferrous metals are removed and recovered prior to the Eddy Current Separators with:

Other blogs in this series on Misconceptions about Eddy Current Separation include:

For further details on the Bunting range of Eddy Current Separators, Magnetic Separators and Metal Detectors please contact Carlton Hicks ( or our technical sales team on:

Getting Metal Out of Recycled Tyres and Rubber

A Guide to the Ideal Location for Magnetic Separators and Metal Detectors in a Tyre and Rubber Recycling Plant

Successfully removing the metal banding from rubber when recycling tyres is critical as rogue metal can cause injury to horses and children who run and play on the rubber crumb.  Although each tyre recycling plant is different, here is a guide to the types and location of Magnetic Separators to remove the steel.

The biggest challenge with removing all the steel wire from shredded tyres is to maximise separation whilst minimising product (rubber) loss.  This means that multi-stage Magnetic Separation is required.


As shown in the typical plant layout, the primary objective is to liberate the rubber from the metal and this is commonly achieved with a 2-stage shredding set-up.  This achieves optimum size reduction whilst also producing a rubber crumb material that is well liberated.  After the 2nd stage of shredding, it is then possible to focus on the separation of the steel.

Step 1 – Primary Magnetic Separation after the 2nd Shredder

At this stage, the objective is to separate the bulk of metal and this is achieved using a high strength Twin Pole Overband CBS Magnet.  The Twin Pole Overband produces a deeper and stronger Magnetic Field to lift and separate small wires and wire still entrapped in rubber (as explained in the blog The Benefits of a Twin Pole Overband Magnet);

Bunting Overband Single and Twin Pole Magnetic Field

Step 2 – Magnetic Separator Treatment of the Separated Metal Fraction

As there will be clean rubber product carried over into the separated metal fraction, the material can be passed over a Magnetic Drum Separator or Magnetic Pulley or the High Intensity Separation Conveyor (also known as the Stainless Steel Separator), all using high strength Rare Earth Magnets.  It is important that either of these has an Axial magnetic field (one that runs along the length of the Magnetic Separator) as this causes the material to tumble and release entrapped rubber.  If a Magnetic Drum is uses, then consideration is needed for either a manganese steel shell or wear cover as the strong magnetic characteristics of the steel wear can result in heavy wear;

Step 3 – Secondary Magnetic Separation

A second stage Magnetic Separation treatment of the primary rubber product prior to storage is recommended to remove any stubborn metal left after the first stage separation.  This is achieved using a second Twin Pole Overband CBS Magnet;

Step 4 – Magnetic Treatment of the Rubber Powder

For fine rubber material, that is fed onto a powder grinder, a final stage Magnetic Separator is needed to remove small fragments of wire.  As the volume of metal is low, a Plate Magnet suspended close to the product over the conveyor will lift and remove the fine wires;

Plate Magnets Bunting Magnetics

The 4 steps outlined are generalisations in line with work Bunting has conducted with tyre recyclers around the world, but each plant is often unique.  When considering metal separation, either from the start or to improve on the level of metal separation presently being achieved, a review of the plant by one of the Bunting or Master Masters Application Engineers will enable the recommendation of the optimum design and location of a Magnetic Separator.

For further information on removing Metal from Recycled Tyres using Magnetic Separators, please contact the Bunting technical sales team on:

Phone: +44 (0) 1442 875081
Fax: +44 (0) 1442 875009

Metal Separation from Rubber Crumb

Explaining Magnetic Separation through Video

Demonstrating Metal Separation

Explaining the concept of Magnetic Separation through words alone can often be challenging.  The basic physics are simple.  A magnetic field attracts magnetically susceptible particles.  This then enables them to be separated from materials unaffected by a magnetic forces.

This magnetic separation technology in applied in industries as diverse as recycling to the production of baby food.  There is a wide range of different designs, types and strengths of Magnetic Separator.

To help explain and demonstrate Magnetic Separation, we are continually adding to our video collection on YouTube.

Our videos demonstrate a wide range of Magnetic Separation equipment and Factory Magnet Solutions including:

Magnetic Separators

  • Magnetic Drum Separator
  • Eddy Current Separator, including a Metal Separation Module installed in a UK plastic recycling operation
  • What can your magnet pick up?
  • Stainless Steel Separation with the HISC
  • Magnetic Separation demonstrations at exhibitions
  • Plate Magnets
  • Tube Magnets

Factory Magnet Solutions

  • Magnetic Sweepers
  • Sheet Fanners

Company Videos

  • An Introduction to Bunting Magnetics
  • Bunting’s Customer Service

Manufacturing in Action

  • Welding in 6 seconds
  • Laser cutter in 6 seconds

Additional product and application details on all the Magnetic Separators and Factory Magnet Solutions can be found on our website.


For more information please contact our team on:

Phone:  01442 875081


Via the website