Magnetic Separator for Material Recovery
A magnetic separator removes ferrous metal from plastic flakes, mixed waste, mining material, and other bulk streams before the metal damages crushers, granulators, extruders, or final sorting equipment.
- Captures tramp iron, steel pieces, screws, nails, wire, and other magnetic contamination from moving material streams.
- Protects downstream equipment while improving the purity and resale value of recovered material.
- Available as overband magnets, drum magnets, magnetic pulleys, and line-specific separation modules.
How a Magnetic Separator Works
A magnetic separator places a controlled magnetic field near the material flow. Ferrous metal responds to the magnetic force and separates from plastic, paper, glass, wood, minerals, or other non-magnetic material.
1. Material Feed
Material moves across a conveyor, chute, drum surface, or pulley. A consistent layer improves separation because the magnet can reach each particle more evenly.
2. Magnetic Capture
Iron and steel are attracted by the magnetic field while non-magnetic material continues along its normal path.
3. Separate Discharge
Captured metal is discharged into a separate collection point, reducing contamination and protecting downstream machines.
Types of Magnetic Separators
The right magnetic separator depends on where the metal appears, how deep the material layer is, and whether you need manual or continuous discharge.
Overband Magnetic Separator
Installed above a conveyor belt.
Suitable for removing large ferrous contaminants from plastics, waste streams, wood, and aggregate before crushing or sorting.
Drum Magnet
Magnetic drum with continuous discharge.
Useful when material passes directly over the drum and the line needs automatic separation of ferrous pieces from dry bulk material.
Magnetic Pulley
Installed as the conveyor head pulley.
A compact choice for continuous ferrous separation at the end of a conveyor without adding a large overhead unit.
Eddy Current Separator
For non-ferrous metals.
Used after ferrous removal when the line also needs to recover aluminum, copper, brass, and other conductive non-ferrous metals.
Key Applications
Magnetic separation supports both equipment protection and product purity in recycling and industrial material handling.
Plastic Recycling
Removes screws, staples, wire, steel fragments, and tramp iron from PET, HDPE, PP, PE film, and rigid plastic recycling lines.
Waste Sorting
Recovers ferrous metal from municipal solid waste, RDF/SRF preparation, and mixed material recovery facilities.
Mining & Quarrying
Separates iron-bearing material and protects crushers, screens, and conveyors from unwanted metal contamination.
Manufacturing
Keeps grinders, mills, and production lines running by pulling metal out of raw material before it reaches the machinery.
Selection & Operating Factors
Good separation depends on more than magnet strength. The material flow and installation position matter just as much.
What to Check Before Selection
- Material type, bulk density, particle size, and moisture level.
- Expected ferrous contamination size, shape, and loading rate.
- Conveyor width, belt speed, burden depth, and installation height.
- Whether the plant needs manual cleaning, automatic discharge, or continuous operation.
Why It Matters
In plastic recycling, a small steel fragment can damage crusher knives, screens, pelletizer components, or extruder screws. A properly placed magnetic separator reduces this risk before the metal reaches expensive downstream equipment.
For higher purity targets, magnetic separation is often used before density separation, air classification, optical sorting, or pelletizing.
Typical Technical Parameters
Final specifications depend on the separator type and the recycling line layout. These parameters are common discussion points during equipment selection.
| Parameter | Typical Options | Selection Notes |
|---|---|---|
| Separator Type | Overband, drum, pulley, eddy current | Match the type to material flow, metal type, and discharge requirement. |
| Conveyor Width | Customized to line width | The magnetic zone should cover the full material stream. |
| Material Layer Depth | Low and evenly spread is preferred | Deep burden reduces capture performance, especially for small metal pieces. |
| Cleaning Method | Manual or automatic discharge | Automatic discharge is preferred for continuous and high-contamination lines. |
| Installation Position | Above conveyor, at discharge, or head pulley | Place the separator before sensitive machinery whenever possible. |
Related Equipment
Build a cleaner recovery line by pairing magnetic separation with the right downstream sorting and recycling equipment.
Frequently Asked Questions
Install it before crushers, granulators, extruders, pelletizers, or fine sorting equipment whenever ferrous metal could damage downstream machinery.
No. Standard magnetic separators remove ferrous metals such as iron and steel. Aluminum, copper, and brass usually require an eddy current separator.
Overband magnets are common above conveyors. Drum magnets and magnetic pulleys are useful when the layout needs compact, continuous ferrous discharge.
Magnet strength, belt speed, burden depth, material distribution, installation height, and particle size all affect capture performance.
It depends on the grade. Magnetic ferritic and martensitic (400-series) stainless responds to the field, but non-magnetic austenitic (300-series) stainless is largely invisible to a standard magnetic separator and needs eddy current or sensor-based sorting.
Magnetic force drops sharply with distance, so the separator must sit close enough for its field to reach the bottom of the material layer. A deep or uneven burden, or a magnet mounted too high, lets small ferrous pieces slip through. A shallow, evenly spread stream at the correct gap gives the most reliable capture.
Request a Magnetic Separation Recommendation
Share your material, conveyor width, throughput, and contamination details. Our engineers can recommend a suitable magnetic separator configuration.
