Permanent magnetic roller for dry separation, used with belt conveyors. Widely used for dry waste rock removal and ore sorting in magnetite mines, iron removal in grain processing and cement/building materials, and metal recovery in metallurgy. High magnetic field, low cost, long life, easy installation and operation with obvious benefits.
The Dry Magnetic Roller is a permanent magnetic roller-type dry magnetic separator, typically installed as the head pulley (drive pulley) of a belt conveyor. Using the strong magnetic field generated by built-in high-performance permanent magnets, when material is conveyed by belt to the roller and discharged, magnetic material is adsorbed on the belt surface and continues with the roller into the concentrate hopper, while non-magnetic material is discharged normally at the roller end. 5 models cover roller diameters of φ320-630mm, belt widthsCompatible B500/B650, capacity 20-80 t/h, processing size 10-50mm, suitable for dry pre-selection waste removal of lump magnetite and iron removal from non-magnetic materials.
Material (ore/grain/building materials) is evenly spread on the belt by the belt conveyor and conveyed forward. The dry magnetic roller is installed at the head of the belt conveyor, replacing the ordinary head pulley, driving the belt operation.
When material reaches the magnetic roller head, it begins to be discharged. Magnetic ore particles are attracted by the strong magnetic field force from the permanent magnet system inside the roller, adsorbed on the belt surface, and continue moving downward with the roller rotation rather than being thrown off by inertia.
Magnetic material is carried by the belt to the bottom of the roller where the magnetic field weakens, naturally falling off into the concentrate hopper. Non-magnetic material is normally thrown off at the roller top into the tailings hopper, completing dry magnetic separation — no washing water, no additional power (using the existing belt conveyor drive).
| Model | Type | Specs (mm) | Feed Size (mm) | Capacity (t/h) | Weight (kg) | Dimensions (mm) |
|---|---|---|---|---|---|---|
| B500×Ø320 | Permanent Magnetic Roller Type | Ø320 × 500 | 10-50 | 20 | 100 | 890 × 320 × 320 |
| B500×Ø400 | Permanent Magnetic Roller Type | Ø400 × 610 | 10-50 | 30 | 150 | 990 × 400 × 400 |
| B500×Ø500 | Permanent Magnetic Roller Type | Ø500 × 850 | 10-50 | 40 | 200 | 1050 × 500 × 500 |
| B650×Ø500 | Permanent Magnetic Roller Type | Ø500 × 760 | 10-50 | 50 | 250 | 1170 × 500 × 500 |
| B650×Ø630 | Permanent Magnetic Roller Type | Ø630 × 760 | 10-50 | 60-80 | 300 | 1170 × 630 × 630 |
※ Custom roller lengths available for belt widths B500/B650/B800/B1000. Specifications subject to change without notice.
| Component | Function | Material / Features |
|---|---|---|
| Permanent Magnet Core (Magnetic System) | Fixed on the center shaft inside the roller, does not rotate. Generates a fan-shaped strong magnetic field covering about 180° of the roller surface. Magnetic poles alternate along the circumference, forming dense magnetic field lines to capture magnetic material passing on the belt | NdFeB rare earth permanent magnet + ferrite composite |
| Stainless Steel Roller Shell | Cylindrical shell surrounding the magnetic system, rotating with the belt. Serves as the belt conveyor head pulley driving belt operation, while its non-magneticFeatures allows internal magnetic field lines to penetrate the shell and act on the material | Non-magnetic stainless steel (304/316L) |
| Center Shaft & Bearing Housings | Magnetic system main shaft is fixed and does not rotate, mounted on the belt conveyor frame through bearing housings at both ends. The roller freely rotates on the center shaft via bearings | 45# steel shaft + heavy-duty spherical bearing |
| End Covers & Seals | End covers at both ends welded and sealed to the shell, with labyrinth orFrame oil seals to prevent dust and moisture fromIntrusion the magnet core cavity | Cast steel end cover + NBR rubber seals |
| Pulley Connection Flange | Connection structure at both ends of the roller forReceive power transmitted from the belt conveyor motor, driving the roller and beltCirculation motion | Cast steel / welded flange |
Rare earth NdFeB permanent magnet composite system, with peak magnetic flux density on the roller surface reaching over 6000 GS. Large magnetic field penetration depth, effectivelyAdsorption 10-50mm lump magnetite ore, with dry separation waste rejection rate reaching 15%-30%.
Directly replaces the existing belt conveyor head pulley, using the original conveyor motor drive without adding any power consumption. Installation only requires 2-4 hours of downtime, no civil works or piping modifications needed.
Pure dry magnetic separation, no water consumption, no chemical additives, no tailings pond required. Especially suitable for pre-selection in magnetite mines in arid, water-scarce regions, significantly reducing subsequent grinding and wet separation costs.
Not only for mine waste removal and ore sorting, but also as in-line iron removal equipment for grain processing (removing nails and iron filings), cement and building materials (raw material iron removal), and metallurgical recovery (steel slag iron recovery).
Permanent magnet system does not demagnetize, with a design magnetic life of over 10 years. Fully sealed structure is dust-proof and waterproof; stainless steel roller is corrosion-resistant and wear-resistant. Daily maintenance only requires regularInspect of bearing lubrication and seal condition.
The equipment price is far lower than large wet magnetic separators. Installed as pre-selection equipment after coarse or medium crushing, it can reject 15-30% of waste rock in advance, reducing subsequent grinding volume, with significant comprehensive energy-saving benefits.
Installed after coarse or medium crushing of magnetite and before grinding, the dry magnetic roller is configured as the belt head pulley toAdvance reject mixed-in surrounding rock and waste (10-50mm), reducing grinding feed by 15%-30%, significantlyReduce grinding energy and steel consumption.
Installed on the conveyor belt for cement raw materials (limestone, clay, iron powder), the dry magnetic roller removes harmful iron debris such as iron blocks, shovel teeth, and bolts online, protecting downstream crushers, vertical mills, and other equipment from iron damage.
Soybeans, corn, wheat, and other grains pass through the belt conveyor with magnetic roller before processing to remove metal foreign objects such as iron nails and wire mixed in during harvesting and transport, ensuring food processing safety and grinding equipment operation safety.
Iron and steel particles in steel slag, smelting slag, and foundry waste sand can be recovered dry through the dry magnetic roller. Ferrous metals in crushed waste home appliance materials can also be sorted by the magnetic roller, achieving resource reuse.
Interested in Dry Magnetic Roller? Contact us for dry pre-selection or industrial iron removal solutions