Construction and working
A magnetic roll separator has two rolls with a thin conveyor belt running between them. One of them is the magnetic roll. A vibratory feeder spreads material evenly onto the belt, and the belt carries it into the magnetic field at the head roll. Non-magnetic particles follow their natural trajectory and fall forward. Magnetic and paramagnetic particles are held to the belt a little longer and drop behind an adjustable splitter.
The roll is built from rare-earth magnet alloys arranged to create a very high field strength and gradient at the roll surface. A motor drives the belt through one roll, and roll speed can be adjusted to suit particle size and magnetic susceptibility. Belt material and thickness are selected for the mineral being processed.
Where roll separators earn their place
Roll separators are the go-to choice where ordinary ferrite magnets cannot pull weakly magnetic minerals. Typical examples are removing iron-bearing minerals from feldspar or silica, cleaning bauxite, and upgrading abrasive and refractory raw materials. Multi-roll stacks are available for higher purity.
Key features of our magnetic roller separator
- Rare-earth magnetic roll with high field gradient
- Variable roll speed
- Adjustable splitter for clean cut points
- Compact footprint
- Low energy consumption
- Easy belt access for changeover
- Single or multi-roll stages
- Long functional life
Applications & industries
- Abrasive & refractory materials
- Magnetite beneficiation
- Bauxite cleaning & upgrading
- Feldspar cleaning
- Iron ore beneficiation
- Diamond beneficiation
- Quartz & silica sand
- Ceramic raw materials
Magnetic Roller Separator at a glance
| Magnet | Rare-earth (NdFeB) magnetic roll |
|---|---|
| Feed | Vibratory feeder, controlled rate |
| Belt | Selected material and thickness per mineral |
| Drive | Motorised, adjustable speed |
| Stages | Single, double or multi-roll |
Exact dimensions, capacity and magnet strength are confirmed against your application before manufacture.
Need a magnetic roller separator for your plant?
Send your material, capacity and installation details for a quotation.
Frequently asked questions
What is a magna roll?
"Magna roll" is a common name for a rare-earth magnetic roll. It is the high-intensity roll at the heart of a magnetic roller separator.
Can a roller separator remove paramagnetic minerals?
Yes. That is its main purpose. The high gradient at the roll surface attracts weakly magnetic particles that a standard ferrite magnet would miss.
Is the feed required to be dry?
Yes. Roll separators work on dry, free-flowing feed. For slurries we recommend wet drum or wet high-intensity separators.
