What this equipment does
Magnetic separators serve two distinct roles in coal handling and preparation: tramp iron removal on incoming feed streams (overband magnets and pulley magnets on conveyors), and magnetite recovery in dense-medium washing circuits (wet drum magnetic separators on dilute medium streams). The principles are similar, but tramp-metal devices are typically permanent or electromagnetic suspended units, while medium recovery uses wet rotary drums in a specific magnetic intensity range.
At a Glance
- Equipment Type
- Magnetic separator
- Material Handled
- Coal and tramp metal; dense medium with magnetite
- Capacity Range
- 5–500 tph
Common Applications
- Tramp iron removal on conveyors
- Magnetite recovery in dense-medium circuits
- Protection of downstream crushers and pulverizers
Technical Specifications
| Specification | Value | Unit |
|---|---|---|
| Magnet Types | Permanent, electromagnetic | |
| Configurations | Suspended overband, pulley, wet drum | |
| Capacity | 5–500 | tph |
| Belt Width Range | 500–2,200 | mm |
| Wet Drum Diameter | 900–1,500 | mm |
Selection Factors
- Tramp metal size and quantity expected
- Belt width, belt thickness, and burden depth
- Permanent vs electromagnetic
- Wet drum: required magnetite recovery efficiency
- Bypass and self-cleaning provisions
Maintenance and Wear Notes
Suspended magnets require periodic inspection of the self-cleaning belt (if equipped) and the support structure. Wet drum separators require monitoring of the wear belt over the drum and inspection of the magnet assembly seals.