Magnetic drum

Ferrous contaminants are separated and discharged continuously, with no manual cleaning and no need to stop production. That is the difference from a grid or a plate, where an operator has to remove the captured metal at intervals. On the drum you only plan where the discharged metal falls and how often the container under it is emptied.

Dry powders, granulates, shredded materials, magnetic ores, aggregates and wet slurries. That breadth is why drums appear on recycling and mineral processing lines, where the fraction is uneven and the flow is continuous. Both dry and wet mixtures are within scope, which is not the case for static grid designs.

It states the drum dimensions and the working width in millimetres. The range includes MB 204x340/300, MB 204x500/440, MBZ 204x340/300 and MBZ 204x500/400. The working width has to cover the material stream at the discharge point, since anything travelling outside that width passes the drum untreated.

They identify the magnet system: F for ferrite, N for neodymium and F+N for a combined design. Ferrite reaches deeper into a thick material layer, neodymium pulls harder on fine particles nearer the surface, and a combined system targets both. Large pieces in a deep layer favour ferrite, fine iron dust favours neodymium.

Only the drum motor consumes energy. Permanent magnetic drums require no electricity for the magnetism itself, so there is no electromagnet to energise and no loss of separation ability during a power outage. Maintenance is correspondingly low, and the construction is wear resistant stainless steel built for harsh industrial environments.

When the volume is high, the contamination is constant, or stopping the line for cleaning is expensive. A grid or a plate costs a fraction of a drum and separates reliably, as long as somebody empties it on schedule. Once that schedule cannot be kept, the drum pays for itself in avoided downtime and in damage that never happens to crushers, mills, extruders and conveyors.