Chute Magnet Separator Checks Magnetic Susceptibility

By Paul Fears | 07 December 2020

The Chute Magnet Separator or Magnetic Slide is a simple but important laboratory-scale wet magnetic separator for any material test facility.  This magnetic test equipment enables the assessment of a particle’s magnetic susceptibility, which provides the platform for further tests on specific wet magnetic separators.

The Chute Magnet Separator

Wet magnetic separation techniques are employed when processing slurries (i.e. the process includes wet ball mills or flotation), or when the fine particle size dictates a wet processing route.

The Chute Magnet Separator mimics a Wet Drum Magnetic Separator and features a sloping stainless-steel chute positioned over a permanent Barium Ferrite Plate Magnet.  The Plate Magnet generates between 400 and 600 Gauss on the surface of the chute.  This level of magnetic field captures ferro-magnetic particles including magnetite, ferro-silicon, iron-scale, and abraded tramp metal from processing plant.  The Chute Magnet Separator is not suitable for separating paramagnetic minerals.

Chute Magnet Separator in Operation

In operation, a slurry is fed down the chute with magnetic particles being held onto the surface whilst non-magnetic particles continue to flow into a collection receptacle.  To recover the magnetics, the chute is hinged up and away from the Plate Magnet, washed off the chute with water, and collected in a separate container.

The most common users of the Chute Magnet Separator include mineral processing and recycling test facilities and universities.  Testing on the Chute Magnet Separator commonly occurs prior to tests on a high-intensity magnetic separator (e.g. Electromagnetic Filter) to assess the content of strongly magnetic particles.  When such magnetically strong particles enter a high-intensity magnetic separator, they block the matrix and significantly compromise the separation performance of weakly magnetic particles.

Checking Wet Drum Magnetic Separator Performance

In coal processing and heavy media plants, where Wet Drum Magnetic Separators recover the media such as magnetite and ferro-silicon, regular tests on the Chute Magnet Separator identify the relative performance of the magnetic separators.  An increased level of magnetite or ferro-silicon in the slurry post-magnetic separation is indicative of a drop in performance of the Wet Drum Magnetic Separators, commonly remedied with simple adjustments.

Chute Magnet Separators are also used in the water treatment sector to assess the level of magnetics in a water supply.

The Chute Magnet Separator is part of Bunting’s extensive range of laboratory-scale magnetic separators.

For further information on the Chute Magnet Separator or any other equipment in the Laboratory-Scale range, please contact our technical sales team on:

Email: Gordon Kerr at

Via the website

Telephone:  +44 (0) 1527 65858

All photographs and video taken by Paul Fears Photography

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