Plate magnets are incorporated in chutes and ducts to remove both tramp iron and iron of abrasion. The plate consists of a series of alternating poles, uniform across the chute width and alternating along the chute length. As the material passes over the magnet face, tramp iron is trapped on the magnet face while the remaining non-magnetic material proceeds down the chute. It must be cleaned and inspected daily since they are not effective if the accumulated tramp iron is allowed to remain on the face. The magnetized plates are usually of permanent magnet type, either ferrite or rare earth. The effective depth of the magnetic field can be as high as 200 mm, depending on the type of the magnetic material and on the shape of particles to be removed.

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