Abstract: Suspended contaminated particles are removed by magnetic separation from a liquid containing ferromagnetic particulate material to which the particles adhere. A plurality of radially extending filter discs are provided on a horizontally disposed rotatable shaft for rotation therewith, the liquid being directed toward the discs and through gaps provided therebetween. Permanent magnets are provided on the discs for producing local magnetic field gradients in the gaps, and the discs have non-magnetic portions outwardly of the magnets along the periphery of the discs. The particulate material is scraped from the discs which adhere thereto when the liquid passes the gaps, and the scraped material is moved outwardly of the discs.

Abstract: A filter disc for a magnetic separator is formed of two wall discs having a layer of permanent magnets arranged between them and in contact with each other. The permanent magnets have holes therethrough and have cut-away corners. The magnets are adhered to the wall discs by glue which enters the openings between and within the permanent magnets.