Abstract: An apparatus for separation of ferromagnetic materials has a working chamber occupied by a ferromagnetic attachment in the form of plates with openings edged by shaped projections, a magnetizing system and means for consolidation of the plates made in the form of an additional magnetic field source, and inlet and outlet connections, respectively, for fluid medium. The spacing of the openings on the plate, their sizes and configuration, the sizes of the projections and the distance between the plates are selected to be variable throughout the volume of the working chamber depending on the magnetic properties and sizes (dispersity) of foreign particles in the fluid medium being purified, and viscosity of the fluid medium.