Abstract: The invention is of a process for increasing the productivity and separation efficiency of a short-belt type dry magnetic separator such as is used for separation of magnetic iron ore from gangue. The process includes providing magnets extending in an arc within the pulley head which begins at a location spaced beyond the point where substantially all of the particles are thrown off of the belt surface in the direction of belt travel.

Abstract: An apparatus for removing adherent magnetically attracted particles from the surface of the magnetic head pulley of the conveyor belt used in a dry magnetic separator without disrupting the magnetic separation process. An array of magnetically soft iron tines of several sizes is provided to be moved into and out of close proximity with and substantially normal to the magnetic head pulley surface. When in proximity to the magnetic head pulley, the soft iron tines are induced with a magnetic force and because of their shape, a magnetic field gradient is formed in the direction of the tines having a force sufficient to attract the particles from the head pulley to the tines. When the tines are moved away from proximity with the head pulley, they lose most of their induced magnetism and the attracted particles fall into a discharge chute or collection box.

Abstract: This invention relates to improvements in a dry magnetic separation system for increasing the recovery of magnetic ore from the feed material. The system includes a separator which has a magnetic head-pulley assembly mounted in one end of an endless belt conveyor loop. When the conveyor is run at high speeds some of the ore is thrown off the head-end of the belt instead of being retained on it by the magnetic pulley. Those ore particles that are retained are carried onto the lower flight of the belt from which they are dropped into an ore chute. To recover the magnetic portion of the "thrown" ore, an adjustable splitter is located outwardly of the pulley-head at a lower elevation than the belt. The splitter also directs these partially magnetic particles into the ore chute and the non-magnetics to a tailings chute.