METHOD OF DRY MAGNETIC SEPARATION OF SLIGHTLY MAGNETIC MATERIALS WITH ELECTRIC REMOVAL OF MAGNETIC PRODUCT AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2009 - IPC B03C1/10 

FIELD: mining.

SUBSTANCE: invention relates to dry magnetic separation of slightly magnetic materials by magnetic properties in metal mining industry, chemical industry, pharmaceutical industry and other industries. Dry magnetic separation of slightly magnetic materials involves supplying of the material being concentrated to the magnetic field created by a magnetic roller around the horizontal axis. Moreover, retention of magnetic grains in the magnetic field under the action of a magnetic force directed to the roller surface, removal non-magnetic grains out of the magnetic field under the action of the gravity force to the non-magnetic seperation product, removal of magnetic grains beyond the zone of removal of non-magnetic grains by rotation of the magnetic roller and the following removal of the magnetic grains to the magnetic seperation product. The material to be concentrated is supplied directly on the magnetic roller surface which is electroconductive. In order to provide seperation of magnetic grains from the roller and the following removal in the magnetic product, beyond the zone of removal of non-magnetic grain an electric field is set up between the magnetic roller and the non-magnetic electrode. Voltage of the opposite sign is supplied on them with intensity that makes the electric force separating the magnetic grains from the roller surface stronger than the magnetic force retaining these grains against the roller surface. A dry magnetic separation device includes a roller with a horizontal axis of rotation collected from permanent magnets, feeding device to supply material to be concentrated, devices to receive non-magnetic and magnetic products of separation. The roller is electroconductive and there is an electrod located along the entire length of the magnetic roller and there is a gap as viewed from the device in order to receive the magnetic product.

EFFECT: arrangement of conditions to remove the magnetic grains attached to the magnetic roller surface without using a tape as well as reduced operational costs and improved reliability of the separator operation.

10 cl, 1 dwg