METHOD FOR MAGNETIC SEPARATION OF MATERIALS AND MAGNETIC SEPARATOR Russian patent published in 2010 - IPC B03C1/14 

FIELD: technological processes.

SUBSTANCE: invention refers to magnetic separation of materials. Method for magnetic separation of materials includes supply of separated material to ferromagnetic bodies and further movement of material along them in magnetic field, gradient of which is perpendicular to vector of material flow speed, separation of material into magnetic and non-magnetic fractions, separation of non-magnetic fraction of material. High-gradient transverse magnetic field is created in circular channel, along which material is moved. Due to excitation of magnetic field near filtering elements, process of magnetic phoresis is provided for weak-magnetic particles with sizes below 100 micrometre. All dispersed particles located at identical distance from filtering elements relative to axis of separated material flow motion get into quasi-homogeneous excited magnetic field of identical intensity H. Filtering elements represent spiral of thin round bar, for instance wire of soft magnetic ferromagnetic material wound as spiral onto external surface of inner body of magnetic separator with deepening into surface aflush, as they are magnetised with external magnetic field having intensity Ho. Distance between wire turns equals 3-5 its diametres, which provides for insignificant effect at excited fields of each other. Magnetic separator comprises loading channel and unloading channel for magnetic and non-magnetic fractions, working element, inside of which there is a magnetic system installed having permanent magnets with alternating polarity. Working element represents inner and outer bodies made of non-magnetic material, with two magnetic systems of permanent magnets, divider for separation of material flows into magnetic and non-magnetic fractions. Filtering element of spiral form represents thin wire wound onto outer surface of inner body and made of soft magnetic material with pitch of 3-5 wire diametres with deepening aflush with surface of filtering element. Magnetic system in annular gap between bodies creates radial external pseudo-homogeneous magnetic field of Ho intensity along flow axis.

EFFECT: improved efficiency of separation.

2 cl, 2 dwg