Video Explanation of the Induced Magnetic Roll Separator IMR

By Paul Fears | 08 October 2018

The Induced Magnetic Roll Separator (IMR) has been used in the non-metallic mineral industry for decades.  However, the popularity of this high intensity magnetic separator dwindled after the development of the Rare Earth (RE) Roll Magnetic Separator in the late 70s early 80s.  Whereas the magnetic forces in an IMR were electromagnetically generated, high intensity permanent magnets like Neodymium Iron Boron were used in the RE Roll.  As Rare Earth Magnet prices fell, making RE Rolls more economically viable, power costs were rising, further decreasing the popularity of the IMR.  Rare Earth Magnet prices have risen in recent years and there is, once again, renewed interest in the IMR.

High Intensity Induced Roll Separator for Mineral Purification

The Applications

Both the IMR and RE Rolls are used to separate weakly or para magnetic minerals from non-magnetic minerals in a dry state.  These non-metallic minerals are widely used in the production of ceramics, plastics, glass, cosmetics, paper, and many other commonly used materials.  Typical minerals being processed include feldspar and silica sand.

The Methodology

Dr Neil Rowson, a respected mineral processing engineer from the University of Birmingham, explains the operation of a Induced Magnetic Roll Separator.

In the video, Dr Rowson explains how the untreated non-metallic mineral material is fed from a hopper or vibratory feeder at a controlled rate onto a high intensity magnetic roll.  Magnetic material is attracted to the magnetic roll face.  This attraction alters the trajectory of the magnetically attracted mineral away from that of the non-magnetic material.  A splitter plate is positioned between the two different trajectories, enabling a split of the two materials and separation of  the weakly and papa-magnetic minerals.

Mineral Processing Laboratory

The video shows Dr Rowson undertaking test work at the Master Magnets laboratory in Redditch, UK.  Tests are conducted on mineral materials from deposits all over the world.  From the tests it is possible to confirm what separation is possible on what equipment.  This then forms the basis of a separation guarantee for any equipment order.  The Master Magnets laboratory houses one of the most extensive ranges of high intensity magnetic separation equipment in the world.

For further information on Master Magnets and our range of magnetic separation equipment designed for purifying ceramics and non-metallic minerals, please contact us on:


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