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MATERIALS HANDLING


In operation, a controlled rate of material is fed from a hopper or vibratory feeder onto the rotating induced magnetic roll (roll speeds vary between 80 to 120rpm). Weakly magnetic material is attracted and either deflected or held to the roll surface. Te trajectory of the non-magnetic material is unhindered, discharging away from the separated material. Captured magnetic material discharges from the roll at a point of lower magnetic intensity, often aided by a brush. A splitter plate is interposed between the two product streams to enable a clean separation. Te IMR is often set up to produce


a ‘middlings’ stream (i.e. very weak magnetic material mixed with non- magnetics) by the addition of a second splitter plate. It is common practice to


have two induced rolls mounted in series on the same unit to enable a double pass for improved separation efficiency and process performance.


Te flexibility of the IMR is popular with many mineral-processing engineers. Te magnetic field strength is variable due to the adjustable electro-magnetic coil and the roll speed is adjustable. In addition, the gap between the induced roll and pole is adjustable to accommodate different feed size ranges. One key advantage of the IMR is the ability to process hot mineral feeds (up to 80-100°C) without compromising the separation efficiency. Tis is unlike the RE, which uses permanent magnets. Te IMR also tends to generate very little static charge on the surface, resulting in minimal carryover of fine particles into


the magnetics fraction. Tis aids higher grades and improved recoveries. Typical capacities for a 1m-wide unit


vary based on mineral type, density and particle size distribution and are ideally determined by laboratory test trials. Typical capacities per metre width are:


• Concentration of ilmenite sands: 4tph • Chromite concentration: 3-5tph • Silica sand upgrading: 2-3tph


THE RARE EARTH (RE) ROLL MAGNETIC SEPARATOR An RE separator features a high-intensity permanent neodymium iron boron magnet head pulley on a short conveyor. Te magnets and interspacing steel poles are aligned to produce intense magnetic forces at points across the whole width of the pulley. Te system is suited to


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