MATERIALS HANDLING
Laboratory magnetic separator
handle materials with a particle size range between 15mm and 75 microns, although optimum separation is achieved by having a material with a narrow particle size distribution. In operation, a thin and evenly spread
layer of material is fed from a vibratory feeder onto the short centred thin conveyor belt. As the material moves towards and onto the magnetic head roll, magnetically susceptible material is attached to the high-intensity magnetic poles. Te attracted material is either deflected or held by the magnetic field and falls into a collection chute underneath the head roll. Non-magnetic material is discharged forward of the roll in a normal trajectory. An adjustable splitter divides both fractions.
Te magnetic strength of the permanent rare earth roll is adjusted by using different thicknesses of belt. Material trajectories are set by altering the conveyor speed using an inverter control and adjusting the splitter chutes. Te spacing between the poles on the magnetic
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“One key advantage of the IMR is the ability to process hot mineral feeds (up to 80-100°C) without compromising the separation efficiency”
roll is set to suit different particle size ranges.
RE separators have roll diameters of 75mm, 150mm and 200mm and widths up to 1.5m. Multiple configurations of rolls enable enhanced separation. Typical applications include the removal of iron mineral contamination from silica sands, feldspar and other industrial minerals, as well as processing of granulated slag, ilmenite upgrading, beach sand processing, and recycling applications such as crushed glass. Typical capacities range from 2 and 4tph, depending on the specific application.
MAGNETIC SEPARATOR SELECTION
Both the IMR and RE separator produce high-intensity magnetic fields to separate
ferro and para magnetic minerals. Te electromagnetic IMR offers greater magnetic field flexibility and is able to handle high temperature materials. Te RE separator has a permanent magnetic roll and therefore has a low power consumption. Te design is also more compact, which reduces the amount of space used in a processing plant. Ultimately, the separation
performance will dictate which magnetic separator is selected for a specific application.
Paul Fears is with Bunting Magnetics.
www.buntingeurope.com
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