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MATERIALS HANDLING


SEPARATION SOLUTIONS


Paul Fears details the latest technology for the purification of dry non-metallic minerals


H


igh-intensity magnetic separators remove ferro and para magnetic particles from dry non-metallic minerals. However, the design of the separation system dictates the final product purity and product losses. Te two most common designs of dry high intensity magnetic separator are the induced roll (IMR) and the rare earth (RE) roll. Bunting Magnetics is a leading designer and manufacturer of magnetic separators and metal detectors for the recycling, quarrying and mining industries. Its wide range of metal separation and detection


equipment is manufactured at its Master Magnets facility just outside Birmingham, UK. Over several decades, the Master Magnets technical team has developed an extensive portfolio of high-intensity magnetic separators for purifying and concentrating minerals. Laboratory-sized versions of many of the designs are found in the firm’s Technical Test Facility in the UK. High-intensity magnetic separators


are used widely in the mineral processing industry to purify non-metallic minerals such as silica sand or feldspar, and in the ceramics sector to cleanse spray-dried powders and raw materials.


SMART


An induced roll (IMR) magnetic separator in operation


Selecting the optimum separation system is often determined through controlled laboratory tests. Representative samples are tested on laboratory-scale versions of the IMR and RE Roll, which confirm capacities and separation performance.


Rare earth (RE) roll system 42 www.engineerlive.com


THE INDUCED ROLL MAGNETIC SEPARATOR (IMR) Te IMR uses electromagnetically generated high-intensity magnetic fields to continuously separate small paramagnetic particles from materials with a particle size range between -2mm to 45 microns. Te IMR comprises an electro-magnetically induced steel roll positioned between a bridge bar and pole piece. Te peak magnetic field generated on the induced roll is 2.2 Tesla (22,000 Gauss).


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