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MATERIALS HANDLING


SMARTER Paul Fears reveals how to solve tramp metal problems SEPARATION T


ramp metal exists in all mining operations, causing costly damage to processing equipment. It is defi ned as rogue metal not naturally present in the mined ore and includes digger teeth, pit props, blasting caps, nuts and bolts, and metal originating from process plant wear and tear. Crushers and screens are particularly vulnerable to tramp metal damage, resulting in downtime and out-of- specifi cation material. T e nature of the ore, the process and the tramp metal dictate the optimum separation solution using magnetic separators and metal detectors. Magnetic separators automatically separate iron and steel tramp metal with the most commonly used being overband (with a self-cleaning belt) and suspension magnets (manual- clean magnet block), both installed


over conveyors. T e enclosed casing of permanent magnets or an electromagnetic coil generates the magnetic fi eld. Many mining operations feature wide


conveyors transporting large volumes and deep burdens of ore. Subsequently, this raises the overband magnet’s suspension height, as well as creating a more diffi cult separation environment. In such applications, the electromagnetic


TN77 metal detector from Bunting mounted on an aggregate conveyor


fi eld’s shape and strength enables the best separation, especially of smaller tramp iron such as bolts and nuts.


MAGNETIC HEAD PULLEYS A second option, the permanent or electromagnetic magnetic head pulley, replaces the head pulley of a conveyor and produces enhanced tramp ferrous metal separation. On a conveyor, tramp iron migrates to the bottom of the burden, closer to the surface of the magnetic head pulley, which attracts and holds metal onto the surface of the conveyor. As the returning conveyor leaves the under-surface of the pulley, separated metal falls away under gravity into a designated collection area. T e magnetic head pulley suits existing installations with limited space, restricting the installation of overband or suspension magnets over conveyors. T e drum magnet achieves the highest level of tramp metal separation, with


Magnetic pulley magnets destined for an iron ore mine in Scandinavia


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