The magnetic treatment of industrial minerals is conducted in both wet and dry processes. The decision to process wet or dry is determined by one of two factors; how the end customer wishes to receive the material or the process route needed to achieve the end customer specification. In many cases, non metallic mineral processors prefer to process in a dry state, but the present technology only enables purification when as a slurry. This especially applies when dealing with material with finer particle sizes such as kaolin or calcium carbonate. This paper discusses three magnetic separation techniques presently used to treat dry non-metallic minerals, specifically looking at fine particle processing. The Rare Earth Roll Separator is an industry standard for high intensity dry magnetic separation especially when processing feldspar and silica sand. There have been many developments in magnetic material and design that enable higher capacities and improved levels of separation. A new type of Rare Earth Magnetic Drum, the model RRS, produces high surface fields similar to those of the Rare Earth Roll Separators and has many additional benefits including installation, maintenance and spares. Setting key operating parameters enables the treatment of fine materials with a limited loss of product to the magnetic fraction. The RRS has been used to process a wide range of industrial minerals
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