report 9 - 1.0 AIM 2.00INTRODUCTION 1 23 Rapid Disc Dry...

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1.0 AIM 2.00INTRODUCTION 1 23 Rapid Disc Dry Magnetic Separator Rapid disc dry magnetic separators (RDS) are commonly used throughout Australia, Sri Lanka and India for the separation of beach sands on an industrial scale 4 . The method utilizes a series of rotating discs held close to the surface of a feed belt. Stationary electromagnets are situated beneath the belt and induce an electromagnetic field, attracting magnetic particles towards the surface of the discs. Upon contact with the disc, the particles migrate radially outwards off the belt. Particles that have lower magnetic susceptibilities progress through the discs operating at higher field strengths until they are discharged off of the belt. The RDS system is illustrated below in Figure 2.02 5 . Figure 2.02 Mechanism of Separation for RDS 4 Wills, B.A. Mineral Processing Technology 5 Wills, B.A. Mineral Processing Technology Page 1
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Frantz Isodynamic Dry Magnetic Separator Essentially, the Frantz Isodynamic Magnetic Separator (FIS) is an electromagnet that has two long pole pieces shaped to a special contour with a narrow air gap dividing in between. Within the air gap is a feed chute, which is commonly orientated so that it is inclined both parallel and perpendicular to its length 6 . Particles are forced to separate according to their magnetic susceptibilities as a result of the outward magnetic force produced by the electromagnet. A splitter at the end of the chute directs the two streams (magnetic and non magnetics) into two separate sample containers. The principles of the FIS are illustrated in Figure 2.03 below. Figure 2.03 Mechanism of Separation for FIS Carpco Electrostatic Separator 6 Svoboda, J. Magnetic Methods for the Treatment of Minerals Page 2
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The Carpco Electrostatic Separator (CES) separates materials according to their surface conductivity (high tension mode) or by preferential charging and attracting materials to an electric field of opposite charge (static mode). During the high tension mode, feed is introduced to the CES in a single layer onto the rotating drum which is earthed through the mounting frame. The particles pass through an ionized air region where a charge is imparted on the particles. Separation occurs when non-conducting particles retain their charge and become pinned to the drum, travelling the longest distance until
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report 9 - 1.0 AIM 2.00INTRODUCTION 1 23 Rapid Disc Dry...

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