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Libroplantasingl

these use more power and have a higher investment cost, a single malfunction (actuation, belt, etc.) in a permanent magnet separator would stop the entire line. CHARACTERISTICS • The stream of waste transported by the belt carrying the magnetic materials must pass completely under the radius of action of the magnetic field created by the separator. • Since the attraction force on the ferrous materials created by the electromagnet's magnetic field is inversely proportional to the distance from the core, these units must be able to create a magnetic field density of at least 400 Gauss in view of the distance to the materials to be captured. • The speed of the conveyor belt must be from 1.0 to 1.5 m/s. The speed of the over-band separator must be from 2.0 to 2.5 m/s. • The layer thickness of the waste stream carried by the belt must not be greater than the average size of the magnetic materials to be selected. • The surroundings of the field of action of the magnetic separators (drums, rollers, belt structures, etc.) must be made of non-ferrous, non-magnetisable materials (stainless steel or aluminium). • For separators arranged in line with the conveyor belt, the angle between the slope of said belt and the separator slope must be from 20° to 25°, approximately. In addition, the line perpendicular to the core of the electromagnet that passes through the centre must be tangent to the head drum of the conveyor belt. • For separators arranged transversely to the conveyor belt, the longitudinal slope thereof and the transverse slope of the over-band must be parallel. • The installed power of an over-band magnetic separator for a standard package plant will be from 1.5 kW to 5.5 kW depending on its dimensions. Magnetic separators 4


Libroplantasingl
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