Induction separators CHARACTERISTICS • Depending on the input stream to the unit, the useful width of the separator belt is sized such that in order to achieve the same effectiveness in sorting of aluminium with a greater flow of materials, a greater useful width is required. • The sorting effectiveness values obtained experimentally for induction separators in packaging sorting plants are 90% aluminium separated out of the aluminium input in the unit. • Requires feeding that is evenly dosed and distributed along the width of the belt, so that the width of the supply belt to the induction separator must be similar to the useful width of the unit. • Requires the metals to be selected to be as free as possible from other materials, so that the belt speed must be high. The induction separator belt speed must be variable, between 2 and 2.5 m/s. • The rotor speed is adjustable and must be at least 3,000 r.p.m. • The necessary length between rotors of the eddy current separator in order to stabilise the material to select must be at least 2,000 mm. • There is a separation chopper between the selected aluminium chutes and the rejected waste current chutes of the unit, with an adjustable angle. • There is a side cowling and a front protection hood. • At least one rib with a low height must be present along the entire belt in order to detach any ferrous materials which may have attached to the magnetisable drum area. • The induction separator must be fitted with a scraper-cleaner for its belt, in the form of a brush or similar, placed on the return face in order to help maintain clean the separator belt and allow the transverse rib to pass. • Dosing. It is not advisable to dose the induction separator using a vibrating tray as this reduces the transport speed in the tray compared to the conveyor belt, and therefore increases the thickness of the layer of materials. This means that the stream discharge on the separator will be irregular and the material separation effectiveness will be reduced. • The installed power of an eddy current separator is the sum of two powers: the conveyor belt power and the rotor power. Depending on the dimensions of the machine, the total power will range from 2.5 kW for smaller models and 6.6 kW for larger models.
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