Dry magnetic separation

The family of dry magnetic separators as has been mentioned consists of low- and high-intensity separators. 

The high-intensity dry magnetic separators group may be cited as consisting of induced roll, crossbelt and ring-type separators. 

It may be added here that electrostatic separation suffers from more or less the same disadvantages as dry magnetic separation in that both require a perfectly dry feed, and both have a relatively small capacity for finely divided material. For most efficient operation, it is necessary that the feed be processed in a layer (one particle deep), but this severely restricts the throughput of the electrostatic separation process. 

High impact polystyrene (HIPS), 11 466 20 353, 359-360 23 359, 368 antioxidant applications, 3 121 surface appearance of, 23 363-364 thermoforming of, 23 398—399 High intensity cross-belt magnetic separators, 15 454-455 High intensity dry magnetic separators, 15 450—452... 

Fig. 2.1 The processing of heavy mineral sands, a) Dredger b) Sieve c) Bunker d) Reichert cones e) Spirals f) Magnetic separator g) Dryer h) Electrostatic separator i) Shaking table j) Dry magnetic separator k) Vertical belt conveyer I) Electrostatic separator.

In the Magnex process, crushed coal is treated with vapors of iron carbonyl [Fe(CO)5 ], followed by the removal of pyrite and other high-ash impurities by dry magnetic separation. Iron carboiyl in this process decomposes on the sitrfaces of ash-forming minerals and forms strongly magnetic iron coatings the reaction with pyrite leads to the formation of pyrrhotite-like material. 

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