Low intensity Magnetic Separators

In mineral processing plant, Low-intensity magnetic separators have flux densities up to 2,000 gauss. These separators are mainly used to remove ferromagnetic materials, such as iron, to protect downstream unit operations, such as conveyor belts, or to scalp ferromagnetic materials to improve the performance of permanent or electromagnetic separators used to separate weakly magnetic materials. Low-intensity separators can treat wet slurry or dry solids.
Protective Magnets
The device most widely used to protect downstream operations from tramp iron is a magnetic pulley installed in the head of the belt conveyor (Figure1). These devices remove tramp metals from dry solids. They contain either a permanent magnet or an electromagnet. Many types of magnets can be used—for example, plate magnets, cross-belt magnets, cobbing magnets, grate magnets, magnetic humps, and magnetic filters. The arrangement of magnetic drum separators is shown in Figures 2A and 2B.
Wet Magnetic Separators.
 Low-intensity wet magnetic separators have been the workhorse of the iron ore industry for several decades. Iron ore rich in magnetite has traditionally been enriched by these magnets. The coal industry uses these magnets to recover magnetite or ferrosilicon in a media recovery circuit. Several types of separators work on the same principle but have different design features. The common types are counter-rotation drum separators and concurrent-rotation drum separators (Figures 3A and 3B).
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