Drum-type magnetic separator

In a dry drum-type magnetic separator, the magnetic force, Fm, acting on a particle on the drum surface is given by... 

Since Fm and Fc are both proportional to the particle volume, the particle size does not figure in the above relationship for the critical rotation speed. This means that the dry drum type magnetic separator can be used in the treatment of a feed containing particles with a wide range of sizes. 

Drum-type electromagnetic separators comprise a stationary set of magnets surrounded by a horizontally mounted rotating drum or cylinder made of a nonmagnetic material. The crushed material is passed over the drum, and any tramp iron contained in it remains clinging to the drum and is carried round to the underside thereof, where there is no magnetic field, so that the pieces of iron fall... 

Drum and Pulley Magnets Since Thomas Edison invented and developed the magnetic pulley for the concentration of nickel ore, drums and pulleys have become the most common types of magnetic separators. These devices can be built with either a permanent magnet or an electromagnet, and the drum separator can operate with... 

FIG. 19-45 Wet-d rum-magnetic-separator arrangements, [a) Counterrota-tion-type wet magnetic drum separator. (Couttesif of Sola International, Inc.) (h) Concurrent-type wet magnetic double-drum separator, (c) Countercurrent-type wet magnetic double-drum separator. 

Magnetic drum selection of alternating polarity drum separators is based on the capacity to be handled and the particle feed size. Recommended capacity and drum-type selections for permanent magnets are as follows, where 0 indicates fines ... 

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