   The magnetic system is the main part of the magnetic separator. The performance of the magnetic separator is not only related to the magnetic material and magnetic field characteristics, but also has a great relationship with the magnetic structure.
Weak magnetic field magnetic separators are generally designed as open magnetic systems, as shown on the left in the figure below.
It is composed of a magnetic pole 1 and a bottom plate 2 which are bonded and laminated by a permanent magnet magnetic block, and a yoke 3 . This is a three-pole magnetic system with a magnetic envelope angle of a and an adjacent magnetic pole with a distance L. It can be seen from the figure that the magnetic force line starts from the N pole and reaches the S pole through a large air gap. Since the magnetic resistance of the air is large, the magnetic field formed is a weak magnetic field, so it is suitable for selecting ferromagnetic minerals.
   On the right is shown in FIG closed magnetic system, which consists of a first magnetic pole, the iron core 2, a coil 3, a yoke 4 and 5 composed of the working disk. Due to the small air gap between the poles, a strong magnetic field is easily generated. Therefore, the strong magnetic field magnetic separator that selects weak magnetic minerals is designed to close the magnetic system. In order to further increase the magnetic field force of the closed magnetic system, the air gap can be reduced to reduce the magnetic resistance. However, this will reduce the selection space and reduce the processing capacity of the device. Therefore, the magnetic field is improved from the form of the magnetic pole pair and its geometric size, and a magnetic magnetic medium with a high magnetic permeability between the two magnetic poles is used to increase the magnetic field. force. For example, if an integral sensing medium (roller, rotating cone or turntable) is placed between the two original magnetic poles to form a magnetic circuit, a plurality of sensing media (shaped plates, balls, and the like) may be placed between the original magnetic poles. A column or a net, etc.) constitutes a magnetic circuit.
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