The permanent magnet type magnetic separator can be divided into three types: forward flow type, reverse flow type and semi-reverse flow type according to the structure of the bottom of the tank. The type of the bottom of the box has a great influence on the selection index and operation.
[1] Downstream type permanent magnetic cylinder magnetic separator
The direction of the ore is consistent with the direction of rotation of the cylinder or the direction of movement of the magnetic product, as shown in Figure 1 and
Figure 1 
Figure II [next]
   The downstream magnetic separator has a large processing capacity and is suitable for roughing and selecting coarse magnetic grade materials (greater than 6 mm), or for recovering magnetic heavy medium, and can also be used for multiple series work.
However, the selection index of this magnetic separator is highly influenced by the amount of ore given and is responsive. When the amount of minerals is large, the magnetic ore particles are easily lost to the tailings. Therefore, it is necessary to strengthen the operation and control the lower level of the slurry.
(2) Countercurrent magnetic separator
The direction of the ore is opposite to the direction of rotation of the cylinder I or the direction of movement of the magnetic product (as shown in Figures 3 and 2b ). Pulp particles discharged from the mine to the tank 3 directly below the magnetic system, the magnetic and non-magnetic mineral particles is weak ore tailings by a cylindrical hole in the base plate below the left edge of the magnetic system. The magnetic ore particles are brought to the concentrate end with the cylinder against the ore supply direction and discharged into the concentrate tank.
Figure III
   This magnetic separator is suitable for rough selection and sweeping of fine-grained ferromagnetic minerals with a particle size of less than 0.6 mm. This is because the tailings discharge is far from the mine end. The selection time is longer and the recovery rate is higher, while the concentrate discharge end is closer to the mine mouth and the magnetic turnover effect is poor, so the concentrate grade is lower. The countercurrent type magnetic separator is not suitable for processing coarse ore. Because of the coarse particle size, the ore particles are easily deposited to block the sorting space.
Third, semi-reverse flow magnetic separator
Attraction to the magnetic field direction which direction is substantially the same ore (such as semi-permanent counterflow drum separator shown in FIG. FIG di C) into the pulp is not candidate space from a lower bottom, the magnetic mineral particles is more easily attracted to the On the surface of the cylinder, and with the cylinder to the weakest point of the magnetic field at the edge of the magnetic system, it is discharged into the concentrate tank. Non-magnetic ore particles or magnetically weak ore particles flow through the left edge of the magnetic system against the direction of rotation of the cylinder and are removed from the rectangular holes in the bottom plate. Therefore, the level of the slurry in the bottom box can be kept constant, and the gap between the bottom plate and the cylinder can be adjusted within a certain range ( 30-40 mm).
This type of magnetic separator can obtain higher quality iron concentrates. At the same time, good recovery rate can be obtained. Therefore, the semi-reverse flow magnetic separator has been widely used in production practice. It is suitable for the roughing and selection of strong magnetic minerals with fine particles less than 0.2 mm. It can work in multiple stages to achieve multiple selections.
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