Permanent magnet drum magnetic separator, depending on the bottom structure can be divided into downstream and counterflow with three semi-counterflow.The bottom of the type of sorting indicators operation. (A) downstream permanent drum magnetic separator to the mine the direction of the movement direction of the cylinder rotation direction or magnetic product.Pulp into the cylinder under the magnetic system to mine box directly to the non-magnetic mineral particles and magnetic weak mineral particles discharged by the gap between the floor of the cylinder below the magnetic mineral particles are sucked on the surface of the cylinder, and at the magnetic field is weak, together with the cylinder is rotated to the edge of the magnetic system by unloading ore pipes to concentrate tank positions. Downstream magnetic separator processing capacity, suitable for rougher treatment than the coarse fraction (greater than 6 mm) of the ferromagnetic materials and selected job, or for the recovery of the magnetic heavy media also multi-station series . However, this magnetic separator sorting indicators by to mine the amount responsive. When to mine large, magnetic mineral particles easily lost in the tailings. Therefore, to strengthen the operation and control of the lower level of the pulp. (B) counterflow separator opposite to the mining direction and the direction of rotation of the cylinder or the moving direction of the magnetic products. The pulp from the box to the mine directly to below the cylindrical magnetic and non-magnetic mineral particles and magnetic weak mineral particles tailings discharge hole on the floor below the left edge of the magnetic system, magnetic mineral particles to the mine with the cylinder against the direction was taken to concentrate end, routed to concentrate tank. This magnetic separator suitable for particle size of less than 0.6 mm fine strong magnetic minerals rougher and scavenger flotation operations. This is because the the tailings outlet from far to the mining side. Sorting time is longer, higher recovery and concentrate discharge end away from the product closer to the mine poor magnetic turned, so the lower concentrate grade. The countercurrent type magnetic separator unfit handle coarse ore, because the coarse particle size, mineral particles deposited thereby clogging sorting space. (C) a semi-countercurrent separator its to the mining direction and the magnetic field attraction direction substantially the same, the slurry is entering the sorting space from the groove bottom lower magnetic ore particles can be more easily attracted to the surface of the cylinder, and with a cylindrical Go to the edge of the magnetic system with the magnetic field is weakest at row unloading to concentrate tank. The mineral particles of non-magnetic mineral particles or magnetic weak against the cylinder rotation direction flows through the magnetic system of the left the left edge and from the rectangular hole in the floor drain away. Thus pulp horizontal plane in the bottom tank can be maintained constant, the gap between the base plate and the cylindrical can adjust within a certain range (30-40 mm). This type of magnetic separator can get higher quality iron ore concentrate. Also able to get a good recovery.Semi-current magnetic separator widely in the production practice.
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