What are the factors that influence the selection of permanent magnet cartridge magnetic separators?

There are many factors affecting the operation of the permanent magnetic cylinder magnetic separator. In addition to the bottom box type, magnetic structure and magnetic field characteristics, there are magnetic system declination, working gap, sorting concentration and cylinder rotation speed. If the magnetic system declination is not appropriate, it will obviously affect the sorting index. The so-called magnetic system declination is the angle between the center line of the magnetic system arc surface and the vertical line of the cylinder center. After the magnetic system, the tailings grade is low, but after the large deviation, the grade of the tailings is increased because the concentrate cannot be lifted to the concentrate end. If the magnetic system is ahead of the head, the concentrate will be lifted too high, the sweeping area will be shortened, and the tailings grade will be raised, so the magnetic system declination should be adjusted to a moderate position. The distance between the cylinder surface of the rough selection zone and the bottom plate of the tank is called the working clearance. The size of the working gap will affect the effect of sorting. A large gap, a large flow of the slurry also help to improve the processing amount, but far away from the cylinder surface, a lower magnetic field strength, the tailings grade will raise, lower metal recovery.
Conversely, if the working gap is small, the magnetic field force is increased, and the concentrate grade is lowered, but the recovery rate can be higher. 'If the working gap is too small, the slurry flow rate will be too fast, so that the ore particles can not be sucked to the surface of the cylinder and will be brought to the tailings by the slurry flow, which will cause the tailings grade to rise, and even the tailings will be difficult to discharge. Slot phenomenon. Therefore, care should be taken to ensure proper working clearance during the installation and maintenance of the magnetic separator. The size of the sorting concentration determines the slurry flow rate of a certain amount of minerals, which affects the sorting time of the ore particles. The concentration is high, the flow rate is slow, the resistance is large, and the gangue is easily mixed in the concentrate to reduce the quality of the concentrate. However, due to the long selection time, it is beneficial to the recovery rate. If there is a low concentration, the concentrate grade can be higher, and the tailing grade will also increase, which will reduce the recovery rate. The rotation speed of the cylinder also has an influence on the selection index. The rotation speed is low, the output is low, the rotation speed is high, the centrifugal force of the ore particles is large, the magnetic turnover effect per unit time is increased, the concentrate grade and processing capacity are high, and the recovery rate is lowered. . In practice, it is important to adjust the blown water of the ore to the rinse water of the concentrate. The blown water is too large, and the pulp flow rate is too fast, which will increase the grade of the tailings. On the contrary, the small amount of blown water will make the ore particles not fully loose and affect the sorting effect, so that the tailings grade will increase and the concentrate grade will decrease. The concentrate flushing water is mainly used to remove the concentrate from the barrel, and the size of the flushing water should be able to ensure that the concentrate is discharged.

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