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How to Improve the Processing Efficiency of Magnetic Separator?

Xinhai 2020-01-06(05:01:46) 537 0

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Magnetic-separator

Magnetic Separator is an indispensable machine for magnetic ore dressing plant. Here we'll give you accessible method to improve the processing efficiency of magnetic separator:

  1. Realizes monomer separation of feeding minerals 

  2. Keep the appropriate concentration of slurry pulp

  3. Adjust a reasonable rotate speed of magnetic separator


Before talking about the methods, let's see what's the working principle of magnetic separator first:

The magnetic minerals is magnetization under uneven magnetic field, and absorbed on the magnetic separator cylinder. Then they are taken to the row of ore terminal as magnetic product. While the non-magnetic minerals are less influence from the magnetic field, still in the slurry as non-magnetic product.

If you want to achieve the ideal magnetic separation effect, you must pay more attention in the following tips to obtain a good processing index. Let's go on!

1. The particle size of feeding minerals realizes monomer separation

The particle size of feeding minerals is an important influence factors of magnetic separator effect. 

For most ores, the particle size of feeding minerals means the degree of monomer separation, which is also the separation degree of magnetic ore and gangue mineral. 

  • If the particle size of feeding minerals is small, it means the separation degree is high. It is easy to get satisfying processing index.

  • If the particle size of feeding minerals is coarse, which means the separation degree is low, the magnetic minerals are still combined with part of gangue minerals. This kind of connective directly affects the ore dressing index and makes the concentrate grade lower. 

Therefore, the ore particle size of the magnetic separator must fully realize monomer separation.

2. Keep the appropriate concentration of slurry pulp

Here the concentration of slurry pulp is mainly the overflow concentration of classifier. 

  • The concentration of pulp is too high, and the concentration of concentrate is too high. In this case, the concentrate particles are easily covered and wrapped by the finer gangue particles, leading to the difficulty in separating the two and seriously affecting the concentrate grade. 

  • The pulp concentration is too small, which means the concentration of separation is too low, resulting in an increase in the flow rate, shortening the separation time, and making some fine magnetic particles that could be recovered into the tailings and discarded. The concentration of slurry pulp is less than 35%, about 30%. 

Of course, the mineral processing plant can decide according to the requirement and situation.

3.  Adopt the reasonable rotate speed of magnetic separator

The rotate speed of magnetic separator can largely influence the capacity of magnetic separator, and then impacting the concentration quality. 

  • The higher rotate speed is, the larger magnetic separator capacity is. At the same time, the less magnetic ligneous bodies and gangue minerals are difficult to distinguish. Only minerals with large magnetic can be separated. 

  • The lower rotate speed is, the smaller the magnetic separator capacity is. By the magnetic induction, ore particles with weak magnetism can also be sorted out, which affects the quality of concentrates.

Generally, small diameter magnetic separators with high speed, large diameter magnetic separators with low speed. Taking the permanent magnetic separator as example, the rotate speed of magnetic cylinder is 20r/min when the diameter is 1000mm, while the rotate speed is 30r/min when the diameter is 1200mm.

4. Adjust the magnetic system angle

Generally, the magnetic deflection indicating device is located on the shaft head near the drive side. The size of magnetic deflection can be adjusted by adjusting the nut. Its influence is most inflected on the quality and recovery rate of concentrates. 

Taking permanent magnetic separator as an example:

  • The smaller magnetic system angle is, the easier to separate small magnetic minerals. It is helpful in increasing recovery rate and reducing the grade of tailings at the same time. 

  • The larger magnetic system angle is, the easier to separate the large magnetic minerals, which can improve the quality of concentrates.

However, the magnetic system angle cannot be adjusted at will. It must be adjusted according to the requirements of magnetic separation. Generally, the magnetic system angle is average 15-20°. The magnetic system angle will not change unless large requirement changes.

Conclusion

Therefore, we can improve the processing effect of magnetic separator from the above four points. Mineral processing experts suggest that before the purchase of magnetic separator equipment, the mine owner should consult professional magnetic separation mechanism manufacturers and investment costs and other actual conditions, get the ideal magnetic separation parameters, to correctly guide the operation of the magnetic separator, to obtain the ideal separation effect.

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