Why does the magnetic field of the magnetic separator have to be a non-uniform magnetic field?

According to the distribution of the magnetic field strength, there is a distinction between a uniform magnetic field and a non-uniform magnetic field. The so-called uniform magnetic field means that the magnetic field strength at each point in the magnetic field is the same. Otherwise it is a non-uniform magnetic field. As shown in Fig. 4-3, the distribution of magnetic lines of force is uniform in a uniform magnetic field, and the distribution of magnetic lines of force is not uniform in a non-uniform magnetic field.

The degree of non-uniformity of the magnetic field can be measured by the gradient of the magnetic field. The so-called magnetic field gradient is the value of the change of the magnetic field strength per unit distance, as shown in Figure 4-4.

Let the magnetic field strength at the N pole x1 be H1 and the magnetic field strength at the distance x2 be H2. The magnetic field gradient gradH should be:

In the middle

The amount of change in magnetic field strength at a small distance between two points in the magnetic field. In a uniform magnetic field,

, so the specific magnetic force of the ore particles in a uniform magnetic field

That is, it is not affected by magnetic force. As can be seen from Fig. 4-4, the ore particles are magnetized in a uniform magnetic field. Because the magnetic fields at the two ends are the same, the magnitude of the magnetic force is the same, but the direction is opposite. Therefore, the ore particles are only subjected to the torque, and when they are transferred to the ore. When the long axis direction coincides with the direction of the magnetic field, it stops moving. In the non-uniform magnetic field, in addition to the torque effect, the ore particles are simultaneously subjected to different magnetic forces due to the different magnetic field strengths, that is, magnetic differences are generated at both ends of the ore particles, thereby showing that the entire ore particles are subjected to magnetic force. The action F magnetic = xHgradH â‰ 0, and moves in the direction of high magnetic field strength.

As explained above, the magnetic field of the magnetic separator must be an inhomogeneous magnetic field, otherwise the magnetic ore particles cannot be attracted to the magnetic pole, and thus magnetic separation cannot be performed.

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