Introduction to the basic principles of magnetic separation

Due to the different magnetic properties between minerals, the magnetic force they enter in the magnetic field of the magnetic separation device is different, so the trajectories are different, and finally they are divided into magnetic products and non-magnetic products (or ferromagnetic products and weak magnetic products) to realize magnetic separation. Separation.

Mineral magnetic differences are the basis for magnetic separation. The magnetic properties of minerals can be measured, and minerals can be classified into three categories according to their magnetic strength:

â‘  ferromagnetic minerals, magnetic iron ore, pyrrhotite, etc., few of these minerals;

â‘¡ weakly magnetic minerals, such as hematite, limonite, ore of titanium, hard manganese ore, manganese ore, garnet and the like, such a large number of minerals;

â‘¢ non-magnetic minerals, most of the non-ferrous metals and non-metallic minerals are minerals belonging to this category. In the magnetic field of the magnetic separator, the ferromagnetic mineral is subjected to the largest magnetic force, the weak magnetic mineral is subjected to a small magnetic force, and the non-magnetic mineral is not affected by the magnetic force or the weak magnetic force. The magnetic field of the magnetic separator is a necessary condition for achieving magnetic separation.

The magnetic field can be divided into a uniform magnetic field and an inhomogeneous magnetic field. The degree of non-uniformity of the magnetic field is represented by a magnetic field gradient, which is the rate of change of the magnetic field strength along the space, that is, the variation of the magnetic field strength per unit length. The larger the magnetic field gradient, the greater the degree of non-uniformity of the magnetic field, that is, the magnetic field strength varies greatly along the space. The magnitude of the magnetic force that a magnetic ore is subjected to is proportional to the product of the magnetic field strength and the magnetic field gradient. If the magnetic field gradient is equal to zero (the uniform magnetic field is equal to zero regardless of the strength of the magnetic field).

Then the magnetic ore particles are subjected to zero magnetic force, and magnetic separation cannot be performed. Therefore, the magnetic boring machine uses an uneven magnetic field. In the process of magnetic separation, the ore particles are subjected to various forces. In addition to magnetic force, there are gravity, centrifugal force, water flow force and friction. When the magnetic force of the magnetic ore particles is greater than the sum of the remaining forces, it will be sucked or deviated from the material flow to become a magnetic product, and the rest is a non-magnetic product to achieve separation of different magnetic minerals.

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