Characteristics and selection methods of strong magnetic minerals
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Characteristics and selection methods of strong magnetic minerals
Magnetic characteristics of dry magnetic separators for ferromagnetic minerals:
The ferromagnetic mineral represented by magnetite belongs to a ferrimagnetic substance and has a magnetic domain structure. The magnetic domain is a small area of ​​spontaneous magnetization existing inside the magnetite without an external magnetic field. It has a volume of about 10-15 m3 and contains about 1015 atoms. Each magnetic domain has a certain spontaneous magnetization direction, and the spontaneous magnetization directions of the magnetic domains are inconsistent. From a macroscopic point of view, the magnetizations of the magnetic domains cancel each other out, so the whole is not magnetic. When the applied magnetic field is gradually increased, the magnetic domain whose spontaneous magnetization direction coincides with the direction of the applied magnetic field is expanded until the other magnetic domains are swallowed, and the magnetite exhibits strong magnetic properties. After the magnetite is magnetized by the external magnetic field, the applied magnetic field is removed, and its magnetic properties do not completely disappear.
Instead, some of the remanence is retained. This is due to the fact that the magnetic domain cannot be restored to its original shape. In addition, the magnetism of magnetite is also related to the shape and particle size of the particles. In terms of shape, the long strip is stronger than the spherical magnet; in terms of particle size, the coarse particles are stronger than the fine particles.
The effect of strong magnetic minerals on the magnetic separation process:
(1) Since ferromagnetic minerals such as magnetite are strong in magnetic properties, they can be recovered by using a lower magnetic field.
(2)
D5 (the iron ore particles retain magnetization once magnetized, when the particle size is fine, the particles will attract each other into a magnetic group or a magnetic chain. The magnetic cluster is not easy to disperse, and if it contains gangue particles, it will lower the grade of the magnetic product. If a magnetic cluster is present in the ore-feeding of the classification operation, the classification efficiency is lowered. This is an adverse effect of the magnetic cluster m. In this case, a demagnetizer can be used to eliminate the residual magnetism and destroy the magnetic agglomeration.
(3) The fine-grained magnetite particles are weak in magnetic properties and have a large resistance when moving in water. Therefore, a large magnetic force is required for recovery, and the water flow easily washes away the metal, causing metal loss. It can be seen that the grinding process should reduce the over-grinding as much as possible.
(4) If the monomer in the grinding process is not sufficiently dissociated, the continuous particles of magnetite and gangue will appear. Although the gangue is mostly a non-magnetic mineral, because the magnetite is very magnetic, it is subjected to a magnetic force that can bring its associated gangue into the magnetic product, which reduces the grade of the magnetic product. If this part of the continuum is to be separated from the magnetic product, fine sieving, flotation, re-election or other sorting methods are required.
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