Introduction to the use of demagnetizer for magnetic separator

Introduction to the use of demagnetizer for magnetic separator

Demagnetizer magnetic iron ore dressing plant unique to an auxiliary device. Its role is to eliminate the remanence of magnetite and destroy magnetic agglomeration. Magnetite is a ferrimagnetic substance with a magnetic domain structure that is magnetized immediately after entering the magnetic field of the magnetic separator. After being discharged by the magnetic separator, although some magnetic field is left, some residual magnetism is retained. The amount of remanence is related to the ore properties (such as mineral composition, structure, particle size, etc.), some ore has significant remanence, and some ore does not. obvious.

1. After the magnetic separation, there is grinding and grading operation. For example, after the magnetic pulley is preselected, the regrind grading of the magnetic separation coarse concentrate in the grinding grading or stage grinding process is performed. If there is more residual magnetism in the ore or magnetic separation coarse concentrate after the magnetic pulley is selected, there will still be magnetic agglomeration after entering the classifier after grinding by the grinding machine. The magnetic cluster is generally loose, which contains more water and uses hydraulic power. When grading, the magnetic cluster will enter the overflow, and when grading by the sieve, the magnetic cluster will enter the product on the sieve.

2. Behind the magnetic separation is a fine screening operation. If there is no influence of magnetic agglomeration, the sieved product of fine sieve should be fine in size and higher in grade than on the sieve. This is because quartz and other gangue particles are often thicker than magnetite particles and the density is small; Fine screening plays a role in both classification and sorting. However, if the magnetite particles are agglomerated due to remanence, they cannot pass through the mesh but enter the product on the sieve, so that the efficiency of the fine sieve is lowered, and the sorting effect is deteriorated. It is necessary to demagnetize the fine mesh.

3. Continuous magnetic separation operation, that is, one or several magnetic selection operations are followed. The purpose of the selection is to improve the concentrate grade, and the magnetic cluster is often wrapped in gangue, continuous body or slime, the magnetic cluster does not open, these impurities can not be selected, which will affect the quality of the concentrate. Therefore, demagnetization should be applied to the demagnetization before each selection.

When conditions do not allow, it is best to add at least one demagnetization before or between several selections. Of course, demagnetization is not required when the magnetic agglomeration is not obvious or the concentrate grade is not high.

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