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Three Factors Affecting The Selection Of Dry Magnetic Separators
Jun 21, 2018

     Dry magnetic separator is suitable for wet magnetic separation of magnetite, pyrrhotite, calciner, ilmenite and so on. It is also used for the removal of iron from coal, non-metallic ore and building materials.


     First, the thickness of the feed layer: it has a great deal to do with the particle size and magnetic particle content of the treated raw material. When dealing with coarse-grained ore, the thickness of the ore deposit is about 1.5 times that of the largest particle. The grain size can reach 4 times the maximum particle size, and the thickness of 10 particles can be reached for fine particles. When the content of magnetic material is not high, the ore layer should be thinner. If it is too thick, the magnetic particles at the bottom are subjected to the pressure of the upper material, and the magnetic force can not suck up, resulting in a decrease in the recovery rate. When the magnetic particle content is high, the ore layer can be thicker.


     Second, magnetic field strength and working gap: it has a close relationship with the grain size, magnetic height and job requirements of the processed materials. When the working gap is fixed, the magnetic field strength between the poles is determined by the number of ampere turns and the number of turns can not be adjusted. The intensity of the magnetic field can only be adjusted by changing the magnitude of the excitation current. For handling selective operations such as red Zun with strong magnetic properties, weak magnetic field should be adopted to deal with magnetic materials with weak magnetism and sweeping operations, and field strength should be higher. When the current is fixed, changing the size of the magnetic field can not only change the strength of the magnetic field, but also change the magnetic field gradient and reduce the gap magnetic field force sharply. In general, the size of the treated particles should be reduced as much as possible to increase the recovery rate. When selected, it is better to increase the gap to increase the selectivity to improve the grade, but at the same time, the magnetic field intensity required by the excitation current should be increased properly.


     Third. Ore feeding rate: the rate of ore feed is determined by the speed of the vibrating slot (or belt). Its speed determines the mechanical force of the mineral particles in the time of the magnetic pause. The greater the speed, the shorter the pause in the magnetic field. The mechanical force of the mineral particles is dominated by gravity and inertial knives, and the gravity is a constant, and the inertia force is proportional to the square of the rate. The magnetic force of the weakly magnetic ore particles in the magnetic field is far from the gravitational force. Therefore, the magnetic force of the adsorbed magnetic force will not be applied to a certain limit due to the increase of the inertia force, which causes the low acceptance rate. Therefore, when the weak magnetic minerals are selected, the ore feeding rate below the strong magnetic minerals should be accepted. As usually in the selection, the quality of the mass guessing mono particles is more, the magnetism is more strong, the rate of ore feeding can be increased. When cleaning, the quality of the mass is more and the magnetism is weaker and the rate of the progressive acceptance is lower. When the fine particles are punished, the frequency of the vibrating groove should be high and vibrate. The size is smaller; the opposite is the case for the punishment of the coarse grain. Appropriate operating conditions should be determined through the implementation of ore quality and quality requirements. When dealing with the punishment of a few metal ores, the material should be linked to the narrow level of drying to the ore, which is beneficial to the progress of the index. If the wide grade is accepted to the mine, the magnetic force of the large and fine particles is quite different, and the selection of the selection conditions is also difficult to choose.


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