When the content of magnetic materials in raw materials is not high, the ore layer should be thinner. If it is too thick, the magnetic particles in the lowermost layer are subjected to the pressure of the upper layer material, and the magnetic force cannot be sucked up, resulting in a decrease in the recovery rate. When the content of magnetic particles is high, the ore layer may be thicker. ( 2) Magnetic field strength and working clearance. It has a close relationship with the particle size, magnetic height and operation requirements of the material to be treated. When the working gap is constant, the magnetic field strength between the magnetic poles is determined by the number of ampere turns of the coil, and the number of turns cannot be adjusted. Only the excitation current can be changed. Size to adjust the magnetic field strength.
For the selection of red magnetic masters, the weaker magnetic field should be used to deal with weak magnetic magnetic materials and sweeping operations. The field strength should be higher.
When the current is constant, changing the working gap can not only change the strength of the magnetic field, but also change the magnetic field gradient, and reduce the magnetic force of the gap sharply. Generally, the particle size should be reduced as much as possible to increase the recovery rate. When selecting, it is best to increase the gap to increase the selectivity to improve the grade, but at the same time increase the excitation current to ensure the required magnetic field strength. ( 3) Feeding speed. The feed rate is determined by the speed of the vibrating trough (or belt). Its speed determines the mechanical force of the time when the ore stays in the magnetic fear. The higher the speed, the shorter the ore stays in the magnetic field. The mechanical force of the ore is mainly gravity and inertia. Gravity is a The constant, inertial force is proportional to the square of the velocity. The magnetic field of the weak magnetic ore particles is not much more than the gravity in the magnetic field. Therefore, if the speed exceeds a certain limit, the magnetic force of the adsorption will be insufficient due to the increase of the inertial force, resulting in a decrease in the recovery rate. Therefore, the selection of weak magnetic minerals should be lower than the rate of feeding of ferromagnetic minerals.
Generally, when selecting, the raw materials have more monomer particles and stronger magnetic properties, and the ore-feeding speed can be increased. When sweeping, the raw materials contain more connected organisms and the magnetic properties are weaker, so as to improve the recovery rate. The ore speed should be lower; when handling fine particles, in order to facilitate the looseness of the ore particles, the frequency of the vibrating trough should be high and the amplitude should be small; when the coarse particles are treated, the opposite is true.
Suitable operating conditions should be determined experimentally based on the nature of the ore and the quality of the sorting. When a noble metal ore treatment, the level of the narrow material should be dry to the mine, will help improve the indicators, the use of a wide grade ore, its size difference between the larger particles are subjected to a magnetic force, but also increases the difficulty of selecting the sorting conditions Experience has shown that the more grades of raw sieves, the better the indicators. In a selected plant in China, the original granules are divided into 2 (3) ~ 0.83 (20 mesh) mm, 0.83 ~ 0.2 (65 mesh) mm and 0.2 ~ 0 mm, respectively, which is 10% higher than the unclassified index. The moisture in the raw material can make the ore particles adhere to each other, the finer the particles, the more serious the adhesion, so the moisture allowed by the raw materials of different levels is different. Generally -3mm of raw material allows water to not exceed 1%, and the finer the particles. The stricter the requirements.
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