   The drum type electric sorter actually has a function of classifying according to the particle size. If there is no electric field, according to the centrifugal force and gravity of the ore particles on the drum surface, there will be a classification according to the particle size. The large size and density of the ore particles will be thrown to the farthest place in front of the drum, medium and secondary. The fine particles are closest to the drum. If the electric field is increased, a very important force is added to make the classification more effective.
1. Drum type electric classifier
Figure 1 is a simplified diagram of the drum type electric sorter grading the same material with different precision and different materials.
Figure 1 Drum diagram of drum type electric separator
A. Different grades of the same material size; B. Different poles of different material shapes
1. to the mining bucket; 2. the electrode; 3. the drum; 4. the mining bucket; 5. the graded coarse grain; 6. the flat product
As can be seen from the figure, material grading is the result of the combined action of various forces and can be expressed as follows:
— — — —
F= F e + F c + F g + F r
F= F e + F c + F g + F r
(1)
Where F - comprehensive force, N;
F e - electricity, here is the mirror suction, N;
F c - centrifugal force, N;
F g - gravity, N;
F r - air resistance, N.
For a non-conducting material of the same kind, such as a composite electrode using a corona pole or a combination of a corona pole and a static electrode, as long as the charge attached to the ore particles is small and the centrifugal force exceeds the electric power, the coarse particles must fall on the drum. In the former, its expression is:
F e +F g ≥F e +F r (2)
For medium-sized ore particles, the relationship is as follows, and falls between the coarse particles and the fine particles.
F e +F g >F e +F r (3)
For fine particles, it must fall behind the drum, and its expression is:
F E >F c +F g +F r (4)
Regardless of the classification of the material, fine particles are often easily mixed into the coarse fraction, while the coarse fraction is unlikely to be mixed into the fine grade due to the influence of the gas flow and the electrostatic field.
Second, the room electric classifier
This is based on the difference in electric power, gravity and air resistance during the falling process of the ore particles, so that the trajectories of the falling are different, so that the ore particles can be classified according to the particle size. [next]
Figure 2 is a schematic diagram of the principle of the chamber classifier. The material is fed into the space of the corona pole 2 and the grounding pole 3. Here, the electric charge is obtained. After the particles with small particle size are charged, the surface charge is larger than that of the surface electric field. However, the mass is small, and the gravity is small, so that it settles quickly on the grounding pole 3; the larger granularity of the ore is opposite, so it settles in the lower part, and the rest is between the fine and coarse particles, such as the lateral position. Divided, the closer to the center position, the coarser the grain size, the farther the grain size is. According to the settlement height, the finer the upper particle size, the thicker the lowermost layer. Figure 3 is a chamber type industrial electric classifier.
Figure 2 Â Chamber grading schematic
1. Give the mine bucket; 2. Charge the electrode; 3. Ground the pole (louver type); 4. Collect the box (ground)
Figure 3 Â Chamber type industrial electric classifier
1. Roller feeder; 2. Corona pole; 3. Grounding pole; 4, 5. Mine bucket; 6. Belt conveyor
In addition to the above-mentioned grading equipment , there is also a frictional adhesion grading apparatus which can classify materials having a small particle size (0.04 mm), the principle of which is the same as that of the above-mentioned drum type.
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