There are many factors affecting the magnetic separation effect. As for the magnetic separator itself, there are the following points:
1) The number of revolutions of the magnetic separator barrel;
2) magnetic system declination;
3) working gap (ie the gap between the cylinder and the bottom of the tank);
4) Clearance at the concentrate.
2. What effect does the number of revolutions of the magnetic separator have on the magnetic separation effect?
Generally speaking, the diameter of the magnetic separator is small, and a high number of revolutions is used, for example, Φ600 mm diameter is 40 rpm, and a large diameter is used, for example, Φ750 mm diameter is 35 rpm.
The size of the magnetic separator has a large influence on the processing capacity. The number of revolutions is high, the processing capacity is high, and the number of revolutions is low.
It has a certain impact on the quality of concentrate. In the operation of the magnetic separator with high number of revolutions, because of the relatively fast speed, there are fewer opportunities for the magnetic body and the gangue to come up. Only the mineral particles with higher magnetic properties may be selected, so the quality of the concentrate is Higher. On the contrary, the number of revolutions is low and the speed is relatively slow. Due to the magnetic induction, the magnetic particles with weak magnetic properties also have the opportunity to be selected, resulting in the quality of the concentrate being affected.
Therefore, according to the characteristics of the ore and the requirements of the index, it is necessary to select the appropriate number of magnetic separators.
3. What effect does the magnetic declination have on the magnetic separation effect?
The magnetic separator which is officially produced by the state is equipped with a magnetic declination indicating device on the shaft head on the transmission side, and the adjustment angle of the magnetic system can be adjusted by moving the adjusting nut.
If the angle of the magnetic declination is too large or too small, the quality of the concentrate will be too small, so that the particles with smaller magnetic properties have the opportunity to be selected, but the grade of the tailings will be lowered, which is good for the recovery rate; the angle is too large. It is good for improving the quality of concentrates, because only the particles with large magnetic properties have the opportunity to be selected. If the magnetic properties are small, there is no chance to come up to the tailings, which will increase the tailings grade and reduce the recovery rate.
Therefore, the size of the magnetic declination must be adjusted according to the operation requirements. Generally, the magnetic declination of the production site is adjusted to be around 15°-20°. Adjust the magnetic system yaw angle. If there are no changes in the operating conditions and requirements during production, do not move easily.
4. What effect does the size of the working gap of the magnetic separator have on the magnetic separation effect?
The working gap of the so-called magnetic separator is the distance between the cylinder and the tank. The size of this spacing is one of the factors that affect the quality of the concentrate.
The gap is too small, that is, the distance between the barrel and the tank is too close. When the slurry passes, not only does it not affect the throughput, but because the spacing is too small, the particles of any magnetic size will have a sufficient chance to be sucked onto the barrel. Mainly due to the fact that the pulp is too close to the magnetic field and the magnetic field strength is high. However, it is beneficial to reduce the tailings grade and improve the recovery rate.
If the spacing is too large, only the particles with stronger magnetic properties can be selected, and the weaker ones cannot be selected. Although the grade of the concentrate is improved, the grade of the tailings is also increased, and the recovery rate is lowered.
Therefore, it is very important to adjust the working gap. In the field production, the working gap is generally adjusted within the range of 35-60 mm according to the needs, and the working gap can be adjusted to change the gap size by the gasket under the bracket angle steel.
5. What is the effect of the water spray angle and pressure on the magnetic separation effect?
The main operating factors of the wet permanent magnet magnetic separator are the adjustment of the high pressure flushing water and the blown water for the mine. We know that the blown water is too large for the mine, the slurry flow rate is increased, and the short tailings are lost during the sorting time; the blown water is too small, the pulp cannot be fully stirred, and the ore pellets affect the quality of the concentrate.
High-pressure flushing water is mainly used for unloading. It should remove all selected magnetic minerals. However, often due to poor water spray angle or excessive pressure, the magnetic separation effect will be adversely affected. If the angle of the spray water is too low, not only the incomplete discharge will cause the selected magnetic particles to be washed down again, resulting in re-selection. If the water spray angle is too high, it will also unload the selected concentrate, which will affect the quality. At the same time, the splash will affect the civilized health.
Therefore, the high-pressure flushing water spray angle must be adjusted. You can adjust the angle of the water pipe slowly by using the pipe wrench until the water spray effect is satisfactory. The pressure of water should not be lower than 1 kg/cm2. If it is lower than this pressure, it is not enough to overcome the attraction of the magnetic field to the selected particles, so that a considerable part of the magnetic particles will still be out of the situation with the cylinder rotating around. Excessive pressure is pure waste.
6. What effect does the gap size of the magnetic separation machine cylinder and the discharge concentrate have on the magnetic separation effect?
The size of the gap between the cylinder and the concentrate is mainly related to the yield of God. Here, the gap is too small, which affects the discharge of the concentrate that has been selected. The excessive clearance also affects the discharge of the selected concentrate. At the same time, due to the long residence time of the concentrate in the tank, it is inevitable that the tailings loss and the quality of the concentrate will be reduced, and at the same time, the productivity will be affected.
Therefore, the gap at the concentrate should not be too large or too small, and it should be adjusted by careful observation. The adjustment range is preferably 15-20 mm as required.
The gap size of the discharge port can be changed by moving the groove body back and forth.
7. What effect does the concentration of slurry have on the magnetic separation effect?
The slurry concentration mainly refers to the overflow concentration of the classifier. If the concentration of the slurry is too large, resulting in too high a sorting concentration, the quality of the concentrate will be seriously affected. Because the concentrate particles are easily covered by finer gangue particles and the package is not opened at this time, they are selected together to lower the grade. If the concentration of the slurry is too small, the concentration will be too low, and the flow rate will increase. The selection time will be shortened, so that some small magnetic particles that would have been available should fall into the tailings to increase the grade of the tailings and cause losses.
Therefore, the pulp concentration should be adjusted as needed. The adjustment at the magnetic separator is mainly adjusted by the size of the blown water for the mine. However, the most important thing is that the graded overflow concentration must be completed according to the magnetic separation requirements. The maximum concentration of the feed slurry should not exceed 35%, and the control is generally about 30%, which should be determined according to the time.
8. What effect does the grinding grain size have on the magnetic separation effect?
The most important factor affecting the magnetic effect of the magnetic separator is the feed size of the magnetic input.
The thickness of the ore-bearing grain size indicates the degree of separation of the ore monomer, that is, the degree of separation of the magnetic ore particles from the gangue particles.
If the ore particle size is small, it means that the mineral monomer has high separation degree and can obtain satisfactory selection index; if the ore particle size is relatively coarse, it means that the mineral is not fully dissociated, the monomer separation degree is not high, and the opposite body is more That is, the magnetic particles and the gangue still have a considerable portion combined. Since the continuous body is also quite magnetic, a considerable part of the selection can be selected to reduce the concentrate grade.
Therefore, it is required that the minerals to be fed into the magnetic separator must sufficiently reach the monomer dissociation. For the ore with a coarse grain size, as long as the mineral and the gangue have reached the monomer separation, the particle size is not necessarily too fine. Such ore sometimes has a coarser grain size, but the quality of the selection is not low. The main reason is that the ore is coarsely grained, and the useful mineral and the gangue are separated to some extent.
Medium Speed Can Sealing Machine
Medium Speed Can Sealing Machine,Sauce Plastic Jar Foil Sealing Machine,Automatic Aluminium Foil Sealing Machine,Aluminum Tin Can Seamer Machine
Guangdong Xtime Packaging Equipment Co., Ltd. , https://www.xtimepackaging.com