high gradient magnetic separation

PTMS MAGNETIC SEPARATOR

what is magnetic separation used for？

The magnetic separator is a common equipment for mine beneficiation. It can be used for magnetic mineral sorting, and it can also be used to remove magnetic impurities in metal minerals. The magnetic separation of the magnetic separator is selected according to the difference of the magnetic properties of the mineral particles. In the magnetic separation process, the pre-selection operation is sufficient. If there is a problem in the magnetic separation stage, the recovery rate will also be affected.

So what are the factors that affect the magnetic separation of magnetic separators?

First, the influence of the magnetic separator itself on the magnetic separator itself, its cylinder speed, magnetic system declination, the gap between the barrel and the bottom of the tank, concentrate discharge, etc. will affect the magnetic separation effect of the flotation machine.

1. Magnetic separator barrel speed The volume of the magnetic separator has a great influence on the processing capacity. The higher the cylinder speed, the greater the processing capacity, and the smaller the processing capacity. In general, the magnetic separator has a small diameter, for example, a 600 mm diameter with a rotational speed of 40 r/min; a large diameter with a low rotational speed, such as a Φ750 mm diameter with a rotational speed of 36 r/min. The magnetic separator cylinder speed also has a certain influence on the quality of the concentrate. The magnetic separator with high cylinder rotation speed has little effect on the magnetically small continuous body and gangue, and only plays a large role in the selection of high magnetic ore. Therefore, it will affect the quality of the concentrate; the magnetic separator with low cylinder rotation speed is relatively slow. At this time, the magnetic induction effect will also select the minerals with weak magnetic properties, which will also affect the quality of the concentrate.

2. The magnetic system of the magnetic separator has a general declination. The magnetic separator that is officially produced by the state will be equipped with a magnetic declination indicating device on the shaft head of the transmission. The size of the magnetic system declination is adjusted by turning the nut. If the magnetic system is too large or too small, it will affect the magnetic separation efficiency of the magnetic separator. If the deviation angle is too small, the quality of the concentrate will be affected, so that the mineral particles with small magnetic system have the opportunity to be selected. The deflection angle is too large. The minerals have little chance of sorting for small magnetic minerals. Therefore, the quality of the concentrate will be improved, but the grade of the tailings will be increased, which will reduce the recovery rate. Generally, the magnetic system declination angle commonly used in the factory is 15°~20°. The specific declination of each plant needs to be determined according to the operation requirements. After the adjustment, if the operating conditions and requirements in the production have not changed, try not to change. .

3. The gap between the magnetic separator barrel and the bottom of the groove The size of the gap between the cylinder and the tank is one of the factors affecting the magnetic separation efficiency of the magnetic separator. If the gap is too small (ie, the distance between the skin and the tank is too large) Recently, when the slurry passes, it will not be smooth, affecting the amount of treatment. At the same time, due to the magnetic field strength conference, the strong magnetic and weak magnetic minerals will be selected together, thereby reducing the quality of the concentrate. If the gap is too large, the strength of the minerals that are weaker for the magnetic system will be reduced, although the quality of the concentrate is improved, but the recovery rate is lowered. The working clearance range of the general magnetic separation plant is in the range of 35-60mm, and the specific gap size needs to be determined according to the actual conditions of the plant.

Second, the influence of the concentration of the slurry of the magnetic separator. The concentration of the slurry of the magnetic separator refers to the size of the overflow concentration of the classifier. Generally, the concentration of the slurry is too large, which will cause the concentration of the separation to be too high, and the concentrate particles are easily thinned. The gangue minerals are covered or wrapped, and the sorting is not opened, which seriously affects the quality of the concentrate. If the concentration of the slurry is too small, not only the concentration is too low, but also the flow rate is increased, the sorting time is shortened, and some small magnetic particles that would have been selected to fall into the tailings are reduced, thereby reducing the recovery rate. Generally, the concentration of the slurry to be fed into the magnetic separator is not more than 35%, and it is preferably controlled at about 30%. The adjustment of the slurry concentration needs to be determined according to the specific situation, and the adjustment method can be adjusted by the size of the water blown off by the ore water.

Third, the influence of the magnetic separator on the size of the ore. The size of the magnetic ore feeder is the important factor affecting the magnetic separation effect of the magnetic separator. If the ore size is small, the monomer dissociation is high and can obtain better. Selection indicators. If the ore size is large or coarse, it means that the mineral monomer is not sufficiently dissociated, and some of the gangue is still combined with the magnetic particles. The gangue with magnetic minerals will also be selected, which will reduce the concentrate grade. . In order to improve the magnetic concentrate, when the material is selected, the material to be fed must fully reach the dissociation state of the monomer. For some ore with a coarse grain size, as long as sufficient monomer dissociation is achieved, the coarse particle size does not affect the selection.

Fourth, the impact of high-pressure flushing water spray water High-pressure flushing water is used for unloading, it needs to remove all selected minerals, but the water spray angle is not well controlled or the pressure control is not good, it will also affect the magnetic separation machine magnetic separation effect.

1. If the angle of the water spray pipe is too low, not only the unloading is not complete, but also the magnetic mineral that has been selected will be washed down, resulting in re-selection, which will affect the magnetic separation efficiency and extend the selection time; If the angle of the water spray pipe is too high, the unloading will be incomplete, which will affect the quality. In addition, high angle flushing will cause splashing, affecting hygiene and wasting water resources. The angle of the water spray pipe can be adjusted by slowly adjusting the pipe angle with the pipe wrench until the water spray effect is acceptable.

2. The water pressure of the water spray is generally not less than 0.1 MPa. The pressure below the pressure is not enough to overcome the attraction of the magnetic field to the selected particles. It can not be discharged into the concentrate box with the cylinder rotating in the circle. The above contents have analyzed the influence of magnetic separation machine magnetic separation on the magnetic separator's own conditions, slurry concentration, ore size, high pressure water washing pipe, etc., and proposed corresponding solutions. In practical applications, the influence of efficiency on magnetic separators is far more than these. Therefore, in order to ensure the efficiency of magnetic separation, it is necessary to improve the monitoring and control of the above problems.