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PTMS magnetic separation

what is magnetic separation in Feldspar？

The permanent magnet roller is divided into fixed type and rotary type. The fixed type is mainly suitable for weak magnetic field wet sorting of fine magnetic particles or removal of strong magnetic minerals in non-magnetic minerals. When the slurry flows into the magnetic field, the ferromagnetic minerals are Adsorbed on the surface of the cylinder, the weak magnetic and non-magnetic minerals are sorted and excluded, and the ferromagnetic mineral adsorbed on the surface of the cylinder is taken out of the magnetic field region as the cylinder rotates. Rotary type is suitable for dry selection of fine-grained (medium-strong) magnetic minerals. Due to the high-speed rotation, the magnetic rolling times of magnetic particles are much higher than that of ordinary magnetic separators. This is significant for the magnetic agglomeration of the broken ring and the improvement of the rich ratio. The effect is that after being sorted, the mineral is separated into two kinds of magnetic materials and non-magnetic materials, which are respectively discharged from the respective discharge ports, and are suitable for rough selection and selection of ore granularity of 0.6-6 mm. The same cylinder can be equipped with three kinds of tanks, that is, the downstream tank has a particle size of ≤6 mm, the counterflow is selected to have a particle size of ≤0.6 mm, and the semi-counterflow tank has a particle size of ≤1 mm. There are many factors affecting the working of the permanent magnet drum. In addition to the bottom box type, magnetic structure and magnetic field characteristics, there are magnetic system declination, working gap, sorting concentration and cylinder speed. If the magnetic system declination is not appropriate, it will obviously affect the sorting index. The so-called magnetic system declination is the angle between the center line of the magnetic system arc surface and the vertical line of the cylinder center. After the magnetic system, the tailings grade is low, but after the large deviation, the grade of the tailings is increased because the concentrate cannot be lifted to the concentrate end. If the magnetic system is ahead of the head, the concentrate will be lifted too high, the sweeping area will be shortened, and the tailings grade will be raised. Therefore, the magnetic system declination should be adjusted to a moderate position. The distance between the cylinder surface of the rough selection zone and the bottom plate of the tank is called the working gap. The size of the working gap will affect the effect of sorting. The gap is large, and the flow rate of the slurry is also large, which is beneficial to increase the treatment volume. However, because the magnetic field strength is lower from the surface of the cylinder, the grade of the tailings is increased and the metal recovery rate is lowered. Conversely, if the working gap is small, increasing the magnetic field force will lower the concentrate grade, but the recovery rate can be higher. If the working gap is too small, the slurry flow rate will be too fast, so that the ore particles can not be sucked to the surface of the cylinder and will be brought to the tailings by the slurry flow, which will cause the tailings grade to rise, and even the tailings will be difficult to discharge. "phenomenon. Therefore, care should be taken to ensure proper working clearance during the installation and maintenance of the magnetic separator. The size of the sorting concentration determines the slurry flow rate of a certain amount of minerals, which affects the sorting time of the ore particles. The concentration is high, the flow rate is slow, the resistance is large, and the gangue is easily mixed in the concentrate to reduce the quality of the concentrate. However, due to the long selection time, it is beneficial to the recovery rate. Conversely, if the separation concentration is low, the concentrate grade can be higher, and the tailing grade will also increase, resulting in a lower recovery rate. The size of the cylinder rotation speed also has an influence on the selection index, and the rotation speed is low and the output is low. The high speed, the centrifugal force of the ore particles is large, the magnetic turnover effect per unit time increases, the concentrate grade and processing capacity are high, and the recovery rate is reduced. In practice, it is important to adjust the blown water of the ore to the rinse water of the concentrate. The blown water is too large, and the pulp flow rate is too fast, which will increase the grade of the tailings. On the contrary, the small amount of blown water will make the ore particles not fully loose and affect the sorting effect, so that the tailings grade will increase and the concentrate grade will decrease.