There are many factors affecting electrification, but they can be summarized as two aspects: one is the various factors of the electric separator itself; the other is the requirement for materials.
First, the voltage
The voltage of the electrical selection is very important and directly affects the electrification effect. In the past, the voltages used in countries around the world were mostly around 20 kV. From the theory and the actual, it was concluded that increasing the voltage is good for the sorting effect. The charge obtained by the ore particles is directly related to the field strength. The higher the voltage, the greater the field strength. The more electrons escape from the corona, the more favorable the sorting, but the higher the voltage, the better. The sorting voltage required for a particular mineral is also different. When the voltage is too low in the experiment also proved that some minerals such as niobium tantalum is less than 5 kV / cm, an effective separation impossible or difficult; but high voltage conductor will affect the recovery of mineral.
Second, the electrode structure and its position relative to the drum
The electrode structure refers to the number of corona poles, the size of the position and the polarization, and the like. The recovery rate of a single corona pole and a partial pole dressing is relatively high, but the concentrate grade is low and the sorting efficiency is very low. There are too many coronas, which are only good for improving the concentrate grade, but it is not good for improving the recovery rate of the conductor. The relative position of the corona pole and the drum is about 45°.
The pole distance is also an important factor in the selection of electricity. The voltage required for the small pole moment is low, but it is difficult to achieve in production because it is easy to cause spark discharge and affect the beneficiation effect. With a polar moment of 60 to 80 mm, it is not easy to cause spark discharge at a very high voltage, and it can ensure the beneficiation effect.
Third, the drum speed
The drum speed is also one of the important factors affecting the electrification effect. This is essentially a matter of time when the candidate material passes through the electric field. It must be pointed out that the time of the material passing through the electric field should be close to 0.1 second to ensure that the material can obtain sufficient charge, otherwise the sorting efficiency will be reduced. The speed is also directly related to the particle size of the candidate material.
The material has a large particle size and requires a slow rotation speed; the particle size is fine and the rotation speed is required to be fast. This is because the coarse particle size obtains more electric charge through the electric field at a slow rotation speed, and can generate a larger specular suction force for the non-conductor. Therefore, it is not easy to drop the conductor into the ore tank. If the rotation speed is too large, the centrifugal force of the conductor or the non-conducting ore will increase, causing the non-conducting ore particles to leave the drum surface prematurely and be mixed in the conductor product.
The lower the rotational speed, the higher the conductor grade, and the non-conductor is rarely mixed in the conductor. Conversely, at high speeds, the lower the conductor grade, the lower the non-conductor is easily mixed in the conductor, and the non-conductor grade is high.
The speed should be different depending on the job requirements. When the conductor product is concentrate, the sweeping operation should use high speed to ensure the recovery rate of the conductor as much as possible. In order to ensure the conductor grade during the selected operation, low speed should be used.
Fourth, the location of the mining board
The location of the separation plate also directly affects the quality and quantity of the concentrate. Therefore, the appropriate location should be selected according to the job requirements. If the non-conductor ore is required to be very pure, the second sub-salt plate under the drum should be tilted to the left to return the middle mine to re-election; otherwise, if the conductor (concentrate) is very pure, the first sub-mine The plate is tilted as far as possible to the right to re-select the middle mine.
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