Fine-grain electrification is an important issue that has attracted attention and research at home and abroad. Especially fine-grained materials of less than 0.1 mm have made remarkable progress after research by scholars all over the world. One is dry electrification and the other is wet. The configuration of the electric sorter is a nearly elliptical closed loop, and the cut surface of the tube is rectangular, and FIG. 1 is a schematic diagram of its configuration. In the figure, hot air is sent at one place, material is fed at three places, and 2 is a regulating valve. The material flows along the pipeline along with the hot air. A corona pole is installed at the pipeline 4, and 5 is a grounding pole. The fine-grained material entering the pipeline is charged in the BC section. Regardless of whether the conductor or non-conductor ore particles obtain electric charge in the corona field, the electric charge adsorbed by the conductor ore particles is immediately transmitted through the grounding pole 6 due to different electrical properties, and is carried away with the airflow and discharged from the discharge hole 9; Conductor ore can not immediately transfer the charge, adsorbed inside the pipe wall, and is driven by the airflow to 8 places. The middle mine between the two is sorted by air circulation. The electrode size (referring to the length of BC and CD) can also vary depending on the time required to charge and transform the selected mineral. Where F———electricity, N; Where ε 1 — the dielectric constant of the first dielectric liquid; After the feedstock is fed from the upper part of the drum to the drumhead, it is driven by the drum to the dielectric liquid. At this time, the ore enters the electric field action zone formed between the sieve and the drum, and the dielectric is affected by the non-uniform electric field. The constant large dry liquid of the ore is sucked on the drum, while the dielectric constant is lower than the liquid but is repelled and falls to the left through the sieve hole. The ore particles sucked on the drum filament rotate with the drum. Near the critical position of the partition plate leaving the sieve plate, it falls into the groove on the right side, because the field strength at this point becomes small, and it is affected by liquid resistance and gravity, so it can be discharged. We are specized in SKH51/SKD61 and APS 23 material Valve Pin,SKH51/SKD61 and APS 23 material Valve Bush for Hot Runner System Parts.With Imported raw materials, most precision, excellent coating options, Advanced hole polishing technology. sliding fit is available for all valve pins and bushes with the same size. Experienced turning technology for all kinds of materials for nozzle parts, guarantee your desired specification. Valve Pin,Valve Bush,Pump Shaft Valve Pin,Hot Runner Valve Pin Changsha Borun Mould Co. Ltd. , http://www.borunmouldparts.com
(1) Dry-type rotary electric separator 
If such an electric sorter is used to sort the minerals charged by friction, it is not necessary to install the corona pole 4, but the ore particles are rubbed against the pipe wall, and other materials are lined in the pipe wall to facilitate the charging of the ore particles. Simply install a static electrode at 6, 7 and sort the two minerals with positive and negative charges. The voltage used can reach 50 kV, and the sorting granularity is less than 5 micrometers. The sorting effect is better, and it has not yet formed a series of production products.
(2) Warm Dielectric Sorting Machine This sorting of electric sorting machines is carried out in a dielectric liquid, which is different from the various thousand sorting described above. The principle is to use the dielectric ore particles to polarize in a non-uniform electric field to produce different motions. When the dielectric constant of the sorted solid particles is less than the dielectric constant of the dielectric liquid, the electric field generates a repulsive force to the particles, and conversely, when the dielectric constant of the liquid is greater than the dielectric constant of the liquid, a suction force is generated.
According to the theoretical formula, the generated electricity (also known as the mass power) is:
ε m , ε L — the dielectric constant of minerals and dielectric liquids;
When r 3 , E and gradE in the formula (1) are constant, then F is only related to ε m and ε L .
When ε m > ε L , the F>0 electrode attracts the ore particles;
When ε m < ε L , F < 0, the electrode repels the ore. And when ε L =0.365 ε m , F reaches the limit value (this is based on the actual measurement).
Since this sorting is a non-uniform electric field and is carried out in a liquid, the movement of fine-grained ore in the medium is necessarily related to dielectrophoretic force, electrostatic force, diffusion or osmotic pressure, gravity and viscous drag, etc., but since this is a Seed group movement, and these forces are not yet available for measurement and calculation, so only the effect of electricity is considered. [next]
Using a mixture of a liquid dielectric constant of carbon tetrachloride and methanol, also using a mixture of kerosene and nitrobenzene, as needed formulated liquids of different dielectric permittivity. The average value can be obtained by the following formula.
ε 2 — The dielectric constant of the second dielectric liquid.
If the required ε L value is larger or smaller than the average of the two, the amount of the first dielectric liquid can be appropriately increased or decreased to adjust the appropriate ε L value.
The power source of this type of electric separator is different from the general electric sorter, but uses an AC power source of 2 to 5 kV, or a DC power source.
A3 Drum-type dielectric sorting machine This is a dielectric sorting machine developed in the United States. A lot of filaments are installed on the drum, and the corresponding one is a sieve mesh. After being energized, it is in the drum and sieve. A non-uniform electric field is formed between the plates, and 2/3 of the drum is immersed in the dielectric liquid, and its structure is as shown in FIG.
According to the US Bureau of Mines, the sorting of 28 complex mines shows that the effect is very good, but the production capacity is very low, which is its outstanding weakness.