The basic principle of electrification: Electrification is a beneficiation method that uses an electric separator to separate minerals based on the difference in electrical properties between minerals.
Mineral electrical properties can be described by dielectric constant, electrical resistance, specific conductivity, and commutability. In general, minerals with a small dielectric constant, large electrical resistance, and high specific conductivity are not easily conductive, and are often produced as non-conducting minerals in electrical selection; in contrast, where the dielectric constant is large and the resistance is large Smaller, less conductive minerals tend to be more conductive and are often produced as conductor minerals in electrical elections.
Mineral electrical differences are the internal cause of electrification, and to separate them, it is necessary to create appropriate external conditions. The electric separator provides an appropriate electric field, plus a gravitational field and a centrifugal force field. Thus, in the electrification process, the electric field force, gravity, centrifugal force, and friction force act together on the ore particles, and the combined force of these forces determines the direction of the ore particles. To achieve electrical separation, the following conditions must be met:
The electric field force of the non-conducting ore particles > the combined force of the gravity and centrifugal force of the ore particles > the electric field force of the conductor ore.
The magnitude of the electric field force received by the ore particles is related to the amount of electricity carried by the ore particles. Because of its good conductivity, the conductor ore is easy to discharge during the electrode contact process. Even if it starts to get a lot of charge, only a small amount of charge will be left, and the electric field force it receives is very small. The right condition is easy to satisfy. In order to satisfy the conditions on the left side of the inequality, it is necessary to increase the electric field force to which the non-conductor ore particles are subjected. The composite electric field of the electrostatic field and the corona electric field allows the non-conducting ore particles to carry more electricity. At the same time, in order to increase the electric field strength, a high voltage is used, so that the non-conductor ore particles are subjected to a large electric field force, and the competitiveness such as gravity and centrifugal force can be overcome to achieve electrical separation.
A commonly used electric selection device is a drum type electric sorter. The electrification process and principle is that when the high voltage DC negative current is passed to the corona pole and the static electrode, since the corona pole diameter is small, a high electric field strength is formed in the vicinity thereof, so that the corona pole emits a large amount of high speed in the direction of the drum. Moving electrons, these electrons collide with air molecules to ionize them, positive ions fly to the negative pole, and negative ions fly toward the drum to produce corona discharge. Thus, the space near one side of the drum is negatively charged, and the static electrode produces only a high voltage electrostatic field without discharging.
The ore particles are uniformly fed to the surface of the drum through the vibrating trough and then enter the electric field. At the beginning, both the conductor and the non-conducting ore are adsorbed with negative charges, and the conductor ore quickly transports the negative charge through the drum. At the same time, it is induced by the high-voltage electrostatic field. One end near the electrostatic field induces positive electricity, and one end near the drum induces negative electricity. The negative electricity is quickly transmitted by the drum. Finally, only positive charge is left, and the high-voltage negative electrode is Attraction, coupled with the gravity and centrifugal force of the ore itself, causes it to fall off the drum and become a conductor product; the negative charge obtained by the non-conducting ore particles is difficult to pass away, and is attracted by the drum and adheres to the surface of the drum. As the drum rotates to the back of the electric field, the brush becomes a non-conductor product; the medium-conducting particles fall into the middle ore in the middle.
The optimum material size of the drum type electric separator is 0.1-1mm. The selected material needs to be dried because the water will reduce or disappear the electrical difference between the conductor and the non-conducting ore. The nature of the selected materials is different, and the electrification conditions should also change accordingly. Therefore, in actual production, the voltage, motor position, drum speed and the position of the distribution plate should be adjusted at any time.
The selected process is to further discard the tailings from the coarse concentrate with a shaker, and then separately obtain a single mineral product by magnetic separation, flotation, electric selection and re-election.
Features:
1. Using high-performance servo motor to yarn guide, make the linear velocity reach over 800m/min, even reach 1800m/min, production efficiency will multiplied and reduce cost.
2. All-round intelligent control technology instead of mechanical structure, let machine performance reach the international advanced level, it's easy and convenient for operation.
3. Intelligent tension device, active unwinding device, automatic tracking overfeeding system, assure stabilization of shaping.
4. Yarn breaking device and length count device, use encoder to detect and control speed, promise the yarn produce consistency.
5. Using brushless motor driving, adjusting forming length and trimming angle intelligently, soft edge density is controllable, ensure yarn forming density uniformity.
Technical Parameter:
| Number of spindle | 60 spindles |
| Spindle gauge | 360 mm |
| Linear velocity | 200-1800m/min |
| Tension | electronic tension with clamp tension |
| Traverse | 130 mm-260 mm |
| Slide angle | 0º-60º |
| Rated power | 400 W |
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