Magnetic separation equipment and silicon powder demagnetization system

Abstract

The utility model provides magnetic separation equipment and a silicon powder demagnetization system, and relates to the technical field of polycrystalline silicon production. The magnetic separation equipment comprises a first vibration material conveying machine; the first strong magnetic roller is arranged close to an outlet of the first vibration conveyor; an inlet of the second vibration material conveying machine is arranged below one side of the first strong magnetic roller; the second strong magnetic roller is arranged close to an outlet of the second vibration conveyor; and the magnetic plate is arranged at an outlet of the magnetic separation equipment. The silicon powder demagnetization system comprises the magnetic separation equipment and a stock bin for supplying silicon powder to the magnetic separation equipment. According to the utility model, a direct contact mode is adopted to adsorb and separate magnetic substances in silicon powder, and particularly, a good adsorption effect can also be achieved on micron-sized magnetic substances. The traditional belt conveying mode is replaced by the vibration conveying mode, the silicon powder can be prevented from being carried by the belt, the silicon powder waste is reduced, the belt does not need to be replaced, and the maintenance difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of polysilicon production, in particular to a magnetic separation device and a silicon powder demagnetization system. Background Art

[0002] In the production of polysilicon, a large amount of broken materials and powders are inevitably produced, of which 1-3mm powders account for about 2%, and powders less than 1mm account for about 2.5%. Since the powder (silicon powder) contains a large amount of magnetic substances (mostly metal substances), it is very easy to cause quality problems in the process of pulling single crystals. In particular, the silicon material industry has extremely strict requirements and control on the content of metal impurities, so a large amount of powder is downgraded.

[0003] In the past, in order to improve the quality of silicon powder, reduce the content of magnetic substances in silicon powder, increase the utilization rate of silicon powder, reduce production costs and improve efficiency, the mode of indirect contact between magnetic separation equipment and silicon powder was adopted. That is, the existing magnetic separation equipment drives the magnetic roller through the motor, and then drives the belt to convey the silicon powder through the magnetic roller. The magnetic roller is in indirect contact with the silicon powder. This method has the following technical problems:

[0004] 1. It can play a certain role in separating materials with large volume and strong magnetic attraction, but it has little effect on separating materials with micron-level magnetic properties (low magnetism).

[0005] 2. The existing magnetic separation equipment uses belts to transport silicon materials, which is easy to carry powder materials, resulting in serious waste of silicon powder.

[0006] 3. When replacing the belt of the existing magnetic separation equipment, the equipment must be dismantled for replacement, and the maintenance efficiency is extremely low. Utility Model Content

[0007] In view of the above situation, the utility model provides a magnetic separation device and a silicon powder demagnetization system, aiming at solving the technical problems pointed out in the above background technology.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] In a first aspect, the utility model provides a magnetic separation device, including:

[0010] First vibrating conveyor;

[0011] A first strong magnetic roller is disposed near the outlet of the first vibrating conveyor;

[0012] A second vibrating conveyor, the inlet of which is arranged below one side of the first strong magnetic roller;

[0013] A second strong magnetic roller is disposed near the outlet of the second vibrating conveyor;

[0014] The magnetic plate is arranged at the outlet of the magnetic separation device.

[0015] In some embodiments of the present invention, a first magnetic scraper is provided on one side of the first strong magnetic roller.

[0016] In some embodiments of the present invention, a first magnetic receiving box is disposed below the first magnetic scraper.

[0017] In some embodiments of the present invention, a second magnetic scraper is provided on one side of the second strong magnetic roller.

[0018] In some embodiments of the present invention, a second magnetic receiving box is disposed below the second magnetic scraper.

[0019] In some embodiments of the present invention, the first vibrating conveyor, the first strong magnetic roller, the second vibrating conveyor, the second strong magnetic roller and the magnetic plate are all integrated in a housing.

[0020] In some embodiments of the present invention, a flaring door is provided on the shell, and the flaring door is arranged close to the magnetic plate.

[0021] In a second aspect, the utility model provides a silicon powder demagnetization system, which includes the above-mentioned magnetic separation equipment and a silo for supplying silicon powder to the magnetic separation equipment.

[0022] In some embodiments of the present invention, an elevator is further included; the inlet of the elevator is connected to the outlet of the silo, and the outlet is connected to the inlet of the first vibrating feeder.

[0023] In some embodiments of the present invention, a feeding strong magnetic roller is arranged between the outlet of the silo and the inlet of the elevator.

[0024] The embodiments of the present invention have at least the following advantages or beneficial effects:

[0025] 1. Direct contact is used to adsorb and separate magnetic substances in silicon powder, especially for micron-sized magnetic substances, which can also have a good adsorption effect.

[0026] Second, demagnetization treatment is carried out at the inlet of the first vibrating conveyor, the outlet of the first vibrating conveyor and the outlet of the magnetic separation equipment, which can completely adsorb and separate the magnetic substances in the silicon powder.

[0027] 3. The vibration feeding method is used instead of the traditional belt conveyor, which can avoid the belt from carrying silicon powder, reduce the waste of silicon powder, and there is no need to replace the belt, thereby reducing the difficulty of maintenance.

[0028] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of the silicon powder demagnetization system;

[0031] Figure 2 It is a structural schematic diagram of one side of the silicon powder demagnetization system;

[0032] Figure 3 It is used to show part of the internal structure of the silicon powder demagnetization system;

[0033] Figure 4 for Figure 3 A partial enlarged view of position A in the middle;

[0034] Figure 5 for Figure 3 A partial enlarged view of position B in the middle;

[0035] Figure 6 for Figure 3 A partial enlarged view of the C position in the middle.

[0036] icon:

[0037] 1- material bin, 11- feeding strong magnetic roller, 12- feeding magnetic scraper,

[0038] 2- Hoist,

[0039] 3-magnetic separation equipment, 31-first vibrating conveyor, 32-first strong magnetic roller, 33-second vibrating conveyor, 34-second strong magnetic roller, 35-magnetic plate, 36-first magnetic scraper, 37-first magnetic receiving box, 38-second magnetic scraper, 39-second magnetic receiving box, 41-shell, 42-expansion door, 43-first inspection door, 44-second inspection door, 45-export of magnetic separation equipment. DETAILED DESCRIPTION

[0040] In the following, only some exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention.

[0041] In the description of the embodiments of the present invention, it needs to be understood that the terms "upper" and "lower" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0043] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0044] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0045] Example

[0046] See also Figure 1 to Figure 6 This embodiment provides a silicon powder demagnetization system, including a silo 1, a hoist 2 and a magnetic separation device 3 connected in sequence.

[0047] The silo 1 is arranged at the feeding end of the silicon powder demagnetization system, and is used to supply silicon powder to the magnetic separation device 3 .

[0048] The entrance of the elevator 2 is located below the exit of the silo 1, and the exit of the elevator 2 is located above the entrance of the magnetic separation device 3; the entrance of the elevator 2 is connected to the exit of the silo 1, and the exit is connected to the entrance of the magnetic separation device 3 (i.e., the entrance of the first vibrating feeder 31 described below).

[0049] A feeding strong magnetic roller 11 and a feeding magnetic scraper 12 are arranged between the outlet of the silo 1 and the inlet of the elevator 2 .

[0050] The feeding strong magnetic roller 11 is driven by a motor to rotate, and the silicon powder discharged from the outlet of the silo 1 can pass through one side surface of the feeding strong magnetic roller 11, so that the magnetic substances in the silicon powder are adsorbed by direct contact between the silicon powder and the feeding strong magnetic roller 11.

[0051] The in-feed magnetic scraper 12 is arranged on one side of the in-feed strong magnetic roller 11 and is used to scrape off the magnetic material attached to the in-feed strong magnetic roller 11 .

[0052] The magnetic separation device 3 includes a first vibrating conveyor 31 , a first strong magnetic roller 32 , a second vibrating conveyor 33 , a second strong magnetic roller 34 and a magnetic plate 35 .

[0053] The first vibrating conveyor 31 is disposed below the outlet of the elevator 2 , and the inlet of the first vibrating conveyor 31 is connected to the outlet of the elevator 2 .

[0054] The first strong magnetic roller 32 is driven by a motor to rotate, and the first strong magnetic roller 32 is arranged close to the outlet of the first vibrating feeder 31; the silicon powder discharged from the outlet of the first vibrating feeder 31 can pass through the side surface of the first strong magnetic roller 32, so that the magnetic substance in the silicon powder is adsorbed by direct contact between the silicon powder and the first strong magnetic roller 32.

[0055] A first magnetic scraper 36 is disposed on one side of the first strong magnetic roller 32 for scraping off magnetic substances attached to the first strong magnetic roller 32 .

[0056] A first magnetic material receiving box 37 is disposed below the first magnetic material scraper 36 . The first magnetic material receiving box 37 is used to collect the magnetic material scraped off from the first strong magnetic roller 32 .

[0057] The inlet of the second vibrating conveyor 33 is arranged below one side of the first strong magnetic roller 32 .

[0058] The second strong magnetic roller 34 is driven by a motor to rotate. The second strong magnetic roller 34 is arranged close to the outlet of the second vibrating feeder 33. The silicon powder discharged from the outlet of the second vibrating feeder 33 can pass through one side surface of the second strong magnetic roller 34, so that the magnetic substance in the silicon powder is adsorbed by direct contact between the silicon powder and the second strong magnetic roller 34.

[0059] A second magnetic scraper 38 is disposed on one side of the second strong magnetic roller 34 for scraping off magnetic substances attached to the second strong magnetic roller 34 .

[0060] A second magnetic receiving box 39 is disposed below the second magnetic scraper 38 . The second magnetic receiving box 39 is used to collect the magnetic material scraped off from the second strong magnetic roller 34 .

[0061] The magnetic plate 35 is arranged at the outlet 45 of the magnetic separation equipment, and the second strong magnetic roller 34 is located between the outlet of the second vibrating conveyor 33 and the magnetic plate 35, and the magnetic plate 35 can directly contact the silicon powder; the magnetic plate 35 is arranged at the discharge end of the silicon powder demagnetization system as the final demagnetization means of this device.

[0062] The reason why the present embodiment uses the magnetic plate 35 instead of the magnetic roller at the outlet 45 of the magnetic separation device is that the outlet 45 of the magnetic separation device serves as the discharge end of the device, and it is very convenient to clean the adsorbed magnetic material here (without the need to use self-rotation to clean itself), which helps to reduce the manufacturing cost of the equipment and the power consumption during operation.

[0063] In this embodiment, the first vibrating feeder 31, the first strong magnetic roller 32, the second vibrating feeder 33, the second strong magnetic roller 34 and the magnetic plate 35 are all integrated in the housing 41. In other embodiments, the housing 41 may not be provided, as long as the above components can be combined together. As for how these components are fixed and installed, there is no limitation here, and those skilled in the art can select a suitable method as needed.

[0064] The first magnetic connection box 37 and the second magnetic connection box 39 are both detachably connected to the housing 41 , so as to restore the effective volumes of the first magnetic connection box 37 and the second magnetic connection box 39 in time.

[0065] The shell 41 is provided with an expansion door 42 , and the expansion door 42 is arranged close to the magnetic plate 35 , so that when cleaning the magnetic plate 35 , opening the expansion door 42 can provide a larger operating space.

[0066] In order to facilitate the maintenance of the first strong magnetic roller 32, a first inspection door 43 is provided on the shell 41, that is, the position of the first inspection door 43 corresponds to the position of the first strong magnetic roller 32; in order to facilitate the maintenance of the second strong magnetic roller 34, a second inspection door 44 is provided on the shell 41, that is, the position of the second inspection door 44 corresponds to the position of the second strong magnetic roller 34.

[0067] The working principle of the above silicon powder demagnetization system is:

[0068] After the silicon powder from the silo 1 passes through the surface of the feeding strong magnetic roller 11 to separate the magnetic material, it enters the first vibrating conveyor 31 to pass through the surface of the first strong magnetic roller 32 to separate the magnetic material, then enters the second vibrating conveyor 33 to pass through the surface of the second strong magnetic roller 34 to separate the magnetic material, and finally passes through the surface of the magnetic plate 35 to completely separate the magnetic material in the silicon powder.

[0069] In combination with the above content, this embodiment has at least the following beneficial effects:

[0070] 1. Compared with the indirect contact adsorption method, this embodiment uses a direct contact method to adsorb and separate the magnetic substances in the silicon powder, especially for micron-sized magnetic substances, and can also have a good adsorption effect.

[0071] Second, demagnetization treatment is performed at the outlet of the silo 1, the outlet of the elevator 2 (or the inlet of the first vibrating feeder 31), the outlet of the first vibrating feeder 31, and the outlet 45 of the magnetic separation device. That is, the present embodiment preferably adopts four-level demagnetization to completely absorb and separate the magnetic substances in the silicon powder. In other embodiments, demagnetization treatment can also be performed only at the outlet of the elevator 2 (or the inlet of the first vibrating feeder 31), the outlet of the first vibrating feeder 31, and the outlet 45 of the magnetic separation device. That is, three-level demagnetization treatment can also completely absorb and separate the magnetic substances in the silicon powder.

[0072] 3. For the magnetic separation equipment 3, this embodiment uses a vibrating feeding method instead of the traditional belt conveyor, which can avoid the belt from entraining silicon powder, reduce silicon powder waste, and there is no need to replace the belt, thereby reducing the difficulty of maintenance.

[0073] Fourth, by providing the first magnetic scraper 36 and the second magnetic scraper 38, the surfaces of the first strong magnetic roller 32 and the second strong magnetic roller 34 can be cleaned in time, thereby ensuring the adsorption effect of the magnetic substances in the subsequent silicon powder.

[0074] 5. The shell 41 can not only provide protection and support for other components, but also effectively prevent silicon powder from escaping during movement.

[0075] 6. The shell 41 is provided with an expansion door 42 , which is arranged close to the magnetic plate 35 . Thus, when cleaning the magnetic plate 35 , opening the expansion door 42 can provide a larger operating space.

[0076] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. In the absence of conflicts, the embodiments of the present application and the features in the embodiments may be combined with each other at will. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnetic separation device, It is characterized in that Including the following for silicon powder to pass through in sequence: First vibrating conveyor; A first strong magnetic roller is disposed near the outlet of the first vibrating conveyor; A second vibrating conveyor, the inlet of which is arranged below one side of the first strong magnetic roller; A second strong magnetic roller is disposed near the outlet of the second vibrating conveyor; The magnetic plate is arranged at the outlet of the magnetic separation device.

2. The magnetic separation device according to claim 1, It is characterized in that A first magnetic scraper is arranged on one side of the first strong magnetic roller.

3. The magnetic separation device according to claim 2, It is characterized in that A first magnetic receiving box is arranged below the first magnetic scraper.

4. The magnetic separation device according to claim 1, It is characterized in that A second magnetic scraper is arranged on one side of the second strong magnetic roller.

5. The magnetic separation device according to claim 4, It is characterized in that A second magnetic receiving box is arranged below the second magnetic scraper.

6. The magnetic separation device according to any one of claims 1 to 5, It is characterized in that The first vibrating conveyor, the first strong magnetic roller, the second vibrating conveyor, the second strong magnetic roller and the magnetic plate are all integrated in a housing.

7. The magnetic separation device according to claim 6, It is characterized in that The shell body is provided with a flaring door, and the flaring door is arranged close to the magnetic plate.

8. A silicon powder demagnetization system, It is characterized in that It comprises the magnetic separation equipment as described in any one of claims 1 to 7, and a silo for supplying silicon powder to the magnetic separation equipment.

9. The silicon powder demagnetization system according to claim 8, It is characterized in that It also includes an elevator; the inlet of the elevator is connected to the outlet of the silo, and the outlet is connected to the inlet of the first vibrating feeder.

10. The silicon powder demagnetization system according to claim 9, It is characterized in that A feeding strong magnetic roller is arranged between the outlet of the silo and the inlet of the elevator.

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