Granular silicon separating device

Abstract

The utility model discloses a granular silicon separation device in the field of separation equipment. The granular silicon separation device comprises a conveying assembly which is obliquely arranged; the storage tank is arranged above the conveying assembly and is used for conveying the mixture; wherein a first collecting part and a second collecting part are arranged on the high side and the low side of the conveying assembly respectively, and when the conveying assembly operates, corresponding collection of the first collecting part and the second collecting part is achieved according to the shape of a mixture; the inclined conveying assembly is designed, when crystalline silicon in a storage tank is discharged onto the conveying assembly during use, square-like or rectangular polycrystalline silicon and the conveying assembly are large in contact area and large in friction force, granular silicon (approximately spherical) and the conveying assembly are small in contact area and small in friction force, and the square or rectangular polycrystalline silicon can move along with the conveying assembly; and the granular silicon slides down along the inclined gradient, so that the two types of silicon can be quickly and effectively separated.

Description

Technical Field

[0001] This application relates to the field of separation equipment technology, specifically to a granular silicon separation device. Background Technology

[0002] Granular silicon is produced using a fluidized bed process. In this process, silane gas enters the fluidized bed and is heated to 600℃-1000℃, where it decomposes into silicon and hydrogen. The silicon accumulates on the seed crystals, growing into particles of a certain size, which are then collected in a product collector for sale. Alternatively, after the silane gas decomposes at 600℃-1000℃, the silicon accumulates on the seed crystals, growing into particles of a certain size, which are then collected in a product collection tank. Granular silicon products are approximately spherical. However, during the fluidized bed process, a layer of polycrystalline silicon inevitably deposits on the inner wall of the fluidized bed. Towards the end of prolonged fluidized bed operation, especially before and during maintenance shutdown, this polycrystalline silicon layer ruptures, forming small, square or rectangular polycrystalline silicon particles. While these small, square or rectangular polycrystalline silicon particles have the same quality as the granular silicon, their non-spherical shape negatively impacts the user experience for downstream customers. Furthermore, their poor flowability hinders continuous feeding. The presence of square or rectangular polycrystalline silicon also leads to inconsistencies between product quality requirements and standards, potentially causing customer complaints and resulting in price reductions for granular silicon products containing these particles, thus reducing the company's economic benefits. Therefore, separating approximately spherical granular silicon is a problem we need to solve. Utility Model Content

[0003] The purpose of this application is to provide a granular silicon separation device to solve the defect in the prior art where non-spherical polycrystalline silicon appears on the inner wall of the fluidized bed reactor after long-term use, and mixes with near-spherical granular silicon, affecting product quality.

[0004] To achieve the above objectives, this application employs the following technical solution:

[0005] This application discloses a granular silicon separation device, which includes...

[0006] A conveying assembly, wherein the conveying assembly is arranged at an angle;

[0007] A storage tank, arranged above the conveying assembly, is used for conveying the mixture;

[0008] The conveying component has a first collecting part and a second collecting part on its upper and lower sides, respectively. When the conveying component is in operation, the first collecting part and the second collecting part collect the mixture according to its shape.

[0009] In a further embodiment of this application, the storage tank is provided with a first pipe and a second pipe at its top and bottom, with the end of the second pipe away from the storage tank being arranged close to the conveying assembly.

[0010] In a further embodiment of this application, the conveying assembly includes two rotating shafts arranged at different heights, a conveyor belt is installed between the two rotating shafts, and baffles are provided on both sides of the conveyor belt.

[0011] In a further embodiment of this application, the first collection section includes a first collection tank, and a first discharge pipe is provided at the bottom of the first collection tank.

[0012] In a further embodiment of this application, the second collection section includes a second collection tank, and a second discharge pipe is provided at the bottom of the second collection tank.

[0013] In a further embodiment of this application, the storage tank is equipped with a guiding device for sequential discharge of the mixture;

[0014] The guiding device includes an extension pipe, a distributor, and a hopper. The extension pipe is connected to a storage tank. The distributor is fixed between the hopper and the extension pipe. The distributor contains multiple partitions that divide the interior of the distributor into multiple flow channels.

[0015] A further embodiment of this application includes a protective cover that covers the conveying assembly and a portion of the storage tank, the first collection section, and the second collection section.

[0016] In a further embodiment of this application, the storage tank, the first collection section, and the second collection section are all equipped with valves.

[0017] The beneficial effects of this application are as follows:

[0018] This application designs an inclined conveying component. When crystalline silicon in the storage tank is discharged onto the conveying component, the square or rectangular polycrystalline silicon has a large contact area and high friction with the conveying component, while the granular silicon (approximately spherical) has a small contact area and low friction with the conveying component. The square or rectangular polycrystalline silicon can move with the conveying component, while the granular silicon slides down the inclined slope, thus achieving rapid and effective separation of the two types of silicon.

[0019] The storage tank is equipped with a guiding device, and the silicon is evenly introduced into the silo through the distributor. The silicon product is then evenly distributed on the conveyor belt 9 through the silo, which improves the overall processing capacity of the device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the granular silicon separation device in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the structure at the conveyor belt in an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of the guide device and conveyor belt combination in the embodiments of this application;

[0023] Figure 4 This is a schematic diagram of the guiding device in the embodiments of this application;

[0024] The components are as follows: 1. First pipeline; 2. Valve 1; 3. Storage tank; 4. Second pipeline; 5. Valve 2; 6. Protective cover; 7. Extension pipeline; 8. Valve 3; 9. Conveyor belt; 10. Rotating shaft; 11. First collection tank; 12. Valve 4; 13. First discharge pipe; 14. Second collection tank; 15. Valve 5; 16. Second discharge pipe; 17. Baffle; 18. Hopper; 19. Distributor; 20. Baffle. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0026] like Figure 1 and Figure 2 As shown, this embodiment discloses a granular silicon separation device, a conveying component and a storage tank 3; the conveying component is arranged at an incline; the storage tank 3 is arranged above the conveying component for conveying the mixture; wherein, the conveying component is provided with a first collection part and a second collection part on its high and low sides respectively, and when the conveying component is started, the first collection part and the second collection part collect the mixture according to its shape.

[0027] In use, the mixed crystalline silicon falls from the storage tank 3 onto the conveying assembly. Due to the inclined arrangement of the conveying assembly, the friction between the square or rectangular polycrystalline silicon in the mixture and the conveying assembly is large, and it moves upward with the conveying assembly. At this time, the granular silicon, due to the small friction between it and the conveying assembly, will roll down the slope, easily achieving the separation of the two types of crystalline silicon, which are then collected by the first collection unit and the second collection unit respectively.

[0028] In a further embodiment, the first collection section, the second collection section, and the storage tank 3 are designed as follows, as shown in the attached figure. Figure 1As shown, the first collection section includes a first collection tank 11, with a first discharge pipe 13 at the bottom of the first collection tank 11 and a valve 12 installed on the first discharge pipe 13; the second collection section includes a second collection tank 14, with a second discharge pipe 16 at the bottom of the second collection tank 14 and a valve 15 installed on the second discharge pipe 16. In this embodiment, the installation orientation of the conveyor assembly is such that the first collection tank 11 collects quasi-square or rectangular polycrystalline silicon; the second collection tank 14 collects granular silicon; the storage tank 3 is equipped with a first pipe 1 and a second pipe 4 at the top and bottom, respectively. The end of the second pipe 4 away from the storage tank 3 is arranged close to the conveyor belt. The first pipe 1 is equipped with a valve 2, and the second pipe 4 is equipped with a valve 5. The first pipe 1 connects to an external fluidized bed. The storage tank 3 as a whole serves as a temporary storage unit, and the release amount of mixed silicon is controlled by the corresponding valves.

[0029] As attached Figure 1 and 2 As shown, in this embodiment, the conveying component is implemented using a conveyor belt 9 and two rotating shafts 10. During installation, the two rotating shafts 10 are arranged at different heights, and the conveyor belt 9 is installed between the two rotating shafts 10. At this time, the conveyor belt 9 has a certain slope. The size of the slope design is determined according to the magnitude of the friction between the mixture and the conveyor belt 9 during use. Here, it is necessary to ensure that the friction between the square or rectangular polycrystalline silicon and the conveying component is sufficient to allow the corresponding silicon to stably follow the movement of the conveyor belt 9; at the same time, it is necessary to ensure that the granular silicon rolls smoothly. Baffles 17 are provided on both sides of the conveyor belt 9 to restrict the granular silicon containing the square or rectangular polycrystalline silicon within the range of the conveyor belt 9.

[0030] The designers further considered the discharge rate and uniformity of the mixed silicon, as shown in the attached figure. Figure 2 and Figure 3 As shown, in this embodiment, a guide device is installed at the end of the second pipe 4 for sequential discharge of the mixture. The guide device extends the pipe 7, the distributor 19, and the hopper 18. The distributor 19 is fixed between the hopper 18 and the extended pipe 7. Here, the extended pipe 7 is connected to the second pipe 4, and a valve 8 is installed at the connection point. The distributor 19 contains multiple baffles 20, which divide the interior of the distributor 19 into multiple flow channels for the discharge of the mixed silicon.

[0031] During separation, it is necessary to ensure the purity of the separated material. The technicians added a protective cover during the design. After the protective cover is installed, it completely encloses the conveying components and partially encloses the storage tank 3, the first collection section and the second collection section, so that the granular silicon and the square or rectangular polycrystalline silicon inside are isolated from the outside world and are not contaminated by external impurities. The protective cover 66 can be designed as a modular type so that it can be disassembled for cleaning and maintenance.

[0032] In practical use, a valve 3 (8) is located at the lower part of the second pipe 4, and an extension pipe 7 is installed on the side of the second pipe 4. This creates a space above the valve 3 (8) for storing mixed silicon, thereby reducing the speed of the mixed silicon as it flows onto the conveyor belt surface and improving the separation effect between granular silicon and quasi-square or rectangular polycrystalline silicon. The extension pipe 7 is connected to a distributor 19, which guides the mixed silicon (containing granular silicon products with quasi-square or rectangular polycrystalline silicon) uniformly into the hopper 18 through a partition plate within the distributor 19. The hopper 18 then distributes the mixed silicon evenly on the conveyor belt 9, thereby improving the separation effect of the mixed silicon and the processing capacity of the device. As the conveyor belt 9 rotates, the quasi-square or rectangular polycrystalline silicon is carried from the lower part to the upper part and finally falls into the first collection tank 11 for collection. The granular silicon, on the other hand, rolls off the conveyor belt and falls into the second collection tank 14 for collection. The square or rectangular polycrystalline silicon in the first collection tank 11 is discharged and packaged through valve 4 12 and the first discharge pipe 13, and the granular silicon in the second collection tank 14 is discharged and packaged through valve 5 15 and the second discharge pipe 16.

[0033] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

Claims

1. A granular silicon separation device, characterized in that, include A conveying assembly, wherein the conveying assembly is arranged at an angle; A storage tank, arranged above the conveying assembly, is used for conveying the mixture; The conveying component has a first collecting part and a second collecting part on its upper and lower sides, respectively. When the conveying component is in operation, the first collecting part and the second collecting part collect the mixture according to its shape.

2. The granular silicon separation device according to claim 1, characterized in that, The storage tank is provided with a first pipe and a second pipe at the top and bottom, respectively, with the end of the second pipe away from the storage tank located close to the conveying assembly.

3. The granular silicon separation device according to claim 1, characterized in that, The conveying assembly includes two rotating shafts arranged at different heights, a conveyor belt installed between the two rotating shafts, and baffles on both sides of the conveyor belt.

4. The granular silicon separation device according to claim 1, characterized in that, The first collection section includes a first collection tank, and a first discharge pipe is provided at the bottom of the first collection tank.

5. The granular silicon separation device according to claim 1, characterized in that, The second collection section includes a second collection tank, and a second discharge pipe is provided at the bottom of the second collection tank.

6. The granular silicon separation device according to claim 1, characterized in that, The storage tank is equipped with a guiding device for the sequential discharge of the mixture; The guiding device includes an extension pipe, a distributor, and a hopper. The extension pipe is connected to a storage tank. The distributor is fixed between the hopper and the extension pipe. The distributor contains multiple partitions that divide the interior of the distributor into multiple flow channels.

7. The granular silicon separation device according to claim 1, characterized in that, It also includes a protective cover that covers the conveying assembly and a portion of the storage tank, the first collection section, and the second collection section.

8. The granular silicon separation apparatus according to any one of claims 1 to 7, characterized in that, The storage tank, the first collection section, and the second collection section are all equipped with valves.

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