Separation device for aluminum chloride impurities in polysilicon by-product treatment process

Abstract

The utility model discloses polycrystalline silicon by -product processing process in aluminium chloride impurity separation device relates to polycrystalline silicon field. Polycrystalline silicon by -product processing process in aluminium chloride impurity separation device, including preheating unit, preheating unit is linked with polycrystalline silicon by -product storage container, and polycrystalline silicon by -product storage container is connected with separation tower body through preheating unit. Polycrystalline silicon by -product processing process in aluminium chloride impurity separation device, when polycrystalline silicon by -product is preheated through preheater, is transported to separation tower body through feed pipe, and separation tower body increases the contact area of gas -liquid two -phase through tray and filler, improves separation efficiency, and vacuum pump is used for establishing negative pressure environment in separation tower body, and negative pressure environment helps to reduce the boiling point of each component in by -product, makes it more easily vaporization and separation, and flow controller carries out automatic control and adjustment to whole device, ensures the stable operation of separation process.

Description

Technical Field

[0001] This utility model relates to the field of polycrystalline silicon technology, specifically to a device for separating aluminum chloride impurities during the processing of polycrystalline silicon by-products. Background Technology

[0002] Polysilicon, as a fundamental raw material for the photovoltaic industry, occupies a crucial position in today's new energy field.

[0003] During the production of polysilicon, a large number of by-products are generated. These by-products have complex compositions and contain various impurities, such as aluminum chloride and other metallic impurities. The presence of aluminum chloride not only affects the quality of polysilicon products, but also has many adverse effects on subsequent production processes and equipment.

[0004] During the further purification of polysilicon, aluminum chloride reacts with other substances, reducing purification efficiency, increasing production costs, corroding production equipment, shortening equipment lifespan, and affecting the continuity and stability of production.

[0005] Currently, in the treatment of polysilicon by-products, traditional chemical precipitation methods, while able to remove some impurities to a certain extent, have limited effectiveness in separating metallic impurities such as aluminum chloride. Furthermore, the precipitation process easily introduces new impurities, increasing the difficulty of subsequent processing. Filtration methods suffer from low efficiency when treating by-products containing a large number of tiny particulate impurities, making it difficult to meet the needs of large-scale production. When applied to the separation of impurities from polysilicon by-products, the presence of metallic impurities such as aluminum chloride in the system leads to scaling and blockage inside the distillation column, severely affecting the normal operation of distillation and significantly reducing the separation efficiency, thus failing to effectively separate impurities such as aluminum chloride from the by-products. Therefore, this application proposes a device for separating aluminum chloride impurities in the treatment of polysilicon by-products. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides an aluminum chloride impurity separation device for polycrystalline silicon by-product processing. It solves the problems of limited separation effect of traditional chemical precipitation methods for metallic impurities such as aluminum chloride, and the easy introduction of new impurities during precipitation; low filtration efficiency when processing by-products containing a large number of tiny particulate impurities; and scaling and blockage inside the distillation column due to the presence of metallic impurities such as aluminum chloride in the system, which seriously affects the normal operation of distillation and greatly reduces the separation effect.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an aluminum chloride impurity separation device for polycrystalline silicon by-product processing, comprising a preheating unit connected to a polycrystalline silicon by-product storage container, the polycrystalline silicon by-product storage container being connected to a separation tower via the preheating unit, preheaters installed on both sides of the preheating unit for preheating the by-product to a suitable separation temperature, and a dispersion component within the preheating unit comprising two symmetrically arranged dispersion rollers rotatably connected within the preheating unit for dispersing the polycrystalline silicon by-product, thereby improving the heating uniformity of the polycrystalline silicon by-product and accelerating the preheating of the by-product to a suitable separation temperature.

[0008] Preferably, the top end face of the preheating unit is provided with a feed pipe, and the end of the feed pipe is provided with a feed pump. The feed pump is used to transport the polysilicon by-product to the preheating unit, and after the polysilicon by-product is heated by the preheating unit, it is transported to the separation tower.

[0009] Preferably, the bottom of the preheating unit is provided with a guide groove, and a material conveying pipe is fixedly connected to the bottom of the preheating unit, and the material conveying pipe is connected to the guide groove.

[0010] Preferably, one end of the dispersing roller is located outside the preheating unit, and a transmission wheel is sleeved on its outer peripheral wall. One end of the dispersing roller is connected to a drive motor.

[0011] Preferably, a transmission belt is provided with an interference fit on the outer peripheral wall of each of the two transmission wheels.

[0012] Preferably, the separation tower body is an upright cylindrical structure, and its interior is provided with multiple layers of tower plates and packing.

[0013] Preferably, the separation tower is connected to a vacuum pump via a vacuum pipeline, and the vacuum pump is used to establish a negative pressure environment inside the separation tower.

[0014] Preferably, a temperature sensor, a pressure sensor, and a flow controller are installed in the separation tower body, and the flow controller is installed at the bottom of the separation tower body.

[0015] This utility model discloses an aluminum chloride impurity separation device in the process of polycrystalline silicon by-product treatment, which has the following beneficial effects:

[0016] In the polysilicon by-product processing, the aluminum chloride impurity separation device separates the polysilicon by-products when they enter the preheating unit. Under the action of the dispersion component, the polysilicon by-products are separated, improving the preheating uniformity of the polysilicon by-products and increasing the efficiency of subsequent separation. After preheating by the preheater, the polysilicon by-products are transported to the separation tower through the conveying pipe.

[0017] The separation tower increases the contact area between the gas and liquid phases through trays and packing, thereby improving separation efficiency. A vacuum pump is used to establish a negative pressure environment inside the separation tower. This negative pressure environment helps to lower the boiling point of each component in the by-products, making them easier to vaporize and separate. The vacuum level can be adjusted according to actual production needs. Sensors and controllers transmit the collected data to the control cabinet. The control system inside the control cabinet, based on preset parameters and in conjunction with the flow controller, performs automated control and adjustment of the entire device to ensure stable operation of the separation process. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0020] Figure 2 This is a schematic diagram of the internal structure of the preheating unit in this embodiment;

[0021] Figure 3 This is a schematic diagram of the distributed component structure in this embodiment.

[0022] In the diagram: 1. Preheating unit; 11. Dispersion assembly; 111. Dispersion roller; 112. Drive wheel; 113. Drive belt; 12. Preheater; 13. Guide trough; 14. Feed pipe; 15. Conveyor pipe; 2. Separation tower body; 3. Flow controller. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] This application provides an aluminum chloride impurity separation device for polysilicon by-product processing. It solves the problems of limited separation effect of traditional chemical precipitation method for metal impurities such as aluminum chloride, and easy introduction of new impurities during precipitation; low filtration efficiency when processing by-products containing a large number of small particulate impurities; and scaling and blockage inside the distillation column due to the presence of metal impurities such as aluminum chloride in the system, which seriously affects the normal operation of distillation and greatly reduces the separation effect. The device achieves separation of polysilicon by-products when they enter the preheating unit 1 under the action of the dispersion component 11, improving the preheating uniformity of polysilicon by-products and improving the efficiency of subsequent separation. After preheating by the preheater 12, the polysilicon by-products are transported to the separation tower 2 through the feed pipe 15.

[0025] The separation tower 2 increases the contact area between the gas and liquid phases through the tower plates and packing, thereby improving the separation efficiency. The vacuum pump is used to establish a negative pressure environment inside the separation tower 2. The negative pressure environment helps to lower the boiling point of each component in the by-product, making it easier for them to vaporize and separate. The vacuum degree can be adjusted according to actual production needs. The sensors and controllers transmit the collected data to the control cabinet. The control system in the control cabinet, in conjunction with the flow controller 3, automatically controls and adjusts the entire device according to the preset parameters, ensuring the stable operation of the separation process.

[0026] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0027] This utility model discloses an aluminum chloride impurity separation device in the process of polycrystalline silicon by-product treatment.

[0028] Example 1:

[0029] According to the appendix Figure 1-3 As shown, the system includes a preheating unit 1, which is connected to a polysilicon by-product storage container. The polysilicon by-product storage container is connected to a separation tower 2 via the preheating unit 1. Preheaters 12 are installed on both sides of the interior of the preheating unit 1. The preheaters 12 are used to preheat the by-products to a suitable temperature for separation. A dispersion component 11 is provided in the preheating unit 1. The dispersion component 11 includes two symmetrically arranged dispersion rollers 111, which are rotatably connected in the preheating unit 1. The dispersion component 11 is used to disperse the polysilicon by-products, improve the heating uniformity of the polysilicon by-products, and accelerate the preheating of the by-products to a suitable temperature for separation.

[0030] The top end face of the preheating unit 1 is provided with a feed pipe 14, and the end of the feed pipe 14 is provided with a feed pump. The feed pump is used to transport the polysilicon by-product to the preheating unit 1. After the polysilicon by-product is heated by the preheating unit 1, it is transported to the separation tower 2.

[0031] The bottom of the preheating unit 1 is provided with a guide groove 13, and a material conveying pipe 15 is fixedly connected to the bottom of the preheating unit 1. The material conveying pipe 15 is connected to the guide groove 13.

[0032] After the polysilicon by-product is preheated by the preheater 12, it falls onto the guide trough 13 and enters the conveying pipe 15 under the action of the guide trough 13. The preheated polysilicon by-product is then conveyed to the separation tower 2 through the conveying pipe 15.

[0033] One end of the dispersing roller 111 is outside the preheating unit 1, and a transmission wheel 112 is sleeved on its outer peripheral wall. One end of the dispersing roller 111 is connected to a drive motor.

[0034] The outer peripheral walls of the two drive wheels 112 are fitted with drive belts 113 with an interference fit.

[0035] The dispersing roller 111 is driven by a drive motor to rotate. The rotation of the dispersing roller 111 causes the transmission wheel 112 to rotate. At this time, the transmission wheel 112 drives the transmission belt 113 to rotate. Under the transmission of the transmission belt 113, the two dispersing rollers 111 rotate simultaneously, thereby separating the polycrystalline silicon by-products, improving the preheating uniformity of the polycrystalline silicon by-products, and improving the efficiency of subsequent separation.

[0036] Example 2:

[0037] According to the appendix Figure 1-3 As shown, the system includes a preheating unit 1, which is connected to a polysilicon by-product storage container. The polysilicon by-product storage container is connected to a separation tower 2 via the preheating unit 1. Preheaters 12 are installed on both sides of the interior of the preheating unit 1. The preheaters 12 are used to preheat the by-products to a suitable temperature for separation. A dispersion component 11 is provided in the preheating unit 1. The dispersion component 11 includes two symmetrically arranged dispersion rollers 111, which are rotatably connected in the preheating unit 1. The dispersion component 11 is used to disperse the polysilicon by-products, improve the heating uniformity of the polysilicon by-products, and accelerate the preheating of the by-products to a suitable temperature for separation.

[0038] The separation tower body 2 is an upright cylindrical structure with multiple layers of trays and packing inside. The trays and packing increase the contact area between the gas and liquid phases, thereby improving the separation efficiency.

[0039] The separation tower 2 is connected to a vacuum pump via a vacuum pipeline. The vacuum pump is used to establish a negative pressure environment inside the separation tower 2.

[0040] A negative pressure environment helps lower the boiling point of each component in the byproducts, making them easier to vaporize and separate. The vacuum level can be adjusted according to actual production needs.

[0041] Temperature sensor, pressure sensor and flow controller 3 are installed in the separation tower body 2. Flow controller 3 is installed at the bottom of the separation tower body 2. Temperature sensor is used to monitor temperature changes in the separation tower body 2 in real time. Pressure sensor is used to monitor pressure in the separation tower body 2.

[0042] An external control cabinet is installed. The sensors and controllers transmit the collected data to the control cabinet. The control system inside the control cabinet, in conjunction with the flow controller 3, automatically controls and regulates the entire device according to the preset parameters to ensure the stable operation of the separation process.

[0043] The separation tower body 2 is made of high-strength, corrosion-resistant metal materials, such as titanium alloy, to resist corrosion from impurities such as aluminum chloride.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for separating aluminum chloride impurities during the processing of polycrystalline silicon by-products, characterized in that, The system includes a preheating unit (1) connected to a polysilicon by-product storage container. The polysilicon by-product storage container is connected to a separation tower (2) via the preheating unit (1). Preheaters (12) are installed on both sides of the interior of the preheating unit (1). The preheaters (12) are used to preheat the by-products to a suitable temperature for separation. A dispersion component (11) is provided in the preheating unit (1). The dispersion component (11) includes two symmetrically arranged dispersion rollers (111). The dispersion rollers (111) are rotatably connected in the preheating unit (1). The dispersion component (11) is used to disperse the polysilicon by-products, improve the heating uniformity of the polysilicon by-products, and accelerate the preheating of the by-products to a suitable temperature for separation.

2. The aluminum chloride impurity separation device in the polycrystalline silicon by-product processing according to claim 1, characterized in that, The top end face of the preheating unit (1) is provided with a feed pipe (14), and the end of the feed pipe (14) is provided with a feed pump. The feed pump is used to transport polysilicon by-products to the preheating unit (1). After the polysilicon by-products are heated by the preheating unit (1), they are transported to the separation tower (2).

3. The aluminum chloride impurity separation device in the polycrystalline silicon by-product processing according to claim 1, characterized in that, The bottom of the preheating unit (1) is provided with a guide groove (13), and a conveying pipe (15) is fixedly connected to the bottom of the preheating unit (1). The conveying pipe (15) is connected to the guide groove (13).

4. The aluminum chloride impurity separation device in the polycrystalline silicon by-product processing according to claim 1, characterized in that, One end of the dispersing roller (111) is outside the preheating unit (1), and a transmission wheel (112) is sleeved on its outer peripheral wall. One end of the dispersing roller (111) is connected to a drive motor.

5. The aluminum chloride impurity separation device in the polycrystalline silicon by-product processing according to claim 4, characterized in that, A transmission belt (113) is interference-fitted onto the outer peripheral wall of each of the two transmission wheels (112).

6. The aluminum chloride impurity separation device in the polycrystalline silicon by-product processing according to claim 1, characterized in that, The separation tower body (2) is an upright cylindrical structure, and its interior is equipped with multiple layers of tower plates and packing.

7. The aluminum chloride impurity separation device in the polycrystalline silicon by-product processing according to claim 6, characterized in that, The separation tower (2) is connected to a vacuum pump via a vacuum pipeline, which is used to establish a negative pressure environment inside the separation tower (2).

8. The aluminum chloride impurity separation device in the polycrystalline silicon by-product processing according to claim 7, characterized in that, Temperature sensor, pressure sensor and flow controller (3) are installed in the separation tower body (2), and flow controller (3) is installed at the bottom of the separation tower body (2).

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