A device for recovering aluminum chloride in a polysilicon by-product treatment process
By designing a polycrystalline silicon by-product processing device, and utilizing electric heating, filtration, and cooling to control the dissolution and crystallization processes, the efficient recovery of aluminum chloride was achieved, overcoming the drawbacks of traditional methods and meeting the needs of large-scale production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGXIA SHENGLAN CHEM ENVIRONMENTAL PROT TECH CO LTD
- Filing Date
- 2025-05-21
- Publication Date
- 2026-06-02
AI Technical Summary
In traditional polysilicon by-product treatment methods, aluminum chloride is difficult to separate and recover efficiently. Chemical precipitation consumes a large amount of reagents and generates sludge. Existing equipment has low recovery efficiency and is prone to corrosion, which cannot meet the needs of large-scale production.
Design an aluminum chloride recovery device including a pretreatment unit, a dissolution unit, a crystallization unit, and a drying unit. The device utilizes an electric heating wire and a temperature sensor to control the dissolution temperature, a filter to remove impurities, a cooling jacket to control the crystallization temperature, and a hot air blower to dry the crystallized product, thereby achieving efficient aluminum chloride recovery.
It improves the recovery efficiency and purity of aluminum chloride, solves the drawbacks of traditional methods, meets the needs of large-scale production, and reduces processing costs and environmental burden.
Smart Images
Figure CN224307849U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of polysilicon by-product processing technology, specifically to an aluminum chloride recovery device in the polysilicon by-product processing process. Background Technology
[0002] Traditional methods for treating polysilicon byproducts often focus on the separation and purification of the main substances, lacking effective means for aluminum chloride recovery. Conventional physical separation methods, such as simple filtration and precipitation, are difficult to achieve efficient separation and recovery due to the complex forms of aluminum chloride in the byproducts and its intermingling with other substances. While chemical precipitation can recover aluminum chloride to some extent, it suffers from drawbacks such as high reagent consumption, harsh reaction conditions, and the generation of large amounts of sludge, increasing subsequent treatment costs and environmental burden. Furthermore, existing aluminum chloride recovery processes also have design flaws, such as low recovery efficiency, equipment susceptibility to corrosion, and poor operational stability, resulting in unsatisfactory aluminum chloride recovery and failing to meet the dual requirements of resource recovery and environmental protection in large-scale production.
[0003] Aluminum chloride exists in complex forms as a byproduct, and conventional physical separation methods such as filtration and precipitation are difficult to achieve efficient separation and recovery. Chemical precipitation methods have drawbacks such as high reagent consumption, harsh reaction conditions, and the generation of large amounts of sludge, which increase treatment costs and environmental burden. Existing recovery equipment has poor aluminum chloride recovery efficiency and cannot meet the needs of large-scale production. Utility Model Content
[0004] To address the shortcomings of existing technologies, this invention provides an aluminum chloride recovery device in the polycrystalline silicon by-product treatment process. It solves the problems that aluminum chloride exists in complex forms in by-products, and that conventional physical separation methods such as simple filtration and precipitation are difficult to achieve efficient separation and recovery; chemical precipitation methods have drawbacks such as high reagent consumption, harsh reaction conditions, and the generation of large amounts of sludge, which increase treatment costs and environmental burden; and existing recovery equipment has poor aluminum chloride recovery effect and cannot meet the needs of large-scale production.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an aluminum chloride recovery device in the polycrystalline silicon by-product processing process, comprising a pretreatment unit, a dissolution unit, a crystallization unit, and a drying unit, wherein the pretreatment unit, dissolution unit, crystallization unit, and drying unit are connected sequentially, and the dissolution unit includes:
[0006] A dissolving vessel, wherein an electric heating wire and a temperature sensor are provided on the inner side of the dissolving vessel;
[0007] The first pump is located outside the dissolving tank and is equipped with a first conveying pipe, one end of which is connected to the outside of the dissolving tank.
[0008] A filter is disposed on the first feed pipe and located at the end away from the dissolving tank;
[0009] The crystallization unit includes:
[0010] Crystallization tank;
[0011] Cooling jacket, which is fitted onto the outside of the crystallization tank;
[0012] The second pump is equipped with a second conveying pipe, one end of which is connected to the bottom of the dissolving tank and the other end is connected to the outside of the crystallizing tank.
[0013] Preferably, the pretreatment unit is provided with a treatment tank, which is sleeved on the outside of the other end of the first conveying pipe. A fixing frame is provided on the top of the treatment tank, and a slag discharge port is provided at the bottom of the treatment tank. A stirring device is inserted into the inside of the fixing frame.
[0014] Preferably, the stirring device is provided with a shaft, a support rod, and a helical blade, with one end of the support rod connected to the outside of the shaft and the helical blade connected to the other end of the support rod.
[0015] Preferably, the pretreatment unit is equipped with a diaphragm pump, which is located outside the treatment tank. The diaphragm pump is connected to a feed pipe, one end of which is inserted into the inside of the treatment tank.
[0016] Preferably, the melting tank is provided with a sealing cap and an exhaust port on the top.
[0017] Preferably, a stirring rod is inserted into the inner side of the crystallization tank, a fixing frame is connected to the outer side of the stirring rod, blades are connected to both sides of the fixing frame, and a discharge pipe is provided at the bottom of the crystallization tank.
[0018] Preferably, the cooling jacket is provided with water inlet and outlet on its outer side.
[0019] Preferably, the drying unit is provided with a drying bed and a hot air blower. The drying bed is located below the outlet end of the discharge pipe. A filter plate is provided on the inner side of the drying bed. The filter plate is a porous plate structure. A drain outlet is provided on the outer side of the drying bed. The drain outlet is located below the filter plate.
[0020] Preferably, the hot air blower is provided with a diversion pipe, which is connected to the outside of the drying bed and located below the filter plate.
[0021] This utility model discloses an aluminum chloride recovery device in the polycrystalline silicon by-product treatment process, which has the following beneficial effects:
[0022] 1. This utility model, by setting up a pretreatment unit, a dissolution unit, a crystallization unit and a drying unit, can efficiently recover aluminum chloride from polycrystalline silicon by-products, solving the problems that traditional physical separation methods are difficult to achieve efficient separation and the many drawbacks of chemical precipitation methods.
[0023] 2. The electric heating wire and temperature sensor in the dissolving unit can accurately control the dissolving temperature and improve the dissolving efficiency. The filter can filter the dissolved material to ensure the smooth progress of subsequent processing.
[0024] 3. The cooling jacket in the crystallization unit can precisely control the crystallization temperature, and the stirring rod and blades rotate slowly, which can promote uniform crystal growth and improve crystallization efficiency.
[0025] 4. The hot air blower and diversion pipe in the drying unit can efficiently dry the crystallized product, while the filter plate and drain outlet can effectively separate the liquid and improve the purity of the recovered product. Attached Figure Description
[0026] 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.
[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0028] Figure 2 This is a schematic diagram of the preprocessing unit of this utility model;
[0029] Figure 3 This is a schematic diagram of the structure of the stirring device of this utility model;
[0030] Figure 4 This is a schematic diagram of the dissolving unit of this utility model;
[0031] Figure 5 This is a schematic diagram of the structure of the dissolving tank of this utility model;
[0032] Figure 6 This is a schematic diagram of the crystallization unit of this utility model;
[0033] Figure 7 This is a schematic diagram of the structure of the stirrer of this utility model;
[0034] Figure 8 This is a schematic diagram of the drying unit of this utility model.
[0035] In the diagram: 1. Pretreatment unit; 11. Treatment tank; 111. Fixing frame; 112. Slag discharge port; 12. Stirring device; 121. Shaft; 122. Support rod; 123. Spiral impeller; 13. Diaphragm pump; 131. Feed pipe; 2. Dissolving unit; 21. Dissolving tank; 211. Sealing cover; 212. Exhaust port; 213. Electric heating wire; 214. Temperature sensor; 22. First pump; 22 1. First feed pipe; 23. Filter; 3. Crystallization unit; 31. Crystallization tank; 311. Stirring rod; 3111. Fixing frame; 3112. Paddle; 312. Discharge pipe; 32. Cooling jacket; 321. Inlet and outlet; 33. Second pump; 331. Second feed pipe; 4. Drying unit; 41. Drying bed; 411. Filter plate; 412. Drain; 42. Hot air blower; 421. Diverter pipe. Detailed Implementation
[0036] 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.
[0037] This application provides an aluminum chloride recovery device in the polysilicon by-product treatment process, which solves the problems of aluminum chloride existing in complex forms in by-products, making it difficult for simple physical separation methods such as filtration and precipitation to achieve efficient separation and recovery; chemical precipitation methods have drawbacks such as large reagent consumption, harsh reaction conditions, and the generation of large amounts of sludge, which increase treatment costs and environmental burden; existing recovery equipment has poor aluminum chloride recovery effect and cannot meet the needs of large-scale production, thus failing to achieve efficient and stable separation of aluminum chloride.
[0038] This utility model discloses an aluminum chloride recovery device in the polycrystalline silicon by-product processing process.
[0039] Example 1
[0040] According to the appendix Figure 1-8 As shown, it includes a pretreatment unit 1, a dissolving unit 2, a crystallization unit 3, and a drying unit 4, which are connected in sequence. The dissolving unit 2 includes:
[0041] Dissolving vessel 21, with an electric heating wire 213 and a temperature sensor 214 installed inside the dissolving vessel 21;
[0042] The first pump 22 is located outside the dissolving tank 21. The first pump 22 is equipped with a first conveying pipe 221, one end of which is connected to the outside of the dissolving tank 21.
[0043] Filter 23 is installed on the first feed pipe 221 and located at the end away from the dissolving tank 21. It uses a high-precision filter screen with a pore size of [missing information], which can intercept large particulate impurities and unreacted substances in the by-products and prevent them from entering the subsequent recovery system and causing blockage and interference.
[0044] Crystallization unit 3 includes:
[0045] Crystallization tank 31;
[0046] Cooling jacket 32 is sleeved on the outside of crystallization tank 31;
[0047] The second pump 33 is equipped with a second conveying pipe 331, one end of which is connected to the bottom of the dissolving tank 21 and the other end is connected to the outside of the crystallizing tank 31.
[0048] This invention, by setting up a pretreatment unit 1, a dissolution unit 2, a crystallization unit 3, and a drying unit 4, enables the efficient recovery of aluminum chloride from polycrystalline silicon byproducts, solving the problems of traditional physical separation methods' difficulty in achieving efficient separation and the numerous drawbacks of chemical precipitation methods. In the dissolution unit 2, the electric heating wire 213 and temperature sensor 214 precisely control the dissolution temperature, improving dissolution efficiency. The filter 23 filters the dissolved material, ensuring smooth subsequent processing. In the crystallization unit 3, the cooling jacket 32 precisely controls the crystallization temperature, and the stirring rod 311 and impeller 3112 rotate slowly, promoting uniform crystal growth and improving crystallization efficiency. In the drying unit 4, the hot air blower 42 and the diversion pipe 421 efficiently dry the crystallized product, and the filter plate 411 and drain outlet 412 effectively separate the liquid, improving the purity of the recovered product.
[0049] Furthermore, the pretreatment unit 1 is provided with a treatment tank 11, which is sleeved on the outside of the other end of the first conveying pipe 221. A fixing frame 111 is provided on the top of the treatment tank 11, and a slag discharge port 112 is provided at the bottom of the treatment tank 11 for discharging larger impurity particles. A stirring device 12 is inserted into the inner side of the fixing frame 111.
[0050] Furthermore, the stirring device 12 is provided with a shaft 121, a support rod 122 and a spiral blade 123. One end of the support rod 122 is connected to the outside of the shaft 121, and the spiral blade 123 is connected to the other end of the support rod 122. The spiral blade 123 can effectively prevent by-products from settling.
[0051] Furthermore, the pretreatment unit 1 is equipped with a diaphragm pump 13, which is located outside the treatment tank 11. The flow rate can be adjusted according to the processing volume requirements to ensure that the by-products are evenly fed into the treatment tank 11. The diaphragm pump 13 is connected to a feed pipe 131, one end of which is inserted into the inside of the treatment tank 11.
[0052] Specifically disclosed, the top of the dissolving tank 21 is provided with a sealing cover 211 and an exhaust port 212. The sealing cover 211 prevents solvent evaporation and the entry of external impurities, and the exhaust port 212 is connected to a waste gas treatment device.
[0053] Specifically disclosed, a stirring rod 311 is inserted into the inner side of the crystallization tank 31, a fixing frame 3111 is connected to the outer side of the stirring rod 311, paddles 3112 are connected to both sides of the fixing frame 3111, and a discharge pipe 312 is provided at the bottom of the crystallization tank 31.
[0054] It should be emphasized that the cooling jacket 32 has inlet and outlet ports 321 on its outer side.
[0055] It should be emphasized that the drying unit 4 is equipped with a drying bed 41 and a hot air blower 42. The drying bed 41 is located below the outlet end of the discharge pipe 312. A filter plate 411 is provided on the inner side of the drying bed 41. The filter plate 411 is a perforated plate structure. A drain outlet 412 is provided on the outer side of the drying bed 41. The drain outlet 412 is located below the filter plate 411.
[0056] Example 2
[0057] According to the appendix Figure 1-8 As shown, it includes a pretreatment unit 1, a dissolving unit 2, a crystallization unit 3, and a drying unit 4, which are connected in sequence. The dissolving unit 2 includes:
[0058] Dissolving vessel 21, with an electric heating wire 213 and a temperature sensor 214 installed inside the dissolving vessel 21;
[0059] The first pump 22 is located outside the dissolving tank 21. The first pump 22 is equipped with a first conveying pipe 221, one end of which is connected to the outside of the dissolving tank 21.
[0060] Filter 23 is disposed on the first feed pipe 221 and located at the end away from the dissolving tank 21;
[0061] Crystallization unit 3 includes:
[0062] Crystallization tank 31;
[0063] Cooling jacket 32 is sleeved on the outside of crystallization tank 31;
[0064] The second pump 33 is equipped with a second conveying pipe 331, one end of which is connected to the bottom of the dissolving tank 21 and the other end is connected to the outside of the crystallizing tank 31.
[0065] It should be emphasized that the hot air blower 42 is equipped with a diversion pipe 421, which is connected to the outside of the drying bed 41 and located below the filter plate 411.
[0066] Working principle: After the material enters the dissolving tank 21, the electric heating wire 213 is turned on, and the temperature sensor 214 monitors the temperature inside the dissolving tank 21 in real time. The heating power of the electric heating wire 213 is adjusted as needed to ensure that the material is fully dissolved. After being filtered by the filter 23, the dissolved material is pumped into the crystallization unit 3 through the first pump 22 and the first conveying pipe 221. The dissolved material enters the crystallization tank 31 through the first conveying pipe 221. The inlet and outlet ports 321 of the cooling jacket 32 are opened to control the circulation of the coolant and regulate the temperature inside the crystallization tank 31. At the same time, the stirring rod 311 is started, which drives the fixed frame 3111 and the blades 3112 to rotate, accelerating the crystallization process and promoting uniform crystal growth. The crystallized product is discharged through the discharge pipe 312 and enters the drying unit 4.
[0067] 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. An aluminum chloride recovery apparatus in a polysilicon byproduct treatment process, comprising a pretreatment unit (1), a dissolution unit (2), a crystallization unit (3), and a drying unit (4), the pretreatment unit (1), the dissolution unit (2), the crystallization unit (3), and the drying unit (4) being connected in sequence, characterized in that, The dissolution unit (2) includes: A dissolving vessel (21) is provided with an electric heating wire (213) and a temperature sensor (214) inside the dissolving vessel (21); The first pump (22) is located outside the dissolving tank (21). The first pump (22) is equipped with a first conveying pipe (221), one end of which is connected to the outside of the dissolving tank (21). A filter (23) is disposed on the first feed pipe (221) and located at the end away from the dissolving tank (21); The crystallization unit (3) includes: Crystallization tank (31); Cooling sleeve (32), which is sleeved on the outside of the crystallization tank (31); The second pump (33) is equipped with a second conveying pipe (331), one end of which is connected to the bottom of the dissolving tank (21) and the other end is connected to the outside of the crystallizing tank (31).
2. The apparatus according to claim 1, wherein The pretreatment unit (1) is provided with a treatment tank (11), which is sleeved on the outside of the other end of the first conveying pipe (221). A fixing frame (111) is provided on the top of the treatment tank (11), and a slag discharge port (112) is provided at the bottom of the treatment tank (11). A stirring device (12) is inserted into the inside of the fixing frame (111).
3. The apparatus according to claim 2, wherein The stirring device (12) is provided with a shaft (121), a support rod (122) and a spiral blade (123). One end of the support rod (122) is connected to the outside of the shaft (121), and the spiral blade (123) is connected to the other end of the support rod (122).
4. The apparatus for recovering aluminum chloride in a polysilicon byproduct treatment process according to claim 2, wherein The pretreatment unit (1) is equipped with a diaphragm pump (13), which is located outside the treatment tank (11). The diaphragm pump (13) is connected to a feed pipe (131), one end of which is inserted into the inside of the treatment tank (11).
5. The apparatus for recovering aluminum chloride in a polysilicon byproduct treatment process according to claim 1, wherein The melting tank (21) is provided with a sealing cover (211) and an exhaust port (212) on the top.
6. The apparatus for recovering aluminum chloride in a polysilicon byproduct treatment process according to claim 1, wherein A stirring rod (311) is inserted into the inner side of the crystallization tank (31), a fixing frame (3111) is connected to the outer side of the stirring rod (311), paddles (3112) are connected to both sides of the fixing frame (3111), and a discharge pipe (312) is provided at the bottom of the crystallization tank (31).
7. The apparatus for recovering aluminum chloride in a polysilicon byproduct treatment process according to claim 1, wherein The cooling jacket (32) is provided with an inlet and outlet (321) on the outside.
8. The apparatus for recovering aluminum chloride in a polysilicon byproduct treatment process according to claim 1, wherein The drying unit (4) is provided with a drying bed (41) and a hot air blower (42). The drying bed (41) is located below the outlet end of the discharge pipe (312). A filter plate (411) is provided on the inner side of the drying bed (41). The filter plate (411) is configured as a porous plate structure. A drain outlet (412) is provided on the outer side of the drying bed (41). The drain outlet (412) is located below the filter plate (411).
9. The apparatus according to claim 8, wherein The hot air blower (42) is provided with a diversion pipe (421), which is connected to the outside of the drying bed (41) and located below the filter plate (411).