Hydrofluoric acid distillation apparatus

Abstract

The utility model discloses a kind of hydrofluoric acid distillation equipment, it relates to the field of hydrofluoric acid processing, including distillation tank and the sealing cover being located at its top, the drive shaft is equipped in the inside of distillation tank, the arc-shaped scraper pole is fixedly connected with arc-shaped scraper pole in the bottom end of drive shaft by multiple link rods equidistantly distributed along circumferential trajectory, with the rotation of drive shaft, arc-shaped scraper pole rotates along distillation tank bottom wall.The utility model is equipped with rotatable arc-shaped scraper pole, can strip fluorosilicic acid impurities deposited on the inner bottom wall of distillation tank, avoid fluorosilicic acid impurities to be adhered to the inner bottom wall of distillation tank.Linkage scraper has cleaning effect on the inner wall of distillation tank, can effectively avoid fluorosilicic acid deposit to be adhered to the inner wall of distillation tank.Shear force can be formed between dispersion rod and arc-shaped scraper pole, fluorosilicic acid deposit is sheared, and the volume of deposit is reduced.The phenomenon that a large amount of deposit is hardened on the inner bottom wall of distillation tank is avoided, and the cleaning effect is improved, so as to facilitate subsequent comprehensive cleaning operation to distillation tank.

Description

Technical Field

[0001] This utility model relates to the field of hydrofluoric acid processing, and in particular to a hydrofluoric acid distillation device. Background Technology

[0002] Distillation is a crucial purification and separation step in hydrofluoric acid processing. It utilizes the significant volatility difference between hydrofluoric acid and other major impurities, allowing the hydrofluoric acid to vaporize through heating, thus purifying it. Simultaneously, it efficiently removes impurities, improves product purity, separates byproducts, and controls concentration, ultimately producing hydrofluoric acid products that meet the stringent requirements of various industries, laboratories, and high-end electronics / photovoltaic fields.

[0003] In the production of hydrofluoric acid, it is produced by reacting fluorite with sulfuric acid. However, the natural silica in fluorite can trigger a side reaction, forming fluorosilicic acid. The fluorosilicic acid in the mixed solution can reduce the concentration of effective hydrofluoric acid, decreasing the product's value. Furthermore, fluorosilicic acid is easily hydrolyzed to form deposited colloids that accumulate in pipes and valves, causing metal corrosion and accelerating equipment wear. In existing hydrofluoric acid distillation equipment, during the distillation and extraction of hydrofluoric acid gas, the deposited fluorosilicic acid easily adheres and cakes onto the inner walls of the distillation equipment. With prolonged distillation operations, this adhered and caked fluorosilicic acid is difficult to clean, resulting in significant operational difficulties and time consumption. Utility Model Content

[0004] To address the aforementioned issues, this application provides a hydrofluoric acid distillation apparatus.

[0005] To achieve the above objectives, this application provides the following technical solution: a hydrofluoric acid distillation device, including a distillation tank and a sealing cover on its top, wherein a drive shaft is provided inside the distillation tank, and an arc-shaped scraper is fixedly connected to the bottom end of the drive shaft through multiple connecting rods equidistantly distributed along a circumferential trajectory. As the drive shaft rotates, the arc-shaped scraper rotates along the bottom wall of the distillation tank.

[0006] The distillation tank is equipped with multiple sets of extension rods equidistantly distributed along a circular trajectory. Each set of extension rods is composed of multiple extension rods arranged in parallel from top to bottom. The end of each set of extension rods near the inner side wall of the distillation tank is fixed by a linkage scraper. Multiple dispersing rods are fixedly connected to the lowermost extension rod in each set of extension rods. The dispersing rods are all located above the arc-shaped scraper. When the arc-shaped scraper rotates, the multiple sets of extension rods, the linkage scraper, and the dispersing rods rotate in the opposite direction.

[0007] Furthermore, the sealing cover is provided with a partition, the drive shaft is rotatably mounted to the partition, and the top end of the drive shaft extends through the sealing cover to its top. The sealing cover is provided with a drive motor that is connected to the drive shaft.

[0008] Furthermore, the drive shaft is provided with a drive gear, which is located above the partition plate. A first linkage gear that is on the same horizontal plane is meshed with the drive gear. The first linkage gear is connected to a second linkage gear through a synchronous shaft. The second linkage gear is located below the first linkage gear. The synchronous shaft is installed with the side wall of the sealing cover through a support frame. When the drive shaft and the drive gear rotate synchronously, the first linkage gear, the synchronous shaft and the second linkage gear all rotate in opposite directions.

[0009] Furthermore, multiple sets of the aforementioned extension rods are distributed around the outside of the drive shaft, and the end of each set of extension rods near the drive shaft is fixed by a positioning vertical rod. The top ends of the multiple positioning vertical rods distributed around the outer periphery of the drive shaft are fixed by a drive sleeve, which is located outside the drive shaft and is rotatably mounted to the partition.

[0010] Furthermore, a guide gear ring is fixedly connected to the top of the drive sleeve via a positioning bracket. The guide gear ring is rotatably mounted on the upper surface of the partition plate. The second linkage gear is located inside the guide gear ring and meshes with it. When the first linkage gear, the synchronous shaft, and the second linkage gear rotate synchronously, the guide gear ring, the positioning bracket, and the drive sleeve rotate in the same direction.

[0011] Furthermore, the sealing cover is provided with a steam output pipe, which extends through the partition and into the inside of the distillation tank.

[0012] In summary, the technical effects and advantages of this utility model are as follows:

[0013] This invention features a rotatable arc-shaped scraper that can peel off fluorosilicic acid impurities deposited on the bottom wall of the distillation tank, preventing them from adhering to the tank's inner wall. It also includes a linkage scraper and a dispersing rod that rotate in opposite directions. The linkage scraper effectively cleans the inner wall of the distillation tank, preventing fluorosilicic acid deposits from adhering to it. The dispersing rod and the arc-shaped scraper create a shearing force, cutting away the fluorosilicic acid deposits and reducing their volume. This prevents large amounts of deposits from accumulating on the bottom wall of the distillation tank, improving cleaning efficiency and facilitating subsequent comprehensive cleaning of the distillation tank. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of the distillation jar of this utility model after it has been cut open.

[0017] Figure 3 This is a schematic diagram of the structure of the distillation jar and sealing cap of this utility model after being cut open.

[0018] Figure 4 This utility model Figure 3 Enlarged diagram of point A in the middle.

[0019] Figure 5 This is a schematic diagram showing the relative positions of the drive shaft, arc-shaped scraper, drive sleeve, linkage scraper, and dispersion rod of this utility model.

[0020] In the diagram: 1. Distillation tank; 2. Sealing cap; 3. Drive shaft; 4. Connecting rod; 5. Arc-shaped scraper; 6. Drive sleeve; 7. Positioning vertical rod; 8. Extension rod; 9. Linkage scraper; 10. Dispersing rod; 11. Drive gear; 12. First linkage gear; 13. Synchronous shaft; 14. Second linkage gear; 15. Guide gear ring; 16. Positioning support; 17. Support frame; 18. Steam output pipe; 19. Baffle plate; 20. Drive motor. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example: Reference Figure 1-3 The hydrofluoric acid distillation apparatus shown includes a distillation tank 1 and a sealing cover 2 on top of it. In this invention, the distillation tank 1 is electrically heated. During the heating process, water can be selectively evaporated by controlling the distillation conditions (such as pressure and temperature). Since the boiling point of hydrogen fluoride is 19.5°C and the decomposition temperature of fluorosilicic acid is 108°C, during the distillation process, the vaporized hydrogen fluoride gas can be discharged outside the distillation tank 1, while the fluorosilicic acid, due to its high boiling point, remains in the residual liquid inside the distillation tank 1. The residual fluorosilicic acid is easily hydrolyzed to form a deposition phenomenon.

[0023] In this invention, a drive shaft 3 is provided inside the distillation tank 1. An arc-shaped scraper 5 is fixedly connected to the bottom end of the drive shaft 3 via multiple connecting rods 4 evenly distributed along a circumferential trajectory. As the drive shaft 3 rotates, the arc-shaped scraper 5 rotates along the bottom wall of the distillation tank 1. The arc-shaped scraper 5 can peel off the fluorosilicic acid impurities deposited on the bottom wall of the distillation tank 1, preventing the fluorosilicic acid impurities from adhering to the bottom wall of the distillation tank 1.

[0024] The distillation tank 1 is equipped with multiple sets of extension rods 8 equidistantly distributed along a circular trajectory. Each set of extension rods 8 is composed of multiple extension rods 8 arranged in parallel from top to bottom. The end of each set of extension rods 8 near the inner wall of the distillation tank 1 is fixed by a linkage scraper 9. Multiple dispersing rods 10 are fixedly connected to the lowermost extension rod 8 in each set of extension rods 8. The dispersing rods 10 are all located above the arc-shaped scraper 5. When the arc-shaped scraper 5 rotates, the multiple sets of extension rods 8, linkage scraper 9 and dispersing rods 10 rotate in the opposite direction.

[0025] During rotation, the linkage scraper 9 cleans the inner wall of the distillation tank 1, effectively preventing fluorosilicic acid deposits from adhering to the inner wall. Meanwhile, the dispersing rod 10, located below it, moves in the opposite direction to the arc-shaped scraper 5. Therefore, a shearing force is generated between the dispersing rod 10 and the arc-shaped scraper 5, shearing the fluorosilicic acid deposits and reducing their volume.

[0026] Specifically, the sealing cover 2 has a partition 19 inside, and the drive shaft 3 is rotatably mounted to the partition 19. The top end of the drive shaft 3 extends through the sealing cover 2 and above it. The sealing cover 2 has a drive motor 20 connected to the drive shaft 3. The drive motor 20 provides power for the operation of the drive shaft 3, so that the drive shaft 3, the connecting rod 4, and the arc-shaped scraper 5 can rotate synchronously.

[0027] like Figure 3 , Figure 4 As shown, a drive gear 11 is mounted on the drive shaft 3, located above the partition 19. A first linkage gear 12, at the same horizontal plane, is meshed with the drive gear 11. The first linkage gear 12 is connected to a second linkage gear 14 via a synchronous shaft 13, located below the first linkage gear 12. The synchronous shaft 13 is mounted to the side wall of the sealing cover 2 via a support frame 17. Therefore, when the drive shaft 3 and drive gear 11 rotate synchronously, the first linkage gear 12, synchronous shaft 13, and second linkage gear 14 all rotate in opposite directions, generating a driving force opposite to that of the drive shaft 3 and the arc-shaped scraper 5.

[0028] like Figure 3 , Figure 4 As shown, multiple sets of extension rods 8 are distributed around the outside of the drive shaft 3, and the end of each set of extension rods 8 near the drive shaft 3 is fixed by a positioning vertical rod 7. The top ends of the multiple positioning vertical rods 7 distributed around the outside of the drive shaft 3 are fixed by a drive sleeve 6. The drive sleeve 6 is located outside the drive shaft 3. Therefore, the rotation of the drive sleeve 6 can cause the multiple positioning vertical rods 7, the multiple sets of extension rods 8, the multiple linkage scrapers 9, and the multiple sets of dispersing rods 10 to rotate synchronously. To maintain the stability of the drive sleeve 6 and the components connected to it, in this utility model, the drive sleeve 6 is rotatably mounted with the partition plate 19.

[0029] like Figure 3-5 As shown, a guide gear ring 15 is fixedly connected to the top of the drive sleeve 6 via a positioning bracket 16. The guide gear ring 15 is rotatably mounted on the upper surface of the partition plate 19. The second linkage gear 14 is located inside the guide gear ring 15 and meshes with it. When the first linkage gear 12, the synchronous shaft 13 and the second linkage gear 14 rotate synchronously, the guide gear ring 15, the positioning bracket 16 and the drive sleeve 6 rotate in the same direction.

[0030] Therefore, the multiple positioning vertical rods 7, multiple extension rods 8, multiple linkage scrapers 9, and multiple dispersing rods 10, which are fixedly connected to the drive sleeve 6, can rotate in the opposite direction to the drive shaft 3. The dispersing rods 10 move in the opposite direction to the arc-shaped scraper 5. After the arc-shaped scraper 5 rotates and cleans the fluorosilicic acid deposits on the inner wall of the distillation tank 1, the dispersing rods 10, which rotate in the opposite direction to it, can form a shearing force to shear the fluorosilicic acid deposits, reduce the volume of the deposits, and prevent the deposits from accumulating on the bottom wall of the distillation tank 1. This effectively prevents the fluorosilicic acid deposits from contaminating the distillation tank 1 and the discharge pipe, improves the cleaning effect, and facilitates subsequent comprehensive cleaning operations on the distillation tank 1.

[0031] like Figure 1 , Figure 2 As shown, in order to facilitate the discharge of hydrofluoric acid gas generated during the distillation process, a steam output pipe 18 is provided on the sealing cover 2 in this invention. The steam output pipe 18 extends through the partition 19 to the inside of the distillation tank 1. The hydrofluoric acid gas vaporized during the distillation process does not pass through the various components above the partition 19, but is directly discharged to the outside of the distillation tank 1 through the steam output pipe 18.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydrofluoric acid distillation apparatus, comprising a distillation tank (1) and a sealing cap (2) disposed on its top, characterized in that: The distillation tank (1) is equipped with a drive shaft (3). The bottom end of the drive shaft (3) is fixedly connected to an arc-shaped scraper (5) by multiple connecting rods (4) that are equidistantly distributed along the circumferential trajectory. As the drive shaft (3) rotates, the arc-shaped scraper (5) rotates along the bottom wall of the distillation tank (1). The distillation tank (1) is provided with multiple sets of extension rods (8) equidistantly distributed along a circular trajectory. Each set of extension rods (8) is composed of multiple extension rods (8) distributed in parallel from top to bottom. The end of each set of extension rods (8) near the inner side wall of the distillation tank (1) is fixed by a linkage scraper (9). Multiple dispersing rods (10) are fixedly connected to the lowest extension rod (8) in each set of extension rods (8). The dispersing rods (10) are all located above the arc-shaped scraper (5). When the arc-shaped scraper (5) rotates, the multiple sets of extension rods (8), linkage scraper (9) and dispersing rods (10) rotate in the opposite direction.

2. The hydrofluoric acid distillation apparatus according to claim 1, characterized in that: The sealing cover (2) is provided with a partition (19), the drive shaft (3) is rotatably mounted with the partition (19), and the top end of the drive shaft (3) extends through the sealing cover (2) to its top. The sealing cover (2) is provided with a drive motor (20) connected to the drive shaft (3) on its outside.

3. The hydrofluoric acid distillation apparatus according to claim 2, characterized in that: The drive shaft (3) is provided with a drive gear (11), which is located above the partition (19). The drive gear (11) is meshed with a first linkage gear (12) that is on the same horizontal plane as the drive gear (11). The first linkage gear (12) is connected to a second linkage gear (14) through a synchronous shaft (13). The second linkage gear (14) is located below the first linkage gear (12). The synchronous shaft (13) is installed on the side wall of the sealing cover (2) through a support frame (17). When the drive shaft (3) and the drive gear (11) rotate synchronously, the first linkage gear (12), the synchronous shaft (13) and the second linkage gear (14) all rotate in opposite directions.

4. The hydrofluoric acid distillation apparatus according to claim 3, characterized in that: Multiple sets of extension rods (8) are distributed around the outside of the drive shaft (3), and the end of each set of extension rods (8) near the drive shaft (3) is fixed by a positioning vertical rod (7). The top ends of multiple positioning vertical rods (7) distributed around the outside of the drive shaft (3) are fixed by a drive sleeve (6). The drive sleeve (6) is located outside the drive shaft (3), and the drive sleeve (6) is rotatably installed with the partition plate (19).

5. The hydrofluoric acid distillation apparatus according to claim 4, characterized in that: The top of the drive sleeve (6) is fixedly connected to a guide gear ring (15) via a positioning bracket (16). The guide gear ring (15) is rotatably mounted on the upper surface of the partition plate (19). The second linkage gear (14) is located inside the guide gear ring (15) and meshes with it. When the first linkage gear (12), the synchronous shaft (13) and the second linkage gear (14) rotate synchronously, the guide gear ring (15), the positioning bracket (16) and the drive sleeve (6) rotate in the same direction.

6. The hydrofluoric acid distillation apparatus according to claim 2, characterized in that: The sealing cover (2) is provided with a steam output pipe (18), which extends through the partition (19) to the inside of the distillation tank (1).

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