Silicon tetrafluoride gas absorption device in the production of hydrofluoric acid from fluorosilicic acid

Abstract

This invention relates to a silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid. The device includes a housing, within which is an absorption cylinder extending horizontally along its axis. One end of the absorption cylinder is fixedly connected to an inlet pipe, and the other end is rotatably mounted to a liquid inlet pipe via a bearing. The housing is equipped with a drive motor for rotating the inlet pipe and an inlet structure for introducing silicon tetrafluoride gas into the inlet pipe. The end of the liquid inlet pipe away from the absorption cylinder extends out of the housing and is sealed and fixedly connected to it. A suction pipe is located inside the liquid inlet pipe, with its inner end extending to the lower side of the absorption cylinder. The outer wall of the absorption cylinder has several filter holes, each hinged with a sealing cap. A torsion spring on the hinge shaft of the sealing cap keeps it sealed to the filter holes. The housing also includes a gas supply pipe and a gas extraction pipe. Compared to existing technologies, this invention offers better absorption of silicon tetrafluoride and better separation of silica hydrates.

Description

Technical Field

[0001] This invention belongs to the field of fluorosilicic acid to hydrofluoric acid technology, specifically relating to a silicon tetrafluoride gas absorption device in the production of hydrofluoric acid from fluorosilicic acid. Background Technology

[0002] Currently, high-purity hydrofluoric acid is mainly produced by reacting fluorite with concentrated sulfuric acid. However, fluorite is a non-renewable resource with limited reserves, making the search for new fluorine resources urgent. Fluorosilicic acid mainly comes from byproducts of the phosphate fertilizer and anhydrous hydrogen fluoride industries. The current main achievements in the development and utilization of fluorosilicic acid are the production of low-value-added cryolite and aluminum fluoride. The preparation of high-quality, high-value-added hydrofluoric acid is still in the technological development stage.

[0003] US Patent 3218128A discloses a method for producing hydrofluoric acid from fluorosilicic acid. This method mainly includes the following steps: fluorosilicic acid is concentrated to obtain concentrated fluorosilicic acid of a certain concentration; concentrated sulfuric acid dehydrates and decomposes the fluorosilicic acid, releasing silicon tetrafluoride gas; HF is retained in a relatively dilute sulfuric acid solution; the concentrated acid solution after the reaction is purged with a condensable inert gas to release HF, thus producing hydrofluoric acid. The released silicon tetrafluoride gas enters an absorption device for absorption, during which a large amount of silica hydrate is generated. Improving the absorption effect of silicon tetrafluoride and the separation effect of silica hydrate are key design considerations for the absorption device. Chinese Utility Model Patent CN213375860U discloses a silicon tetrafluoride gas absorption device. While this device has a good absorption effect on silicon tetrafluoride gas, its separation effect on silica hydrate is poor. To address the shortcomings of the prior art, it is necessary to provide a silicon tetrafluoride absorption device with good silicon tetrafluoride absorption and silica hydrate separation effects. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides a silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid.

[0005] The technical solution of the silicon tetrafluoride gas absorption device in the production of hydrofluoric acid from fluorosilicic acid according to the present invention is as follows:

[0006] A silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid includes a housing. An absorption cylinder with its axis extending horizontally is located inside the housing. One end of the absorption cylinder is fixedly connected to an inlet pipe, and the other end is rotatably mounted to a liquid inlet pipe via a bearing. The housing is equipped with a drive motor for rotating the inlet pipe. The housing also has an inlet structure for introducing silicon tetrafluoride gas into the inlet pipe. The end of the liquid inlet pipe away from the absorption cylinder extends out of the housing and is sealed and fixedly connected to it. A suction pipe is located inside the liquid inlet pipe, with its inner end extending to the lower side of the absorption cylinder. The outer wall of the absorption cylinder has several filter holes, and a sealing cap is hinged to each filter hole. A torsion spring is mounted on the hinge shaft of the sealing cap to keep it sealing the filter holes. The housing also has a gas supply pipe and a gas extraction pipe.

[0007] Furthermore, one end of the air inlet pipe extends into the absorption cylinder, and the air inlet pipe is provided with a plurality of branch pipes arranged radially along the air inlet pipe, and the branch pipes are provided with a plurality of air outlet holes.

[0008] Furthermore, the end of the air inlet pipe away from the absorption cylinder extends out of the outer side of the housing and is rotatably mounted on the housing via a rotating shaft. The housing is provided with an air inlet cover covering the air inlet pipe. The drive motor is fixedly connected to the air inlet cover. The output shaft of the drive motor is connected to the air inlet pipe via a coupling. An air inlet hole is provided on the outer wall of the air inlet pipe located inside the air inlet cover. A silicon tetrafluoride tube is provided on the air inlet cover.

[0009] Furthermore, the outer edge of the filter hole is provided with a step for blocking the sealing cap inward.

[0010] Furthermore, the outer end of the inlet pipe is sealed, and the suction pipe is sealed and fixedly connected to the sealed end of the inlet pipe. A water pipe is provided on the inlet pipe located outside the housing. A first shut-off valve is provided on the water pipe, and a second shut-off valve is provided on the suction pipe.

[0011] Furthermore, the lower end of the housing is provided with a support leg, the support leg near the liquid inlet pipe is hinged to the housing, and the support leg near the air inlet pipe is provided with a telescopic cylinder that drives the housing to rotate around the hinge axis.

[0012] Furthermore, the housing includes a body and a cover plate. The cover plate has a guide groove extending horizontally with one end connected to the outside. The other end of the guide groove is connected to the inside of the housing through an air passage provided in the cover plate. The cover plate has a vertical groove connected to the middle of the guide groove. The upper side of the body has a groove connected to the vertical groove. The lower end of the groove has horizontally extending locking holes on both sides. The vertical groove has a locking claw. The lower end of the locking claw extends to the lower end of the groove. The lower end of the locking claw has a claw body at both ends. The upper end of the locking claw has a first horizontal rod and a second horizontal rod on both sides. The end of the first horizontal rod has a first sealing plate, and the end of the second horizontal rod has a second sealing plate. The two sides of the locking claw and the groove wall of the vertical groove are respectively provided with return springs.

[0013] Furthermore, a sealing gasket is provided between the body and the cover plate, and the claw is provided with an inclined surface that abuts against the transition position of the groove and the card hole.

[0014] This invention provides a silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid, the advantages of which are:

[0015] Silicon tetrafluoride gas is introduced into the inlet pipe through the inlet structure and into the absorption cylinder. Water is introduced into the absorption cylinder through the liquid inlet pipe. The drive motor drives the absorption cylinder to rotate, and the liquid tumbles inside the absorption cylinder, increasing the contact opportunity with the gas and improving the absorption effect and efficiency of silicon tetrafluoride. When silicon tetrafluoride gas and water are added to the absorption cylinder, gas is introduced into the shell through the gas supply pipe, creating high pressure inside the shell on the outside of the absorption cylinder. The gas presses the sealing cap tightly against the baffle, preventing the sealing cap from opening during the tumbling of the absorption cylinder and causing problems with the liquid outside. After absorption is complete, the suction pipe draws the pressure inside the shell to negative pressure, the sealing cap opens, and the liquid inside the rotating absorption cylinder flows out from the filter holes under the action of negative pressure. After the liquid flows out, the silica hydrate in the absorption cylinder is extracted through the suction pipe. Compared with the prior art, the silicon tetrafluoride gas absorption device in the production of hydrofluoric acid from fluorosilicic acid of the present invention has better absorption effect on silicon tetrafluoride and better separation effect on silica hydrate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the silicon tetrafluoride gas absorption device in the production of hydrofluoric acid from fluorosilicic acid according to an embodiment of the present invention.

[0017] Figure 2 Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 Figure 1 Enlarged view of point B in the middle;

[0019] Figure 4 Figure 1 Enlarged view of point C in the middle;

[0020] Figure 5 This is a schematic diagram of the silicon tetrafluoride gas absorption device in the production of hydrofluoric acid from fluorosilicic acid according to an embodiment of the present invention.

[0021] Figure 6 This is a diagram showing the connection relationship between the main body and the cover plate in the silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid according to an embodiment of the present invention.

[0022] Figure 7 yes Figure 6 Enlarged view of point D in the middle;

[0023] In the diagram: 1. Shell; 2. Support leg; 3. Liquid outlet pipe; 4. Control valve; 5. Air supply pipe; 6. Third shut-off valve; 7. Suction pipe; 8. Fourth shut-off valve; 9. Absorption cylinder; 10. Filter hole; 11. Sealing cover; 12. Step; 13. Air inlet pipe; 14. Branch pipe; 15. Air outlet; 16. Air inlet; 17. Air inlet hood; 18. Drive motor; 19. Coupling; 20. Silicon tetroxide tube; 21. Valve; 22. Liquid inlet pipe; 23. Suction. 24. Water pipe; 25. First shut-off valve; 26. Second shut-off valve; 27. Upper hinge lug; 28. Lower hinge lug; 29. ​​Telescopic cylinder; 30. Body; 31. Cover plate; 32. Guide groove; 33. Air passage; 34. Sealing gasket; 35. Vertical groove; 36. Groove; 37. Locking hole; 38. Locking claw; 39. Claw body; 40. First horizontal bar; 41. First sealing plate; 42. Second horizontal bar; 43. Second sealing plate; 44. Return spring. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0025] Specific embodiments of the silicon tetrafluoride gas absorption device in the production of hydrofluoric acid from fluorosilicic acid according to the present invention are as follows: Figures 1 to 4 As shown, the device includes a housing 1, which is a rectangular structure. A liquid outlet pipe 3 is fixedly connected to one side of the lower end of the housing 1, and a control valve 4 is installed on the liquid outlet pipe 3. Inside the housing 1, there is an absorption cylinder 9, which is a cylindrical structure with both ends sealed. The axis of the absorption cylinder 9 extends horizontally.

[0026] The outer wall of the absorption cylinder 9 has several rings of filter holes 10, each ring of filter holes 10 is evenly spaced around the circumference of the absorption cylinder 9, and the rings of filter holes 10 are evenly spaced along the axial direction of the absorption cylinder 9. Each filter hole 10 is hinged with a sealing cap 11, one end of which is hinged to the inner wall of the filter hole 10. The outer edge of the filter hole 10 has a step 12 that stops the sealing cap 11. A torsion spring is installed on the hinge axis between the sealing cap 11 and the filter hole 10. The torsion spring can keep the sealing cap 11 pressed against the step 12, that is, the sealing cap 11 seals the filter hole 10.

[0027] The absorption cylinder 9 has an inlet pipe 13 coaxial with it. The end of the inlet pipe 13 extends outward from the outer side of the absorption cylinder 9 and outward from the outer side of the housing 1, and is rotatably connected to the housing 1 via a bearing. The inlet pipe 13 is sealed and fixed to the absorption cylinder 9, with one end of the inlet pipe 13 inside the absorption cylinder 9 sealed. Several rings of branch pipes 14 are fixedly connected to the outer wall of the inlet pipe 13. Each ring of branch pipes 14 is evenly spaced circumferentially along the inlet pipe 13, and the rings of branch pipes 14 are evenly spaced axially along the inlet pipe 13. Each branch pipe 14 has several outlet holes 15, through which silicon tetrafluoride gas in the inlet pipe 13 enters the absorption cylinder 9. The branch pipes 14 also agitate the liquid inside the absorption cylinder 9, further ensuring sufficient contact between the liquid and gas.

[0028] The intake pipe 13 has an opening at one end located outside the housing 1. An intake shroud 17, which covers the intake pipe 13, is sealed and fixedly connected to the housing 1. A silicon tetrafluoride tube 20 is fixedly connected to the intake shroud 17, and a valve 21 is fixedly connected to the silicon tetrafluoride tube 20. A drive motor 18 is fixedly connected to the intake shroud 17, and the output shaft of the drive motor 18 extends into the intake shroud 17. The output shaft of the drive motor 18 is fixedly connected to the intake pipe 13 via a coupling 19. An intake hole 16 is provided on the outer wall of the intake pipe 13 located inside the intake shroud 17. Silicon tetrafluoride gas enters the intake shroud 17 through the silicon tetrafluoride tube 20, and the silicon tetrafluoride gas inside the intake shroud 17 enters the intake pipe 13 through the intake hole 16. The silicon tetrafluoride gas inside the intake pipe 13 enters the absorption cylinder 9 through the outlet hole 15 on the branch pipe 14.

[0029] An inlet pipe 22 is rotatably mounted on the end of the absorption cylinder 9 away from the air inlet pipe 13 via a bearing. The inlet pipe 22 is coaxially arranged with the air inlet pipe 13. One end of the inlet pipe 22 extends into the interior of the absorption cylinder 9, and the other end extends out of the shell 1. The inlet pipe 22 is sealed and fixedly connected to the shell 1. The end of the inlet pipe 22 inside the absorption cylinder 9 is open, and the end of the inlet pipe 22 outside the shell 1 is sealed. A water pipe 24 is fixedly connected to the lower side of the end of the inlet pipe 22 outside the shell 1. The water pipe 24 communicates with the inlet pipe 22, and a first shut-off valve 25 is fixedly connected to the water pipe 24. A suction pipe 23 is fixedly connected to one end of the inlet pipe 22 located outside the shell 1. The suction pipe 23 is L-shaped, and its horizontal section is fixedly connected to the sealed end of the inlet pipe 22. The horizontal section of the suction pipe 23 is coaxially arranged with the inlet pipe 22, and its vertical section extends downward to near the inner wall of the absorption cylinder 9. A second shut-off valve 26 is fixedly connected to the suction pipe 23, which can control the opening and closing of the suction pipe 23. Water in the water pipe 24 can enter the absorption cylinder 9 through the annulus between the inlet pipe 22 and the suction pipe 23.

[0030] An air supply pipe 5 is fixedly connected to the upper side of the housing 1, and a third shut-off valve 6 is installed on the air supply pipe 5. An air extraction pipe 7 is fixedly connected to the upper side of the housing 1, and a fourth shut-off valve 8 is installed on the air extraction pipe 7. Four support legs 2 are fixedly connected to the lower end of the housing 1, and the four support legs 2 are respectively fixedly connected to the four corners of the lower side of the housing 1.

[0031] In this embodiment, during the production of hydrofluoric acid from fluorosilicic acid, the control valve 4 on the liquid outlet pipe 3 and the fourth shut-off valve 8 on the extraction pipe 7 are closed when the silicon tetrafluoride gas absorption device is in use. The external gas inlet pipe 13 is connected to the gas supply pipe 5. The third shut-off valve 6 is opened to introduce gas into the housing 1, creating a positive pressure inside the housing 1. The gas inside the housing 1 exerts a force on the sealing cover 11 of the absorption cylinder 9, pressing the sealing cover 11 tightly against the step 12, preventing the sealing cover 11 from opening after liquid is introduced into the absorption cylinder 9. The valve 21 on the silicon tetrafluoride pipe 20 is opened to allow gas to enter the gas inlet hood 17. The silicon tetrafluoride gas in the gas inlet hood 17 enters the gas inlet pipe 13 through the gas inlet hole 16, and then enters the absorption cylinder 9 through the gas outlet hole 15 on the branch pipe 14. The first shut-off valve 25 is opened, and water enters the liquid inlet pipe 22 through the water pipe 24, which then enters the absorption cylinder 9. The drive motor 18 is started, driving the absorption cylinder 9 to rotate. The liquid inside the absorption cylinder 9 tumbles, and the silicon tetrafluoride gas ejected from the vent 15 comes into full contact with the liquid, being fully absorbed by the water. After a period of absorption, the suction device is connected to the suction pipe 7, drawing the housing 1 into a negative pressure state. The sealing cover 11 on the absorption cylinder 9 opens under the negative pressure inside the housing 1. During the rotation of the absorption cylinder 9, the liquid inside flows out through the filter holes 10, preventing silica hydrates from clogging the filter holes 10. The liquid outlet in the absorption cylinder 9 opens the control valve 4 on the liquid outlet pipe 3, allowing the liquid to flow out from the liquid outlet pipe 3. The suction device extracts the silica hydrates from the absorption cylinder 9 through the suction pipe 23.

[0032] In some embodiments, such as Figure 5 As shown, two support legs 2 near the inlet pipe 22 are fixedly connected to the upper side of their respective lower hinge ears 28. The lower side of the housing 1 near the inlet pipe 22 has two upper hinge ears 27, each hinged to the lower hinge ears 28. Two support legs 2 near the drive motor 18 support the housing 1. When the lower side of the housing 1 near the drive motor 18 contacts the two support legs 2, the housing 1 is in a horizontal position. A connecting rod is fixedly connected between the two support legs 2 near the drive motor 18. A telescopic cylinder 29 is hinged to the connecting rod. The upper end of the piston rod of the telescopic cylinder 29 is hinged to the lower side of the housing 1. When the piston rod of the telescopic cylinder 29 extends or retracts, it drives the housing 1 to rotate around the hinge axis.

[0033] In this embodiment, when the silicon tetrafluoride gas absorption device is used in the production of hydrofluoric acid from fluorosilicic acid, after the liquid in the absorption cylinder 9 flows out, the telescopic cylinder 29 is activated. The piston rod of the telescopic cylinder 29 extends, driving the housing 1 to rotate around the hinge axis, causing the housing 1 to tilt. Under the action of gravity, the silica hydrate inside the housing 1 slides towards the side closer to the suction pipe 23, which helps the suction pipe 23 to extract the silica hydrate from the absorption cylinder 9.

[0034] In some embodiments, such as Figure 6 , Figure 7 As shown, the housing includes a body 30 and a cover plate 31 disposed on the upper side of the body 30. Both the vent pipe and the extraction pipe are disposed on the cover plate 31. The body 30 and the cover plate 31 are connected by several clamping structures, including clamping claws 38. A guide groove 32 extending horizontally is provided on the cover plate 31. One end of the guide groove 32 communicates with the outside of the cover plate 31, and the other end communicates with the interior of the housing through an air passage 33 disposed within the cover plate 31. A vertical groove 35 extending vertically and communicating with the middle of the guide groove 32 is also provided within the cover plate 31. A recess 36 is located on the upper side of the body 30. When the cover plate 31 covers the body 30, the vertical groove 35 communicates with the recess 36. The lower end of the recess 36 has locking holes 37 extending to both ends, with the recess 36 and the locking holes 37 transitioning at an arc. The clamping claws 38 are located within the vertical groove 35 and the recess 36, and the lower end of the clamping claws 38 has claw bodies 39 that clamp with the locking holes 37 on both sides of the recess 36. The claw body 39 has an inclined surface that abuts against the transition position of the groove 36 and the locking hole 37, so that when the claw body 39 moves into the locking hole 37, it applies an oblique force to the body 30.

[0035] A first horizontal rod 40 and a second horizontal rod 42 are fixedly connected to the upper two sides of the claw 38, respectively. Both the first horizontal rod 40 and the second horizontal rod 42 are located within the guide groove 32. The first horizontal rod 40 extends outward from the cover plate 31, and the second horizontal rod 42 extends inward from the cover plate 31. A first sealing plate 41 that seals and guides the guide groove 32 is fixedly connected to the end of the first horizontal rod 40, and a second sealing plate 43 that seals and guides the guide groove 32 is fixedly connected to the end of the second horizontal rod 42. Return springs 44 are located between the claw 38 and the wall of the vertical groove 35 on both sides. Under the action of the two return springs 44, the claw 38 can be positioned at the center of the vertical groove 35. At this time, the claw body 39 at the lower end of the claw 38 is disengaged from the locking hole 37, and the cover plate 31 can be removed from the body 30.

[0036] In this embodiment, when the silicon tetrafluoride gas absorption device is used in the production of hydrofluoric acid from fluorosilicic acid, gas is introduced into the housing through the gas supply pipe, creating a positive pressure inside the housing. The gas enters the gas passage 33 and pushes the second sealing plate 43 to move along the guide groove 32 towards the outside of the cover plate 31. The claw 38 moves with the second sealing plate 43, compressing the return spring 44. The claw body 39 on one side of the claw 38 enters the locking hole 37, thus locking the cover plate 31 and the body 30. As the pressure inside the housing continues to increase, the pressure on the claw body 39 increases. The inclined surface on the claw body 39 abuts against the transition position between the locking hole 37 and the groove 36, applying an oblique movement to the transition position between the locking hole 37 and the groove 36, causing the cover plate 31 to press the sealing gasket 34 onto the body 30, thereby improving the sealing performance between the body 30 and the cover plate 31. When air is drawn out of the housing through the suction pipe, the housing is under negative pressure. The external air pressure pushes the first sealing plate 41 to move along the guide groove 32 toward the inside of the cover plate 31. The claw 38 moves with the first sealing plate 41, compressing the return spring 44. The claw body 39 on one side of the claw 38 enters the locking hole 37, thus locking the cover plate 31 and the body 30. As the pressure inside the housing continues to increase, the pressure on the claw body 39 increases. The inclined surface on the claw body 39 abuts against the transition position between the locking hole 37 and the groove 36, applying an oblique movement to the transition position between the locking hole 37 and the groove 36, so that the cover plate 31 presses the sealing gasket 34 onto the body 30, improving the sealing performance between the body 30 and the cover plate 31. When the housing is under normal pressure, the claw 38 is in the center of the vertical groove 35 under the action of the two return springs 44. The two claws 39 at the lower end of the claw 38 do not enter the locking hole 37. The cover plate 31 can be opened by moving the cover plate 31 upward, so that the absorption cylinder inside the main body 30 can be repaired, making the maintenance of this invention more convenient and faster.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid, characterized in that, The device includes a housing, within which is an absorption cylinder extending horizontally along its axis. One end of the absorption cylinder is fixedly connected to an air inlet pipe, and the other end is rotatably mounted to a liquid inlet pipe via a bearing. The housing is equipped with a drive motor for rotating the air inlet pipe and an air intake structure for introducing silicon tetrafluoride gas into the air inlet pipe. The end of the liquid inlet pipe away from the absorption cylinder extends out of the housing and is sealed and fixedly connected to the housing. A suction pipe is provided inside the liquid inlet pipe, with its inner end extending to the lower side of the absorption cylinder. The outer wall of the absorption cylinder has several filter holes, and a sealing cap is hinged to each filter hole. A torsion spring is provided on the hinge shaft of the sealing cap to keep the sealing cap sealing the filter hole. The housing is equipped with an air supply pipe and an air extraction pipe.

2. The silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid according to claim 1, characterized in that, One end of the air inlet pipe extends into the absorption cylinder, and the air inlet pipe is provided with a number of branch pipes arranged radially along the air inlet pipe, and the branch pipes are provided with a number of air outlet holes.

3. The silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid according to claim 2, characterized in that, The end of the air inlet pipe away from the absorption cylinder extends out of the outer side of the housing and is rotatably mounted on the housing via a rotating shaft. The housing is provided with an air inlet cover covering the air inlet pipe. The drive motor is fixedly connected to the air inlet cover. The output shaft of the drive motor is connected to the air inlet pipe via a coupling. An air inlet hole is provided on the outer wall of the air inlet pipe located inside the air inlet cover. A silicon tetrafluoride tube is provided on the air inlet cover.

4. The silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid according to claim 1, characterized in that, The outer edge of the filter hole is provided with a step for blocking the sealing cap inward.

5. The silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid according to claim 4, characterized in that, The outer end of the liquid inlet pipe is sealed, and the suction pipe is sealed and fixedly connected to the sealed end of the liquid inlet pipe. A water pipe is provided on the liquid inlet pipe located outside the housing. A first shut-off valve is provided on the water pipe, and a second shut-off valve is provided on the suction pipe.

6. The silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid according to claim 1, characterized in that, The lower end of the housing is provided with a support leg. The support leg near the liquid inlet pipe is hinged to the housing. The support leg near the air inlet pipe is provided with a telescopic cylinder that drives the housing to rotate around the hinge axis.

7. The silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid according to claim 1, characterized in that, The housing includes a body and a cover plate. The cover plate has a guide groove extending horizontally with one end connected to the outside. The other end of the guide groove is connected to the inside of the housing through an air passage provided in the cover plate. The cover plate has a vertical groove connected to the middle of the guide groove. The upper side of the body has a groove connected to the vertical groove. The lower end of the groove has horizontally extending locking holes on both sides. The vertical groove has a locking claw. The lower end of the locking claw extends to the lower end of the groove. The lower end of the locking claw has a claw body at both ends. The upper end of the locking claw has a first horizontal rod and a second horizontal rod on both sides. The end of the first horizontal rod has a first sealing plate, and the end of the second horizontal rod has a second sealing plate. The two sides of the locking claw and the groove wall of the vertical groove are respectively provided with return springs.

8. The silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid according to claim 7, characterized in that, A sealing gasket is provided between the body and the cover plate, and the claw is provided with an inclined surface that abuts against the transition position of the groove and the card hole.

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