A device and process for recycling low-concentration hydrochloric acid resources

Abstract

The present invention provides a device and a process for recycling low-concentration hydrochloric acid resources, belonging to the field of recycling and treatment of low-concentration hydrochloric acid, including a hydrochloric acid mixing tank; a mixing component, the mixing component includes a bushing rotatably connected to the top cover, the bottom of the bushing is fixedly connected with a square pipe, and blade components are respectively arranged on the left and right sides of the square pipe and are equally spaced from top to bottom. The blade component includes a collar rotatably connected to one side wall of the square pipe, and first gears are respectively fixedly connected to the mutually close sides of the outer sides of two adjacent collars; through the arranged mixing component and driving component, the present invention can realize that when the stirring shaft rotates with the uniquely designed square pipe, the internal toothed plate will periodically move up and down, which will drive the stirring shaft and the stirring blades to swing up and down while revolving with the bushing, disturbing the liquid flow direction, avoiding the generation of vortices, and improving the mixing effect between different laminar flows.

Description

Technical Field

[0001] The present invention relates to the technical field of low-concentration hydrochloric acid recovery and treatment, and specifically relates to a device and process for recycling low-concentration hydrochloric acid resources. Background Technique

[0002] During the industrial production process, such as the acidic water vapor containing hydrochloric acid in the chloroethane production process, the conventional disposal method is to directly cool and condense it into dilute hydrochloric acid. Due to its low concentration, its reuse value is low. When the profit of the main product is good, this part of dilute hydrochloric acid is directly disposed of by the acid-base neutralization method, which not only consumes a large amount of resources but also causes serious environmental pollution. Therefore, a device for recycling low-concentration hydrochloric acid resources is needed to recover and treat low-concentration hydrochloric acid.

[0003] The existing common treatment method for low-concentration hydrochloric acid is rectification treatment. Before rectification treatment, salt needs to be added to the dilute hydrochloric acid solution to change the relative volatility of the components, thereby destroying the azeotropic composition of hydrochloric acid and water. Usually, the salt added is calcium chloride. When the dilute hydrochloric acid and calcium chloride solution are mixed, the stirring effect of the traditional stirring device is limited, and the time required for them to be fully mixed is long, and it is difficult to ensure complete mixing, which will affect the subsequent rectification process of the mixed solution and reduce the output of hydrogen chloride gas. Secondly, during the stirring process, since the stirring rod rotates in a fixed-height fixed manner, vortices are easily formed in the solution, further hindering the full mixing of the solution.

[0004] Therefore, we propose a device and process for recycling low-concentration hydrochloric acid resources to solve the problems encountered above. Summary of the Invention

[0005] Aiming at the deficiencies existing in the prior art, the present invention provides a device and process for recycling low-concentration hydrochloric acid resources to solve the problems proposed in the above background technique.

[0006] The object of the present invention can be achieved by the following technical solutions: including a hydrochloric acid mixing tank;

[0007] Mixing assembly, the mixing assembly includes a bushing rotatably connected to the top cover. A square tube is fixedly connected to the bottom of the bushing. Blade assemblies are respectively arranged on the left and right sides of the square tube and are equally spaced from top to bottom. The blade assembly includes a collar rotatably connected to one side wall of the square tube. First gears are fixedly connected to the sides of two adjacent collars that are close to each other. Sealing shells are fixedly connected to the outer sides of the ends of two adjacent collars that are away from each other. A rotating shaft is rotatably connected inside the sealing shell. One end of the rotating shaft is fixedly connected to a stirring shaft. Fixing rings are fixedly connected to the outer side of the stirring shaft and are equally spaced along the axis of the stirring shaft. Stirring blades are fixedly connected to the upper and lower sides of the outer side of the fixing ring. The mixing assembly further includes a fixing rod fixedly connected to the bottom of the square tube. A cross bar is arranged on the fixing rod at the same axis height as the collar. First bevel gears are fixedly connected to the outer side of the end of the cross bar and the outer side of one end of the adjacent rotating shaft. Two adjacent first bevel gears mesh with each other. The mixing assembly further includes a toothed plate slidably connected to the rear side of the square tube. The toothed plate meshes with multiple first gears. A connecting pipe is fixedly connected to the top of the toothed plate. A vertical rod is rotatably connected inside the connecting pipe.

[0008] As a preferred embodiment of the present invention, it further includes a driving assembly. The driving assembly includes a fixing frame fixedly connected to the top of the top cover. A motor is fixedly connected to the top of the fixing frame. The output end of the motor is fixedly connected to a driving shaft. One end of the driving shaft is rotatably connected to the top of the top cover. Second gears are fixedly connected to the outer side of the bottom end of the driving shaft and the outer side of the top of the bushing. The two second gears mesh with each other. A driven shaft is rotatably connected to one side of the fixing frame. Second bevel gears are fixedly connected to the outer side of one end of the driven shaft and the outer side of the driving shaft. The two second bevel gears mesh with each other. A disc is fixedly connected to the other end of the driven shaft. A convex rod is fixedly connected to the front side of the disc. A fixed shaft is fixedly connected to the middle of one side of the fixing frame. A connecting rod is rotatably connected to the fixed shaft. A sliding groove is opened on the connecting rod. The convex rod is movably connected to the inner side of the sliding groove. One end of the connecting rod is fixedly connected to an arc-shaped toothed rack. A rack is slidably connected to the middle of one side of the fixing frame and to the right of the fixed shaft. The rack meshes with the arc-shaped toothed rack. The rack is fixedly connected to the top of the vertical rod.

[0009] As a preferred embodiment of the present invention, feed pipes are respectively arranged on the upper and lower sides of one side of the hydrochloric acid mixing tank. A discharge pipe is arranged at the bottom of the hydrochloric acid mixing tank. A top cover is arranged at the top of the hydrochloric acid mixing tank.

[0010] As a preferred embodiment of the present invention, an analysis tower is arranged below the hydrochloric acid mixing tank. The discharge pipe is connected to the analysis tower through a feed pump. A concentrated acid tank is arranged below the analysis tower. The analysis tower is connected to the concentrated acid tank through a pipeline.

[0011] As a preferred embodiment of the present invention, opening and closing valves are arranged on both of the two feed pipes, the discharge pipe and the connecting pipelines.

[0012] As a preferred embodiment of the present invention, there is an included angle between the central axis of the fixed ring and the central axis of the adjacent stirring shaft, and the shape of the stirring blade is spiral.

[0013] As a preferred embodiment of the present invention, a cross frame is fixedly connected between the left and right inner walls of the square tube, the cross frame is fixedly connected to the fixed rod, and the cross frames are equally spaced from top to bottom.

[0014] As a preferred embodiment of the present invention, symmetric arc grooves are formed on the disc, and the radius of the arc groove to the center of the disc is less than the distance from the central axis of the convex rod to the center of the disc.

[0015] In a second aspect, the present invention provides a process for recycling low-concentration hydrochloric acid resources, comprising the following steps:

[0016] Step 1: First, open the opening and closing valve on the feed pipe. The two feed pipes respectively pour low-concentration hydrochloric acid and calcium chloride solution into the hydrochloric acid mixing tank through an external pump. After pouring a certain amount, close the opening and closing valve on the feed pipe and stop the pump from working;

[0017] Step 2: Start the motor on the hydrochloric acid mixing tank. The motor drives the driving shaft to rotate, and then synchronously drives the second gear and the second bevel gear thereon to rotate. The two second gears drive the sleeve on the other second gear to rotate through meshing with each other. The sleeve then drives the square tube, the stirring shaft, and through the connecting piece drives the stirring blade to rotate around the rotation center of the sleeve. When the square tube rotates, the toothed plate and the connecting pipe rotate synchronously with the square tube around the rotation center of the sleeve. At this time, the connecting pipe rotates around the vertical rod. At the same time, the rotating second bevel gear meshes with another second bevel gear to drive the driven shaft to rotate. When the driven shaft rotates, it will drive the disc to rotate. When the disc rotates, it will synchronously drive the convex rod thereon to move in the chute, and then can push the connecting rod and the arc-shaped tooth rack to swing around the fixed shaft. At the same time, since the arc-shaped tooth rack and the rack are meshed with each other, the arc-shaped tooth rack moving in a swinging manner will drive the rack and the vertical rod to move up and down through meshing. The bottom end of the vertically reciprocating vertical rod will drive the lower toothed plate to move up and down through the connection with the connecting pipe. When the toothed plate moves up and down, it will mesh with a plurality of first gears, thereby driving the first gears to also rotate reciprocally. The reciprocally rotating first gears will then drive the sealing shell to rotate reciprocally through the collar. The reciprocally rotating sealing shell will drive the stirring shaft and the stirring blade to swing around the rotation center of the collar through the inner rotating shaft. When the rotating shaft swings around the collar, since the cross bar is fixedly connected to the fixed rod and the square tube, when the rotating shaft swings, the central axis of the cross bar does not deflect relative to the adjacent collar. Therefore, at this time, the first bevel gear on the rotating shaft will rotate meshingly around the first bevel gear on the cross bar, thereby driving the rotating shaft and the stirring shaft to rotate reciprocally around the rotation center of the rotating shaft, and further driving multiple groups of stirring blades thereon to rotate reciprocally around the rotating shaft, accelerating the full mixing of the hydrochloric acid and calcium chloride solution in the hydrochloric acid mixing tank;

[0018] Step 3: After the mixture in the hydrochloric acid mixing tank has been mixed for a certain period of time, turn off the motor on the hydrochloric acid mixing tank, open the opening and closing valve on the discharge pipe, start the feed pump, and pump the mixed solution from the hydrochloric acid mixing tank into the analytical tower for rectification. During rectification, hydrogen chloride gas precipitates from the solution and is absorbed by the dilute hydrochloric acid solution at the top of the analytical tower to form concentrated hydrochloric acid. Subsequently, the formed concentrated hydrochloric acid is pumped into the concentrated acid tank for storage, completing the recovery operation of low-concentration hydrochloric acid.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. By setting the mixing component and the driving component, when the stirring shaft rotates with the uniquely designed square pipe, the internal toothed plate will perform a periodic lifting motion, which will drive the stirring shaft and the stirring blades to perform an up-and-down swinging motion while revolving with the sleeve, disrupting the liquid flow direction, avoiding the generation of vortices, and improving the mixing effect between different laminar flows.

[0021] 2. By setting the mixing component and the driving component, while the stirring shaft is performing a swinging motion, the stirring shaft can perform a reciprocating rotational motion in another direction along the central axis of the rotating shaft. Through the external stirring blades, the stirring and mixing area is further increased, further improving the anti-rotation effect and the mixing effect, and contributing to increasing the hydrogen chloride production during subsequent rectification. Description of the Drawings

[0022] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with the drawings.

[0023] Figure 1 is the three-dimensional structure diagram of the present invention;

[0024] Figure 2 is the partial three-dimensional structure diagram of the present invention;

[0025] Figure 3 is one of the partial sectional three-dimensional structure diagrams of the present invention;

[0026] Figure 4 is Figure 2 the enlarged schematic diagram of part A shown in;

[0027] Figure 5 is Figure 3 the enlarged schematic diagram of part B shown in;

[0028] Figure 6 is the process schematic diagram of the present invention.

[0029] In the figure: 1, hydrochloric acid mixing tank; 2, feed pipe; 3, discharge pipe; 4, top cover; 5, shaft sleeve; 6, square pipe; 7, shaft collar; 8, first gear; 9, sealing shell; 10, rotating shaft; 11, stirring shaft; 12, fixing ring; 13, stirring blade; 14, fixing rod; 15, cross bar; 16, first bevel gear; 17, toothed plate; 18, connecting pipe; 19, vertical rod; 20, fixing bracket; 21, motor; 22, driving shaft; 23, second gear; 24, driven shaft; 25, second bevel gear; 26, disc; 27, convex rod; 28, fixed shaft; 29, connecting rod; 30, chute; 31, arc-shaped tooth rack; 32, rack; 33, analytical tower; 34, concentrated acid tank; 35, cross frame; 36, arc-shaped groove. Detailed implementation mode

[0030] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figure 1 and Figure 6 As shown, a low-concentration hydrochloric acid resource recovery and utilization device includes a hydrochloric acid mixing tank 1;

[0032] As an implementation method in this embodiment, as Figures 1 - 3 and Figure 5As shown in the figure, a mixing component, the mixing component includes a bushing 5 rotatably connected to the top cover 4, the bottom of the bushing 5 is fixedly connected with a square tube 6, blade assemblies are respectively arranged on the left and right sides of the square tube 6 and are equally spaced from top to bottom. The blade assembly includes a collar 7 rotatably connected to one side wall of the square tube 6. On the side where the outer sides of two adjacent collars 7 are close to each other, a first gear 8 is fixedly connected respectively. On the outer sides of the ends of two adjacent collars 7 that are far away from each other, a sealing shell 9 is fixedly connected. A rotating shaft 10 is rotatably connected in the sealing shell 9. One end of the rotating shaft 10 is fixedly connected with a stirring shaft 11. On the outer side of the stirring shaft 11, fixing rings 12 are fixedly connected and are equally spaced along the axis direction of the stirring shaft 11. On the upper and lower sides of the outer side of the fixing ring 12, stirring blades 13 are fixedly connected. The mixing component further includes a fixing rod 14 fixedly connected to the bottom of the square tube 6. On the fixing rod 14, at the same axis height as the collar 7, a cross bar 15 is arranged. On the outer side of the end of the cross bar 15 and on the outer side of one end of the adjacent rotating shaft 10, a first bevel gear 16 is fixedly connected respectively. Two adjacent first bevel gears 16 are meshed with each other. The mixing component further includes a toothed plate 17 slidably connected to the rear side of the square tube 6. The toothed plate 17 is meshed with a plurality of first gears 8. The top of the toothed plate 17 is fixedly connected with a connecting pipe 18. A vertical rod 19 is rotatably connected in the connecting pipe 18. The square tube 6 can make each installation surface a plane, which is convenient for the installation of the sealing shell 9 and the sealing between the contact surfaces. The collar 7 is used to drive the sealing shell 9 to swing and rotate. By lifting the toothed plate 17, the first gear 8 at one end of its outer side is driven to rotate, and then the sealing shell 9 is driven to rotate. When the sealing shell 9 rotates, the stirring shaft 11 can be driven to rotate through the rotating shaft 10. At the same time, relative rotation can also occur between the rotating shaft 10 and the sealing shell 9 to provide feasibility for the self-rotation of the stirring shaft 11. The fixing rod 14 and the cross bar 15 are fixedly installed on the square tube 6, which can ensure that they can only rotate with the square tube 6 and will not rotate with the first gear 8. When the first gear 8 drives the sealing shell 9 to rotate, the rotating shaft 10 will rotate with the sealing shell 9. When it rotates, the first bevel gear 16 on the outer side of one end of it will be meshed with the first bevel gear 16 on the fixed cross bar 15, and then the rotating shaft 10 will be driven to rotate self, and then the stirring shaft 11 and the stirring blades 13 on its outer side will follow, and then the multi-angle rotation of the stirring blades 13 can be realized, so that the anti-rotation effect and the mixing effect can be further improved, which is helpful to increase the production of hydrogen chloride during subsequent rectification.

[0033] As an implementation manner in this embodiment, as Figures 1 - 5As shown in the figure, it further includes a driving component. The driving component includes a fixing frame 20 fixedly connected to the top of the top cover 4. The top of the fixing frame 20 is fixedly connected with a motor 21. The output end of the motor 21 is fixedly connected with a driving shaft 22. One end of the driving shaft 22 is rotatably connected to the top of the top cover 4. Both the outer side of the bottom end of the driving shaft 22 and the outer top of the shaft sleeve 5 are fixedly connected with a second gear 23. The two second gears 23 are meshed with each other. One side of the fixing frame 20 is rotatably connected with a driven shaft 24. Both the outer side of one end of the driven shaft 24 and the outer side of the driving shaft 22 are fixedly connected with a second bevel gear 25. The two second bevel gears 25 are meshed with each other. The other end of the driven shaft 24 is fixedly connected with a disc 26. The front side of the disc 26 is fixedly connected with a convex rod 27. The middle of one side of the fixing frame 20 is fixedly connected with a fixed shaft 28. A connecting rod 29 is rotatably connected to the fixed shaft 28. A sliding groove 30 is formed in the connecting rod 29. The convex rod 27 is movably connected to the inner side of the sliding groove 30. One end of the connecting rod 29 is fixedly connected with an arc-shaped tooth rack 31. A rack 32 is slidably connected to the middle of one side of the fixing frame 20 and to the right of the fixed shaft 28. The rack 32 is meshed with the arc-shaped tooth rack 31. The rack 32 is fixedly connected to the top of the vertical rod 19. By means of the motor 21, two synchronous movements can be realized simultaneously. One is that the second gear 23 outside the driving shaft 22 meshes with another second gear 23 to drive the shaft sleeve 5 and the square pipe 6 to rotate unidirectionally; the other is that the second bevel gears 25 mesh with each other to drive the disc 26 to rotate unidirectionally. The convex rod 27 on its outer side cooperates with the sliding groove 30 on the connecting rod 29 to drive the connecting rod 29 to swing reciprocally around the fixed shaft 28, thereby realizing the reciprocating lifting of the rack 32. Then, through the cooperation of the vertical rod 19 and the connecting pipe 18, the toothed plate 17 is driven to move up and down, so as to facilitate the driving of the two synchronous movements.

[0034] In this embodiment, as Figure 1 and Figure 5 shown, on the upper and lower sides of one side of the hydrochloric acid mixing tank 1, a feed pipe 2 is respectively arranged. The bottom of the hydrochloric acid mixing tank 1 is provided with a discharge pipe 3. The top of the hydrochloric acid mixing tank 1 is provided with a top cover 4. The feed pipe 2 and the discharge pipe 3 are respectively used for the introduction of raw materials and the discharge of the mixed hydrochloric acid mixture, facilitating the loading and unloading process.

[0035] In this embodiment, as Figure 1 and Figure 5 shown, an analysis tower 33 is arranged below the hydrochloric acid mixing tank 1. The discharge pipe 3 is connected to the analysis tower 33 through a feed pump. A concentrated acid tank 34 is arranged below the analysis tower 33. The analysis tower 33 is connected to the concentrated acid tank 34 through a pipeline. The analysis tower 33 is used for rectifying the low-concentration hydrochloric acid solution mixture. The rectified hydrogen chloride gas is absorbed by the dilute hydrochloric acid solution in the analysis tower 33 until it becomes a concentrated hydrochloric acid solution. Then, the concentrated hydrochloric acid solution is pumped into the concentrated acid tank 34 for storage, completing the concentration improvement process of the low-concentration hydrochloric acid.

[0036] In this embodiment, as Figure 1 shown, opening and closing valves are provided on both of the two feed pipes 2 and the discharge pipe 3 and the connecting pipeline. The opening and closing valves are used to control the opening and closing of the feed pipe 2 and the discharge pipe 3 respectively, facilitating the control of the timing of loading and unloading.

[0037] In this embodiment, as Figure 2 , Figure 3 and Figure 5 shown, there is an included angle between the central axis of the fixed ring 12 and the central axis of the adjacent stirring shaft 11. The shape of the stirring blade 13 is spiral. Setting the included angle enables the stirring blade 13 to have a certain included angle with the central axis of the stirring shaft 11 after installation, increasing the rotatable area of the stirring blade 13 and improving the mixing effect of different liquids during stirring.

[0038] In this embodiment, as Figure 2 and Figure 5 shown, a cross frame 35 is fixedly connected between the left and right inner walls of the square pipe 6. The cross frame 35 is fixedly connected to the fixed rod 14. The cross frames 35 are equidistantly distributed from top to bottom, and multiple groups of cross frames 35 are provided for supporting the fixed rod 14 and improving its stability.

[0039] In this embodiment, as Figure 2 and Figure 4 shown, symmetric arc-shaped grooves 36 are formed on the disc 26. The radius of the arc-shaped grooves 36 to the center of the disc 26 is less than the distance from the central axis of the convex rod 27 to the center of the disc 26. The arc-shaped grooves 36 are used to reduce the material consumption and lower the manufacturing cost.

[0040] The process of the low-concentration hydrochloric acid resource recycling and utilization device includes the following steps:

[0041] Step 1: First, open the opening and closing valve on the feed pipe 2. The two feed pipes 2 respectively pour low-concentration hydrochloric acid and calcium chloride solution into the hydrochloric acid mixing tank 1 through an external pump. After pouring a certain amount, close the opening and closing valve on the feed pipe 2 and stop the pump from working;

[0042] Step 2: Start the motor 21 on the hydrochloric acid mixing tank 1. The motor 21 drives the rotation of the driving shaft 22, and then synchronously drives the rotation of the second gear 23 and the second bevel gear 25 thereon. The two second gears 23 drive the rotation of the bushing 5 on another second gear 23 through meshing with each other. The bushing 5 then drives the square tube 6, the stirring shaft 11, and through the connecting piece, drives the stirring blades 13 to rotate around the rotation center of the bushing 5. When the square tube 6 rotates, the toothed plate 17 and the connecting pipe 18 rotate synchronously with the square tube 6 around the rotation center of the bushing 5. At this time, the connecting pipe 18 rotates around the vertical rod 19. At the same time, the rotating second bevel gear 25 meshes with another second bevel gear 25 to drive the driven shaft 24 to rotate. When the driven shaft 24 rotates, it will drive the disc 26 to rotate. When the disc 26 rotates, it will synchronously drive the convex rod 27 thereon to move in the chute 30, and then can push the connecting rod 29 and the arc-shaped toothed rack 31 to swing around the fixed shaft 28. At the same time, because the arc-shaped toothed rack 31 and the rack 32 are meshed with each other, the arc-shaped toothed rack 31 doing the swinging motion will drive the rack 32 and the vertical rod 19 to move up and down reciprocally through meshing. The bottom end of the vertically reciprocating vertical rod 19 will drive the lower toothed plate 17 to move up and down through the connection with the connecting pipe 18. When the toothed plate 17 moves up and down, it will mesh with a plurality of first gears 8, thereby driving the first gears 8 to also rotate reciprocally. The reciprocally rotating first gears 8 will then drive the sealing shell 9 to rotate reciprocally through the collar 7. The reciprocally rotating sealing shell 9 will drive the stirring shaft 11 and the stirring blades 13 to swing around the rotation center of the collar 7 through the inner rotating shaft 10 therein. When the rotating shaft 10 swings around the collar 7, because the cross bar 15 is fixedly connected with the fixed rod 14 and the square tube 6, when the rotating shaft 10 swings, the central axis of the cross bar 15 does not deflect relative to the adjacent collar 7. Therefore, at this time, the first bevel gear 16 on the rotating shaft 10 will rotate meshingly around the first bevel gear 16 on the cross bar 15, and then drive the rotating shaft 10 and the stirring shaft 11 to rotate reciprocally around the rotation center of the rotating shaft 10, and then can drive multiple groups of stirring blades 13 thereon to rotate reciprocally around the rotating shaft 10, accelerating the full mixing of hydrochloric acid and calcium chloride solution in the hydrochloric acid mixing tank 1;

[0043] Step 3: When the mixture in the hydrochloric acid mixing tank 1 has been mixed for a certain time, turn off the motor 21 on the hydrochloric acid mixing tank 1, open the opening and closing valve on the discharge pipe 3, start the feed pump, and pump the mixed solution from the hydrochloric acid mixing tank 1 into the analytical tower 33 for rectification. During rectification, hydrogen chloride gas precipitates from the solution and is absorbed by the dilute hydrochloric acid solution at the top of the analytical tower 33 to form concentrated hydrochloric acid. Then, the formed concentrated hydrochloric acid is pumped into the concentrated acid tank 34 for storage, completing the recovery treatment operation of low-concentration hydrochloric acid.

[0044] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments only. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A low-concentration hydrochloric acid resource recovery and utilization device, characterized in that: include: Hydrochloric acid mixing tank (1); A mixing assembly, the mixing assembly comprising a shaft sleeve (5) rotatably connected to a top cover (4), the bottom of the shaft sleeve (5) being fixedly connected to a square tube (6), blade assemblies being respectively arranged on the left and right sides of the square tube (6) and being evenly spaced from top to bottom, the blade assembly comprising a shaft ring (7) rotatably connected to a side wall of the square tube (6), the outer sides of two adjacent shaft rings (7) being close to each other being respectively fixedly connected to a first gear (8), the outer sides of two adjacent shaft rings (7) being far from each other being fixedly connected to a sealing shell (9), a rotating shaft (10) being rotatably connected inside the sealing shell (9), one end of the rotating shaft (10) being fixedly connected to a stirring shaft (11), the outer side of the stirring shaft (11) being fixedly connected to a fixing ring (12), and the shaft of the stirring shaft (11) being arranged along the axis of the stirring shaft (11). The fixing ring (12) is evenly spaced in the linear direction, and the upper and lower sides of the outer side of the fixing ring (12) are fixedly connected to stirring blades (13). The mixing assembly also includes a fixing rod (14) fixedly connected to the bottom of the square tube (6). A cross bar (15) is arranged on the fixing rod (14) at the same axial height as the shaft ring (7). The outer side of the end of the cross bar (15) and the outer side of one end of the adjacent rotating shaft (10) are fixedly connected to a first bevel gear (16), and two adjacent first bevel gears (16) are meshed with each other. The mixing assembly also includes a toothed plate (17) slidably connected to the rear side of the square tube (6), and the toothed plate (17) is meshed with a plurality of first gears (8). The top of the toothed plate (17) is fixedly connected to a connecting tube (18), and a vertical rod (19) is rotatably connected inside the connecting tube (18); The invention also comprises a driving assembly, wherein the driving assembly comprises a fixing frame (20) fixedly connected to the top of the top cover (4), a motor (21) fixedly connected to the top of the fixing frame (20), a driving shaft (22) fixedly connected to the output end of the motor (21), one end of the driving shaft (22) rotatably connected to the top of the top cover (4), a second gear (23) fixedly connected to the outer side of the bottom end of the driving shaft (22) and the outer top of the shaft sleeve (5), the two second gears (23) meshing with each other, a driven shaft (24) rotatably connected to one side of the fixing frame (20), a second bevel gear (25) fixedly connected to the outer side of one end of the driven shaft (24) and the outer side of the driving shaft (22), the two second bevel gears (25) meshing with each other. The other end of the driven shaft (24) is fixedly connected to a disk (26), the front side of the disk (26) is fixedly connected to a convex rod (27), a fixed shaft (28) is fixedly connected to the middle of one side of the fixed frame (20), the fixed shaft (28) is rotatably connected to a connecting rod (29) outside, a slide groove (30) is provided on the connecting rod (29), the convex rod (27) is movably connected to the inner side of the slide groove (30), one end of the connecting rod (29) is fixedly connected to an arc-shaped toothed rack (31), a rack (32) is slidably connected to the middle of one side of the fixed frame (20) and located to the right of the fixed shaft (28), the rack (32) is meshed with the arc-shaped toothed rack (31), and the rack (32) is fixedly connected to the top of the vertical rod (19).

2. A low-concentration hydrochloric acid resource recycling device according to claim 1, characterized in that: A feed pipe (2) is provided at the upper and lower sides of one side of the hydrochloric acid mixing tank (1), a discharge pipe (3) is provided at the bottom of the hydrochloric acid mixing tank (1), and a top cover (4) is provided at the top of the hydrochloric acid mixing tank (1).

3. A low-concentration hydrochloric acid resource recovery and utilization device according to claim 2, characterized in that: A desorption tower (33) is arranged below the hydrochloric acid mixing tank (1), and the discharge pipe (3) is connected to the desorption tower (33) via a feed pump. A concentrated acid tank (34) is arranged below the desorption tower (33), and the desorption tower (33) is connected to the concentrated acid tank (34) via a pipeline.

4. A low-concentration hydrochloric acid resource recovery and utilization device according to claim 2, characterized in that: Both the feed pipe (2) and the discharge pipe (3) are provided with an opening and closing valve.

5. A low-concentration hydrochloric acid resource recycling device according to claim 1, characterized in that: There is an angle between the central axis of the fixed ring (12) and the central axis of the adjacent stirring shaft (11), and the stirring blade (13) is in a spiral shape.

6. A low-concentration hydrochloric acid resource recovery and utilization device according to claim 5, characterized in that: A cross frame (35) is also fixedly connected between the inner walls on the left and right sides of the square tube (6), the cross frame (35) is fixedly connected to the fixing rod (14), and the cross frames (35) are evenly spaced from top to bottom.

7. A low-concentration hydrochloric acid resource recycling device according to claim 1, characterized in that: The circular disk (26) is provided with mutually symmetrical arc grooves (36), and the radius from the arc groove (36) to the center of the circular disk (26) is smaller than the distance from the central axis of the convex rod (27) to the center of the circular disk (26).

8. A low-concentration hydrochloric acid resource recovery and utilization device as claimed in any one of claims 1 to 7, characterized in that: The process of the low-concentration hydrochloric acid resource recovery and utilization device comprises the following steps: Step 1: first open the on-off valve on the feed pipe (2), and the two feed pipes (2) are respectively used to inject low-concentration hydrochloric acid and calcium chloride solution into the hydrochloric acid mixing tank (1) through external pumps. After a certain amount of hydrochloric acid and calcium chloride solution are injected, the on-off valve on the feed pipe (2) is closed to stop the pump; Step 2: Start the motor (21) on the hydrochloric acid mixing tank (1), the motor (21) drives the driving shaft (22) to rotate, and then synchronously drives the second gear (23) and the second bevel gear (25) thereon to rotate, the two second gears (23) drive the shaft sleeve (5) on the other second gear (23) to rotate by meshing with each other, the shaft sleeve (5) then drives the square tube (6), the stirring shaft (11) and the stirring blade (13) to rotate around the rotation center of the shaft sleeve (5) through the connecting piece, when the square tube (6) rotates, the tooth plate (17) and the connecting tube (18) rotate synchronously with the square tube (6) around the rotation center of the shaft sleeve (5), at this time the connecting piece The tube (18) rotates around the vertical rod (19), and the rotating second bevel gear (25) and another second bevel gear (25) are meshed with each other to drive the driven shaft (24) to rotate. When the driven shaft (24) rotates, it drives the disc (26) to rotate. When the disc (26) rotates, it synchronously drives the upper protruding rod (27) to move in the slide groove (30), thereby pushing the connecting rod (29) and the arc-shaped gear rack (31) to swing around the fixed axis (28). At the same time, since the arc-shaped gear rack (31) and the rack (32) are meshed with each other, the arc-shaped gear rack (31) that is swinging will drive the rack (32) and the vertical rod (19) to move up and down through meshing. The bottom end of the vertical rod (19) reciprocating up and down will drive the toothed plate (17) below to perform lifting movement through the connection with the connecting pipe (18). When the toothed plate (17) performs lifting movement, it will mesh with the plurality of first gears (8), thereby driving the first gears (8) to perform reciprocating rotation. The reciprocating first gears (8) will then drive the sealing shell (9) to perform reciprocating rotation through the shaft ring (7). The reciprocating sealing shell (9) will drive the stirring shaft (11) and the stirring blades (13) to perform swinging movement around the rotation center of the shaft ring (7) through the internal rotating shaft (10). During the swinging motion, since the cross bar (15) is fixedly connected to the square tube (6) along with the fixed rod (14), when the rotating shaft (10) swings, the central axis of the cross bar (15) does not deflect relative to the adjacent shaft ring (7), so that at this time, the first bevel gear (16) on the rotating shaft (10) meshes and rotates around the first bevel gear (16) on the cross bar (15), thereby driving the rotating shaft (10) and the stirring shaft (11) to reciprocate around the rotation center of the rotating shaft (10), thereby driving the plurality of stirring blades (13) thereon to reciprocate around the rotating shaft (10), thereby accelerating the full mixing of the hydrochloric acid and the calcium chloride solution in the hydrochloric acid mixing tank (1); Step 3: After the hydrochloric acid mixing tank (1) has been mixed for a certain period of time, the motor (21) on the hydrochloric acid mixing tank (1) is turned off, the on-off valve on the discharge pipe (3) is opened, and the feed pump is started to pump the mixed solution from the hydrochloric acid mixing tank (1) into the desorption tower (33) for distillation. During the distillation, hydrogen chloride gas is precipitated from the solution and is absorbed by the dilute hydrochloric acid solution at the top of the desorption tower (33) to form concentrated hydrochloric acid. The concentrated hydrochloric acid formed is then pumped into the concentrated acid tank (34) for storage, thereby completing the recovery and treatment operation of low-concentration hydrochloric acid.

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