Low-concentration hydrochloric acid resource recycling device and process thereof

Abstract

The invention provides a low-concentration hydrochloric acid resource recycling device and a low-concentration hydrochloric acid resource recycling process, and belongs to the field of low-concentration hydrochloric acid recycling treatment. The mixing assembly comprises a shaft sleeve rotationally connected to the top cover, a square pipe is fixedly connected to the bottom of the shaft sleeve, blade assemblies are arranged on the left side and the right side of the square pipe respectively and distributed at equal intervals from top to bottom, and each blade assembly comprises a shaft ring rotationally connected to one side wall of the square pipe; the sides, close to each other, of the outer sides of every two adjacent shaft rings are fixedly connected with first gears correspondingly. By arranging the mixing assembly and the driving assembly, when a stirring shaft rotates along with a uniquely designed square tube, an internal toothed plate can periodically do lifting motion, and the stirring shaft and stirring blades can be driven to do up-and-down swinging motion while revolving along with a shaft sleeve, so that the flow direction of liquid is disrupted, and vortex is avoided; and the mixing effect between different laminar flows is improved.

Description

Technical Field

[0001] The invention relates to the technical field of low-concentration hydrochloric acid recovery and treatment, and in particular to a low-concentration hydrochloric acid resource recovery and utilization device and a process thereof. Background Art

[0002] The conventional disposal method for acidic water vapor containing hydrochloric acid in industrial production processes, such as the production process of ethyl chloride, is to directly cool and condense it into dilute hydrochloric acid. Because of its low concentration, its reuse value is low. When the main product has a good profit, this part of dilute hydrochloric acid is directly disposed of by acid-base neutralization, which consumes more resources and causes serious environmental pollution. Therefore, it is necessary to use a low-concentration hydrochloric acid resource recovery and utilization device to recover and treat low-concentration hydrochloric acid.

[0003] The common existing method for treating low-concentration hydrochloric acid is distillation. Before the distillation, salt needs to be added to the dilute hydrochloric acid solution to change the relative volatility of the components, so as to destroy the constant boiling composition of hydrochloric acid and water. The salt usually 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, so that it takes a long time to fully mix them, and it is difficult to ensure complete mixing, which will affect the subsequent distillation process of the mixed solution and reduce the production of hydrogen chloride gas. Secondly, during the stirring process, since the stirring rod rotates at a fixed height and in a fixed manner, a vortex is easily formed in the solution, which further hinders the full mixing of the solution.

[0004] Therefore, we propose a low-concentration hydrochloric acid resource recovery and utilization device and process to solve the above problems. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a low-concentration hydrochloric acid resource recovery and utilization device and a process thereof to solve the problems raised in the above background technology.

[0006] The object of the present invention can be achieved by the following technical solution: comprising a hydrochloric acid mixing tank; A mixing assembly, the mixing assembly includes a shaft sleeve rotatably connected to the top cover, a square tube is fixedly connected to the bottom of the shaft sleeve, blade assemblies are respectively arranged on the left and right sides of the square tube, and are evenly spaced from top to bottom, the blade assembly includes a shaft ring rotatably connected to one side wall of the square tube, the outer sides of two adjacent shaft rings that are close to each other are respectively fixedly connected to the first gear, the outer sides of the two adjacent shaft rings that are far away from each other are fixedly connected to the sealing shell, a rotating shaft is rotatably connected in the sealing shell, one end of the rotating shaft is fixedly connected to the stirring shaft, a fixing ring is fixedly connected to the outer side of the stirring shaft, and the stirring blades are evenly spaced along the axial direction of the stirring shaft, and the upper and lower sides of the outer side of the fixing ring are fixedly connected, the mixing assembly also includes a fixed rod fixedly connected to the bottom of the square tube, a cross bar is arranged on the fixed rod at the same axial height as the shaft ring, the outer side of the end of the cross bar and the outer side of one end of the adjacent rotating shaft are fixedly connected to the first bevel gear, and the two adjacent first bevel gears are meshed with each other, and the mixing assembly also includes a toothed plate slidably connected to the rear side of the square tube, the toothed plate is meshed with a plurality of first gears, the top of the toothed plate is fixedly connected to a connecting tube, and a vertical rod is rotatably connected in the connecting tube.

[0007] As a preferred embodiment of the present invention, it also includes a driving assembly, the driving assembly includes a fixed frame fixedly connected to the top of the top cover, the top of the fixed frame is fixedly connected to the motor, the output end of the motor is fixedly connected to the driving shaft, one end of the driving shaft is rotatably connected to the top of the top cover, the bottom outer side of the driving shaft and the outer top of the shaft sleeve are fixedly connected to the second gear, the two second gears are meshed with each other, one side of the fixed frame is rotatably connected to the driven shaft, the outer side of one end of the driven shaft and the outer side of the driving shaft are fixedly connected to the second bevel gear, the two second bevel gears are meshed with each other, the other end of the driven shaft is fixedly connected to a disc, the front side of the disc is fixedly connected to a convex rod, the middle of one side of the fixed frame is fixedly connected to a fixed shaft, the fixed shaft is rotatably connected to a connecting rod, a sliding groove is provided 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 gear rack, the middle of one side of the fixed frame and located on the right side of the fixed shaft is slidably connected to the rack, the rack is meshed with the arc gear rack, and the rack is fixedly connected to the top of the vertical rod.

[0008] As a preferred embodiment of the present invention, feed pipes are respectively provided on the upper and lower sides of one side of the hydrochloric acid mixing tank, a discharge pipe is provided at the bottom of the hydrochloric acid mixing tank, and a top cover is provided on the top of the hydrochloric acid mixing tank.

[0009] As a preferred embodiment of the present invention, a decomposition tower is arranged below the hydrochloric acid mixing tank, and the discharge pipe is connected to the decomposition tower through a feed pump. A concentrated acid tank is arranged below the decomposition tower, and the decomposition tower is connected to the concentrated acid tank through a pipeline.

[0010] As a preferred embodiment of the present invention, the two feed pipes, the discharge pipe and the connecting pipe are all provided with opening and closing valves.

[0011] As a preferred embodiment of the present invention, there is an angle between the central axis of the fixing ring and the central axis of the adjacent stirring shaft, and the stirring blade is in a spiral shape.

[0012] As a preferred embodiment of the present invention, a cross frame is fixedly connected between the inner walls on the left and right sides of the square tube, the cross frame is fixedly connected to the fixing rod, and the cross frames are evenly spaced from top to bottom.

[0013] As a preferred embodiment of the present invention, the disc is provided with mutually symmetrical arcuate grooves, and the radius from the arcuate groove to the center of the disc is smaller than the distance from the central axis of the convex rod to the center of the disc.

[0014] In a second aspect, the present invention provides a low-concentration hydrochloric acid resource recovery and utilization process, comprising the following steps: Step 1: First open the on-off valve on the feed pipe, and use the two feed pipes to respectively inject low-concentration hydrochloric acid and calcium chloride solution into the hydrochloric acid mixing tank through external pumps. After a certain amount is injected, close the on-off valve on the feed pipe and stop the pump; 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 on it to rotate, the two second gears drive the sleeve on the other second gear to rotate by mutual meshing, the sleeve then drives the square tube, the stirring shaft and the stirring blade to rotate around the rotation center of the sleeve through the connecting piece, when the square tube rotates, the tooth plate and the connecting tube rotate synchronously with the square tube around the rotation center of the sleeve, at this time the connecting tube rotates around the vertical rod, and the rotating second bevel gear and the other second bevel gear are meshed with each other 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 on it to move in the slide groove, and then it can push the connecting rod and the arc gear rack to swing around the fixed axis, at the same time, because the arc gear rack and the rack are meshed with each other, the arc gear rack doing the swinging motion will drive the rack and the vertical rod to move up and down through meshing, and the up and down reciprocating movement The bottom end of the vertical rod will drive the lower toothed plate to perform lifting movement through the connection with the connecting pipe. When the toothed plate performs lifting movement, it will mesh with multiple first gears, thereby driving the first gear to also perform reciprocating rotation. The reciprocating first gear will then drive the sealing shell to perform reciprocating rotation through the shaft ring. The reciprocating sealing shell will drive the stirring shaft and the stirring blades to perform swinging movement around the rotation center of the shaft ring through the inner rotating shaft thereof. When the rotating shaft performs swinging movement around the shaft ring, since the cross bar is fixedly connected to the square tube with the fixing rod, when the rotating shaft performs swinging movement, the center axis of the cross bar does not deflect relative to the adjacent shaft ring. Therefore, at this time, the first bevel gear on the rotating shaft will mesh and rotate around the first bevel gear on the cross bar, thereby driving the rotating shaft and the stirring shaft to perform reciprocating rotation around the rotation center of the rotating shaft, thereby driving multiple groups of stirring blades thereon to perform reciprocating rotation around the rotating shaft, thereby accelerating the full mixing of the hydrochloric acid and calcium chloride solution in the hydrochloric acid mixing tank. Step 3: After mixing in the hydrochloric acid mixing tank for a certain period of time, turn off the motor on the hydrochloric acid mixing tank, open the on-off valve on the discharge pipe, start the feed pump, and pump the mixed solution from the hydrochloric acid mixing tank into the decomposition tower for distillation. During distillation, hydrogen chloride gas precipitates from the solution and is absorbed by the dilute hydrochloric acid solution at the top of the decomposition tower to form concentrated hydrochloric acid. The concentrated hydrochloric acid formed thereafter is pumped into the concentrated acid tank for storage, completing the recovery and treatment operation of the low-concentration hydrochloric acid.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the setting of the mixing assembly and driving assembly, when the stirring shaft rotates with the uniquely designed square tube, the internal tooth plate will periodically move up and down, which will drive the stirring shaft and stirring blades to swing up and down while revolving with the shaft sleeve, disrupting the flow direction of the liquid, avoiding the generation of vortices, and improving the mixing effect between different laminar flows.

[0016] 2. By setting up the mixing assembly and driving assembly, the stirring shaft can make a reciprocating rotational motion in another direction along the central axis of the rotating shaft while making a swinging motion. The external stirring blades further increase the stirring and mixing area, further improve the anti-rotation effect and the mixing effect, and help to increase the hydrogen chloride production during the subsequent distillation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a partial three-dimensional structural schematic diagram of the present invention; Figure 3 It is one of the partial cross-sectional three-dimensional structural schematic diagrams of the present invention; Figure 4 yes Figure 2 An enlarged schematic diagram of part A is shown; Figure 5 yes Figure 3 An enlarged schematic diagram of part B is shown; Figure 6 It is a schematic diagram of the process of the present invention.

[0019] In the figure: 1, hydrochloric acid mixing tank; 2, feed pipe; 3, discharge pipe; 4, top cover; 5, shaft sleeve; 6, square tube; 7, shaft ring; 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, tooth plate; 18, connecting pipe; 19, vertical rod; 20, fixing frame; 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, slide groove; 31, arc gear rack; 32, rack; 33, analytical tower; 34, concentrated acid tank; 35, cross frame; 36, arc groove. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 and Figure 6 As shown, a low-concentration hydrochloric acid resource recovery and utilization device comprises a hydrochloric acid mixing tank 1; As an implementation method in this embodiment, Figure 1-Figure 3 and Figure 5As shown, the mixing assembly includes a shaft sleeve 5 rotatably connected to the top cover 4, a square tube 6 is fixedly connected to the bottom of the shaft sleeve 5, blade assemblies are respectively arranged on the left and right sides of the square tube 6, and are evenly spaced from top to bottom, the blade assembly includes a shaft ring 7 rotatably connected to a side wall of the square tube 6, the outer sides of two adjacent shaft rings 7 close to each other are respectively fixedly connected to a first gear 8, the outer sides of the two adjacent shaft rings 7 away from each other are fixedly connected to a sealing shell 9, a rotating shaft 10 is rotatably connected in the sealing shell 9, one end of the rotating shaft 10 is fixedly connected to a stirring shaft 11, and the outer side of the stirring shaft 11 is fixedly connected to A fixing ring 12 is connected and is evenly spaced along the axial direction of the stirring shaft 11. The upper and lower sides of the outer side of the fixing ring 12 are fixedly connected with 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 collar 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 with a first bevel gear 16. The 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. The toothed plate 17 is meshed with multiple first gears 8. The toothed plate 17 is meshed with multiple first gears 8. A connecting pipe 18 is fixedly connected to the top, and a vertical rod 19 is rotatably connected inside the connecting pipe 18. The square tube 6 can make each mounting surface flat, which is convenient for the installation of the sealing shell 9 and the sealing between the contact surfaces. The shaft ring 7 is used to drive the sealing shell 9 to swing and rotate, and the first gear 8 at one end of the outer side is driven to rotate by the lifting of the tooth plate 17, thereby driving the sealing shell 9 to rotate. When the sealing shell 9 rotates, it can drive the stirring shaft 11 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, so as to provide feasibility for the self-rotation of the stirring shaft 11. The fixing rod 14 and the cross bar 15 are fixedly installed The square tube 6 can be ensured to rotate only with the square tube 6 but not 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 thereof will mesh with the first bevel gear 16 on the fixed cross bar 15, thereby driving the rotating shaft 10 to rotate, and then making the stirring shaft 11 and the stirring blade 13 on the outer side thereof follow, thereby realizing multi-angle rotation of the stirring blade 13, thereby further improving the anti-rotation effect and the mixing effect, and helping to increase the hydrogen chloride yield during subsequent distillation.

[0022] As an implementation method in this embodiment, Figure 1-Figure 5As shown, it also includes a driving component, which includes a fixing frame 20 fixedly connected to the top of the top cover 4, a motor 21 is fixedly connected to the top of the fixing frame 20, a driving shaft 22 is fixedly connected to the output end of the motor 21, one end of the driving shaft 22 is rotatably connected to the top of the top cover 4, a second gear 23 is fixedly connected to the outer side of the bottom end of the driving shaft 22 and the outer top of the sleeve 5, the two second gears 23 are meshed with each other, one side of the fixing frame 20 is rotatably connected to a driven shaft 24, one end of the driven shaft 24 is fixedly connected to the outer side of the driving shaft 22 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 to a disc 26, the front side of the disc 26 is fixedly connected to a convex rod 27, a fixed shaft 28 is fixedly connected to the middle of one side of the fixing frame 20, the fixed shaft 28 is rotatably connected to a connecting rod 29, a slide groove 30 is provided on the connecting rod 29, and the convex rod 27 is fixedly connected to the front side of the disc 26. The gear 32 is movably connected to the inner side of the slide groove 30, and one end of the connecting rod 29 is fixedly connected to an arc-shaped gear rack 31. The gear rack 32 is slidably connected to the rack 32 in the middle of one side of the fixed frame 20 and located on the right side of the fixed shaft 28. The gear rack 32 meshes with the arc-shaped gear rack 31, and the rack 32 is fixedly connected to the top of the vertical rod 19. Two synchronous movements can be realized at the same time by the motor 21. One is to drive the sleeve 5 and the square tube 6 to rotate unidirectionally through the meshing of the second gear 23 outside the driving shaft 22 and the other second gear 23; the other is to drive the unidirectional rotation of the disc 26 through the mutual meshing of the second bevel gear 25, and the connecting rod 29 is driven to swing back and forth around the fixed shaft 28 through the cooperation of the convex rod 27 on its outer side and the slide groove 30 on the connecting rod 29, thereby realizing the reciprocating lifting of the rack 32, and then the gear plate 17 is driven to lift and move through the cooperation of the vertical rod 19 and the connecting tube 18, so as to facilitate the driving of the two synchronous movements.

[0023] In this embodiment, if Figure 1 and Figure 5 As shown, a feed pipe 2 is respectively provided on 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 on the top of the hydrochloric acid mixing tank 1. 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, which is convenient for loading and unloading processing.

[0024] In this embodiment, if Figure 1 and Figure 5 As shown, a decomposition tower 33 is arranged below the hydrochloric acid mixing tank 1, and the discharge pipe 3 is connected to the decomposition tower 33 through a feed pump. A concentrated acid tank 34 is arranged below the decomposition tower 33, and the decomposition tower 33 is connected to the concentrated acid tank 34 through a pipeline. The decomposition tower 33 is used to distill the low-concentration hydrochloric acid solution mixture, and the hydrogen chloride gas after distillation is absorbed by the dilute hydrochloric acid solution in the decomposition tower 33 until it becomes a concentrated hydrochloric acid solution, and then the concentrated hydrochloric acid solution is pumped into the concentrated acid tank 34 for storage, thereby completing the concentration increase treatment of the low-concentration hydrochloric acid.

[0025] In this embodiment, if Figure 1 As shown, the two feed pipes 2 and the discharge pipe 3 as well as the connecting pipe are provided with opening and closing valves, which are used to control the opening and closing of the feed pipe 2 and the discharge pipe 3 respectively, so as to facilitate the control of the timing of loading and unloading.

[0026] In this embodiment, if Figure 2 , Figure 3 and Figure 5 As shown, 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 spiral in shape. The angle is set so that there is a certain angle between the stirring blade 13 and the central axis of the stirring shaft 11 after installation, thereby increasing the rotatable area of ​​the stirring blade 13 and improving the mixing effect of different liquids during stirring.

[0027] In this embodiment, if Figure 2 and Figure 5 As shown, a cross frame 35 is fixedly connected between the inner walls of the left and right sides of the square tube 6. The cross frame 35 is fixedly connected to the fixing rod 14. The cross frames 35 are evenly spaced from top to bottom. There are multiple groups of cross frames 35 to support the fixing rod 14 and improve its stability.

[0028] In this embodiment, if Figure 2 and Figure 4 As shown, the disk 26 is provided with mutually symmetrical arc grooves 36, the radius from the arc groove 36 to the center of the disk 26 is smaller than the distance from the center axis of the protruding rod 27 to the center of the disk 26, and the arc groove 36 is used to reduce material consumption and reduce manufacturing costs.

[0029] 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 filled with low-concentration hydrochloric acid and calcium chloride solution into the hydrochloric acid mixing tank 1 through external pumps. After a certain amount is filled, 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 sleeve 5 on the other second gear 23 to rotate by mutual meshing, and the 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 sleeve 5 through the connecting piece. When the square tube 6 rotates, the tooth plate 17 and the connecting pipe 18 rotate synchronously with the square tube 6 around the rotation center of the sleeve 5. At this time, the connecting pipe 18 The second bevel gear 25 rotates around the vertical rod 19, and the rotating second bevel gear 25 is meshed 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 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 doing the swinging motion will drive the rack 32 and the vertical rod 19 to reciprocate up and down through the meshing, and The bottom end of the vertical rod 19 that reciprocates up and down will drive the lower tooth plate 17 to do lifting movement through the connection with the connecting pipe 18. When the tooth plate 17 does lifting movement, it will mesh with multiple first gears 8, thereby driving the first gears 8 to also do reciprocating rotation. The reciprocating first gears 8 will then drive the sealing shell 9 to do reciprocating rotation through the shaft ring 7. The reciprocating sealing shell 9 will drive the stirring shaft 11 and the stirring blades 13 to do swinging movement around the rotation center of the shaft ring 7 through the inner rotating shaft 10. During the movement, since the cross bar 15 is fixedly connected with the square tube 6 along with the fixed rod 14, when the rotating shaft 10 makes a swinging motion, the central axis of the cross bar 15 does not deflect relative to the adjacent shaft ring 7. Therefore, at this time, the first bevel gear 16 on the rotating shaft 10 will mesh and rotate 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 multiple groups of stirring blades 13 thereon to reciprocate around the rotating shaft 10, thereby accelerating the full mixing of the hydrochloric acid and calcium chloride solution in the hydrochloric acid mixing tank 1; Step 3: After the hydrochloric acid mixing tank 1 is 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 draw the mixed solution from the hydrochloric acid mixing tank 1 into the analysis 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 analysis tower 33 to form concentrated hydrochloric acid. The concentrated hydrochloric acid formed thereafter is drawn into the concentrated acid tank 34 for storage, thereby completing the recovery and treatment operation of the low-concentration hydrochloric acid.

[0030] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only 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).

2. A low-concentration hydrochloric acid resource recycling device according to claim 1, characterized in that: 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), the middle of one side of the fixed frame (20) is fixedly connected to a fixed shaft (28), 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), the middle of one side of the fixed frame (20) and located to the right of the fixed shaft (28) is slidably connected to a rack (32), the rack (32) is meshed with the arc-shaped rack (31), and the rack (32) is fixedly connected to the top of the vertical rod (19).

3. A low-concentration hydrochloric acid resource recovery and utilization 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).

4. A low-concentration hydrochloric acid resource recovery and utilization device according to claim 3, 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.

5. A low-concentration hydrochloric acid resource recycling device according to claim 3, characterized in that: The two feed pipes (2) and the discharge pipe (3) as well as the connecting pipe are all provided with opening and closing valves.

6. 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 fixing ring (12) and the central axis of the adjacent stirring shaft (11), and the stirring blade (13) is in a spiral shape.

7. A low-concentration hydrochloric acid resource recovery and utilization device according to claim 6, 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.

8. A low-concentration hydrochloric acid resource recovery and utilization device according to claim 2, 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).

9. A low-concentration hydrochloric acid resource recovery and utilization device as claimed in any one of claims 1 to 8, 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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