Waste acid treatment device for co-production of sodium pyrosulfite

Abstract

The invention relates to the technical field of waste acid treatment, in particular to a waste acid treatment device for co-production of sodium pyrosulfite, which comprises a primary purification tank, a waste acid feed pipe is arranged at the feed end of the primary purification tank, a secondary purification tank is arranged at the discharge end of the primary purification tank, a secondary purification device is mounted in the secondary purification tank, and a waste acid discharge pipe is arranged at the discharge end of the secondary purification tank. A pickling tank is arranged at the side parts of the primary purification tank and the secondary purification tank, a filtering device is mounted in the primary purification tank and comprises a first filtering plate vertically fixed in the middle of the primary purification tank, guide rails are fixed on the inner walls of the two sides of the primary purification tank, and a second filtering plate is fixed on the inner walls of the two sides of the primary purification tank; the filtering device further comprises a second filtering plate sliding on the two guide rails, waste acid is applied to acid pickling of industrial products and is also applied to cleaning of a filtering structure during circulation treatment, and compared with the prior art, the function is improved.

Description

Technical Field

[0001] The invention relates to the technical field of waste acid treatment, and in particular to a waste acid treatment device for co-producing sodium pyrosulfite. Background Art

[0002] A large amount of waste acid is generated during the production of industrial sodium metabisulfite. In order to meet the requirements of environmentally friendly emissions, it is often necessary to set up purification equipment on the waste acid discharge side. Common purification equipment includes a multi-stage sedimentation tank, in which a saline neutralizing liquid is added to the sedimentation tank to degrade the acidity. Alternatively, an electrodialysis processor is set up on the discharge side to purify the acidic components, and then sewage is obtained. After being treated by a sewage treatment device, it meets the discharge standards. The electrodialysis processor does not require the addition of reactants during its treatment process, so the treatment cost is relatively low.

[0003] It can be seen that the existing waste acid treatment device only treats industrial waste acid and cannot reuse the waste acid. For example, in industrial production, the surface of the parts is treated by pickling. Therefore, when the waste acid generated in industrial production is directly treated, waste will occur. After the filter element (such as the filter net) in the purification tank is used for a long time, the filter hole is blocked by impurities, affecting the filtering effect. Summary of the invention

[0004] In order to solve the above problems, the present invention provides the following technical solutions:

[0005] A waste acid treatment device for co-producing sodium metabisulfite comprises a primary purification tank, a waste acid feed pipe is provided at the feed end of the primary purification tank, a secondary purification tank is provided at the discharge end of the primary purification tank, a secondary purification device is installed in the secondary purification tank, a pickling tank is provided at the side of the primary purification tank and the secondary purification tank, a filtering device is installed in the primary purification tank, the filtering device comprises a first filter plate vertically fixed in the middle of the primary purification tank, guide rails are fixed on the inner walls of both sides of the primary purification tank, the filtering device also comprises a second filter plate sliding on the two guide rails, a vertical upward partition plate is fixed in the primary purification tank, the partition plate is close to the secondary purification tank, an interception plate close to the first filter plate is fixed in the primary purification tank, the primary purification tank is divided into a first pool unit pool and a second pool unit pool by the partition plate, the second pool unit pool is close to the secondary purification tank, and one end of the second filter plate is placed on the The top surface of the partition plate is inserted into the bottom surface of the intercepting plate, and the second filter plate covers the second pool unit pool. A feed pipe is connected between the feed end of the pickling tank and the secondary purification tank, and a valve is installed on the feed pipe. A return pipe is connected to the discharge end of the pickling tank. A water bag is installed on the outside of the primary purification tank. The end of the return pipe is connected to the water bag after reaching the outside of the primary purification tank. A connecting rod is fixed on the top surface of the second filter plate, and the other end of the connecting rod is bent to the outside of the primary purification tank and connected to the water bag. When the return pipe injects water into the water bag, the water bag expands along the length direction, and at the same time, the second filter plate is driven by the connecting rod to move from the second pool unit pool to the first pool unit pool along the bottom of the intercepting plate. A pressure relief valve is fixed on the other end of the water bag away from the return pipe, and the valve port of the pressure relief valve enters the first pool unit pool.

[0006] Further preferably, the secondary purification device is an electrodialysis treatment device, a water pump is installed in the secondary purification tank, and the water inlet of the water pump is connected to the secondary purification tank through a pipe and connected to the pickling tank through another water pipe.

[0007] Further preferably, an opening is provided at the discharge end of the primary purification tank, and a bottom edge of the opening is higher than a top surface of the partition plate.

[0008] Further preferably, an assembly groove is provided on the side of the primary purification tank along the length direction, the water bag is located in the assembly groove, the bottom surface of the water bag is slidably fitted on the bottom surface of the assembly groove, and a movable space is left between the other end of the water bag away from the reflux pipe and one end of the assembly groove, the movable space is located on the feed interception side of the first filter plate, an oriented groove is provided on the assembly groove, the pressure relief valve slides in the oriented groove, the part of the water bag connected to the pressure relief valve is a corrugated structure, and the other part of the water bag is a non-corrugated structure.

[0009] Further preferably, a limiting block that continues to extend horizontally is fixed on the other end of the water bag away from the reflux pipe, and a baffle that limits the water bag from falling off is fixed on the outer side of the assembly groove.

[0010] Further preferably, the second filter plate is a composite structure, which consists of a solid seat sliding on the guide rail and a filter body connected to the solid seat, the free end of the filter body is placed on the top of the partition plate and is horizontally supported, the solid seat is inserted on the bottom surface of the intercepting plate, a rack is fixed on the inner wall of the primary purification tank, a gear is fixed on the filter body, the gear is close to the solid seat, and the rack is close to the waste acid feed pipe, and the gear is driven by the filter body to move to mesh with the rack, thereby driving the filter body to deflect downward and then insert into the acid liquid in the primary purification tank.

[0011] Further preferably, the two guide rails are respectively composed of two front and rear guide rail units hinged together, and a gas spring is connected between the bottom surfaces of the two guide rail units. When the filter body rotates downward, the retraction and deflection movement of the gas spring pushes the front guide rail unit to deflect downward.

[0012] Further preferably, movement gaps are left between the two ends of the interception plate and the two inner walls of the primary purification tank.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. A pickling tank is set up on one side of the treatment device. Part of the waste acid flows into the pickling tank through the feed pipe and is used for surface pickling treatment of industrial product parts, so as to achieve the purpose of reusing the waste acid. When the waste acid in the pickling tank needs to be replaced, the waste acid in the pickling tank is pumped into the secondary purification device by a water pump for purification and then discharged, and then new waste acid is added to the pickling tank through the feed pipe for pickling treatment of product parts.

[0015] 2. A water bag is set on one side of the primary purification tank, and the return pipe on the pickling tank is connected to the water bag. The valve on the return pipe is opened to inject part of the waste acid into the water bag. The elongation action generated by the water bag is used to drive the pressure relief valve to move linearly along the directional groove, push the connecting rod to move, and the connecting rod pushes the filter body to move linearly along the two guide rails for a certain stroke. At the same time, the filter body also moves linearly with the gear. At the same time, through the hinge relationship, the filter body also pushes the solid seat to move linearly. When the filter body moves to the meshing relationship between the gear and the rack, the gear will rotate counterclockwise, and the gear drives the filter body relative to the solid The seat deflects downward, and at this time, the filter body inserts all the mesh parts into the waste acid in the first unit pool. Since the filter body is inserted into the waste acid by deflection, the mesh is impacted by the waste acid, so that the impurities blocked in the mesh during filtration fall off downward. The power for the second filter plate to complete the swinging flushing action comes from the water bag, and the power for stretching the water bag comes from the waste acid in the pickling tank, and the waste acid in the pickling tank comes from the secondary purification tank. The waste acid is not only applied to the pickling of industrial product parts, but also applied to the cleaning of the filter structure during circulation treatment. Compared with the existing technology, the function is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a waste acid treatment device for co-producing sodium metabisulfite provided in an embodiment of the present invention;

[0017] Figure 2 A waste acid treatment device for co-producing sodium pyrosulfite provided in an embodiment of the present invention comprises Figure 1 The enlarged schematic diagram of the A part is shown in FIG.

[0018] Figure 3 A waste acid treatment device for co-producing sodium pyrosulfite provided in an embodiment of the present invention comprises Figure 1 A schematic diagram from another rotating perspective;

[0019] Figure 4 A schematic plan view of a cutaway waste acid treatment device for co-producing sodium metabisulfite provided in an embodiment of the present invention;

[0020] Figure 5 A waste acid treatment device for co-producing sodium pyrosulfite provided in an embodiment of the present invention comprises Figure 4 The three-dimensional schematic diagram is derived;

[0021] Figure 6 A working principle diagram of a waste acid treatment device for co-producing sodium metabisulfite provided in an embodiment of the present invention;

[0022] Figure 7 A waste acid treatment device for co-producing sodium pyrosulfite provided in an embodiment of the present invention comprises Figure 6Schematic diagram of the working principle from another perspective.

[0023] In the figure: 1. primary purification tank; 3. waste acid feed pipe; 4. secondary purification tank; 5. secondary purification device; 6. pickling tank; 7. feed pipe; 8. valve; 9. water bag; 10. filter device; 11. first filter plate; 12. baffle; 13. guide rail; 14. second filter plate; 15. partition plate; 16. interception plate; 17. first tank unit tank; 18. second tank unit tank; 19. return pipe; 20. connecting rod; 21. pressure relief valve; 22. opening; 23. assembly groove; 24. activity space; 25. directional groove; 26. solid seat; 27. filter body; 28. rack; 29. ​​gear; 30. guide rail unit; 31. gas spring; 32. limit block; 33. movement gap; 34. water pump. DETAILED DESCRIPTION

[0024] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0025] In one embodiment, Figure 1-Figure 7As shown: This embodiment provides a waste acid treatment device for co-producing sodium metabisulfite, including a primary purification tank 1, a waste acid feed pipe 3 is provided at the feed end of the primary purification tank 1, a secondary purification tank 4 is provided at the discharge end of the primary purification tank 1, a secondary purification device 5 is installed in the secondary purification tank 4, a pickling tank 6 is provided on the sides of the primary purification tank 1 and the secondary purification tank 4, a filtering device 10 is installed in the primary purification tank 1, the filtering device 10 includes a first filter plate 11 vertically fixed in the middle of the primary purification tank 1, guide rails 13 are fixed on the inner walls of both sides of the primary purification tank 1, the filtering device 10 also includes a second filter plate 14 sliding on the two guide rails 13, a vertical upward partition plate 15 is fixed in the primary purification tank 1, the partition plate 15 is close to the secondary purification tank 4, an interception plate 16 close to the first filter plate 11 is fixed in the primary purification tank 1, the primary purification tank 1 is divided into a first pool unit pool 17 and a second pool unit pool 18 by the partition plate 15, the second pool unit pool 18 is close to the secondary purification tank 4, and the second One end of the filter plate 14 is placed on the top surface of the partition plate 15, and the other end is inserted on the bottom surface of the interception plate 16, and the second filter plate 14 covers the second pool unit pool 18, and a feed pipe 7 is connected between the feed end of the pickling pool 6 and the secondary purification pool 4, and a valve 8 is installed on the feed pipe 7, and a return pipe 19 is connected to the discharge end of the pickling pool 6. A water bag 9 is installed outside the primary purification pool 1, and the end of the return pipe 19 reaches the outside of the primary purification pool 1 and is connected to the water bag 9. The top of the second filter plate 14 A connecting rod 20 is fixed on the surface, and the other end of the connecting rod 20 is bent to the outside of the primary purification tank 1 and connected to the water bag 9. When the reflux pipe 19 injects water into the water bag 9, the water bag 9 expands along the length direction, and at the same time, the second filter plate 14 is driven by the connecting rod 20 to move along the bottom of the intercepting plate 16 from the second pool unit pool 18 to the first pool unit pool 17. A pressure relief valve 21 is fixed on the other end of the water bag 9 away from the reflux pipe 19, and the valve mouth of the pressure relief valve 21 enters the first pool unit pool 17.

[0026] An opening 22 is formed at the discharge end of the primary purification tank 1 , and the bottom edge of the opening 22 is higher than the top surface of the partition plate 15 .

[0027] An assembly groove 23 is provided on the side of the primary purification tank 1 along the length direction, and the water bag 9 is located in the assembly groove 23. The bottom surface of the water bag 9 is slidably fitted on the bottom surface of the assembly groove 23. An activity space 24 is left between the other end of the water bag 9 away from the reflux pipe 19 and one end of the assembly groove 23. The activity space 24 is located on the feed interception side of the first filter plate 11. An oriented groove 25 is provided on the assembly groove 23, and the pressure relief valve 21 slides in the oriented groove 25. The part of the water bag 9 connected to the pressure relief valve 21 is a corrugated structure, and the other part of the water bag 9 is a non-corrugated structure.

[0028] A limiting block 32 that continues to extend horizontally is fixed to the other end of the water bag 9 away from the reflux pipe 19 , and a baffle 12 that limits the water bag 9 from falling off is fixed to the outside of the assembly groove 23 .

[0029] The second filter plate 14 is a composite structure, which consists of a solid seat 26 sliding on the guide rail 13 and a filter body 27 connected to the solid seat 26. The free end of the filter body 27 is placed on the top of the partition plate 15 and supported horizontally. The solid seat 26 is inserted on the bottom surface of the interception plate 16. A rack 28 is fixed on the inner wall of the primary purification tank 1, and a gear 29 is fixed on the filter body 27. The gear 29 is close to the solid seat 26, and the rack 28 is close to the waste acid feed pipe 3. Driven by the filter body 27, the gear 29 moves to mesh with the rack 28, driving the filter body 27 to deflect downward and then insert into the acid solution of the primary purification tank 1. Figure 6 As shown, the connecting rod 20 is composed of two connecting rod units hinged together. When the filter body 27 is horizontal (not deflected downward), the lower connecting rod unit is folded into the upper connecting rod unit, and when the filter body 27 is deflected downward, the bottom connecting rod unit expands downward to ensure that the deflection of the filter body 27 is effective.

[0030] Working principle and technical effect: industrial waste acid enters the primary purification tank 1 through the waste acid feed pipe 3, is treated by the filtering device 10 in the primary purification tank 1, and then enters the secondary purification tank 4. After being treated by the secondary purification device 5 in the secondary purification tank 4, it meets the discharge standards. The secondary purification device 5 referred to here takes the electrodialysis treatment equipment as an example 5 (the secondary purification device 5 is the prior art and will not be repeated here). After purification in the two-stage tank, the secondary purification device 5 completes the acid electrolysis treatment and then discharges the sewage into the subsequent treatment system. In addition, when the waste acid flows into the secondary purification tank 4, the valve 8 is opened to allow part of the waste acid to flow into the pickling tank 6 through the feed pipe 7 and be applied to the surface pickling treatment of industrial product parts, thereby achieving the purpose of reusing the waste acid. When the waste acid in the pickling tank 6 needs to be replaced, the waste acid in the pickling tank 6 is extracted by the water pump 34 to the secondary purification device for purification and then discharged, and then new waste acid is added to the pickling tank 6 through the feed pipe 7 for pickling treatment of product parts.

[0031] As mentioned above, when the waste acid enters the primary purification tank 1 for treatment, the first filter plate 11 intercepts the impurities in the first unit tank 17 to complete the primary filtration, and then flows into the space between the first filter plate 11 and the partition plate 15. After being blocked by the partition plate 15, the liquid level gradually rises, and the impurities are precipitated in the space. Then, after the second filter plate 14 is filtered for the second time, it flows into the second unit tank 18. After the second unit tank 18, the remaining impurities are precipitated for the second time, and the diluted liquid flows into the secondary purification tank 4 through the opening 22, and is discharged after the acid degradation is completed by the secondary purification device 5 in the secondary purification tank 4. It can be seen that the first filter plate 11 and the second filter plate 14 not only improve the filtering effect, but also, in particular, the second filter plate 14 is placed on the top of the partition plate 15 in a horizontal manner, so that when the waste acid is diluted upward, most of the impurities are intercepted in the first unit tank 17.

[0032] like Figure 2 , Figure 6 as well as Figure 7 As shown, when the waste acid in the pickling tank 6 is replaced, the valve (omitted) on the reflux pipe 19 is opened to inject this part of the waste acid into the water bag 9, so that the water bag 9 is stretched in the assembly groove 23, and the stretching action generated by the water bag 9 is used to drive the pressure relief valve 21 to move linearly along the directional groove 25, push the connecting rod 20 to move, and the connecting rod 20 pushes the filter body 27 to first move linearly along the two guide rails 13 for a certain stroke, and at the same time, the filter body 27 also moves linearly with the gear 29, and at the same time, through the hinge relationship, the filter body 27 also pushes the solid seat 26 to move linearly, when the filter body 27 moves to make the gear 29 mesh with the rack 28, the gear 29 will rotate counterclockwise, and the gear 29 drives the filter body 27 to deflect downward relative to the solid seat 26, at this time, the filter body 27 inserts all the mesh (filter hole) part into the waste acid in the first pool unit pool 17, because the filter body 27 is pushed into the waste acid The insertion method is deflection, so that the mesh is impacted by the waste acid, so that the impurities blocked in the mesh during filtration fall off downward. Since the first filter plate 11 is upright in the first pool unit pool 17, and its mesh surface is relative to the waste acid feed pipe 3, the waste acid will have an impact effect on the first filter plate 11 when it is discharged into the first pool unit pool 17. Therefore, the mesh on the first filter plate 11 is not easy to be blocked. Therefore, there is no need to use a deflection method to flush the mesh like the second filter plate 14. The power for the second filter plate 14 to complete the swinging flushing action comes from the water bag 9, and the power for stretching the water bag 9 comes from the waste acid in the pickling tank 6, and the waste acid in the pickling tank 6 comes from the secondary purification tank 4. Therefore, when the present invention treats waste acid, it not only applies the waste acid to the pickling of industrial product parts, but also applies it to the cleaning of the filter structure during circulation treatment, which improves the function compared with the prior art.

[0033] like Figure 2As shown, there is a movement gap 33 between the two ends of the interception plate 16 and the two inner walls of the primary purification tank 1. The movement gap 33 at one end is so that the gear 29 can pass through the interception plate 16 when it moves with the filter body 27, and the movement gap 33 at the other end is so that the water bag 9 can pass through the interception plate 16 when it becomes longer toward the activity space 24 and pushes the connecting rod 20 to move. When the filter body 27 moves linearly, it passes through the interception plate 16, and while passing through the interception plate 16, the bottom surface of the interception plate 16 is used to clean the impurities remaining on the top surface of the filter body 27 downward, and the cleaned impurities are blocked on the front side of the interception plate 16, and fall into the waste acid in the first pool unit pool 17 and precipitate as the filter body 27 deflects downward.

[0034] like Figure 1 , Figure 2 , Figure 6 as well as Figure 7 As shown, the two guide rails 13 are respectively composed of two front and rear guide rail units 30 hinged together, and a gas spring 31 is connected between the bottom surfaces of the two guide rail units 30. When the filter body 27 rotates downward, the front guide rail unit 30 is pushed to deflect downward through the retraction and deflection movement of the gas spring 31. When the filter body 27 moves linearly, the guide rail unit 30 supports and guides the bottom surface of the filter body 27. At this time, the action rod of the gas spring 31 releases its length and supports the front guide rail unit 30 in a horizontal state. When the filter body 27 moves to make the gear 29 and the rack 28 mesh and deflect downward, the front guide rail unit 30 will deflect downward, and when the gas spring 31 deflects downward, its action rod will also shrink and shorten.

[0035] When the elongation of the water bag 9 reaches the limit, the free end of the limiting block 32 will hit the same side end of the assembly groove 23. As the amount of liquid in the water bag 9 gradually increases, the hydraulic pressure will gradually increase. When the liquid pressure exceeds the opening pressure of the pressure relief valve 21, the pressure relief valve 21 opens, allowing the excess waste acid in the water bag 9 to be discharged into the first pool unit pool 17, completing the pressure relief. Close the return pipe 19, no longer inject waste acid into the water bag 9, push the limiting block 32 in the reverse direction, and drain the waste acid in the water bag 9 through the pressure relief valve 21. The water bag 9 gradually shortens, the pressure relief valve 21 and the connecting rod 20 are pulled back, the bottom unit of the connecting rod 20 is folded upward, and the filter body 27 is pulled back upward. At the same time, the filter body 27 is pulled back in a straight line. The action rod of the gas spring 31 pops up and pushes the front guide rail unit 30 to deflect upward to the horizontal. The guide rail unit 30 supports the filter body 27 to rotate back to the horizontal. As the water bag 9 shortens, the filter body 27 is pulled back again using the connecting rod 20. Figure 5 in the position shown.

[0036] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described according to their actual installation and actual use as well as the customary orientations of technicians in this field. This is hereby explained.

[0037] The specific implementation methods described above further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste acid treatment device for co-producing sodium metabisulfite, characterized in that: The invention comprises a primary purification tank (1), wherein a waste acid feed pipe (3) is provided at the feed end of the primary purification tank (1), a secondary purification tank (4) is provided at the discharge end of the primary purification tank (1), a secondary purification device (5) is installed in the secondary purification tank (4), a pickling tank (6) is provided on the side of the primary purification tank (1) and the secondary purification tank (4), a filtering device (10) is installed in the primary purification tank (1), the filtering device (10) comprises a first filtering plate (11) vertically fixed in the middle of the primary purification tank (1), guide rails (13) are fixed on the inner walls of both sides of the primary purification tank (1), and the filtering device (10) is provided with a filter plate (11) disposed on the filter plate (11) and a filter plate (10) disposed on the filter plate (11). 10) also includes a second filter plate (14) sliding on the two guide rails (13), a vertical upward partition plate (15) is fixed in the primary purification tank (1), the partition plate (15) is close to the secondary purification tank (4), an interception plate (16) is fixed in the primary purification tank (1) close to the top of the first filter plate (11), the primary purification tank (1) is divided into a first pool unit pool (17) and a second pool unit pool (18) by the partition plate (15), the second pool unit pool (18) is close to the secondary purification tank (4), one end of the second filter plate (14) is placed on the top of the partition plate (15) The first filter plate (14) is provided with a first end and a second end thereof, and the second end thereof is inserted into the bottom surface of the intercepting plate (16), and the second filter plate (14) covers the second pool unit pool (18). A feed pipe (7) is connected between the feed end of the pickling pool (6) and the second purification pool (4), and a valve (8) is installed on the feed pipe (7). A return pipe (19) is connected to the discharge end of the pickling pool (6). A water bag (9) is installed on the outside of the first purification pool (1), and the end of the return pipe (19) reaches the outside of the first purification pool (1) and is connected to the water bag (9). A connecting rod (20) is fixed on the top surface of the second filter plate (14). The other end of the connecting rod (20) is bent to the outside of the primary purification tank (1) and connected to the water bag (9). When the return pipe (19) injects water into the water bag (9), the water bag (9) expands along the length direction, and at the same time, the second filter plate (14) is driven by the connecting rod (20) to move along the bottom of the intercepting plate (16) from the second pool unit pool (18) to the first pool unit pool (17). A pressure relief valve (21) is fixed to the other end of the water bag (9) away from the return pipe (19), and the valve port of the pressure relief valve (21) enters the first pool unit pool (17).

2. The waste acid treatment device for co-producing sodium metabisulfite according to claim 1, characterized in that: The secondary purification device (5) is an electrodialysis treatment device. A water pump (34) is installed in the secondary purification tank (4). The water inlet of the water pump (34) is connected to the secondary purification tank (4) through a pipe and connected to the pickling tank (6) through another water pipe.

3. The waste acid treatment device for co-producing sodium metabisulfite according to claim 2, characterized in that: An opening (22) is provided at the discharge end of the primary purification tank (1), and the bottom edge of the opening (22) is higher than the top surface of the partition plate (15).

4. The waste acid treatment device for co-producing sodium metabisulfite according to claim 3, characterized in that: The side of the primary purification tank (1) is provided with an assembly groove (23) along the length direction, the water bag (9) is located in the assembly groove (23), the bottom surface of the water bag (9) is slidably fitted on the bottom surface of the assembly groove (23), and an activity space (24) is left between the other end of the water bag (9) away from the reflux pipe (19) and one end of the assembly groove (23), and the activity space (24) is located on the feed interception side of the first filter plate (11). The assembly groove (23) is provided with an orientation groove (25), and the pressure relief valve (21) slides in the orientation groove (25). The part of the water bag (9) connected to the pressure relief valve (21) is a corrugated structure, and the other part of the water bag (9) is a non-corrugated structure.

5. The waste acid treatment device for co-producing sodium metabisulfite according to claim 4, characterized in that: A limiting block (32) that continues to extend horizontally is fixed on the other end of the water bag (9) away from the return pipe (19), and a baffle (12) that limits the water bag (9) from falling off is fixed on the outside of the assembly groove (23).

6. The waste acid treatment device for co-producing sodium metabisulfite according to claim 5, characterized in that: The second filter plate (14) is a composite structure, which is composed of a solid seat (26) sliding on the guide rail (13) and a filter body (27) connected to the solid seat (26). The free end of the filter body (27) is placed on the top of the partition plate (15) and supported horizontally. The solid seat (26) is inserted into the bottom surface of the intercepting plate (16). A rack (28) is fixed on the inner wall of the primary purification tank (1). A gear (29) is fixed on the filter body (27). The gear (29) is close to the solid seat (26), and the rack (28) is close to the waste acid feed pipe (3). When the gear (29) is driven by the filter body (27) to move to mesh with the rack (28), it drives the filter body (27) to deflect downward and then insert into the acid liquid in the primary purification tank (1).

7. The waste acid treatment device for co-producing sodium metabisulfite according to claim 6, characterized in that: The two guide rails (13) are respectively composed of two front and rear guide rail units (30) hinged together, and a gas spring (31) is connected between the bottom surfaces of the two guide rail units (30). When the filter body (27) rotates downward, the retraction and deflection movement of the gas spring (31) pushes the front guide rail unit (30) to deflect downward.

8. The waste acid treatment device for co-producing sodium metabisulfite according to claim 7, characterized in that: A movement gap (33) is left between the two ends of the interception plate (16) and the two inner walls of the primary purification tank (1).

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