Waste sulfuric acid concentrating and recycling device

Abstract

The invention discloses a waste sulfuric acid concentrating and recycling device and belongs to the technical field of sulfuric acid recycling. The device comprises a base, a concentration tank is mounted at the top of the base, a filtering mechanism is arranged in the concentration tank, the filtering mechanism comprises a first mounting disc for filtering vaporized sulfuric acid when waste sulfuric acid is concentrated and recycled, and a stirring mechanism is arranged at the bottom of the first mounting disc for stirring the vaporized sulfuric acid when the waste sulfuric acid is concentrated and recycled. And the waste sulfuric acid is stirred and mixed uniformly in multiple directions. A limiting rod is separated from a threaded groove of a threaded rod, so that a tension spring instantly releases tension to drive a second mounting disc, a filter screen and a first mounting disc to quickly reset, the space above the filter screen in the concentration tank is compressed, air quickly passes through small-diameter air holes of the filter screen, and impurities adsorbed in the air holes and on the lower surfaces of the air holes are blown away by quick airflow; self-cleaning of the filter screen in the concentration process is realized, the filter screen is effectively prevented from being blocked by impurity accumulation, and the waste sulfuric acid concentration and recovery processing is guaranteed to be smoothly carried out.

Description

Technical Field

[0001] This invention relates to the field of sulfuric acid recovery technology, and in particular to a waste sulfuric acid concentration and recycling device. Background Technology

[0002] Sulfuric acid is an inorganic compound and the most important oxyacid of sulfur. It is a highly reactive diprotic inorganic strong acid, reacting with most metals. High-concentration sulfuric acid has strong hygroscopic properties and can be used as a dehydrating agent, carbonizing wood, paper, cotton and linen fabrics, and biological materials containing carbohydrates. Sulfuric acid is widely used in the chemical and steel industries. However, in many production processes, its utilization rate is very low, and large amounts of sulfuric acid are discharged along with acidic wastewater. If this wastewater is discharged into the environment without treatment, it will not only acidify water bodies or soil, harming the ecological environment, but also waste a large amount of resources. Waste sulfuric acid can be recovered through concentration, requiring the use of waste sulfuric acid concentration and recovery equipment.

[0003] The concentration tank in a waste sulfuric acid concentration and recovery unit is a crucial process for processing and recovering waste sulfuric acid. The filter plates in traditional concentration tanks play a vital role. However, after prolonged use, the filter surfaces accumulate a significant amount of impurities, leading to clogging and reduced performance. Cleaning is typically done by using a cleaning brush to contact the filter plates. However, the high temperature and humidity inside the concentration tank soften these impurities, causing some to enter the filter pores and further clog the plates. This necessitates manual cleaning after shutdown, increasing processing time, wasting effort, and potentially posing a hazard to workers. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art, and to propose a waste sulfuric acid concentration and recycling device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a waste sulfuric acid concentration and recycling device, comprising a base, a concentration tank installed on the top of the base, and a filter mechanism provided inside the concentration tank, two slots opened on the inner wall of the base, an inlet pipe fixedly installed through the bottom of the concentration tank, a recycling tank fixedly installed on the top of the base, a condenser fixedly installed on the top of the recycling tank, and a circulation pump fixedly installed on the top of the base, with circulation pipes fixedly installed at both ends of the circulation pump; The filtration mechanism includes a first mounting plate for filtering vaporized sulfuric acid during waste sulfuric acid concentration and recovery. The bottom of the first mounting plate is equipped with a stirring mechanism to stir and mix the waste sulfuric acid from multiple directions during the concentration and recovery of waste sulfuric acid. The inner wall of the groove is equipped with a resistance mechanism to create resistance to the displacement of the filtration and stirring mechanisms during the concentration and recovery of waste sulfuric acid, causing the waste sulfuric acid adsorbed on their surfaces to fall off.

[0006] Furthermore, the filtering mechanism includes a threaded rod, a first mounting plate slidably connected to the outer wall of the threaded rod, a mounting groove formed at the top of the first mounting plate, and a fixed frame fixedly connected to the inner wall of the fixed frame. Two first abutments are slidably connected through the outer wall of the fixed frame, a ring is fixedly connected to the top of the fixed frame, and two second abutments are slidably connected through the outer wall of the ring. A connecting plate is fixedly connected to the outer walls of the first and second abutments located on the same side of the fixed frame. A third spring is fixedly connected between the opposite sides of the two connecting plates. A limiting rod is slidably connected through the outer wall of the frame, and a limiting plate is fixedly connected to the outer wall of one end of the limiting rod located inside the fixed frame. A fourth spring is fixedly connected to the end of the limiting rod located inside the fixed frame. A second positioning rod is fixedly connected to the inner wall of each of the two slots. A second mounting plate is slidably connected to the outer wall of each of the two second positioning rods. Tension springs are fixedly connected to the inner wall of each of the two slots at positions corresponding to the outer wall of the second positioning rod. A stop rod is fixedly connected to the inner wall of the base. A filter screen is fixedly installed between the outer wall of the first mounting plate and the inner wall of the second mounting plate.

[0007] Furthermore, the outer wall of the threaded rod has a threaded groove that engages with the end of the limiting rod. The inclined surface of the end of the first abutment corresponds to the side wall of the limiting plate, and the inclined surface of the end of the second abutment corresponds to the side wall of the abutment rod. The outer wall of the limiting plate is slidably connected to the inner wall of the fixed frame. The end of the fourth spring away from the limiting rod is fixedly connected to the inner wall of the fixed frame. The outer wall of the second mounting plate slides against the inner wall of the base. The bottoms of the two tension springs are fixedly connected to the top of the second mounting plate. The outer wall of the abutment rod corresponds to the inner wall of the ring.

[0008] Furthermore, the stirring mechanism includes a mounting base, and a third positioning rod is fixedly connected to the top of the mounting base. A rotating cylinder is sleeved on the outer wall of the third positioning rod. A rotating ring is rotatably connected to the outer wall of the rotating cylinder, and two connecting columns are fixedly connected to the top of the rotating ring. A fixing rod is provided through the interior of the rotating cylinder. A limit block is fixedly connected to the outer wall of one end of the threaded rod. Several stirring blades are fixedly installed on the outer wall of the rotating cylinder.

[0009] Furthermore, the bottom of the mounting base is fixedly connected to the bottom of the inner wall of the concentration tank, the ends of the two connecting columns away from the rotating ring are fixedly connected to the bottom of the first mounting plate, and the end of the threaded rod connected to the limiting block is slidably connected to the inner wall of the fixed rod.

[0010] Furthermore, the resistance mechanism includes a first fixed plate, and a plurality of movable blocks are slidably connected through the side wall of the first fixed plate. A fifth spring is fixedly connected to the end of each of the movable blocks away from the second positioning rod. A second fixed plate is fixedly connected to the end of each of the fifth springs away from the movable blocks. The outer wall of the first fixed plate is fixedly connected to the inner wall of the slot. The inclined surfaces at the ends of the movable blocks correspond to the outer wall of the second mounting plate. The outer wall of the second fixed plate is fixedly connected to the inner wall of the slot.

[0011] Furthermore, a connecting rod is fixedly connected to the top of the second mounting plate, and a slider is slidably connected to the inner wall of the connecting rod. A first spring is fixedly connected to the bottom of the slider, and the end of the first spring away from the slider is fixedly connected to the inner wall of the connecting rod. A protrusion is slidably connected through the inner wall of the slider, and a second spring is fixedly connected to one end of the protrusion. The end of the second spring away from the protrusion is fixedly connected to the inner wall of the slider. Two first positioning rods are fixedly connected to the inner wall of the base. A sealing plate is slidably connected to the outer walls of the two first positioning rods, and the interior of the sealing plate is slidably connected through the outer wall of the connecting rod.

[0012] Furthermore, a motor is fixedly installed on the top of the concentration tank, and the end of the threaded rod away from the limiting block is fixedly installed on the output shaft of the motor.

[0013] Furthermore, the input end of the circulation pump is connected to the interior of the recovery tank through the circulation pipe, and the output end of the circulation pump is connected to the interior of the first positioning rod through the circulation pipe. A steam delivery pipe is fixedly installed through the top of the concentration tank, and the end of the steam delivery pipe away from the concentration tank is fixedly installed at the input end of the condenser. One-way valves are provided inside both the liquid inlet pipe and the circulation pipe.

[0014] Compared with existing technologies, the above solution has the following advantages: The limiting rod disengages from the threaded groove of the threaded rod, and then the tension of the spring drives the reset sliding. Because the pore diameter of the filter screen is small and the tension of the spring is released instantaneously, when the second mounting plate moves the filter screen and the first mounting plate to reset, it compresses the space above the displacement filter screen inside the concentration tank, allowing air to quickly pass through the pores of the filter screen. The rapidly passing airflow can blow away impurities adsorbed inside the pores and on the lower surface of the filter screen. By compressing the space, the filter screen self-cleans during the concentration process, avoiding the problem of filter screen blockage caused by impurity accumulation, which would affect the concentration and recovery of waste sulfuric acid.

[0015] 2. During the concentration and recovery of waste sulfuric acid, the screw rod rotates the drum synchronously, driving several stirring blades to stir the waste sulfuric acid. This allows the waste sulfuric acid to flow inside the concentration tank, making the waste sulfuric acid heated more evenly, shortening the concentration heating process, and improving the recycling efficiency of waste sulfuric acid. At the same time, the rotation of the threaded rod will also drive the first mounting plate to reset and move up and down, so that the rotating ring drives the rotating drum to move synchronously, increasing the stirring range of the stirring blades inside the concentration tank, further ensuring that the waste sulfuric acid is heated evenly, preventing local overheating or scaling, and avoiding the problems of over-stirring or under-stirring caused by the traditional "one-size-fits-all" design of stirring.

[0016] 3. During the upward reset of the second mounting plate, its outer wall will be resisted by the moving block, which will cause the reset speed of the second mounting plate to change. During the acceleration process, the compressed air will spray into the air holes of the filter screen, and at the same time, it will also produce a vibration effect, which can shake off the impurities adhering to the lower surface of the filter screen, and also vibrate the substances adsorbed on the stirring blades, thereby improving the cleanliness of the stirring blades. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure proposed in this invention; Figure 2 This is a schematic diagram of the internal structure of the concentration tank proposed in this invention; Figure 3 This is a schematic diagram of the internal structure of the concentration tank proposed in this invention; Figure 4 This is a schematic diagram of the transmission structure of the threaded rod and tension spring proposed in this invention; Figure 5 This is a schematic diagram of the internal structure of the fixed frame proposed in this invention; Figure 6 This is a schematic diagram of the internal structure of the connecting rod proposed in this invention; Figure 7 This is a schematic diagram of the internal structure of the rotating drum proposed in this invention; Figure 8 The present invention proposes Figure 3 Enlarged view of point A.

[0018] The labels in the attached diagram are as follows: 1. Base; 2. Concentrator; 3. Filtering mechanism; 4. Groove; 5. Stirring mechanism; 6. Resistance mechanism; 7. Connecting rod; 8. Slider; 9. First spring; 10. Protrusion; 11. Second spring; 12. First positioning rod; 13. Sealing plate; 14. Motor; 15. Inlet pipe; 16. Recovery tank; 17. Condenser; 18. Circulation pump; 19. Circulation pipe; 20. Steam delivery pipe; 301. Threaded rod; 302. First mounting plate; 303. Mounting groove; 304. Fixing frame; 305. Ring; 306. First abutment. 307. Second abutment block; 308. Connecting plate; 309. Third spring; 310. Limiting rod; 311. Limiting plate; 312. Fourth spring; 313. Second mounting plate; 314. Second positioning rod; 315. Tension spring; 316. Abutment rod; 317. Filter screen; 501. Mounting base; 502. Third positioning rod; 503. Rotary drum; 504. Rotary ring; 505. Connecting column; 506. Fixing rod; 507. Limiting block; 508. Stirring blade; 601. First fixing plate; 602. Movable block; 603. Fifth spring; 604. Second fixing plate. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] In the description of this invention, it should be understood that the terms "upper," "lower," "top surface," "bottom surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are only used to distinguish an entity or operation from another entity or operation, and do not require or imply any actual relationship, order, or relative importance between these entities or operations.

[0021] Example 1, please refer to Figures 1-6A waste sulfuric acid concentration and recycling device includes a base 1, a concentration tank 2 installed on the top of the base 1, and a filter mechanism 3 installed inside the concentration tank 2. Two slots 4 are opened on the inner wall of the base 1. An inlet pipe 15 is fixedly installed through the bottom of the concentration tank 2. A recycling tank 16 is fixedly installed on the top of the base 1, and a condenser 17 is fixedly installed on the top of the recycling tank 16. A circulation pump 18 is fixedly installed on the top of the base 1, and circulation pipes 19 are fixedly installed at both ends of the circulation pump 18. The input end of the circulation pump 18 is connected to the inside of the recycling tank 16 through the circulation pipe 19, and the output end of the circulation pump 18 is connected to the inside of the first positioning rod 12 through the circulation pipe 19. A steam conveying pipe 20 is fixedly installed through the top of the concentration tank 2, and the end of the steam conveying pipe 20 away from the concentration tank 2 is fixedly installed at the input end of the condenser 17. One-way valves are installed inside the inlet pipe 15 and the circulation pipe 19. The filter mechanism 3 includes a first mounting plate 302 to filter the vaporized sulfuric acid during waste sulfuric acid concentration and recycling. Furthermore, the filter mechanism 3 includes a threaded rod 301, a first mounting plate 302 slidably connected to the outer wall of the threaded rod 301, a mounting groove 303 opened on the top of the first mounting plate 302, and a fixed frame 304 fixedly connected to the inner wall of the fixed frame 304. Two first abutments 306 are slidably connected through the outer wall of the fixed frame 304. A ring 305 is fixedly connected to the top of the fixed frame 304, and two second abutments 307 are slidably connected through the outer wall of the ring 305. A connecting plate 308 is fixedly connected to the outer walls of the first abutments 306 and the second abutments 307 located on the same side of the fixed frame 304. A third spring 309 is fixedly connected between the opposite sides of the two connecting plates 308. The outer wall of 304 is slidably connected to a limiting rod 310, and the outer wall of the limiting rod 310 located inside the fixed frame 304 is fixedly connected to a limiting plate 311. The outer wall of the limiting rod 310 located inside the fixed frame 304 is fixedly connected to a fourth spring 312. The inner walls of the two slots 4 are fixedly connected to second positioning rods 314. The outer walls of the two second positioning rods 314 are slidably connected to a second mounting plate 313. The inner walls of the two slots 4 and the corresponding positions of the outer walls of the second positioning rods 314 are fixedly connected to tension springs 315. The inner wall of the base 1 is fixedly connected to a stop rod 316. The outer wall of the first mounting plate 302 and the inner wall of the second mounting plate 313 are fixedly installed together with a filter screen 317. Furthermore, the outer wall of the threaded rod 301 is provided with a threaded groove that engages with the end of the limiting rod 310. The end slope of the first abutment 306 corresponds to the side wall of the limiting plate 311, and the end slope of the second abutment 307 corresponds to the side wall of the abutment rod 316. The outer wall of the limiting plate 311 is slidably connected to the inner wall of the fixed frame 304. The end of the fourth spring 312 away from the limiting rod 310 is fixedly connected to the inner wall of the fixed frame 304. The outer wall of the second mounting plate 313 slides against the inner wall of the base 1. The bottoms of the two tension springs 315 are fixedly connected to the top of the second mounting plate 313. The outer wall of the abutment rod 316 corresponds to the inner wall of the ring 305. The top of the concentration tank 2 is fixedly mounted with a motor 14. The end of the threaded rod 301 away from the limiting block 507 is fixedly mounted on the output shaft of the motor 14. More specifically, due to the low utilization rate of sulfuric acid in some applications, direct discharge of this waste sulfuric acid would not only cause acidification of water bodies or soil, posing a serious threat to the ecological environment, but also result in a large waste of resources. Therefore, waste sulfuric acid needs to be concentrated and recycled. Waste sulfuric acid concentration and recycling removes water and impurities from the waste sulfuric acid through physical or chemical methods, increasing the sulfuric acid concentration to a reusable level, while simultaneously achieving resource recycling and pollution reduction. The waste sulfuric acid is steamed by heating, which is the core step in the waste sulfuric acid concentration and recycling process. This causes the water in the waste sulfuric acid to evaporate, thereby increasing the sulfuric acid concentration. After the steam is cooled, pure water or low-boiling-point acid can be separated, while the concentrated sulfuric acid remains in the device for further concentration until the target concentration is reached.

[0022] When waste sulfuric acid needs to be recycled, the waste sulfuric acid is first added into the concentrator 2 through the inlet pipe 15. The concentrator 2 is heated by driving the concentrator 2, which is a common model on the market with a heating function. It can heat the waste sulfuric acid inside to a vapor state. The vaporized waste sulfuric acid then flows into the condenser 17 through the steam delivery pipe 20. The steam generated by evaporation enters the condenser 17, and pure water is separated and recycled during this process. At the same time, the concentrated sulfuric acid will return to a liquefied state after cooling and then enter the circulation pump 18 for storage for later recycling. If the concentrated sulfuric acid does not reach the specified concentration, the sulfuric acid can be transported to the concentrator 2 for further concentration by driving the circulation pump 18.

[0023] When waste sulfuric acid is heated to vaporization, the steam will rise inside the concentration tank 2. During this process, the steam will pass through the inside of the filter screen 317 before flowing into the steam delivery pipe 20. Since the waste sulfuric acid contains impurities and the pore diameter of the filter screen 317 is small, the impurities adsorbed by the steam will be filtered down by the filter screen 317 when the steam passes through the inside of the filter screen 317, so that the impurities remain on the lower surface of the filter screen 317, thereby improving the purity of the sulfuric acid. Because impurities will remain on the filter screen 317, prolonged use may clog the pores of the filter screen 317. During the recycling process, the drive motor 14 outputs power, causing its output shaft to drive the threaded rod 301 to rotate synchronously. Since the end of the limiting rod 310 slides within the threaded groove on the outer wall of the threaded rod 301, the rotation of the threaded rod 301 will cause the limiting rod 310 to move downwards. Then, the threaded rod 301 will drive the first mounting plate 302 to move synchronously through the fixed frame 304. Simultaneously, the filter screen 317 and the second mounting plate 313 will move synchronously with the first mounting plate 302. During this process, the second mounting plate 313 will slide along the outer wall of the second positioning rod 314 to ensure that the outer wall of the second mounting plate 313 remains in contact with the base 1. The inner wall is fitted, and the tension spring 315 is compressed. When the limiting rod 310 slides to the bottom along the threaded groove, the end of the limiting rod 310 will be squeezed, which will drive the limiting plate 311 to slide along the inner wall of the fixed frame 304, causing the fourth spring 312 to be compressed. At the same time, the outer wall of the limiting plate 311 will correspond to the inclined surface of the end of the first abutment 306, causing the first abutment 306 to slide away from the inside of the fixed frame 304. Then the first abutment 306 will drive the connecting plate 308 to move synchronously and cause the third spring 309 to be stretched. After that, the limiting plate 311 will pass over the inclined surface of the first abutment 306. At this time, the tension of the third spring 309 will drive the connecting plate 308 and the first abutment 306 to reset, so that the first abutment 306 limits the limiting plate 311. Since the limiting rod 310 will disengage from the threaded groove of the threaded rod 301 after displacement, the second mounting plate 313 will slide upward along the inner wall of the concentration tank 2 through the tension of the two tension springs 315. Since the diameter of the air hole of the filter screen 317 is small and the tension of the tension spring 315 is released instantaneously, when the second mounting plate 313 drives the filter screen 317 and the first mounting plate 302 to reset and move, the space above the displacement filter screen 317 inside the concentration tank 2 is compressed, so that the air will quickly pass through the air hole of the filter screen 317. The rapidly passing airflow can blow away the impurities adsorbed inside the air hole and the lower surface of the filter screen 317, thereby achieving the function of automatically cleaning the filter screen 317 and avoiding the problem of filter screen blockage caused by the accumulation of impurities, which would affect the concentration and recovery processing of waste sulfuric acid. During the downward displacement of the filter screen 317 by the first mounting plate 302, the downward speed is not too fast, so no compression effect is applied to the air during the descent. When the first mounting plate 302 is slid and reset along the outer wall of the threaded rod 301 by the tension spring 315, the inner wall of the ring 305 will slide to the outer wall of the abutment rod 316. Then the end of the abutment rod 316 will contact the end slope of the second abutment block 307 and press it, causing the second abutment block 307 to drive the first abutment block 306 to slide outward through the connecting plate 308. After that, the first abutment block 306 no longer limits the limiting plate 311. Then, the elastic force of the fourth spring 312 drives the limiting plate 311 to slide and reset along the inner wall of the fixed frame 304. At the same time, it will drive the end of the limiting rod 310 to slide back into the thread groove on the outer wall of the threaded rod 301. After that, the rotation of the threaded rod 301 can drive the limiting rod 310 to move downward again. During the concentration process, the sealing plate 13 will slide naturally along the outer wall of the first positioning rod 12, no longer blocking the end of the steam conveying pipe 20 located inside the concentration tank 2. Steam can be discharged from the steam conveying pipe 20. When the second mounting plate 313 moves downward, it will drive the connecting rod 7 to move synchronously. When the second mounting plate 313 has finished moving downward, the first spring 9 is stretched to its limit. Then, the slider 8 will be pulled by the first spring 9, causing the protrusion 10 to be limited by the sealing plate 13. After the protrusion 10 slides into the inside of the slider 8, the slider 8 will move to a height lower than the sealing plate 13. Then, the protrusion 10 will be reset and slid by the elastic force of the slider 8. Afterward, when the second mounting plate 313 rises, it will be connected to the connecting rod 7. Rod 7 drives slider 8 to press protrusion 10 against the bottom of sealing plate 13, causing sealing plate 13 to slide upward along the outer wall of first positioning rod 12 to the end of steam conveying pipe 20, thereby sealing steam conveying pipe 20. At this time, concentration tank 2 is in a sealed space, ensuring air compression during subsequent cleaning of filter screen 317. After the second mounting plate 313 is reset, the first spring 9 is compressed to the limit device, and then protrusion 10 slides into the inside of slider 8. Then slider 8 will slide along the inner wall of connecting rod 7 to a height higher than sealing plate 13, and sealing plate 13 is no longer compressed, thereby canceling the seal on the end of steam conveying pipe 20, and waste sulfuric acid concentration and recovery can be carried out normally.

[0024] Example 2, please refer to Figures 1-7Based on Embodiment 1, in this embodiment, a stirring mechanism 5 is provided at the bottom of the first mounting plate 302 to stir and mix the waste sulfuric acid in multiple directions during the concentration and recovery of waste sulfuric acid. The stirring mechanism 5 includes a mounting base 501, and a third positioning rod 502 is fixedly connected to the top of the mounting base 501. A rotating cylinder 503 is sleeved on the outer wall of the third positioning rod 502. A rotating ring 504 is rotatably connected to the outer wall of the rotating cylinder 503, and two connecting columns 505 are fixedly connected to the top of the rotating ring 504. A fixing rod 506 is provided through the inside of the rotating cylinder 503. A limit block 507 is fixedly connected to the outer wall of one end of the threaded rod 301. Several stirring blades 508 are fixedly installed on the outer wall of the rotating cylinder 503. Furthermore, the bottom of the mounting base 501 is fixedly connected to the bottom of the inner wall of the concentration tank 2, the ends of the two connecting columns 505 away from the rotating ring 504 are fixedly connected to the bottom of the first mounting plate 302, and the threaded rod 301 is slidably connected to the inner wall of the fixed rod 506 at one end connected to the limit block 507. More specifically, during the concentration and recovery of waste sulfuric acid, while the threaded rod 301 is rotated by the drive motor 14, the threaded rod 301 slides inside the fixed rod 506 through the limit block 507, causing the rotating drum 503 to rotate synchronously with the threaded rod 301. Then, the rotating drum 503 will drive several stirring blades 508 to stir the waste sulfuric acid inside the concentration tank 2, thereby making the waste sulfuric acid flow inside the concentration tank 2, which can make the waste sulfuric acid be heated more evenly, shorten the heating process of concentration, and improve the recycling efficiency of waste sulfuric acid. As the threaded rod 301 rotates, it drives the first mounting plate 302 to reset and move up and down. At the same time, the connecting column 505 drives the rotating ring 504 to move up and down synchronously, so that the rotating ring 504 drives the rotating drum 503 and the stirring blade 508 to move synchronously. During the up and down movement of the rotating drum 503, its bottom will slide along the outer wall of the mounting base 501, which can ensure that the position of the rotating drum 503 will not shift, improve the stirring range of the stirring blade 508 inside the concentration tank 2, further ensure that the waste sulfuric acid is heated evenly, and prevent local overheating or scaling.

[0025] Example 3, please refer to Figures 1-8Based on Embodiment 2, in this embodiment, the inner wall of the slot 4 is provided with a resistance mechanism 6 to resist the displacement of the filter mechanism 3 and the stirring mechanism 5 during the waste sulfuric acid concentration and recovery, so that the waste sulfuric acid adsorbed on their surface is shaken off. The resistance mechanism 6 includes a first fixed plate 601, and a plurality of movable blocks 602 are slidably connected through the side wall of the first fixed plate 601. A fifth spring 603 is fixedly connected to the end of each of the movable blocks 602 away from the second positioning rod 314. A second fixed plate 604 is fixedly connected to the end of each of the fifth springs 603 away from the movable blocks 602. The outer wall of the first fixed plate 601 is fixedly connected to the inner wall of the slot 4. The inclined surface of the end of each of the movable blocks 602 corresponds to the outer wall of the second mounting plate 313. The outer wall of the second fixed plate 604 is fixedly connected to the inner wall of the slot 4. Furthermore, a connecting rod 7 is fixedly connected to the top of the second mounting plate 313, and a slider 8 is slidably connected to the inner wall of the connecting rod 7. A first spring 9 is fixedly connected to the bottom of the slider 8, and the end of the first spring 9 away from the slider 8 is fixedly connected to the inner wall of the connecting rod 7. A protrusion 10 is slidably connected through the inner wall of the slider 8, and a second spring 11 is fixedly connected to one end of the protrusion 10. The end of the second spring 11 away from the protrusion 10 is fixedly connected to the inner wall of the slider 8. Two first positioning rods 12 are fixedly connected to the inner wall of the base 1. A sealing plate 13 is slidably connected to the outer walls of the two first positioning rods 12, and the interior of the sealing plate 13 is slidably connected through the outer wall of the connecting rod 7. More specifically, during the upward reset of the second mounting plate 313 by the tension of the spring 315, its outer wall will contact the inclined end of the movable block 602. The subsequent displacement process will compress it, causing the compressed movable block 602 to slide along the inside of the first fixed plate 601 towards the second fixed plate 604. At the same time, the corresponding fifth spring 603 is compressed. During this process, the second mounting plate 313 will experience a certain resistance, thereby slowing down the reset speed of the second mounting plate 313. Afterwards, when the second mounting plate 313 passes the corresponding movable block 602, the resistance experienced by the second mounting plate 313 disappears, and the reset speed of the second mounting plate 313 will increase. This speed change causes the compressed air to spray into the air holes of the filter screen 317, and also produces a vibration effect, which can shake off the impurities adhering to the lower surface of the filter screen 317. By setting multiple movable blocks 602, the reset process of the second mounting plate 313 is divided into multiple stages, further improving the cleaning effect of the filter screen 317. As the stirring blade 508 moves up and down synchronously with the second mounting plate 313, the vibration generated by the variable reset speed of the second mounting plate 313 can also vibrate the material adsorbed on the stirring blade 508, thereby improving the cleanliness of the stirring blade 508.

[0026] The working principle of this invention is as follows: Waste sulfuric acid is added into the interior of the concentration tank 2 through the inlet pipe 15. The concentration tank 2 is a common model on the market with a heating function, which can heat the waste sulfuric acid inside to a vapor state. The vaporized waste sulfuric acid then flows into the interior of the condenser 17 through the steam delivery pipe 20. After the steam generated by evaporation enters the condenser 17, pure water is separated and recycled during this process. At the same time, the concentrated sulfuric acid will return to a liquefied state after cooling and then enter the interior of the circulation pump 18 for storage and subsequent recycling. If the concentrated sulfuric acid does not reach the specified concentration, the sulfuric acid can be transported to the interior of the concentration tank 2 for further concentration by driving the circulation pump 18. During the recycling process, the drive motor 14 outputs power, causing its output shaft to drive the threaded rod 301 to rotate synchronously. Since the end of the limiting rod 310 slides within the threaded groove on the outer wall of the threaded rod 301, the rotation of the threaded rod 301 causes the limiting rod 310 to move downwards. Then, the threaded rod 301, through the fixed frame 304, drives the first mounting plate 302 to move synchronously. Simultaneously, the filter screen 317 and the second mounting plate 313 move synchronously with the first mounting plate 302. During this process, the second mounting plate 313 slides along the outer wall of the second positioning rod 314 to ensure that the outer wall of the second mounting plate 313 always fits against the inner wall of the base 1. At the same time, the tension spring 315 is compressed, and when the limiting rod... After the rod 310 slides to the bottom along the threaded groove, the end of the limiting rod 310 will be squeezed, which will then drive the limiting plate 311 to slide along the inner wall of the fixed frame 304, compressing the fourth spring 312. At the same time, the outer wall of the limiting plate 311 will correspond to the inclined surface of the end of the first abutment 306, causing the first abutment 306 to slide away from the inside of the fixed frame 304. Then the first abutment 306 will drive the connecting plate 308 to move synchronously and stretch the third spring 309. After that, the limiting plate 311 will pass over the inclined surface of the first abutment 306. At this time, the tension of the third spring 309 will drive the connecting plate 308 and the first abutment 306 to reset, so that the first abutment 306 limits the limiting plate 311. Since the limiting rod 310 displaces from the threaded groove of the threaded rod 301 after displacement, the second mounting plate 313 will slide upward along the inner wall of the concentration tank 2 under the tension of the two tension springs 315. Because the pore diameter of the filter screen 317 is small and the tension of the tension springs 315 is released instantaneously, when the second mounting plate 313 moves the filter screen 317 and the first mounting plate 302 to reset, it compresses the space above the displacement filter screen 317 inside the concentration tank 2, allowing air to pass quickly through the pores of the filter screen 317. The rapidly passing airflow can blow away the impurities adsorbed inside the pores and on the lower surface of the filter screen 317, thus achieving the effect of automatically cleaning the filter screen 317 and avoiding the problem of filter screen blockage caused by impurity accumulation, which would affect the concentration and recovery of waste sulfuric acid. During the downward displacement of the filter screen 317 by the first mounting plate 302, the downward speed is not too fast due to the rotation of the thread, so no compression effect is applied to the air during the descent.

[0027] It should be noted that all the devices in this application are common devices on the market, and can be selected according to the needs of specific use. The circuit connection relationship of each device is a simple series and parallel connection circuit. There is no innovation in the circuit connection part. Those skilled in the art can easily implement it. It belongs to the prior art and will not be described in detail.

[0028] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A waste sulfuric acid concentration and recycling device, comprising a base (1), characterized in that: A concentration tank (2) is installed on the top of the base (1), and a filter mechanism (3) is provided inside the concentration tank (2). Two slots (4) are opened on the inner wall of the base (1). An inlet pipe (15) is fixedly installed through the bottom of the concentration tank (2). A recovery tank (16) is fixedly installed on the top of the base (1), and a condenser (17) is fixedly installed on the top of the recovery tank (16). A circulation pump (18) is fixedly installed on the top of the base (1), and circulation pipes (19) are fixedly installed at both ends of the circulation pump (18). The filtration mechanism (3) includes a first mounting plate (302) for filtering vaporized sulfuric acid during waste sulfuric acid concentration and recovery. The bottom of the first mounting plate (302) is provided with a stirring mechanism (5) to stir and mix the waste sulfuric acid from multiple directions; The inner wall of the groove (4) is provided with a resistance mechanism (6) to resist the displacement of the filtration mechanism (3) and the stirring mechanism (5), so that the waste sulfuric acid adsorbed on its surface is shaken off.

2. The waste sulfuric acid concentration and recycling device according to claim 1, characterized in that, The filter mechanism (3) includes a threaded rod (301), a first mounting plate (302) is slidably connected to the outer wall of the threaded rod (301), the top of the first mounting plate (302) is provided with a mounting groove (303), and a fixed frame (304) is fixedly connected to the inner wall of the fixed frame (304). Two first abutments (306) are slidably connected through the outer wall of the fixed frame (304), a ring (305) is fixedly connected to the top of the fixed frame (304), and two second abutments (307) are slidably connected through the outer wall of the ring (305). The outer walls of the first abutments (306) and the second abutments (307) located on the same side of the fixed frame (304) are jointly fixedly connected to a connecting plate (308), and a third spring (309) is jointly fixedly connected between the opposite sides of the two connecting plates (308). The outer wall of (304) is slidably connected to a limiting rod (310), and the outer wall of the limiting rod (310) located inside the fixed frame (304) is fixedly connected to a limiting plate (311). The end of the limiting rod (310) located inside the fixed frame (304) is fixedly connected to a fourth spring (312). The inner walls of the two slots (4) are fixedly connected to a second positioning rod (314). The outer walls of the two second positioning rods (314) are slidably connected to a second mounting plate (313). The inner walls of the two slots (4) and the corresponding positions of the outer walls of the second positioning rods (314) are fixedly connected to a tension spring (315). The inner wall of the base (1) is fixedly connected to a stop rod (316). The outer wall of the first mounting plate (302) and the inner wall of the second mounting plate (313) are fixedly installed together with a filter screen (317).

3. The waste sulfuric acid concentration and recycling device according to claim 2, characterized in that, The outer wall of the threaded rod (301) is provided with a threaded groove that engages with the end of the limiting rod (310). The end slope of the first abutment (306) corresponds to the side wall of the limiting plate (311). The end slope of the second abutment (307) corresponds to the side wall of the abutment rod (316). The outer wall of the limiting plate (311) is slidably connected to the inner wall of the fixed frame (304). The end of the fourth spring (312) away from the limiting rod (310) is fixedly connected to the inner wall of the fixed frame (304). The outer wall of the second mounting plate (313) slides against the inner wall of the base (1). The bottoms of the two tension springs (315) are fixedly connected to the top of the second mounting plate (313). The outer wall of the abutment rod (316) corresponds to the inner wall of the ring (305).

4. The waste sulfuric acid concentration and recycling device according to claim 3, characterized in that, The stirring mechanism (5) includes a mounting base (501), and a third positioning rod (502) is fixedly connected to the top of the mounting base (501). A rotating cylinder (503) is sleeved on the outer wall of the third positioning rod (502). A rotating ring (504) is rotatably connected to the outer wall of the rotating cylinder (503), and two connecting columns (505) are fixedly connected to the top of the rotating ring (504). A fixing rod (506) is provided through the interior of the rotating cylinder (503). A limit block (507) is fixedly connected to the outer wall of one end of the threaded rod (301). Several stirring blades (508) are fixedly installed on the outer wall of the rotating cylinder (503).

5. The waste sulfuric acid concentration and recycling device according to claim 4, characterized in that, The bottom of the mounting base (501) is fixedly connected to the bottom of the inner wall of the concentration tank (2), and the ends of the two connecting columns (505) away from the rotating ring (504) are fixedly connected to the bottom of the first mounting plate (302). The end of the threaded rod (301) connected to the limiting block (507) is slidably connected to the inner wall of the fixing rod (506).

6. The waste sulfuric acid concentration and recycling device according to claim 5, characterized in that, The resistance mechanism (6) includes a first fixed plate (601), and a plurality of movable blocks (602) are slidably connected through the side wall of the first fixed plate (601). A fifth spring (603) is fixedly connected to one end of each of the movable blocks (602) away from the second positioning rod (314). A second fixed plate (604) is fixedly connected to one end of each of the fifth springs (603) away from the movable blocks (602). The outer wall of the first fixed plate (601) is fixedly connected to the inner wall of the slot (4). The inclined surface of the end of each of the movable blocks (602) corresponds to the outer wall of the second mounting plate (313). The outer wall of the second fixed plate (604) is fixedly connected to the inner wall of the slot (4).

7. The waste sulfuric acid concentration and recycling device according to claim 6, characterized in that, The top of the second mounting plate (313) is fixedly connected to a connecting rod (7), and the inner wall of the connecting rod (7) is slidably connected to a slider (8). The bottom of the slider (8) is fixedly connected to a first spring (9), and the end of the first spring (9) away from the slider (8) is fixedly connected to the inner wall of the connecting rod (7). The inner wall of the slider (8) is slidably connected to a protrusion (10), and one end of the protrusion (10) is fixedly connected to a second spring (11). The end of the second spring (11) away from the protrusion (10) is fixedly connected to the inner wall of the slider (8). The inner wall of the base (1) is fixedly connected to two first positioning rods (12), and the outer walls of the two first positioning rods (12) are slidably connected to a sealing plate (13). The interior of the sealing plate (13) is slidably connected to the outer wall of the connecting rod (7).

8. The waste sulfuric acid concentration and recycling device according to claim 7, characterized in that, A motor (14) is fixedly installed on the top of the concentration tank (2), and the end of the threaded rod (301) away from the limiting block (507) is fixedly installed on the output shaft of the motor (14).

9. The waste sulfuric acid concentration and recycling device according to claim 8, characterized in that, The input end of the circulating pump (18) is connected to the inside of the recovery tank (16) through the circulating pipe (19), and the output end of the circulating pump (18) is connected to the inside of the first positioning rod (12) through the circulating pipe (19). A steam delivery pipe (20) is fixedly installed through the top of the concentration tank (2), and the end of the steam delivery pipe (20) away from the concentration tank (2) is fixedly installed at the input end of the condenser (17). A one-way valve is provided inside both the liquid inlet pipe (15) and the circulating pipe (19).

Images