A modular multi-stage filtering and impurity removing device for diluting sulfuric acid

Abstract

The present application relates to the technical fields of sulfuric acid processing, and discloses a modular sulfuric acid dilution multi-stage filtering and impurity removing device, which comprises a bottom plate, wherein the micro-porous uniform spraying structure is adopted to spray and disperse high-concentration concentrated sulfuric acid and dilution water mist, so that low-speed and low-pressure preliminary mixing is realized, the local concentration difference of the solution is greatly reduced, direct collision of concentrated sulfuric acid and water is avoided from the root to avoid violent heat release, and the production safety of the dilution process is significantly improved. Since there is no local overheating phenomenon, carbonization of sulfuric acid organic impurities caused by high temperature and agglomeration of small solid impurities caused by high temperature can be avoided, the impurity removing pressure of the subsequent filtering unit is reduced, the layered interception of coarse particles, micro-suspended particles and colloidal impurities is adopted, the impurity removal is more thorough, the residual amount of impurities in the finished product is effectively reduced, the pipeline fluid self-driving and self-cleaning structure is newly added, the online uninterrupted impurity removal of the primary filter screen is realized by using the fluid power of the material itself. In addition, the filtering assembly can be quickly disassembled, cleaned and replaced.

Description

Technical Field

[0001] This invention relates to the field of sulfuric acid processing technology, specifically to a modular sulfuric acid dilution multi-stage filtration and impurity removal device. Background Technology

[0002] Sulfuric acid, as a basic raw material in the chemical industry, is widely used in many fields such as metallurgy, electroplating, pharmaceuticals, fine chemicals, and new material preparation. The concentrated sulfuric acid raw materials purchased in industrial production and the sulfuric acid solutions recovered during the production process generally contain solid particles, suspended impurities, colloidal precipitates, and trace amounts of insoluble impurities. At the same time, the direct use of high-concentration sulfuric acid has problems such as strong corrosiveness, violent reaction, and poor controllability. It is necessary to perform precise dilution and efficient impurity removal treatment in order to meet the standards for use in refined production and high-purity reagent preparation.

[0003] In the sulfuric acid dilution process, existing equipment mostly uses single-spray mixing or static dilution methods. Uneven mixing of concentrated sulfuric acid and dilution water, coupled with excessively high local concentrations, can easily lead to violent exothermic reactions. This not only poses safety hazards but also causes localized overheating, resulting in sulfuric acid carbonization and impurity agglomeration, further increasing the difficulty of subsequent impurity removal. Dilution accuracy is difficult to control, and the concentration stability of the finished sulfuric acid is poor. Furthermore, in the filtration and impurity removal stage, traditional equipment often uses a single-stage filtration structure, which can only intercept large solid particles. It cannot effectively remove fine suspended particles and colloidal impurities, resulting in low impurity removal accuracy and incomplete removal, failing to meet the production requirements of high-purity sulfuric acid. At the same time, the filter elements and plates in traditional filtration structures are fixed, making disassembly, cleaning, replacement, and maintenance processes cumbersome and severely impacting continuous production efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a modular multi-stage sulfuric acid dilution filtration and impurity removal device, which solves the problems of poor sulfuric acid concentration stability and cumbersome disassembly and assembly of the filter structure in existing multi-stage sulfuric acid dilution filtration and impurity removal devices.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a modular sulfuric acid dilution multi-stage filtration and impurity removal device, including a base plate, wherein a dilution component and a quick-release component are provided on the base plate, the dilution component is used for safe dilution of sulfuric acid, and the quick-release component can realize the quick assembly and disassembly of the filtration component;

[0006] The quick-release assembly includes a second filter tube and a sleeve. A filter sleeve is embedded in the second filter tube. Multiple support plates are uniformly fixed along the circumference of the inner wall of the second filter tube. A top column is fixedly connected to one end of the support plate near the filter sleeve. The sleeve is fixedly connected to the filter sleeve. Two telescopic grooves are symmetrically opened on the inner wall of the sleeve. A telescopic rod is slidably connected in the telescopic groove. The inner end of the telescopic rod extends from the outside of the sleeve through the sleeve wall into the telescopic groove. A sliding rod is fixedly connected to one end of the top column near the sleeve. A first platform is fixedly connected to one end of the sliding rod away from the top column. A locking block is fixedly connected to one end of each telescopic rod near the first platform, and the locking block engages with the first platform.

[0007] The dilution component includes a mixing hopper, with two injection pipes symmetrically installed on the upper end of the mixing hopper. A spray head is fixedly connected to one end of the injection pipe inside the mixing hopper. A flow guide baffle is fixedly connected inside the mixing hopper, located below the spray head. The flow guide baffle has multiple flow guide holes evenly opened along the circumference.

[0008] Preferably, a rotating shaft is rotatably connected inside the mixing hopper, the rotating shaft is rotatably connected to the guide baffle, and a stirring blade is fixedly connected to the outer wall of the rotating shaft, the stirring blade being located below the guide baffle.

[0009] Preferably, a discharge valve is fixedly connected to the discharge end of the mixing hopper, and a stirring frame is fixedly connected to the end of the rotating shaft near the discharge valve.

[0010] Preferably, a first filter tube is fixedly connected to the upper surface of the base plate, and the first filter tube is suspended above the base plate. A primary filter screen, a medium-efficiency filter plate, and a precision filter plate are embedded and installed at intervals inside the filter sleeve. A flange is fixedly connected to the connection between the first filter tube and the second filter tube, and multiple bolts are evenly installed on the flange along the circumference.

[0011] Preferably, a fixing plate is welded and fixed to the inner wall of the first filter tube, and a shaft is rotatably connected to the center of the fixing plate.

[0012] Preferably, an impeller is fixedly connected to one end of the shaft, and a brush plate is fixedly connected to the other end of the shaft. The brush bristles abut against the primary filter screen, and the bristles are arranged along the fluid flow gap.

[0013] Preferably, a second body is slidably connected to the outer wall of the slide rod, and a return spring is sleeved on the outer wall of the top column, with the return spring abutting against the sleeve.

[0014] Preferably, a compression spring is fitted on the outer wall of the telescopic rod, and the two ends of the compression spring abut against the locking block and the telescopic groove, respectively.

[0015] Preferably, a support frame, a shell-and-tube heat exchanger, and a transfer tank are fixedly connected to the upper surface of the base plate. The support frame is fixedly connected to the mixing hopper. One end of the shell-and-tube heat exchanger is connected to the mixing hopper through a pipe, and the other end is connected to the transfer tank through a pipe. A sulfuric acid concentration meter is inserted through the side wall of the mixing hopper, and the detection probe of the sulfuric acid concentration meter extends into the inner cavity of the mixing hopper for real-time detection of sulfuric acid concentration.

[0016] Preferably, a power pump and a storage tank are fixedly connected to the upper surface of the base plate. The input end of the power pump is connected to the transfer tank, and the output end of the power pump is fixedly connected to an input pipe. The input pipe is connected to a first filter pipe, and the second filter pipe is connected to the storage tank.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In this invention, a microporous uniform spray structure is adopted, which can atomize and disperse high-concentration sulfuric acid and dilution water, achieving low-speed and low-pressure initial mixing, significantly reducing the local concentration difference of the solution, avoiding the violent exothermic reaction between concentrated sulfuric acid and water, eliminating safety accidents such as boiling and acid spraying, and significantly improving the production safety of the dilution process. Since there is no local overheating, it can avoid the carbonization of organic impurities in sulfuric acid and the agglomeration of small solid impurities due to heat caused by high temperature. The dispersion of impurities in the diluted solution is stable, greatly reducing the difficult-to-remove carbon compounds and agglomerated colloids, reducing the impurity removal pressure of the subsequent filtration unit, and simplifying the high-purity sulfuric acid purification process.

[0019] 2. This invention employs a gradient multi-stage filtration system to replace traditional single-stage filtration. This system intercepts coarse particles, micro-suspended particles, and colloidal impurities in layers, resulting in more thorough impurity removal and effectively reducing the amount of residual impurities in the finished product. A new self-driving and self-cleaning structure for the pipeline utilizes the material's own fluid dynamics to achieve continuous online cleaning of the primary filter screen, requiring no additional energy consumption or downtime maintenance. This significantly reduces the probability of filter clogging and the cost of consumable replacement. Furthermore, the filter components are designed for quick disassembly and assembly, allowing for rapid disassembly, cleaning, and replacement operations. This significantly shortens downtime maintenance, reduces production interruptions, and effectively improves the continuous operation efficiency of the entire production line. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a modular sulfuric acid dilution multi-stage filtration and impurity removal device according to the present invention;

[0021] Figure 2 This is a cross-sectional view of the mixing hopper of a modular sulfuric acid dilution multi-stage filtration and impurity removal device according to the present invention.

[0022] Figure 3 This is a cross-sectional view of the flow guide baffle of a modular sulfuric acid dilution multi-stage filtration and impurity removal device according to the present invention.

[0023] Figure 4 This is a schematic diagram of the power pump structure of a modular sulfuric acid dilution multi-stage filtration and impurity removal device according to the present invention;

[0024] Figure 5 This is a cross-sectional view of the second filter tube of a modular sulfuric acid dilution multi-stage filtration and impurity removal device according to the present invention.

[0025] Figure 6 This is a cross-sectional view of the filter sleeve of a modular sulfuric acid dilution multi-stage filtration and impurity removal device according to the present invention.

[0026] Figure 7 This is a cross-sectional view of the sleeve structure of a modular sulfuric acid dilution multi-stage filtration and impurity removal device according to the present invention.

[0027] In the diagram: 1. Base plate; 2. Power pump; 3. Transfer tank; 4. Shell-and-tube heat exchanger; 5. Mixing hopper; 6. Sulfuric acid concentration meter; 7. Discharge valve; 8. Support frame; 9. Storage tank; 10. Inlet pipe; 11. First filter pipe; 12. Second filter pipe; 13. Injection pipe; 14. Spray head; 15. Baffle plate; 16. Rotating shaft; 17. Stirring blades; 18. Stirring frame; 19. Return spring; 20. Flow guide 21. Hole; 22. Flange; 23. Bolt; 24. Filter sleeve; 25. Impeller; 26. Fixing plate; 27. Shaft; 28. Brush plate; 29. ​​Primary filter screen; 30. Sleeve; 31. Support plate; 32. Medium-efficiency filter plate; 33. Precision filter plate; 34. First unit; 35. Telescopic rod; 36. Telescopic groove; 37. Compression spring; 38. Locking block; 39. Slide rod; 40. Top column. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] refer to Figures 1-7 The illustrated modular sulfuric acid dilution and multi-stage filtration device includes a base plate 1, on which a dilution assembly and a quick-release assembly are mounted. The dilution assembly is used for the safe dilution of sulfuric acid, and the quick-release assembly allows for the rapid assembly and disassembly of the filtration assembly. A specific embodiment is shown below:

[0030] Example 1

[0031] A support frame 8, a shell-and-tube heat exchanger 4, and a transfer tank 3 are fixedly connected to the upper surface of the base plate 1. The support frame 8 is fixedly connected to the mixing hopper 5. A sulfuric acid concentration meter 6 is inserted through the side wall of the mixing hopper 5, and the detection probe of the sulfuric acid concentration meter 6 extends into the inner cavity of the mixing hopper 5 for real-time detection of sulfuric acid concentration. A power pump 2 and a storage tank 9 are fixedly connected to the upper surface of the base plate 1. The input end of the power pump 2 is connected to the transfer tank 3, and the output end of the power pump 2 is fixedly connected to an input pipe 10. The input pipe 10 is connected to the first filter pipe 11, and the second filter pipe 12 is connected to the storage tank 9. The dilution assembly includes the mixing hopper 5, and the upper end of the mixing hopper 5 is connected to... It is said that two injection pipes 13 are installed. One end of the injection pipe 13 located inside the mixing hopper 5 is fixedly connected to a spray head 14. A flow guide baffle 15 is fixedly connected inside the mixing hopper 5. The flow guide baffle 15 is located below the spray head 14. The flow guide baffle 15 has multiple flow guide holes 20 evenly opened along the circumference. A rotating shaft 16 is rotatably connected inside the mixing hopper 5. The rotating shaft 16 is rotatably connected to the flow guide baffle 15. A stirring blade 17 is fixedly connected to the outer wall of the rotating shaft 16. The stirring blade 17 is located below the flow guide baffle 15. A discharge valve 7 is fixedly connected to the discharge end of the mixing hopper 5. A stirring frame 18 is fixedly connected to the end of the rotating shaft 16 near the discharge valve 7.

[0032] Two independent injection pipes 13 are symmetrically installed at the upper end of the mixing hopper 5, corresponding to the concentrated sulfuric acid feed line and the dilution pure water feed line respectively. The two feed lines are independent and do not interfere with each other, enabling precise proportioning. The mixing hopper 5 is connected to the shell-and-tube heat exchanger 4 via a discharge valve 7. The output end of the shell-and-tube heat exchanger 4 is connected to the transfer tank 3. The flow guide baffle 15 is fixed in the middle section inside the mixing hopper 5, completely dividing the internal cavity of the mixing hopper 5 into two independent upper and lower cavities. The upper part forms a pre-mixing cavity, and the lower part forms a further mixing cavity, realizing graded and zoned dilution operations. Each injection pipe 13 is fixedly equipped with a spray head 14 at the bottom end of its insertion into the mixing hopper 5, and the spray head 14 is located in the upper pre-mixing section. Inside the cavity, the fluid is atomized and dispersed by a microporous spray structure to achieve low-speed, low-pressure premixing. This avoids the problems of instantaneous high temperature, liquid splashing, and impurity agglomeration caused by direct mixing of high-concentration sulfuric acid and water. The flow guide baffle 15 has multiple sets of inclined flow guide holes 20 evenly arrayed along its circumference. This can evenly distribute and limit the flow of the premixed sulfuric acid solution sprayed in the upper premixing cavity, effectively prolonging the premixing residence time, buffering the dilution exothermic reaction, and avoiding the problem of uneven mixing caused by direct fluid flow.

[0033] The stirring blades 17 are made of corrosion-resistant PTFE, forming a lower dynamic turbulent mixing structure. Under the agitation of the stirring blades 17, the premixed sulfuric acid solution forms a three-dimensional turbulent field in the lower cavity of the mixing hopper 5, completely eliminating concentration stratification and localized uneven concentration, achieving precise and uniform dilution. The bottom of the rotating shaft 16, near the discharge end of the mixing hopper 5, is fixedly connected to the stirring frame 18, which can assist in stirring the solution collected at the bottom, improving overall mixing uniformity and eliminating concentration deviations at the bottom. During stirring, a sulfuric acid concentration meter 6 is inserted through the side wall of the mixing hopper 5, with its probe extending into the inner cavity of the mixing hopper 5. This allows for real-time online monitoring of the sulfuric acid solution concentration during dilution, providing real-time feedback of concentration data to the intelligent control system, enabling dynamic fine-tuning of the dilution ratio and ensuring dilution accuracy. The diluted sulfuric acid solution can be rapidly cooled through a shell-and-tube heat exchanger 4, precisely controlling the temperature of the diluted solution and avoiding high-temperature corrosion and material deterioration. After cooling, the diluted solution enters the transfer tank 3, and the power pump 2 stably delivers the cooled dilute sulfuric acid solution to the multi-stage filtration process, forming a continuous dilution and delivery process.

[0034] Example 2

[0035] A first filter tube 11 is fixedly connected to the upper surface of the base plate 1, and the first filter tube 11 is suspended above the base plate 1. A primary filter screen 28, a medium-efficiency filter plate 31, and a precision filter plate 32 are embedded in the filter sleeve 23 at intervals. A flange 21 is fixedly connected to the connection between the first filter tube 11 and the second filter tube 12. Multiple bolts 22 are evenly installed on the flange 21 along the circumference. A fixing plate 25 is welded and fixed to the inner wall of the first filter tube 11. A shaft 26 is rotatably connected to the center of the fixing plate 25. An impeller 24 is fixedly connected to one end of the shaft 26, and a brush plate 27 is fixedly connected to the other end of the shaft 26. The bristles of the brush plate 27 abut against the primary filter screen 28, and the bristles are arranged along the fluid flow gap.

[0036] The first filter tube 11 and the second filter tube 12 are connected end to end to form a multi-stage filtration channel. The second filter tube 12 at the end is connected to the storage tank 9. The high-purity sulfuric acid after filtration and purification can be directly transported to the storage tank 9 for sealed storage. The two-stage filter tubes are fitted with filter sleeves 23. The filter sleeves 23 are fitted with a primary filter screen 28, a medium-efficiency filter plate 31, and a precision filter plate 32 in sequence along the fluid flow direction, forming a gradient three-stage filtration system from coarse to fine. This system intercepts large particles, fine suspended particles, and colloidal trace impurities step by step, solving the problems of incomplete impurity removal and easy clogging of precision filter media in traditional single-stage filtration. The primary filter screen 28, the medium-efficiency filter plate 31, and the precision filter plate 32 are all made of PTFE / PPH corrosion-resistant material, with no metal precipitation and no contamination of the sulfuric acid medium. During equipment operation, the dilute sulfuric acid fluid flowing in the conveying pipeline continuously impacts the impeller 24, driving the impeller 24, shaft 26, and brush plate 27 to rotate at a uniform speed. The entire process requires no electric drive or manual intervention. The end face of the brush plate 27 is surrounded by high-density PTFE integrated bristles. In the rotating state, the bristles of the brush plate 27 continuously scrape the surface of the primary filter screen 28, and the bristles are arranged along the fluid flow gap, without obstructing the main filtration flow area, thus avoiding reducing the fluid flow rate. It also removes attached and accumulated particulate impurities and colloidal scale in real time, preventing the filter screen pores from becoming clogged and the filtration resistance from increasing, thus achieving online uninterrupted self-cleaning operation during the production process.

[0037] Example 3

[0038] The quick-release assembly includes a second filter tube 12 and a sleeve 29. A filter sleeve 23 is embedded inside the second filter tube 12. Multiple support plates 30 are evenly fixed along the circumference of the inner wall of the second filter tube 12. A top post 40 is fixedly connected to one end of the support plate 30 near the filter sleeve 23. The sleeve 29 is fixedly connected to the filter sleeve 23. Two telescopic grooves 35 are symmetrically opened on the inner wall of the sleeve 29. A telescopic rod 34 is slidably connected in the telescopic groove 35. The inner end of the telescopic rod 34 extends from the outside of the sleeve 29 through the sleeve wall into the inside of the telescopic groove 35. A sliding rod 38 is fixedly connected to one end of the top column 40 near the sleeve 29. A first platform 33 is fixedly connected to the end of the sliding rod 38 away from the top column 40. A locking block 37 is fixedly connected to the end of each telescopic rod 34 near the first platform 33, and the locking block 37 is engaged with the first platform 33. A second platform 39 is slidably connected to the outer wall of the sliding rod 38. A return spring 19 is sleeved on the outer wall of the top column 40 and abuts against the sleeve 29. A compression spring 36 is sleeved on the outer wall of the telescopic rod 34, and the two ends of the compression spring 36 abut against the locking block 37 and the telescopic groove 35, respectively.

[0039] The disassembly and assembly of filter sleeve 23 must be performed after the equipment has been shut down and the pipeline has been completely depressurized. Disassembly and assembly are prohibited under pressurized filtration conditions.

[0040] Disassembly procedure: Remove from flange 21. Press filter sleeve 23 from flange 21. Filter sleeve 23 synchronously drives sleeve 29 to move. The movement of 29 pushes the return spring 19 to compress. The return spring 19 is pushed by the reaction force of support plate 30 to slide the second platform 39 along the outer wall of slide rod 38 until the second platform 39 abuts against the top column 40. At this time, the two side blocks 37 move towards the telescopic groove 35 inside 29 under the pressure of the second platform 39. The compression spring 36 is compressed by force, and the telescopic rod 34 extends under the pushing force. The blocks 37 abut against the second platform 39. The two blocks 37 clamp the second platform 39 and pull the filter sleeve 23 in the opposite direction. When the side wall of the first platform 33 is pushed open 37, continue to pull the filter sleeve 23. The blocks 37 pass the abutting end of the first platform 33 and the second platform 39, and the disassembly of filter sleeve 23 is completed.

[0041] Installation process: Insert the filter sleeve 23 along the inner wall of the second filter tube 12. The inclined wall of the locking block 37 inside the sleeve 29 abuts against the outer wall of the first body 33. Continue to press the filter sleeve 23 inward. The frustum end of the first body 33 slides under the guidance of the inclined wall of the locking block 37. The locking block 37 retracts along the telescopic groove 35 under the compression of the first body 33. The second body 39 continues to compress, moving the locking blocks 37 on both sides away. The compression spring 36 is compressed under the compression force, and the telescopic rod 34 extends under the pushing force. The first body 33 moves past the locking blocks 37 on both sides and continues to move towards the inner end of 29. The stepped surface of the first body 33 and the end face of the locking block form a locking limit. At the same time, the return spring 19 pushes the locking block 37 and 39 to abut under the elastic force, completing the installation of the filter sleeve 23.

[0042] The working principle of this invention is as follows: Concentrated sulfuric acid and diluted pure water are respectively introduced into the two sets of injection pipes 13 at the top of the mixing hopper 5. The fluid is atomized by the spray head 14 and sprayed into the upper pre-mixing chamber to complete low-speed pre-mixing. The pre-mixed solution flows down into the lower further mixing chamber at a limited speed through the circumferentially distributed inclined guide holes 20 of the guide baffle 15. The pre-mixed sulfuric acid solution is stirred by the stirring blades 17 to eliminate the stratification of solution concentration and achieve uniform dilution. The drain valve 7 is opened to send the diluted sulfuric acid solution into the shell-and-tube heat exchanger 4 for heat exchange and cooling. After cooling, it is temporarily stored in the transfer tank 3. The power pump 2 on the bottom plate 1 draws dilute sulfuric acid from the transfer tank 3 and delivers it to the input pipe through the output end. Inside the first filter tube 10 and the first filter tube 11, when the dilute sulfuric acid flows through the fixed plate 25, it impacts the impeller 24 at the front end of the shaft 26. The fluid kinetic energy drives the impeller 24 and the shaft 26 to rotate synchronously. The brush plate 27 at the other end of the shaft 26 rotates accordingly. The bristles on the surface of the brush plate 27 continuously adhere to and scrape the front surface of the primary filter screen 28, and the bristles are arranged along the fluid flow gap, without obstructing the main flow area and avoiding reducing the fluid flow rate. The filter sleeve 23 performs coarse to fine stratification of the dilute sulfuric acid, intercepting large particles, fine suspended matter, and colloidal particles, achieving gradient multi-stage impurity removal. The high-purity dilute sulfuric acid after three-stage filtration and purification is sent to the storage tank 9 for sealed storage through the second filter tube 12. (Disassembly and assembly of filter sleeve 23) This operation must be performed after the equipment is shut down and the pipeline is completely depressurized. Disassembly is prohibited under pressurized filtration conditions. Press the filter sleeve 23 from the flange 21 end. The filter sleeve 23 will simultaneously drive the sleeve 29 to move. The locking block 37 will push the second body 39 to slide along the outer wall of the slide rod 38 until the second body 39 abuts against the top column 40. At this time, the locking blocks 37 on both sides will move towards the telescopic groove 35 inside the second body 39 under the pressure of the second body 39. The compression spring 36 will be compressed, and the telescopic rod 34 will extend under the pushing force. The locking blocks 37 will abut against the second body 39. The two locking blocks 37 will clamp the second body 39 and pull the filter sleeve 23 in the opposite direction. When the side wall of the first body 33 is pushed open 37, continue to pull the filter sleeve 23. The locking blocks 37 will pass the abutment end of the first body 33 and the second body 39, and the filter sleeve 23 will be completed. Disassembly and installation process of filter sleeve 23: Insert filter sleeve 23 along the inner wall of second filter tube 12. The inclined wall of the locking block 37 in sleeve 29 abuts against the outer wall of first body 33. Continue to press filter sleeve 23 inward. The frustum end of first body 33 slides under the guidance of the inclined wall of locking block 37. Locking block 37 retracts along telescopic groove 35 under the compression of first body 33. Second body 39 continues to compress and move the locking blocks 37 on both sides away. Compression spring 36 is compressed under the compression force. Telescopic rod 34 extends under the pushing force. First body 33 moves past the locking blocks 37 on both sides and continues to move towards the inner end of 29. The stepped surface of first body 33 and the end face of locking block form a locking limit. At the same time, the return spring 19 pushes locking block 37 and 39 to abut under the elastic force, completing the installation of filter sleeve 23.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modular multi-stage filtration and impurity removal device for sulfuric acid dilution, comprising a base plate (1), characterized in that: The base plate (1) is provided with a dilution component and a quick-release component. The dilution component is used for the safe dilution of sulfuric acid, and the quick-release component can realize the quick assembly and disassembly of the filter component. The quick-release assembly includes a second filter tube (12) and a sleeve (29). A filter sleeve (23) is embedded in the second filter tube (12). Multiple support plates (30) are evenly fixed along the circumference of the inner wall of the second filter tube (12). A top column (40) is fixedly connected to one end of the support plate (30) near the filter sleeve (23). The sleeve (29) is fixedly connected to the filter sleeve (23). Two telescopic grooves (35) are symmetrically opened on the inner wall of the sleeve (29). 35) An internal sliding connection is provided with a telescopic rod (34). The inner end of the telescopic rod (34) extends from the outside of the sleeve (29) through the cylinder wall into the telescopic groove (35). A sliding rod (38) is fixedly connected to the end of the top column (40) near the sleeve (29). A first platform (33) is fixedly connected to the end of the sliding rod (38) away from the top column (40). A locking block (37) is fixedly connected to the end of each telescopic rod (34) near the first platform (33), and the locking block (37) is engaged with the first platform (33). The dilution assembly includes a mixing hopper (5), with two injection pipes (13) symmetrically installed on the upper end of the mixing hopper (5). One end of the injection pipe (13) located inside the mixing hopper (5) is fixedly connected to a spray head (14). A flow guide baffle (15) is fixedly connected inside the mixing hopper (5). The flow guide baffle (15) is located below the spray head (14), and the flow guide baffle (15) has multiple flow guide holes (20) evenly opened along the circumference.

2. The modular sulfuric acid dilution multi-stage filtration and impurity removal device according to claim 1, characterized in that: The mixing hopper (5) is rotatably connected to a rotating shaft (16), which is rotatably connected to a flow guide baffle (15). A stirring blade (17) is fixedly connected to the outer wall of the rotating shaft (16), and the stirring blade (17) is located below the flow guide baffle (15).

3. The modular sulfuric acid dilution multi-stage filtration and impurity removal device according to claim 2, characterized in that: The discharge end of the mixing hopper (5) is fixedly connected to a discharge valve (7), and the end of the rotating shaft (16) near the discharge valve (7) is fixedly connected to a stirring rack (18).

4. The modular sulfuric acid dilution multi-stage filtration and impurity removal device according to claim 1, characterized in that: The first filter tube (11) is fixedly connected to the upper surface of the base plate (1), and the first filter tube (11) is suspended above the base plate (1). The primary filter screen (28), the medium-efficiency filter plate (31), and the precision filter plate (32) are embedded in the filter sleeve (23) at intervals. The connection between the first filter tube (11) and the second filter tube (12) is fixedly connected to a flange (21), and multiple bolts (22) are evenly installed on the flange (21) along the circumference.

5. A modular sulfuric acid dilution multi-stage filtration and impurity removal device according to claim 4, characterized in that: A fixing plate (25) is welded and fixed to the inner wall of the first filter tube (11), and a shaft (26) is rotatably connected at the center of the fixing plate (25).

6. A modular sulfuric acid dilution multi-stage filtration and impurity removal device according to claim 5, characterized in that: One end of the shaft (26) is fixedly connected to an impeller (24), and the other end of the shaft (26) is fixedly connected to a brush plate (27). The bristles of the brush plate (27) abut against the primary filter screen (28), and the bristles are arranged along the fluid flow gap.

7. The modular sulfuric acid dilution multi-stage filtration and impurity removal device according to claim 1, characterized in that: The outer wall of the slide rod (38) is slidably connected to a second body (39), and the outer wall of the top column (40) is fitted with a return spring (19), which abuts against the sleeve (29).

8. The modular sulfuric acid dilution multi-stage filtration and impurity removal device according to claim 1, characterized in that: The telescopic rod (34) is fitted with a compression spring (36) on its outer wall. The two ends of the compression spring (36) abut against the locking block (37) and the telescopic groove (35) respectively.

9. A modular sulfuric acid dilution multi-stage filtration and impurity removal device according to claim 3, characterized in that: The upper surface of the base plate (1) is fixedly connected to a support frame (8), a shell-and-tube heat exchanger (4), and a transfer tank (3). The support frame (8) is fixedly connected to the mixing hopper (5). One end of the shell-and-tube heat exchanger (4) is connected to the mixing hopper (5) through a pipe, and the other end is connected to the transfer tank (3) through a pipe. A sulfuric acid concentration meter (6) is inserted through the side wall of the mixing hopper (5), and the detection probe of the sulfuric acid concentration meter (6) extends into the inner cavity of the mixing hopper (5) for real-time detection of sulfuric acid concentration.

10. A modular multi-stage filtration and impurity removal device for sulfuric acid dilution according to claim 9, characterized in that: A power pump (2) and a storage tank (9) are fixedly connected to the upper surface of the base plate (1). The input end of the power pump (2) is connected to the transfer tank (3). The output end of the power pump (2) is fixedly connected to an input pipe (10). The input pipe (10) is connected to the first filter pipe (11), and the second filter pipe (12) is connected to the storage tank (9).

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