Circulation front end treatment device based on electroplating wastewater

Abstract

The application discloses a circulating front-end treatment device based on electroplating wastewater, which comprises a filter residue tank, a stainless steel filter cover is fixed on the inner wall of the filter residue tank through bolts, a medicine storage cylinder is fixed on the top of the stainless steel filter cover in the filter residue tank through a support, and a sealing sleeve is slidably connected to the medicine storage cylinder; the application takes the rotating speed gear of a transmission assembly as the control basis, takes the electroplating wastewater in the liquid inlet as the detection object, controls the rotation of the rotating shaft according to the acid-base value of the electroplating wastewater, the rotating shaft one drives the rotating shaft two and the elastic scraper to rotate at low speed, the large-particle impurities intercepted on the inner wall of the stainless steel filter cover are scraped and removed in circulation, the precipitation of heavy metal ions in the electroplating wastewater is accelerated at the same time, the rotating speed of the rotating shaft one is improved to drive the rotating arm on the rotating shaft two to rotate, the groove sleeve side friction disc is separated from the friction sleeve on the rotating shaft one under the pulling of the connecting rod, the sealing sleeve at the bottom of the medicine storage cylinder is opened, and the medicine is automatically added.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electroplating wastewater front-end treatment, in particular to a circulating front-end treatment device based on electroplating wastewater. BACKGROUND

[0002] Electroplating wastewater refers to wastewater containing heavy metals, acids, alkalis, organic matter and other pollutants generated in the electroplating production process, which has the characteristics of high toxicity, complex composition and high treatment difficulty, and the treatment methods are usually divided into chemical precipitation method, ion exchange method, membrane separation technology, electrolysis method and biological treatment method, etc.

[0003] The patent with publication number CN222476213U relates to a chemical precipitation method, which drives the piston to move up through the air cylinder, the piston moves up to reduce the air pressure in the inside of the fixed cylinder, the reagent enters the fixed cylinder through the suction tube, then the piston is driven to move down by the air cylinder, the reagent is discharged from the second one-way valve, and the air cylinder reciprocates to achieve the purpose of quantitative dosing and ensure the accuracy of dosing. The entire dosing mechanism is isolated and removed through the medicine suction tube. However, there is a lack of management of separately stored reagents, and during the removal process, the problem of uneven composition caused by long-term storage of reagents may occur, resulting in large differences in subsequent reaction effects. In addition, during the initial treatment of electroplating wastewater, no large-particle impurity interception treatment is performed, which increases the impurity content of the electroplating wastewater after chemical treatment. Therefore, we propose a circulating front-end treatment device based on electroplating wastewater. SUMMARY

[0004] The purpose of the present application is to provide a circulating front-end treatment device based on electroplating wastewater to solve the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a circulating front-end treatment device based on electroplating wastewater, comprising a filter residue tank, a stainless steel filter cover is fixed on the inner wall of the filter residue tank through bolts, a medicine storage cylinder is fixed on the top of the stainless steel filter cover in the filter residue tank through a support, a sealing sleeve is slidably connected to the top of the medicine storage cylinder, a liquid discharge groove is symmetrically formed on the outer wall of the sealing sleeve, a second rotating shaft is installed in the sealing sleeve in the filter residue tank, and the sealing sleeve and the second rotating shaft are slidably connected, and elastic scrapers are symmetrically installed on the outer wall of the second rotating shaft in the stainless steel filter cover.

[0006] A rotating arm is rotationally connected to the outer wall of the second rotating shaft and the center of the filter residue tank, a counterweight ball is fixed on the end of the rotating arm through welding, the end of the rotating arm is movably connected to the outer wall of the sealing sleeve on both sides through a rotating connecting rod, and a conical sleeve is slidably connected to the top of the rotating arm.

[0007] Furthermore, a transmission assembly is bolted to the top of the filter cake tank, and a rotating shaft is fixedly connected to the output end of the transmission assembly. The end of the rotating shaft passes through the top of the filter cake tank and is fixed with a friction cover by welding.

[0008] Furthermore, a grooved sleeve is slidably connected to the second rotating shaft, and the grooved sleeve is slidably connected to the second rotating shaft. A friction disc is fixed at the top of the grooved sleeve, and the friction disc abuts against the friction cover. A spring is installed on the outer wall of the second rotating shaft, and one side of the spring abuts against the bottom of the grooved sleeve.

[0009] Furthermore, the top inner wall of the filter cake tank is symmetrically and rotatably connected with a folding rod, one end of which abuts against the groove opening on the sleeve, and the other end of which abuts against the outer wall of the conical sleeve.

[0010] Furthermore, the top of the filter residue tank is provided with a dosing port, and the bottom of the dosing port is connected to the storage cylinder via a connecting pipe.

[0011] Furthermore, the outer wall of the filter cake tank is provided with a liquid inlet, and the bottom of the liquid inlet is flush with the stainless steel filter cover. The outer wall of the filter cake tank is provided with a liquid outlet.

[0012] Furthermore, a slag discharge pipe is fixedly connected to the bottom of the filter cake tank, a ball valve is installed on the filter cake tank, and a control box is fixedly connected to the outer wall of the filter cake tank via a bracket.

[0013] The front-end treatment method for the electroplating wastewater is as follows:

[0014] Physical pretreatment: Electroplating wastewater discharged from the inlet side enters the inside of the stainless steel filter cover. After being intercepted and filtered by the stainless steel filter cover, metal shavings ≥5mm adhere to the inner wall of the stainless steel filter cover. The rotating shaft driven by the transmission component rotates, and the friction cover on the rotating shaft drives the friction disc to rotate, thereby realizing the rotation of the elastic scraper on the outer wall of the rotating shaft to remove the adhered metal shavings. The accumulated metal shavings are located at the bottom of the filter residue tank and are automatically discharged through the opening of the ball valve.

[0015] Chemical reagent addition: The pH sensor installed on the inlet side automatically detects the acidity and alkalinity of the electroplating wastewater. When the pH value of the electroplating wastewater is detected to be greater than 9 or less than 7, the control box automatically increases the speed of the first rotating shaft. As the first rotating shaft rotates, the counterweight ball at the end of the rotating arm on the second rotating shaft rotates, stirring and mixing the reagent in the storage cylinder. With the increase in speed, the rotating arm rotates to a higher height, causing the sealing sleeve connected to the connecting rod to slide on the surface of the second rotating shaft, thus connecting the drain tank and the storage cylinder. The reagent automatically enters the electroplating wastewater, completing the automatic addition of the reagent.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] In this invention, the speed range of the transmission component is used as the control basis, and the electroplating wastewater at the inlet is used as the detection object. The rotation of the shaft is controlled according to the pH value of the electroplating wastewater. When rotating at low speed, the first shaft drives the second shaft and the elastic scraper to rotate, which circulates and scrapes away large particles of impurities intercepted on the inner wall of the stainless steel filter cover. With the opening of the ball valve on the slag discharge pipe, the removal of metal debris is automatically completed, and the precipitation of heavy metal ions in the electroplating wastewater is accelerated. When the speed of the first shaft increases, it drives the rotating arm on the second shaft to rotate. Under the pull of the connecting rod, the friction disc on the tank side is disengaged from the friction sleeve on the first shaft. At the same time, the sealing sleeve at the bottom of the storage cylinder is opened, and the chemical is automatically added. When there is no power input, the speed of the second shaft decreases, which leads to the end of the chemical discharge. Then, after the friction disc and the friction sleeve re-contact, a new round of speed increase and feeding begins. The interval quantitative chemical feeding realizes the automatic adjustment of the pH value of the electroplating wastewater. While discharging the chemical, the rotating arm can also stir the chemical, which can improve the subsequent reaction rate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the electroplating wastewater recycling front-end treatment device of the present invention;

[0019] Figure 2 This is a schematic cross-sectional view of the front-end treatment device for electroplating wastewater circulation according to the present invention.

[0020] Figure 3 This is a schematic diagram of the installation structure of the elastic scraper on the second rotating shaft of the present invention;

[0021] Figure 4 This is a schematic diagram of the contact structure between the friction cover on the rotating shaft and the friction disk on the groove sleeve of the present invention;

[0022] Figure 5 This is a schematic diagram of the connection between the rotating arm of the present invention and the conical sleeve and the sealing sleeve via a connecting rod;

[0023] Figure 6 This is a schematic diagram of the state of the rotating arm when the rotating shaft of the present invention rotates at low speed.

[0024] Figure 7 This is a schematic diagram of the state of the rotating arm when the rotating shaft of the present invention rotates at high speed.

[0025] In the diagram: 1. Filter residue tank; 2. Transmission assembly; 3. Shaft 1; 4. Control box; 5. Liquid inlet; 6. Liquid outlet; 7. Sludge discharge pipe; 8. Ball valve; 9. Dosing port; 10. Stainless steel filter cover; 11. Shaft 2; 12. Elastic scraper; 13. Chemical storage cylinder; 14. Friction cover; 15. Tank sleeve; 16. Friction disc; 17. Rotating arm; 18. Sealing sleeve; 19. Drainage trough; 20. Conical sleeve; 21. Bending rod; 22. Spring. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1-7 The present invention provides a technical solution:

[0028] Example 1: Electroplating wastewater has a complex composition, containing heavy metals, acids, alkalis, and organic matter. It requires efficient pretreatment to achieve recycling. The screens and filters installed in the early stage are used to remove large particulate solid impurities in the wastewater. The subsequent adjustment of the pH of the wastewater promotes metal precipitation. The core of adjusting the pH value to promote metal precipitation lies in the difference in solubility of metal hydroxides. By controlling the pH of the solution, heavy metal ions are converted into water-insoluble hydroxide precipitates, thus promoting metal precipitation. Metal ions such as Cu²⁺, Ni²⁺, and Cr³⁺ will combine with hydroxide ions in water to form hydroxide precipitates.

[0029] like Figure 1 As shown, the circulating front-end treatment device for electroplating wastewater uses a traditional wastewater filter tank 1 as the main body and employs a relatively existing stainless steel filter cover 10 to intercept impurities. For this purpose, an inlet 5 and an outlet 6 are provided on the outer wall of the filter tank 1. Figure 2 As shown, the inlet 5 is flush with the stainless steel filter cover 10. The electroplating wastewater discharged into the stainless steel filter cover 10 comes to the inside of the stainless steel filter cover 10. After being filtered by the stainless steel filter cover 10, large metal debris adheres to the inner wall of the stainless steel filter cover 10. The filtered electroplating wastewater is discharged through the outlet 6 for further deep treatment.

[0030] As the interception time increases, the amount of debris on the inner wall of the stainless steel filter cover 10 increases, affecting the liquid flow rate, necessitating debris cleaning. Figure 2 As shown, a rotating shaft 11 is installed inside the stainless steel filter cover 10. An elastic scraper 12 is connected and fixed on the rotating shaft 11. As the rotating shaft 11 rotates, the elastic scraper 12 drives the inner wall of the stainless steel filter cover 10 to clean the debris. At the same time, the ball valve 8 on the bottom slag discharge pipe 7 is opened to automatically discharge a small amount of wastewater with high impurity content. After the centralized filter residue treatment, the electroplating solution is sent back into the filter residue tank 1 for further treatment.

[0031] For the rotation of shaft 11, as Figure 3 and Figure 4As shown, the end of the second rotating shaft 11 is installed inside the sleeve 15, which facilitates the rotation of the second rotating shaft 11. A friction disc 16 is installed on the top of the sleeve 15, and a transmission assembly 2 is installed on the top of the filter tank 1. The motor output end of the transmission assembly 2 is connected to the first rotating shaft 3, which is driven by the motor to rotate. The first rotating shaft 3 is not in direct contact with the second rotating shaft 11. A friction cover 14 is fixedly connected to the end of the first rotating shaft 3. The rotation of the second rotating shaft 11 is achieved by the friction disc 16 on the second rotating shaft 11 abutting against the friction cover 14. For this purpose, a spring 22 is installed on the outer wall of the second rotating shaft 11. The spring 22 applies an upward elastic force to abut against the sleeve 15. The rotation of the second rotating shaft 11 is accompanied by the continuous discharge of electroplating wastewater for recycling.

[0032] Example 2: Due to the excessive heavy metal ion content in the electroplating wastewater, a dosing component was installed in the entire filter tank 1 to further pre-treat the wastewater. This component was used to adjust the pH value of the electroplating wastewater during the initial filtration. Therefore, a storage cylinder 13 was installed in the filter tank 1.

[0033] like Figure 5 As shown, the storage cylinder 13 is fixed to the inner wall of the filter residue tank 1, and the second rotating shaft 11 passes through it directly. The second rotating shaft 11 is fitted with a slidable sealing sleeve 18 at the position where it passes through the storage cylinder 13. The dosing port 9 located at the top of the filter residue tank 1 is responsible for sending the prepared medicine into the storage cylinder 13. Along with the installation of the sealing sleeve 18, it is used to plug the discharge hole. The rotation of the second rotating shaft 11 drives the sealing sleeve 18 to rotate. The outer wall of the second rotating shaft 11 is also rotatably connected to the rotating arm 17. The end of the rotating arm 17 is provided with a counterweight ball. The connecting rod on the rotating arm 17 is connected to the sealing sleeve 18. The other end of the rotating arm 17 is connected to the conical sleeve 20 fitted on the second rotating shaft 11 through the connecting rod.

[0034] When cleaning the inner wall of the stainless steel filter cover 10 in Example 1, the low-speed rotating shaft 3 drives the rotating shaft 11 to rotate synchronously. At this time, the rotating arm 17 located on the rotating shaft 11 cannot rotate to open or close due to the low speed. At this time, only the elastic scraper 12 performs the accompanying cleaning function.

[0035] When the online pH sensor at the inlet 5 of the filter tank 1 detects an abnormal pH level in the electroplating wastewater, the abnormal value can be pre-entered into the control box 4. The abnormal value for electroplating wastewater is determined based on the optimal precipitation pH range for different metals. Typically, an abnormal value is a pH greater than 9 or less than 7. Most heavy metals precipitate best within the pH range of 7-9, which is why this range is commonly chosen in electroplating wastewater treatment. Therefore, when an abnormal pH level is detected, chemical adjustments are proactively made. The chemicals are usually sulfuric acid or sodium hydroxide. For electroplating wastewater containing chromium, sodium metabisulfite is also added to remove chromium. 6⁺ is reduced to Cr³⁺, and the ORP is controlled between -200mV and -300mV. The dosing operation is usually carried out in stages, first adjusting the pH, and then adding other reagents.

[0036] During the automatic addition of reagents, the control box 4 located on the outer wall of the filter cake tank 1 adjusts the speed of the entire rotating shaft 3. After the speed of rotating shaft 3 is increased, the rotating arm 17 located on rotating shaft 2 11 begins to unfold inside the storage cylinder 13 as it rotates. Figure 7 As shown, the connecting rod on the rotating arm 17 starts to pull the sealing sleeve 18 on the rotating shaft 11 upward. A drain groove 19 is also provided on the outer wall of the sealing sleeve 18. The rising sealing sleeve 18 causes the drain groove 19 to connect with the medicine storage cylinder 13. The medicine flows into the stainless steel filter cover 10 along the drain groove 19, completing the automatic addition of medicine.

[0037] Since the rotational speed of shaft 13 is the core of the entire dosing adjustment, the automatic dosing operation is achieved by avoiding frequent adjustments of the rotational speed of shaft 13 by transmission component 2. Figure 5 and Figure 6 As shown, the connecting rod at the end of the rotating arm 17 is also movably connected to a conical sleeve 20, and a folding rod 21 is symmetrically rotatably connected to the inner wall of the top of the filter tank 1. As the rotating shaft 3 rotates at high speed, the rotating arm 17 rotates and floats while pulling the entire conical sleeve 20 downward, causing the folding rod 21 on one side to contact the upper inclined surface of the conical sleeve 20, causing the folding rod 21 to rotate to the bottom. Meanwhile, the groove sleeve 15 located at the other end of the folding rod 21 is pressed and moves downward synchronously, causing the friction disc 16 to disengage from the friction cover 14. At this time, the transmission component 2 normally drives the rotating shaft 3 to rotate at high speed, while the rotating shaft 11, which has no transmission energy input, begins to reduce its speed. At the same time, the suspension height of the rotating arm 17 on the rotating shaft 11 decreases synchronously until the conical sleeve 20 resets. With the help of the spring 22, the groove sleeve 15 is pushed upward, and the friction disc 16 re-contacts the friction cover 14, driving the rotating shaft 11 to rotate at high speed again.

[0038] The low-speed rotation of the second shaft 11 causes the sealing sleeve 18 to seal the storage cylinder 13. Therefore, the cyclical speed change of the second shaft 11 realizes the intermittent drug feeding operation of the entire filter tank 1. At the same time, the rotation of the rotating arm 17 in the storage cylinder 13 can also realize the stirring and mixing of the agent, avoiding the precipitation problem of the agent stored for a long time. By adjusting the gear of the transmission component 2, the agent in the storage cylinder 13 can be automatically added. The intermittent quantitative drug feeding realizes the automatic adjustment of the pH of electroplating wastewater. While discharging the drug, the rotation of the rotating arm 17 can also stir the agent and improve the subsequent reaction rate.

[0039] The working principle of this invention is as follows:

[0040] Electroplating wastewater discharged from the inlet 5 enters the inner side of the stainless steel filter cover 10. After being intercepted and filtered by the stainless steel filter cover 10, metal shavings ≥5mm adhere to the inner wall of the stainless steel filter cover 10. The rotating shaft 3 driven by the transmission component 2 rotates, and the friction cover 14 on the rotating shaft 3 drives the friction disc 16 to rotate, thereby rotating the elastic scraper 12 on the outer wall of the rotating shaft 11 to remove the adhered metal shavings. The accumulated metal shavings are located at the bottom of the filter residue tank 1 and are automatically discharged through the opening of the ball valve 8.

[0041] The pH sensor installed on the side of the inlet 5 automatically detects the acidity and alkalinity of the electroplating wastewater. When the pH value of the electroplating wastewater is detected to be greater than 9 or less than 7, the control box 4 automatically increases the speed of the rotating shaft 3. As the rotating shaft 3 rotates, the counterweight ball at the end of the rotating arm 17 on the rotating shaft 2 11 rotates, stirring and mixing the reagent in the storage cylinder 13. With the increase in speed, the rotating height of the rotating arm 17 increases, causing the sealing sleeve 18 connected to the connecting rod to slide on the surface of the rotating shaft 2 11, so that the drain tank 19 is connected to the storage cylinder 13, and the reagent automatically enters the electroplating wastewater, completing the automatic addition of reagent.

[0042] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A circulating front-end treatment device for electroplating wastewater, comprising a filter residue tank (1), characterized in that, The inner wall of the filter cake tank (1) is fixed with a stainless steel filter cover (10) by bolts. The filter cake tank (1) is fixed with a medicine storage cylinder (13) by a bracket inside the filter cake tank (1) and on top of the stainless steel filter cover (10). A sealing sleeve (18) is slidably connected to the medicine storage cylinder (13). Drainage grooves (19) are symmetrically opened on the outer wall of the sealing sleeve (18). A rotating shaft (11) is installed inside the filter cake tank (1) and on the sealing sleeve (18). The sealing sleeve (18) is slidably connected to the rotating shaft (11). Elastic scrapers (12) are symmetrically installed on the outer wall of the rotating shaft (11) and inside the stainless steel filter cover. The outer wall of the rotating shaft (11) and the center of the filter tank (1) are symmetrically connected to a rotating arm (17). The end of the rotating arm (17) is fixed by welding a counterweight ball. The end of the rotating connecting rod on the rotating arm (17) is movably connected to the outer walls of the sealing sleeve (18) on both sides. The outer wall of the rotating shaft (11) and the top of the rotating arm (17) are fitted with a tapered sleeve (20) that is slidably connected. The connecting rod at the end of the rotating arm (17) is movably connected to the outer wall of the tapered sleeve (20). The top of the filter tank (1) is fixed with a transmission assembly (2) by bolts. The output end of the transmission assembly (2) is fixedly connected with a rotating shaft (3). The end of the rotating shaft (3) passes through the top of the filter tank (1) and is fixed with a friction cover (14) by welding. A grooved sleeve (15) is slidably connected to the second rotating shaft (11), and the grooved sleeve (15) is slidably connected to the second rotating shaft (11). A friction disk (16) is fixed at the top of the grooved sleeve (15), and the friction disk (16) abuts against the friction cover (14). A spring (22) is installed on the outer wall of the second rotating shaft (11), and one side of the spring (22) abuts against the bottom of the grooved sleeve (15). The filter tank (1) is symmetrically rotatably connected to the inner wall of the top. One end of the folding rod (21) abuts against the groove on the sleeve (15), and the other end of the folding rod (21) abuts against the outer wall of the conical sleeve (20).

2. The circulating front-end treatment device for electroplating wastewater according to claim 1, characterized in that, The top of the filter residue tank (1) is provided with a dosing port (9), and the bottom of the dosing port (9) is connected to the storage cylinder (13) through a connecting pipe.

3. The circulating front-end treatment device for electroplating wastewater according to claim 2, characterized in that, The outer wall of the filter cake tank (1) is provided with a liquid inlet (5), and the bottom of the liquid inlet (5) is flush with the stainless steel filter cover (10). The outer wall of the filter cake tank (1) is provided with a liquid outlet (6).

4. The circulating front-end treatment device for electroplating wastewater according to claim 3, characterized in that, The bottom of the filter tank (1) is connected to a slag discharge pipe (7), a ball valve (8) is installed on the filter tank (1), and a control box (4) is fixedly connected to the outer wall of the filter tank (1) by a bracket.

5. The circulating front-end treatment device for electroplating wastewater according to claim 4, characterized in that, The front-end treatment method for the electroplating wastewater is as follows: Physical pretreatment: Electroplating wastewater discharged from the inlet (5) enters the inside of the stainless steel filter cover (10). After being intercepted and filtered by the stainless steel filter cover (10), metal chips ≥5mm adhere to the inner wall of the stainless steel filter cover (10). The rotating shaft (3) driven by the transmission component (2) rotates, and the friction cover (14) on the rotating shaft (3) drives the friction disc (16) to rotate, thereby realizing the rotation of the elastic scraper (12) on the outer wall of the rotating shaft (11) to remove the adhered metal chips. The accumulated metal chips are located at the bottom of the filter residue tank (1) and are automatically discharged through the opening of the ball valve (8). Chemical agent addition: The pH sensor installed on the side of the liquid inlet (5) automatically detects the acidity and alkalinity of the electroplating wastewater. When the pH value of the electroplating wastewater is detected to be greater than 9 or less than 7, the control box (4) automatically increases the rotation speed of the first rotating shaft (3). While the first rotating shaft (3) rotates, the counterweight ball at the end of the rotating arm (17) on the second rotating shaft (11) rotates, and the agent in the storage cylinder (13) is stirred and mixed. As the rotation speed increases, the rotation height of the rotating arm (17) increases, causing the sealing sleeve (18) connected to the connecting rod to slide on the surface of the second rotating shaft (11), so that the drain tank (19) is connected to the storage cylinder (13), and the agent automatically enters the electroplating wastewater, completing the automatic addition of the agent.

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