A device for recycling waste acid from hot galvanizing and a method for recycling waste acid from hot galvanizing

Abstract

The application discloses a hot galvanizing waste acid resource treatment device and a treatment method thereof. The device comprises a treatment tank, a treatment box is installed outside the treatment tank, a driving box is installed at the rear side of the treatment tank and the treatment box, and a linkage waste liquid treatment mechanism is arranged in the treatment tank, the treatment box and the driving box to realize the separation operation of acid and metal salt and the cleaning of a separation membrane. The application relates to the technical field of waste resource treatment. The hot galvanizing waste acid resource treatment device and the treatment method thereof realize the recovery of hydrochloric acid in hot galvanizing waste acid through membrane separation technology, the separation membrane after use enters the treatment box through the driving of a moving part, and the separation membrane is flushed through an online backwashing part, so that the separation membrane is regenerated through online reverse flushing, rapid switching and multiplexing, the service life of the membrane is significantly prolonged, the cost of consumables is reduced, the continuous and uninterrupted resource treatment of hot galvanizing waste acid is realized, and the treatment efficiency and equipment utilization are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of waste resource treatment technology, specifically to a device and method for the resource recovery treatment of hot-dip galvanizing waste acid. Background Technology

[0002] In the hot-dip galvanizing process in the steel industry, hydrochloric acid is usually used for pickling to remove iron oxide scale from the surface of steel. This generates a large amount of waste acid from hot-dip galvanizing. This waste acid contains a variety of metal ions and is characterized by strong acidity, high salt content, and high corrosiveness. Direct discharge of this waste acid will cause serious environmental pollution.

[0003] The reference patent title is: A Resource Utilization Device for Hot-Dip Galvanizing Waste Acid (Patent Publication No.: CN206447716U, Patent Publication Date: 2017-08-29), which includes a first neutralization reaction tank, a sludge conditioning tank, a first plate and frame filter press, a second neutralization reaction tank, a sedimentation tank, a sludge tank, a second plate and frame filter press, a pH adjustment tank, a solar preheating tank, an MVR evaporation system, and a condensation recovery tank. It achieves the separation of iron and heavy metals and the efficient recovery of iron, while the heavy metal hazardous waste meets the requirements for volume reduction treatment; it reduces the operating cost of the entire system and the workload of subsequent treatment units; and it achieves zero-discharge treatment of waste acid.

[0004] Based on the description in the above documents, in the existing hot-dip galvanizing waste acid resource recovery treatment, it is rapidly adsorbed and deposited on the membrane surface and inside the membrane pores during the membrane separation process, resulting in a sharp drop in membrane flux and a decrease in separation efficiency, and failing to achieve timely cleaning or replacement of the membrane. Therefore, the present invention provides a hot-dip galvanizing waste acid resource recovery treatment device and treatment method. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a device and method for the resource recovery treatment of hot-dip galvanized waste acid, which solves the problems of easy contamination and blockage of the separation membrane by metal salts, rapid decline in throughput, and inability to clean online during the resource recovery treatment of hot-dip galvanized waste acid.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hot-dip galvanizing waste acid resource utilization treatment device, comprising a treatment tank, with a treatment box installed outside the treatment tank, and a drive box installed at the rear of the treatment tank and the treatment box. A linked waste liquid treatment mechanism is installed inside the treatment tank, the treatment box, and the drive box to achieve the separation of acid and metal salt, and simultaneously clean the separation membrane. The waste liquid treatment mechanism includes: The membrane separation unit enables the separation of acids and metal salts; The moving part includes a cover frame, the bottom of which is provided with a positioning part for clamping the separation membrane, and an L-shaped frame is installed on the top side of the cover frame. The L-shaped frame is driven by a drive unit provided in the drive box to enable the positioning part to move horizontally to the left and right. The backwashing unit, located inside the treatment tank and below the separation membrane, performs the backwashing operation. It includes a flushing tank installed on the outer edge of the treatment tank, and a transmission pipe connected to the flushing tank via a hydraulic pump transmits the flushing water to the nozzle installed on the transmission pipe.

[0007] Preferably, the membrane separation unit includes: Both the waste acid chamber and the dilute acid chamber are fixedly installed inside the treatment tank, with the waste acid chamber located above the dilute acid chamber. The waste acid chamber is introduced into the hot-dip galvanizing waste acid solution through the inlet pipe, while the dilute acid chamber is connected to the rinsing tank through the connecting pipe. A separation membrane, which is an anion exchange membrane, is installed between the waste acid chamber and the dilute acid chamber to separate them.

[0008] Preferably, a recovery tank is installed at the bottom of the treatment tank, and the acid is transferred to the recovery tank through a pipe at the bottom of the treatment tank. A sealing element is provided at the gap between the treatment tank and the waste acid chamber and the dilute acid chamber through the membrane to achieve liquid isolation.

[0009] Preferably, the seal includes: The sealing plate is symmetrically arranged in the vertical direction and located on the outside of the gap in the treatment tank. A sealing gasket is installed on the sealing plate facing the gap in the treatment tank. The movable block is fixedly installed on the front and rear sides of the sealing plate, and the inner walls of the front and rear sides of the processing box are provided with movable grooves. The movable block is located inside the movable groove and is adapted to slide. A stop spring is installed between the opposite sides of the movable block and the movable groove. The elastic force of the stop spring, which is not affected by other external forces, makes the opposite sides of the sealing plate contact.

[0010] Preferably, the positioning part includes: The concave frame moves left and right inside the processing box via a sliding component, and a lower clamping plate is fixedly installed below the concave frame. The upper clamping plate is located between the concave frame and the lower clamping plate, and the upper clamping plate is connected to the concave frame by an elastic element. A support plate is fixedly installed on the lower clamping plate, and an abutment is provided on the support plate to make contact with the top surface of the upper clamping plate, so as to complete the movement of the upper clamping plate to the lower clamping plate to clamp the edge of the separation membrane.

[0011] Preferably, the sliding component includes a rotating shaft rotatably mounted on the concave frame, and a sliding wheel is installed on the end face of the rotating shaft. Sliding grooves are provided on the front and rear inner walls of the processing box, and the sliding wheel is located in the sliding groove to adapt to movement without disengaging.

[0012] Preferably, the elastic element includes: The sleeve is fixedly installed on the top of the upper clamping plate; A through rod is fixedly installed on the top of the lower clamping plate, and the through rod passes through the upper clamping plate and extends into the inside of the sleeve. A limit plate is installed at the top of the through rod, and a return spring is installed between the limit plate and the opposite side of the upper clamping plate. The elastic force of the return spring, which is not affected by other external forces, causes the upper clamping plate to move away from the lower clamping plate. The abutment includes a central shaft, which is rotatably mounted on the side of the support plate. A half-cam is fixedly mounted on the surface of the central shaft. A handle is mounted on the top side of the edge of the half-cam. When the handle drives the half-cam to rotate, the distance from the contact point between the half-cam and the upper clamping plate to the rotation center of the half-cam increases, thereby enabling the upper clamping plate to move down and cooperate with the lower clamping plate to complete the clamping operation.

[0013] Preferably, the driving unit includes: The drive motor is fixedly installed on the inner wall of the drive box, and one end of the drive motor output shaft is fixedly installed with the drive shaft through a coupling. One end of the drive shaft is rotatably connected to the outer wall of the processing tank, and a transmission gear is fixedly installed on the surface of the drive shaft. A concave strip is fixedly installed at the bottom of the inner cavity of the drive box. A transmission rack is slidably provided in the groove of the concave strip, and the two ends of the transmission rack are connected and fixed to the end face of the L-shaped frame. The transmission rack meshes with the surface of the transmission gear for transmission.

[0014] Preferably, an extraction tank is installed below the treatment tank, and the extraction tank treats the cationic waste liquid in the treatment tank. An exchange tank and a concentration tank are installed inside the extraction tank, and an electrolytic cell is set around the extraction tank. The cationic waste liquid passes through the exchange tank and the concentration tank in sequence and flows into the electrolytic cell to electrolyze and form cathode zinc.

[0015] This invention also discloses a method for the resource utilization of waste acid from hot-dip galvanizing, specifically including the following steps: S1. Introduce the hot-dip galvanizing waste acid into the treatment tank and use the membrane separation unit to separate the acid from the metal salt. S2. After processing for a period of time, the moving part moves the used separation membrane to the processing tank, and the backwashing part performs a backwashing operation on the used separation membrane.

[0016] This invention provides a device and method for the resource recovery and treatment of waste acid from hot-dip galvanizing. Compared with the prior art, it has the following advantages: 1. The hot-dip galvanizing waste acid resource recovery device and its treatment method realize the recovery of hydrochloric acid in hot-dip galvanizing waste acid through membrane separation technology. The used separation membrane is driven by the moving part to enter the treatment tank, and the separation membrane is washed by the online backwashing part. The separation membrane is regenerated by online backwashing and can be quickly switched for reuse, which significantly extends the service life of the membrane, reduces the cost of consumables, realizes continuous and uninterrupted resource recovery of hot-dip galvanizing waste acid, and greatly improves the treatment efficiency and equipment utilization rate.

[0017] 2. The hot-dip galvanized waste acid resource recovery treatment device and its treatment method use abutment components to achieve the clamping of the membrane edge by the upper and lower clamping plates, realizing the coordination of membrane clamping and positioning with dynamic membrane sealing structure. This achieves integrated operation of stable clamping, smooth displacement and dynamic sealing of the separation membrane, effectively preventing membrane damage, leakage and cross-contamination, ensuring the purity of recovered hydrochloric acid and stable and safe operation of the equipment, significantly improving the overall durability of the equipment and reducing the failure rate.

[0018] 3. The hot-dip galvanizing waste acid resource utilization treatment device and its treatment method achieve high-purity recovery and recycling of hydrochloric acid in waste acid through efficient separation by anion exchange membrane, which greatly reduces the consumption of new acid and the production of hazardous waste sludge. Furthermore, the separation membrane can be reciprocated by the drive unit, thereby ensuring that while one part is being cleaned, the other part can be completely separated, effectively guaranteeing the resource utilization efficiency of hot-dip galvanizing waste acid. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the internal structure of the processing tank and processing box of the present invention; Figure 3 This is a three-dimensional structural diagram of the internal structure of the processing tank and drive box of the present invention; Figure 4 This is a three-dimensional sectional view of the processing box of the present invention; Figure 5 This is a three-dimensional structural diagram of the backwashing section of the present invention; Figure 6 This is a three-dimensional structural diagram of the moving part of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of the local structure at point A in the middle; Figure 8 This is a three-dimensional structural diagram of the positioning part of the present invention; Figure 9 This is a three-dimensional structural diagram of the abutment component of the present invention; Figure 10 This is a three-dimensional structural diagram of the elastic element of the present invention; Figure 11 This is a three-dimensional structural diagram of the driving unit of the present invention; Figure 12 This is a three-dimensional structural diagram of the extraction tank of the present invention.

[0020] In the diagram: 1-Processing tank, 2-Processing box, 3-Drive box, 4-Separation membrane, 5-Membrane separation unit, 51-Waste acid chamber, 52-Dilute acid chamber, 53-Inlet pipe, 54-Connecting pipe, 6-Moving part, 61-Cover-shaped frame, 62-L-shaped frame, 7-Positioning part, 71-Concave frame, 72-Sliding component, 721-Rotating shaft, 722-Sliding wheel, 723-Sliding groove, 73-Lower clamping plate, 74-Upper clamping plate, 75-Elastic component, 751-Sleeve, 752-Through rod, 753-Limiting plate, 754-Reset spring, 76 - Support plate, 77- Abutting component, 771- Central shaft, 772- Half cam, 773- Handle, 8- Drive unit, 81- Drive motor, 82- Drive shaft, 83- Transmission gear, 84- Concave strip, 85- Transmission rack, 9- Backwash section, 91- Rinse tank, 92- Transfer pipe, 93- Nozzle, 10- Recovery tank, 11- Seal, 111- Sealing plate, 112- Moving block, 113- Moving groove, 114- Abutting spring, 12- Extraction tank, 13- Exchange tank, 14- Concentration tank, 15- Electrolytic cell. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-12 This invention provides two technical solutions: Example 1: A hot-dip galvanizing waste acid resource utilization device includes a treatment tank 1, and a treatment box 2 is installed on the outside of the treatment tank 1. A drive box 3 is installed on the rear side of the treatment tank 1 and the treatment box 2. A linked waste liquid treatment mechanism is set inside the treatment tank 1, the treatment box 2 and the drive box 3 to realize the separation operation of acid and metal salt, and simultaneously realize the cleaning of the separation membrane 4. The waste liquid treatment mechanism includes: Membrane separation unit 5 enables the separation of acids and metal salts; The moving part 6 includes a cover frame 61. The bottom of the cover frame 61 is provided with a positioning part 7 for clamping the separation membrane 4, and an L-shaped frame 62 is installed on the top side of the cover frame 61. The L-shaped frame 62 realizes the horizontal movement of the positioning part 7 to the left and right sides through the driving unit 8 provided in the drive box 3. The backwashing unit 9 is located inside the treatment tank 2 and below the separation membrane 4 to perform backwashing operations. It includes a flushing tank 91 installed on the outer edge of the treatment tank 2, and a transmission pipe 92 is connected to the flushing tank 91 via a hydraulic pump to transmit the flushing water to the nozzle 93 installed on the transmission pipe 92.

[0023] In this process, hot-dip galvanizing waste acid continuously enters the waste acid chamber 51 from the inlet pipe 53. The chamber contains hydrochloric acid, Fe²⁺, Zn²⁺, etc. Under the action of concentration difference and membrane selective permeability, H⁺ and Cl⁻ pass through the anion exchange membrane into the dilute acid chamber 52, where metal ions are completely retained, achieving efficient separation of acid and metal salt. The recovered acid from the dilute acid chamber 52 enters the recovery tank 10.

[0024] Hydrochloric acid is recovered from waste acid in hot-dip galvanizing using membrane separation technology. The used separation membrane 4 is driven by the moving part 6 to enter the treatment tank 2, and the separation membrane 4 is rinsed by the online backwashing part 9. This realizes online backwashing regeneration and rapid switching reuse of the separation membrane, which significantly extends the membrane service life, reduces consumable costs, and realizes continuous and uninterrupted resource treatment of waste acid in hot-dip galvanizing, greatly improving treatment efficiency and equipment utilization.

[0025] Please see Figures 1-3 In this embodiment of the invention, the membrane separation unit 5 includes: Waste acid chamber 51 and dilute acid chamber 52 are both fixedly installed inside the treatment tank 1, with waste acid chamber 51 located above dilute acid chamber 52. Waste acid chamber 51 introduces hot-dip galvanized waste acid solution through inlet pipe 53, while dilute acid chamber 52 is connected to rinsing tank 91 through connecting pipe 54. A separation membrane 4 passes through between the waste acid chamber 51 and the dilute acid chamber 52. The separation membrane 4 is an anion exchange membrane used to separate the waste acid chamber 51 and the dilute acid chamber 52.

[0026] The separation membrane 4 is a long strip-shaped membrane that runs horizontally through both sides of the treatment tank 1. One end is used for separation inside the treatment tank, while the other end can be pulled into the treatment box 2 for rinsing. The waste liquid containing cations is thoroughly mixed with a stirring device that can add oxidants, which oxidizes the ferrous ions in the waste acid to ferric ions, laying the foundation for subsequent crystallization and recovery of iron-based products.

[0027] Please see Figure 1 and Figures 6-7 In this embodiment of the invention, a recovery tank 10 is installed at the bottom of the treatment tank 2. The acid liquid is transferred to the recovery tank 10 through a pipe at the bottom of the treatment tank 1. A sealing element 11 is provided in the gap between the treatment tank 1 and the waste acid chamber 51 and the dilute acid chamber 52 through the membrane to achieve liquid isolation.

[0028] Please see Figures 6-7 In this embodiment of the invention, the sealing element 11 includes: The sealing plate 111 is symmetrically arranged in the vertical direction and located on the outside of the gap in the treatment tank 1. A sealing gasket is installed on the sealing plate 111 facing the gap in the treatment tank 1. The movable block 112 is fixedly installed on the front and rear sides of the sealing plate 111, and the inner wall of the front and rear sides of the processing box 2 is provided with a movable groove 113. The movable block 112 is located inside the movable groove 113 and is adapted to slide. A stop spring 114 is installed between the opposite sides of the movable block 112 and the movable groove 113. The elastic force of the stop spring 114, without the influence of other external forces, makes the opposite sides of the sealing plate 111 contact.

[0029] The symmetrical sealing plates 111 are always clamped towards the center under the pushing force of the abutment spring 114, and the sealing gasket is tightly attached to the surface of the separation membrane 4 to prevent liquid from spraying from the treatment tank 1 into the treatment box 2.

[0030] Please see Figure 6 and Figures 8-10 In this embodiment of the invention, the positioning part 7 includes: The concave frame 71 moves left and right inside the processing box 2 via the sliding member 72, and a lower clamping plate 73 is fixedly installed below the concave frame 71. The upper clamping plate 74 is located between the concave frame 71 and the lower clamping plate 73, and the upper clamping plate 74 is connected to the concave frame 71 by an elastic member 75. A support plate 76 is fixedly installed on the lower clamping plate 73. An abutment member 77 is provided at the support plate 76 to make contact with the top surface of the upper clamping plate 74, and to complete the movement of the upper clamping plate 74 to the lower clamping plate 73 to clamp the edge of the separation membrane 4.

[0031] Please see Figure 6 In this embodiment of the invention, the sliding member 72 includes a rotating shaft 721 rotatably mounted on the concave frame 71, and a sliding wheel 722 is installed on the end face of the rotating shaft 721. The inner walls of the front and rear sides of the processing box 2 are provided with sliding grooves 723, and the sliding wheel 722 is located in the sliding groove 723 to adapt to movement without disengaging.

[0032] The rotating shafts 721 on both sides of the concave frame 71 drive the sliding wheels 722 to roll and move within the sliding grooves 723 on the inner wall of the processing box 2. The friction is small, the movement is smooth and there is no jamming. The sliding grooves 723 are limiting structures, so the sliding wheels can only move left and right and cannot disengage up and down, ensuring that the membrane does not deviate or shift when it moves.

[0033] Please see Figure 10 In this embodiment of the invention, the elastic element 75 includes: Sleeve 751 is fixedly installed on the top of upper clamping plate 74; A through rod 752 is fixedly installed on the top of the lower clamping plate 73, and the through rod 752 passes through the upper clamping plate 74 and extends into the inside of the sleeve 751. A limit plate 753 is installed at the top of the through rod 752, and a return spring 754 is installed between the limit plate 753 and the opposite side of the upper clamping plate 74. The elastic force of the return spring 754, which is not affected by other external forces, causes the upper clamping plate 74 to move away from the lower clamping plate 73.

[0034] Please see Figure 9 In this embodiment of the invention, the abutment 77 includes a central shaft 771, which is rotatably mounted on the side of the support plate 76. A half-cam 772 is fixedly mounted on the surface of the central shaft 771. A handle 773 is mounted on the top side of the edge of the half-cam 772. When the half-cam 772 is rotated by the handle 773, the distance from the contact point between the half-cam 772 and the upper clamping plate 74 to the rotation center of the half-cam 772 increases from small to large, thereby enabling the upper clamping plate 74 to move down and cooperate with the lower clamping plate 73 to complete the clamping operation.

[0035] The upper clamping plate 74 and the lower clamping plate 73 clamp the membrane edge through the abutment member 77, realizing the cooperation between membrane clamping and positioning and dynamic membrane sealing structure. This achieves integrated operation of stable membrane clamping, smooth displacement and dynamic sealing, effectively preventing membrane damage, leakage and cross-contamination, ensuring the purity of recovered hydrochloric acid and stable and safe operation of the equipment, significantly improving the overall durability of the equipment and reducing the failure rate.

[0036] Please see Figure 11 In this embodiment of the invention, the driving unit 8 includes: The drive motor 81 is fixedly installed on the inner wall of the drive box 3, and one end of the output shaft of the drive motor 81 is fixedly installed with the drive shaft 82 through a coupling. One end of the drive shaft 82 is rotatably connected to the outer wall of the processing tank 1, and a transmission gear 83 is fixedly installed on the surface of the drive shaft 82. A concave strip 84 is fixedly installed at the bottom of the inner cavity of the drive box 3. A transmission rack 85 is adapted to slide in the groove of the concave strip 84, and the two ends of the transmission rack 85 are connected and fixed to the end face of the L-shaped frame 62. The transmission rack 85 meshes with the surface of the transmission gear 83 for transmission.

[0037] The drive motor 81 is electrically connected to an external power source. The drive motor 81 has a locking function to keep the shaft locked after the machine stops. The drive motor 81 can perform forward and reverse operation. That is, if there is a clean separation membrane 4 in the processing tank 2 on one side, the clean separation membrane 4 will be moved into the processing tank 1. The used separation membrane 4 will be moved to the processing tank 2 on the other side to perform the rinsing operation.

[0038] The high-purity recovery and recycling of hydrochloric acid from waste acid is achieved through efficient separation via anion exchange membrane, significantly reducing the consumption of new acid and the production of hazardous sludge. Furthermore, the separation membrane 4 can be reciprocated by the drive unit 8, ensuring that while one part is being cleaned, the other part can be completely separated, effectively guaranteeing the efficiency of resource utilization of hot-dip galvanized waste acid.

[0039] Please see Figure 12 In this embodiment of the invention, an extraction tank 12 is installed below the treatment tank 2. The extraction tank 12 treats the cationic waste liquid in the treatment tank 2. An exchange tank 13 and a concentration tank 14 are installed inside the extraction tank 12. An electrolytic cell 15 is provided around the extraction tank 12. The cationic waste liquid passes through the exchange tank 13 and the concentration tank 14 in sequence and flows into the electrolytic cell 15 to electrolyze and form cathode zinc.

[0040] In the exchange tank 13, ion exchange resin is used to separate zinc ions from waste acid. According to the composition of the waste acid and the concentration of zinc ions, a suitable ion exchange resin is selected, and a multi-stage ion exchange column is adopted. The waste acid passes through each stage of the exchange column in sequence to achieve the gradual adsorption and concentration of zinc ions. Then, a suitable desorbent (such as deionized water) is selected to desorb the adsorption saturated resin, and the zinc ions are washed off the resin. The extracted solution with zinc ions is transferred to the concentration tank 14. The zinc ion concentration in the zinc chloride solution is increased by the evaporator. Finally, it is transferred to the electrolytic cell 15. Using zinc electrowinning, under the action of direct current, the zinc ions in the electrolyte are reduced to metallic zinc by gaining electrons at the cathode (aluminum plate or lead-silver alloy plate).

[0041] Example 2 differs from Example 1 in that: the present invention also discloses a method for the resource utilization of waste acid from hot-dip galvanizing, specifically including the following steps: S1. The hot-dip galvanizing waste acid is introduced into the treatment tank 1, and the separation of acid and metal salt is achieved by using the membrane separation unit 5. S2. After processing for a period of time, the separation membrane 4 to be used is moved to the processing box 2 by the moving part 6, and the separation membrane 4 to be used is backwashed by the backwashing part 9.

[0042] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0043] During operation, hot-dip galvanized waste acid containing hydrochloric acid, zinc ions, and ferrous ions enters the waste acid chamber 51 through the inlet pipe 53, and the dilute acid chamber 52 is connected to the rinsing tank 91 through the connecting pipe 54 to allow the water to enter. In this way, the waste acid and the water are separated by the separation membrane 4. The hydrochloric acid permeates through the membrane into the dilute acid chamber 52, while the metal cations are blocked by the membrane and retained in the waste acid chamber 51. After a period of separation, the drive motor 81 rotates, driving the drive shaft 82 to rotate. The drive shaft 82 drives the transmission gear 83 to rotate, causing the meshing transmission rack 85 to move. The transmission rack 85 slides horizontally along the concave strip 84. The transmission rack 85 drives the L-shaped frame 62, the cover frame 61, and the positioning part 7 to move synchronously, so that the used separation membrane 4 enters the processing box 2. At this time, the clean separation membrane 4 in the other processing box 2 moves to the processing tank 1. Then, the dilute acid stored and recovered in the rinsing tank 91 is used as the rinsing liquid. The hydraulic pump installed inside the rinsing tank 91 sends the rinsing liquid into the transmission pipe 92. The nozzle 93 sprays from below the membrane upward to form a reverse rinsing, which flushes away the metal salts and suspended solids that are blocking the membrane pores. The rinsing waste liquid falls into the bottom of the treatment tank for unified collection. When the separation membrane 4 needs to be replaced, the handle 773 is rotated to drive the half cam 772 to rotate. The distance between the half cam 772 and the upper clamping plate 74 at the center of rotation decreases from large to small. Under the elastic force of the return spring 754, the upper clamping plate 74 moves upward and separates from the lower clamping plate 73, thereby replacing the separation membrane 4. After replacement, the half cam 772 is rotated to increase the distance between the half cam and the upper clamping plate 74 at the center of rotation, and the elastic force of the return spring 754 is overcome to clamp the membrane edge between the upper clamping plate 74 and the lower clamping plate 73. Meanwhile, as the positioning part 7 moves toward the sealing member 11, the inclined surfaces at the leading edges of the upper clamping plate 74 and the lower clamping plate 73 contact the arc at the tail of the symmetrical sealing plate 111, and after continuing to move, the sealing plate 111 is opened, while the upper clamping plate 74 and the lower clamping plate 73 seal the gap in the processing tank 1. Conversely, under the elastic force of the abutment spring 114, the sealing plate 111 seals the gap in the processing tank 1.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for the resource utilization treatment of waste acid from hot-dip galvanizing, comprising a treatment tank (1), and a treatment box (2) installed on the outside of the treatment tank (1), and a drive box (3) installed on the rear side of the treatment tank (1) and the treatment box (2), characterized in that: Furthermore, the treatment tank (1), treatment box (2), and drive box (3) are equipped with a linked waste liquid treatment mechanism to achieve the separation operation of acid and metal salt, and simultaneously clean the separation membrane (4). The waste liquid treatment mechanism includes: The membrane separation unit (5) enables the separation of acid and metal salt; The moving part (6) includes a cover frame (61), and a positioning part (7) for clamping the separation membrane (4) is provided at the bottom of the cover frame (61). An L-shaped frame (62) is installed on the top side of the cover frame (61). The L-shaped frame (62) realizes the horizontal movement of the positioning part (7) to the left and right sides through the driving unit (8) provided in the drive box (3). The backwashing unit (9) is located inside the treatment tank (2) and below the separation membrane (4) to perform backwashing operation. It includes a flushing tank (91) installed on the outer edge of the treatment tank (2), and the flushing tank (91) is connected to a transmission pipe (92) by a hydraulic pump to transmit the water used for flushing to the nozzle (93) installed on the transmission pipe (92).

2. The hot-dip galvanizing waste acid resource utilization device according to claim 1, characterized in that: The membrane separation unit (5) includes: Waste acid chamber (51) and dilute acid chamber (52) are both fixedly installed inside the treatment tank (1), and the waste acid chamber (51) is located above the dilute acid chamber (52). The waste acid chamber (51) introduces hot-dip galvanized waste acid liquid through the inlet pipe (53), while the dilute acid chamber (52) is connected to the rinsing tank (91) through the connecting pipe (54). A separation membrane (4) is provided between the waste acid chamber (51) and the dilute acid chamber (52). The separation membrane (4) is an anion exchange membrane used to separate the waste acid chamber (51) and the dilute acid chamber (52).

3. The hot-dip galvanizing waste acid resource utilization device according to claim 2, characterized in that: The bottom of the treatment tank (2) is equipped with a recovery tank (10). The bottom of the treatment tank (1) is connected to the recovery tank (10) via a pipe. A sealing element (11) is provided in the gap between the treatment tank (1) and the waste acid chamber (51) and the dilute acid chamber (52) to achieve liquid isolation.

4. The hot-dip galvanizing waste acid resource utilization device according to claim 3, characterized in that: The seal (11) includes: The sealing plate (111) is symmetrically arranged in the vertical direction and located on the outside of the gap of the treatment tank (1). A sealing gasket is installed on the sealing plate (111) facing the gap of the treatment tank (1). The movable block (112) is fixedly installed on the front and rear sides of the sealing plate (111), and the inner wall of the front and rear sides of the processing box (2) is provided with a movable groove (113). The movable block (112) is located inside the movable groove (113) and is adapted to slide. A stop spring (114) is installed between the opposite sides of the movable block (112) and the movable groove (113). The elastic force of the stop spring (114) without the influence of other external forces makes the opposite sides of the sealing plate (111) contact each other.

5. The hot-dip galvanizing waste acid resource utilization device according to claim 1, characterized in that: The positioning part (7) includes: The concave frame (71) moves left and right inside the processing box (2) via the sliding member (72), and a lower clamping plate (73) is fixedly installed below the concave frame (71). The upper clamping plate (74) is located between the concave frame (71) and the lower clamping plate (73), and the upper clamping plate (74) and the concave frame (71) are connected by an elastic element (75). A support plate (76) is fixedly installed on the lower clamping plate (73). An abutment element (77) is provided at the support plate (76) to achieve contact with the top surface of the upper clamping plate (74) and to complete the movement of the upper clamping plate (74) to the lower clamping plate (73) to clamp the edge of the separation membrane (4).

6. The hot-dip galvanizing waste acid resource utilization device according to claim 5, characterized in that: The sliding member (72) includes a rotating shaft (721) rotatably mounted on the concave frame (71), and a sliding wheel (722) is installed on the end face of the rotating shaft (721). The front and rear inner walls of the processing box (2) are provided with sliding grooves (723), and the sliding wheel (722) is located in the sliding groove (723) to adapt to movement and not disengage.

7. The hot-dip galvanizing waste acid resource utilization device according to claim 5, characterized in that: The elastic element (75) includes: Sleeve (751) is fixedly installed on the top of upper clamping plate (74); A through rod (752) is fixedly installed on the top of the lower clamping plate (73), and the through rod (752) passes through the upper clamping plate (74) and extends into the inside of the sleeve (751). A limit plate (753) is installed at the top of the through rod (752), and a return spring (754) is installed between the opposite sides of the limit plate (753) and the upper clamping plate (74). The elastic force of the return spring (754) without the influence of other external forces causes the upper clamping plate (74) to move away from the lower clamping plate (73). The abutment (77) includes a central shaft (771), which is rotatably mounted on the side of the support plate (76). A half cam (772) is fixedly mounted on the surface of the central shaft (771). A handle (773) is mounted on the top side of the edge of the half cam (772). When the half cam (772) is rotated by the handle (773), the distance from the contact point between the half cam (772) and the upper clamping plate (74) to the rotation center of the half cam (772) increases from small to large, and the upper clamping plate (74) moves down to cooperate with the lower clamping plate (73) to complete the clamping operation.

8. The hot-dip galvanizing waste acid resource utilization device according to claim 1, characterized in that: The drive unit (8) includes: The drive motor (81) is fixedly installed on the inner wall of the drive box (3), and one end of the output shaft of the drive motor (81) is fixedly installed with the drive shaft (82) through the coupling. One end of the drive shaft (82) is rotatably connected to the outer wall of the processing tank (1), and the surface of the drive shaft (82) is fixedly installed with the transmission gear (83). A concave strip (84) is fixedly installed at the bottom of the inner cavity of the drive box (3). A transmission rack (85) is adapted to slide in the groove of the concave strip (84), and the two ends of the transmission rack (85) are connected and fixed to the end face of the L-shaped frame (62). The transmission rack (85) meshes with the surface of the transmission gear (83) for transmission.

9. The hot-dip galvanizing waste acid resource utilization device according to claim 1, characterized in that: An extraction tank (12) is installed below the treatment tank (2), and the extraction tank (12) is used to treat the cationic waste liquid in the treatment tank (2). An exchange tank (13) and a concentration tank (14) are installed inside the extraction tank (12), and an electrolytic cell (15) is set around the extraction tank (12). The cationic waste liquid passes through the exchange tank (13) and the concentration tank (14) in sequence and flows into the electrolytic cell (15) to electrolyze and form cathode zinc.

10. A method for the resource recovery treatment of waste acid from hot-dip galvanizing, comprising the waste acid resource recovery treatment device for hot-dip galvanizing as described in any one of claims 1-9, characterized in that: Specifically, the following steps are included: S1. The hot-dip galvanized waste acid is introduced into the treatment tank (1), and the separation of acid and metal salt is achieved by using the membrane separation unit (5). S2. After processing for a period of time, the separation membrane (4) being used is moved to the processing tank (2) by the moving part (6), and the separation membrane (4) being used is backwashed by the backwashing part (9).

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