A selective purification and recovery device for electronic-grade phosphate waste liquid

Abstract

The application discloses a kind of electronic grade phosphate waste liquid selective purification and recovery equipment, belong to waste liquid processing and resource recovery technical field, solve the existing purification equipment packing replacement cumbersome, cannot automatically identify adsorption saturation, operation and maintenance cost high problem.Equipment includes purification tank and the parallelly connected multiple groups of purification pipe in it, replaceable purification column is inserted in purification pipe, and magnetic valve is separately arranged on the upper and lower end of purification pipe, and synchronous conduction liquid path is passed through built-in magnet when purification column is inserted in place, and it is automatically cut off when pulling out.Three-stage adsorption filter layer is arranged in purification column, and the snap locking structure of swelling trigger is configured at the bottom, and it is automatically unlocked and ejected when resin adsorption saturation swells, and synchronous cut-off liquid path is realized, passive type saturation automatic identification and tool-free quick replacement are realized, with high-precision selective phosphate purification and recovery efficiency, adapt to electronic grade waste liquid processing demand.

Description

Technical Field

[0001] This invention relates to the field of industrial waste liquid purification and resource recovery equipment, and in particular to a selective purification and recovery equipment for electronic-grade phosphate waste liquid. Background Technology

[0002] Electronic-grade phosphate wastewater is widely generated in processes such as semiconductor etching, photovoltaic cleaning, and electronic chemical production. It is characterized by high phosphate concentration, high recovery value of valuable components, complex impurities, and stringent requirements for effluent quality. Selective recovery of phosphate from wastewater using adsorption is the mainstream technological approach for achieving wastewater resource utilization and compliant discharge.

[0003] Existing adsorption purification equipment mostly adopts a fixed-bed packing structure, which has obvious shortcomings during operation: First, the adsorption packing needs to be shut down, disassembled and replaced after saturation. The operation requires manually closing the inlet and outlet valves, which is cumbersome and prone to waste liquid leakage, resulting in low operation and maintenance efficiency. Second, it cannot automatically identify the adsorption saturation state of the packing, relying on manual periodic sampling and testing, which makes it difficult to respond to saturation conditions in a timely manner and easily leads to problems such as excessive effluent. Third, some automatic switching equipment relies on electronic control sensors and electric valves, which have a high failure rate and insufficient reliability under the acid and alkali corrosive conditions of electronic waste liquid, making it difficult to adapt to the high-precision purification requirements of electronic waste liquid. Summary of the Invention

[0004] The technical problem to be solved by this invention is that existing electronic-grade phosphate waste liquid purification equipment is inconvenient to replace the packing material, requires manual shutdown to operate the valves, cannot automatically identify the adsorption saturation state, has high operation and maintenance costs, and lacks purification selectivity. Therefore, we propose an electronic-grade phosphate waste liquid selective purification and recovery equipment.

[0005] To achieve the above objectives, this application adopts the following technical solution: A selective purification and recovery device for electronic-grade phosphate waste liquid includes a purification tank. The top of the purification tank is provided with an inlet chamber and the bottom of the purification tank is provided with an outlet chamber. An inlet pipe is connected to one side wall of the inlet chamber and an outlet pipe is connected to one side wall of the outlet chamber. Multiple sets of purification pipes are vertically connected inside the purification tank. The upper end of the purification pipe extends into the interior of the inlet chamber and the lower end extends into the interior of the outlet chamber. Each purification pipe is equipped with a replaceable purification column. The section of the purification tube located in the inlet chamber is equipped with a first magnetic valve, and the section of the purification tube located in the outlet chamber is equipped with a second magnetic valve. An inlet is located at the upper end of the replaceable purification column, corresponding to the first magnetic valve, and a third magnet is installed inside the inlet. An outlet is located at the lower end of the replaceable purification column, corresponding to the second magnetic valve, and a fourth magnet is installed inside the outlet. When the replaceable purification column is inserted into the purification tube, the third magnet activates the first magnetic valve through magnetic force, and the fourth magnet activates the second magnetic valve through magnetic force. When the replaceable purification column is pulled out, the first and second magnetic valves close simultaneously to cut off the liquid path. The replaceable purification column is arranged from top to bottom as follows: a pre-filter layer, a phosphate main adsorption layer and a phosphate selective resin layer. A porous piston is arranged below the phosphate selective resin layer in the replaceable purification column. A vertical trigger rod is fixedly connected to the center of the bottom of the porous piston. The replaceable purification column has a locking section at its bottom, which contains a locking spring, a lifting block, three or more sets of locking rods, and a sector-shaped locking block. A triangular locking block is located on the inner wall of the bottom of the purification tube, and a push-out spring is located at the bottom of the purification tube. When the replaceable purification column is inserted into place, the locking spring drives the lifting block, which, via the locking rod, engages with the sector-shaped locking block, locking the replaceable purification column. When the phosphate selective resin layer is saturated and swollen, it pushes the porous piston and trigger rod downwards. The trigger rod drives the lifting block, which, via the locking rod, releases the sector-shaped locking block from the triangular locking block. The push-out spring ejects the replaceable purification column upwards, simultaneously closing the first and second magnetic valves to cut off the waste liquid passage.

[0006] Furthermore, a first retainer is fixedly connected to the inner wall of the channel of the first magnetic valve, and a first piston rod is passed through the center of the first retainer. The first piston rod is slidably engaged with the first retainer. A first sealing piston is fixedly connected to the end of the first piston rod facing the water inlet. A first spring abuts between the first sealing piston and the first retainer. A first magnet with opposite magnetic poles to the third magnet is embedded inside the first sealing piston.

[0007] Furthermore, a third retainer is fixedly connected to the inner wall of the inlet, and a third magnet is fixedly installed on the side end face of the third retainer facing the first magnetic valve.

[0008] Furthermore, a second retainer is fixedly connected to the inner wall of the channel of the second magnetic valve, and a second piston rod is inserted through the center of the second retainer. The second piston rod is slidably engaged with the second retainer. A second sealing piston is fixedly connected to the end of the second piston rod facing the water outlet. A second spring abuts between the second sealing piston and the second retainer. A second magnet with opposite magnetic poles to the fourth magnet is embedded inside the second sealing piston.

[0009] Furthermore, a fourth retainer is fixedly connected to the inner wall of the outlet, and a fourth magnet is fixedly installed on the side end face of the fourth retainer facing the second magnetic valve.

[0010] Furthermore, the interior of the replaceable purification column is fixed with a first porous partition, a second porous partition, and a third porous partition in sequence from top to bottom; a pre-filter layer is filled between the first porous partition and the second porous partition, a phosphate main adsorption layer is filled between the second porous partition and the third porous partition, a porous piston is slidably disposed below the third porous partition, and a phosphate selective resin layer is filled between the third porous partition and the porous piston.

[0011] Furthermore, the pre-filter layer is a quartz sand particle packing layer, the phosphate main adsorption layer is a lanthanum-modified high-purity active alumina particle packing layer, and the phosphate selective resin layer is a phosphate-specific selective macroporous strong basic anion exchange resin packing layer.

[0012] Furthermore, the particle diameters of the filler in the pre-filter layer, the phosphate main adsorption layer, and the phosphate selective resin layer are all larger than the opening diameters of the first porous partition, the second porous partition, the third porous partition, and the porous piston.

[0013] Furthermore, a sealing partition is fixed between the locking section and the column of the replaceable purification column, and the triggering rod penetrates downward through the sealing partition and extends into the interior of the locking section; the locking spring is fixed to the inner bottom surface of the locking section, and the lifting block abuts against the top of the locking spring; the side wall of the locking section is provided with a telescopic groove corresponding to the fan-shaped locking block, and the center of the fan-shaped locking block is rotatably connected to the inner wall of the bottom of the telescopic groove; the two ends of the locking connecting rod are respectively hinged to the side wall of the lifting block and the side of the fan-shaped locking block.

[0014] Furthermore, the triangular locking block is fixed in a ring shape to the bottom inner wall of the purification tube, the push-out spring is fixed to the center of the inner bottom surface of the purification tube, and the top end face of the push-out spring is opposite to the bottom end face of the locking section; the bottom end face of the trigger pressure rod is arranged directly opposite the center of the top surface of the lifting block.

[0015] The technical effects and advantages of this invention are as follows: 1. This equipment adopts a cartridge structure that links the magnetic valve and the purification column. Inserting the purification column automatically opens the liquid path, and pulling it out automatically cuts off the path. No manual operation of the valve is required, and there is no waste liquid leakage during the replacement process. The operation is convenient and efficient, greatly reducing the difficulty of operation and maintenance.

[0016] 2. This equipment relies on the swelling characteristics of resin after adsorption saturation to trigger the unlocking and ejection mechanism. It is a purely physical, passive automatic identification of the adsorption saturation state, requiring no electrical sensors or power components. It has high reliability, is suitable for acid and alkali corrosion conditions of electronic waste liquid, and can respond to saturation conditions in a timely manner to avoid exceeding the standards for effluent.

[0017] 3. This equipment adopts a three-stage packing gradient purification structure, with pre-filtration to remove impurities, large-capacity adsorption in the main adsorption layer, and deep and precise recovery by selective resin. It has strong selectivity for phosphates and high purification accuracy, which can meet the purification and recovery accuracy requirements of electronic-grade waste liquids and realize the resource recovery of phosphates.

[0018] 4. This equipment adopts a parallel structure of multiple purification pipes. The replacement of a single purification column will not affect the normal operation of the remaining pipelines. It can realize online replacement without stopping the machine, ensuring the continuous operation of the treatment system and adapting to electronic waste liquid treatment scenarios of different scales. Attached Figure Description

[0019] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the purification tube and replaceable purification column structure of the present invention; Figure 4 This is a cross-sectional view of the purification tube and replaceable purification column of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 For the present invention Figure 4 Enlarged structural diagram at point B; Figure 7 For the present invention Figure 4 Enlarged structural diagram at point C.

[0020] Legend: 1. Purification tank; 2. Inlet chamber; 3. Outlet chamber; 4. Inlet pipe; 5. Outlet pipe; 6. Purification pipe; 7. Replaceable purification column; 8. First magnetic valve; 801. First retainer; 802. First piston rod; 803. First sealing piston; 804. First spring; 805. First magnet; 806. First sealing ring; 9. Second magnetic valve; 901. Second retainer; 902. Second piston rod; 903. Second sealing piston; 904. Second spring; 905. Second magnet; 906. 10. Second sealing ring; 10. Inlet; 1001. Third retainer; 1002. Third magnet; 11. Outlet; 1101. Fourth retainer; 1102. Fourth magnet; 12. First perforated baffle; 13. Second perforated baffle; 14. Third perforated baffle; 15. Perforated piston; 16. Trigger rod; 17. Engaging section; 18. Sealing baffle; 19. Engaging spring; 20. Lifting block; 21. Locking rod; 22. Fan-shaped locking block; 23. Telescopic groove; 24. Triangular locking block; 25. Push-out spring. Detailed Implementation

[0021] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Example 1

[0023] This embodiment is a basic implementation of the present invention, which fully discloses the overall structure and complete working process of the selective purification and recovery equipment for electronic-grade phosphate waste liquid, and is suitable for the purification and recovery of phosphate waste liquid in small and medium-sized electronic chemical production lines.

[0024] like Figures 1 to 7 As shown, a selective purification and recovery device for electronic-grade phosphate waste liquid includes a vertically arranged purification tank 1. The purification tank 1 is made of 316L stainless steel and lined with a polytetrafluoroethylene anti-corrosion layer on the inner wall to withstand the acid and alkali corrosion of electronic waste liquid. The design pressure is not less than 0.4MPa. The top of the purification tank 1 is provided with a water inlet chamber 2 and the bottom is provided with a water outlet chamber 3. One side wall of the water inlet chamber 2 is connected to a water inlet pipe 4, and one side wall of the water outlet chamber 3 is connected to a water outlet pipe 5. The waste liquid to be treated is sent in through the water inlet pipe 4, and the purified liquid after treatment is discharged through the water outlet pipe 5.

[0025] Multiple sets of purification pipes 6 are vertically inserted inside the purification tank 1. In this embodiment, a total of 19 sets of purification pipes 6 are arranged in a ring and evenly distributed. The upper end of the purification pipe 6 extends into the water inlet chamber 2 and the lower end extends into the water outlet chamber 3. Each set of purification pipes 6 is arranged in parallel and operates independently without interfering with each other. Each purification pipe 6 is fitted with a replaceable purification column 7. The replaceable purification column 7 is made of UPVC material, and the outer wall is fitted with the inner wall of the purification pipe 6 with a gap, so that the insertion guide is smooth.

[0026] The section of the purification pipe 6 located in the inlet chamber 2 is equipped with a first magnetic valve 8, and the section of the purification pipe 6 located in the outlet chamber 3 is equipped with a second magnetic valve 9. A first retainer 801 is fixedly connected to the inner wall of the channel of the first magnetic valve 8. The first retainer 801 has a spoke structure, which ensures smooth flow of liquid and provides stable support. A first piston rod 802 is inserted through the center of the first retainer 801, and the first piston rod 802 slides in cooperation with the first retainer 801. A first sealing piston 803 is fixedly connected to the end of the first piston rod 802 facing the inlet 10. A first spring 804 abuts between the first sealing piston 803 and the first retainer 801. A first magnet 805 is embedded inside the first sealing piston 803. The second magnetic valve 9 is symmetrical to the first magnetic valve 8 in structure. A second retainer 901 is fixedly connected to the inner wall of its channel. A second piston rod 902 is passed through the center of the second retainer 901. A second sealing piston 903 is fixed at the end of the second piston rod 902. A second spring 904 abuts between the two. A second magnet 905 is embedded inside the second sealing piston 903.

[0027] A water inlet 10 is provided at the upper end of the replaceable purification column 7, corresponding to the first magnetic valve 8. A third retainer 1001 is fixedly connected to the inner wall of the water inlet 10. A third magnet 1002 is fixedly installed on the side of the third retainer 1001 facing the first magnetic valve 8. The opposite magnetic poles of the third magnet 1002 and the first magnet 805 are arranged opposite each other. A water outlet 11 is provided at the lower end of the replaceable purification column 7, corresponding to the second magnetic valve 9. A fourth retainer 1101 is fixedly connected to the inner wall of the water outlet 11. The side of the fourth retainer 1101 facing the second magnetic valve 9 is fixedly installed with... Equipped with a fourth magnet 1102, the fourth magnet 1102 and the second magnet 905 are arranged with opposite magnetic poles facing each other; when the replaceable purification column 7 is inserted into the purification tube 6, the magnetic attraction of the third magnet 1002 overcomes the elastic force of the first spring 804, pulling the first sealing piston 803 to move and opening the first magnetic valve 8. Similarly, the fourth magnet 1102 opens the second magnetic valve 9; when the replaceable purification column 7 is pulled out, the magnetic attraction disappears, the first spring 804 and the second spring 904 push the sealing piston to reset, and the first magnetic valve 8 and the second magnetic valve 9 close synchronously, automatically cutting off the liquid circuit.

[0028] The replaceable purification column 7 has, from top to bottom, three porous baffles: a first porous baffle 12, a second porous baffle 13, and a third porous baffle 14. All porous baffles are made of polypropylene with uniformly distributed water-passing holes on their surfaces, resulting in an opening rate of 40%. A pre-filter layer, consisting of quartz sand particles with a particle size of 0.5–1.0 mm, is filled between the first porous baffle 12 and the second porous baffle 13. This layer is used to filter out suspended particles and mechanical impurities from the waste liquid. A phosphate main adsorption layer, consisting of lanthanum-modified high-purity active phosphate, is filled between the second porous baffle 13 and the third porous baffle 14. An alumina particle packing layer with a particle size of 1.0–2.0 mm is used for large-capacity adsorption of phosphate in waste liquid, reducing the load on subsequent resin layer treatment. A porous piston 15 is slidably arranged below the third porous partition 14. A phosphate-selective resin layer is filled between the third porous partition 14 and the porous piston 15. This is a phosphate-specific selective macroporous strong basic anion exchange resin packing layer, used for deep selective adsorption of phosphate to ensure effluent accuracy. The diameter of each packing particle is larger than the opening diameter of the corresponding porous partition and porous piston 15 to prevent the packing from being lost with the liquid flow.

[0029] The bottom of the replaceable purification column 7 is provided with a locking section 17. A sealing partition 18 is fixed between the locking section 17 and the column body of the replaceable purification column 7 to achieve sealed isolation between the packing cavity and the locking mechanism. A vertical trigger rod 16 is fixedly connected to the bottom center of the porous piston 15. The trigger rod 16 penetrates downward through the sealing partition 18 and extends into the interior of the locking section 17. A dynamic sealing ring is provided at the penetration point to prevent waste liquid from seeping into the locking section.

[0030] The engaging section 17 is equipped with an engaging spring 19, a lifting block 20, three sets of locking rods 21, and a sector-shaped locking block 22. The engaging spring 19 is fixed to the inner bottom surface of the engaging section 17, and the lifting block 20 abuts against the top of the engaging spring 19. The side wall of the engaging section 17 is provided with a telescopic groove 23 corresponding to the sector-shaped locking block 22, and the center of the sector-shaped locking block 22 is rotatably connected to the inner wall of the bottom of the telescopic groove 23. The two ends of the locking rod 21 are respectively hinged to the side wall of the lifting block 20 and the side of the sector-shaped locking block 22. A triangular locking block 24 is fixed in a ring shape on the inner wall of the bottom of the purification tube 6, and a push-out spring 25 is fixed at the center of the inner bottom surface of the purification tube 6. The top end face of the push-out spring 25 is opposite to the bottom end face of the engaging section 17. The bottom end face of the trigger rod 16 is arranged directly opposite the center of the top surface of the lifting block 20.

[0031] The complete workflow of this embodiment is as follows: S1. Purification column insertion and connection: Insert the replaceable purification column 7 downward along the purification tube 6. When the column is in place, the inlet 10 is aligned with the first magnetic valve 8 and the outlet 11 is aligned with the second magnetic valve 9. The magnetic attraction between the third magnet 1002 and the first magnet 805 overcomes the elastic force of the first spring 804, pulling the first sealing piston 803 upward, and the first magnetic valve 8 is fully connected. Similarly, the fourth magnet 1102 drives the second sealing piston 903 downward, and the second magnetic valve 9 is fully connected, and the liquid circuit is automatically connected.

[0032] S2. Automatic locking and positioning: After the replaceable purification column 7 is inserted into place, the locking spring 19 pushes the lifting block 20 to move upward. Through the locking link 21, it drives the three sets of fan-shaped locking blocks 22 to rotate outward around the axis and extend out of the telescopic groove 23, forming a locking limit with the triangular locking block 24 on the inner wall of the purification tube 6, locking the replaceable purification column 7 in the purification tube 6 to prevent the liquid flow impact from causing it to float.

[0033] S3. Staged Purification and Recycling: The electronic-grade phosphate waste liquid to be treated enters the inlet chamber 2 through the inlet pipe 4, and is diverted into each replaceable purification column 7 through the first magnetic valves 8 and inlet 10. It flows sequentially through the pre-filter layer, the main phosphate adsorption layer, and the selective phosphate resin layer. The pre-filter layer traps suspended impurities, the main adsorption layer completes the adsorption and enrichment of most of the phosphate, and the selective resin layer deeply and selectively adsorbs residual phosphate, achieving high-precision purification. The purified liquid flows into the outlet chamber 3 through the outlet 11 and the second magnetic valve 9, and is finally discharged and collected through the outlet pipe 5.

[0034] S4. Saturation Trigger Unlock: As the adsorption process proceeds, the amount of phosphate adsorbed by the phosphate selective resin layer gradually increases, causing the resin to swell in volume. This pushes the porous piston 15 downwards along the inner wall of the column, causing the trigger lever 16 to move downwards simultaneously. When the resin adsorption reaches saturation, the bottom end of the trigger lever 16 contacts and pushes the lifting block 20 downwards, compressing the locking spring 19. This, via the locking linkage 21, pulls the fan-shaped locking block 22 inwards and retracts it into the telescopic groove 23, releasing the engagement with the triangular locking block 24. The replaceable purification column 7 is then unlocked. S5. Automatic Pop-up Replacement: After the engagement is released, the compressed ejection spring 25 releases its elasticity, pushing the replaceable purification column 7 upwards a certain distance. This causes the third magnet 1002 to separate from the first magnet 805, and the fourth magnet 1102 to separate from the second magnet 905. The magnetic attraction disappears, and the first spring 804 and the second spring 904 push the sealing piston back to its original position. The first magnetic valve 8 and the second magnetic valve 9 close simultaneously, automatically cutting off this liquid path. Maintenance personnel can directly remove and replace the pop-up replaceable purification column 7 by lifting it upwards. No manual operation of valves is required throughout the process, and there is no risk of waste liquid leakage. After replacement, the device will automatically resume purification operation.

[0035] Example 2

[0036] Based on Example 1, this embodiment optimizes the packing configuration and triggering accuracy to meet the requirements of high-precision and high-purity recovery of electronic-grade waste liquid, further improving the selective purification and recovery purity of phosphate, and is suitable for high-requirement electronic-grade phosphate waste liquid treatment scenarios such as semiconductor manufacturing processes.

[0037] In this embodiment, the three-stage packing material in the replaceable purification column 7 is upgraded with electronic-grade precision. The pre-filter layer adopts a double-layer composite structure. The upper layer is high-purity quartz sand particles with a particle size of 0.8-1.2 mm, and the lower layer is a polytetrafluoroethylene microporous filter membrane with a precision of 0.22 μm. This can filter out micron-sized suspended particles and colloidal impurities in the waste liquid, preventing impurities from contaminating the subsequent adsorption packing material and ensuring the purity of the recovered phosphate. The filling rate of this layer is 75% of the effective volume of the corresponding chamber, balancing filtration throughput and retention precision.

[0038] The phosphate main adsorption layer uses highly loaded lanthanum-modified mesoporous alumina filler with a particle size of 1.5–2.0 mm, a lanthanum loading of no less than 12%, and a specific surface area of ​​no less than 350 m² / g. Its phosphate adsorption capacity is increased by more than 40% compared to ordinary modified alumina, and its adsorption selectivity is significantly improved. It can preferentially adsorb phosphate ions under various coexisting anion conditions, greatly reducing the treatment load on subsequent resin layers. The filling rate of this layer is 70% of the effective volume of the corresponding chamber, ensuring sufficient adsorption capacity and hydraulic retention time.

[0039] The phosphate-selective resin layer uses electronic-grade, specialized phosphate chelating selective resin with a particle size of 0.6–0.8 mm. Its selectivity for phosphate is more than 50 times higher than that for coexisting anions such as sulfate and nitrate. After adsorption saturation, high-purity phosphate solution can be recovered by elution with a low-concentration alkaline solution. This layer fills 65% of the effective volume of the corresponding chamber, ensuring high-precision deep purification.

[0040] Meanwhile, this embodiment optimizes the precision of the triggering mechanism. Two fluororubber sealing rings are added to the outer wall of the porous piston 15 to improve the sliding sealing performance and prevent liquid leakage from the piston side wall from affecting the swelling triggering accuracy. The triggering rod 16 is set as a threaded adjustable structure, which can be adjusted by rotating the rod extension length to accurately adjust the triggering stroke, adapt to the swelling rate characteristics of different grades of resin, ensure accurate triggering at the adsorption saturation point, and avoid premature or delayed triggering.

[0041] In this embodiment, an online conductivity and phosphate concentration detection interface is added to the side wall of the outlet chamber 3 of the purification tank 1. External detection instruments can be connected to monitor the quality of the effluent in real time. Together with the automatic pop-out mechanism, a double guarantee is formed to ensure that the effluent from the electronic waste liquid treatment is stable and meets the standards, and the purity of the recovered phosphate product meets the requirements for electronic grade reuse.

[0042] Example 3

[0043] Based on Example 1, this embodiment is optimized for modularization and large-scale adaptation. The number and configuration of purification pipes can be flexibly adjusted according to the treatment volume and water quality requirements to adapt to different scales of electronic-grade phosphate waste liquid treatment scenarios, thereby improving the equipment's versatility and ease of operation and maintenance.

[0044] In this embodiment, the purification tube 6 and the replaceable purification column 7 adopt a standardized modular design. The interface size of a single purification tube is uniform, and multiple purification tubes can be flexibly configured in the purification tank 1 according to the processing requirements, arranged in a ring array. Correspondingly, the replaceable purification column 7 has uniform specifications, and purification columns of different workstations can be interchanged, reducing spare parts inventory costs.

[0045] In this embodiment, the top of the replaceable purification column 7 is equipped with a lifting handle for easy insertion and removal by maintenance personnel; the side of the column is marked with the packing specifications and adsorption capacity to facilitate the differentiation of different types of purification columns and avoid incorrect installation. The equipment has a high degree of modularity and can be flexibly spliced ​​and expanded to meet the needs of all scenarios from laboratory pilot tests to industrial-scale processing.

[0046] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A selective purification and recovery device for electronic-grade phosphate waste liquid, characterized in that, The device includes a purification tank, which has an inlet chamber at the top and an outlet chamber at the bottom. An inlet pipe is connected to one side wall of the inlet chamber, and an outlet pipe is connected to one side wall of the outlet chamber. Multiple sets of purification pipes run vertically through the purification tank, with the upper end of each purification pipe extending into the inlet chamber and the lower end extending into the outlet chamber. Each purification pipe is fitted with a replaceable purification column. The section of the purification tube located in the inlet chamber is equipped with a first magnetic valve, and the section of the purification tube located in the outlet chamber is equipped with a second magnetic valve. An inlet is located at the upper end of the replaceable purification column, corresponding to the first magnetic valve, and a third magnet is installed inside the inlet. An outlet is located at the lower end of the replaceable purification column, corresponding to the second magnetic valve, and a fourth magnet is installed inside the outlet. When the replaceable purification column is inserted into the purification tube, the third magnet activates the first magnetic valve through magnetic force, and the fourth magnet activates the second magnetic valve through magnetic force. When the replaceable purification column is pulled out, the first and second magnetic valves close simultaneously to cut off the liquid path. The replaceable purification column is provided with a pre-filter layer, a phosphate main adsorption layer and a phosphate selective resin layer in sequence from top to bottom. A porous piston is provided below the phosphate selective resin layer in the replaceable purification column. A vertical trigger rod is fixedly connected to the center of the bottom of the porous piston. The replaceable purification column has a locking section at its bottom, which contains a locking spring, a lifting block, three or more sets of locking rods, and a fan-shaped locking block. The inner wall of the bottom of the purification tube has a triangular locking block, and the bottom of the purification tube has a push-out spring. When the replaceable purification column is inserted into place, the locking spring drives the lifting block to move, and the locking rod drives the fan-shaped locking block to engage with the triangular locking block, locking the replaceable purification column. When the phosphate selective resin layer is saturated and swollen, it pushes the porous piston and the trigger rod downward. The trigger rod drives the lifting block to move, and the locking rod drives the fan-shaped locking block to disengage from the triangular locking block. The push-out spring ejects the replaceable purification column upward, simultaneously closing the first magnetic valve and the second magnetic valve to cut off the waste liquid passage. A first retainer is fixedly connected to the inner wall of the channel of the first magnetic valve. A first piston rod is passed through the center of the first retainer and the first piston rod is slidably engaged with the first retainer. A first sealing piston is fixedly connected to the end of the first piston rod facing the water inlet. A first spring abuts between the first sealing piston and the first retainer. A first magnet with opposite magnetic poles to the third magnet is embedded inside the first sealing piston. A second retainer is fixedly connected to the inner wall of the channel of the second magnetic valve. A second piston rod is passed through the center of the second retainer and the second piston rod is slidably engaged with the second retainer. A second sealing piston is fixedly connected to the end of the second piston rod facing the water outlet. A second spring abuts between the second sealing piston and the second retainer. A second magnet with opposite magnetic poles to the fourth magnet is embedded inside the second sealing piston.

2. The selective purification and recovery equipment for electronic-grade phosphate waste liquid according to claim 1, characterized in that, A third retainer is fixedly connected to the inner wall of the water inlet, and the third magnet is fixedly installed on the side end face of the third retainer facing the first magnetic valve.

3. The selective purification and recovery equipment for electronic-grade phosphate waste liquid according to claim 1, characterized in that, A fourth retainer is fixedly connected to the inner wall of the outlet, and the fourth magnet is fixedly installed on the side end face of the fourth retainer facing the second magnetic valve.

4. The selective purification and recovery equipment for electronic-grade phosphate waste liquid according to claim 1, characterized in that, The replaceable purification column is internally fixed with a first porous partition, a second porous partition, and a third porous partition from top to bottom; the pre-filter layer is filled between the first porous partition and the second porous partition, the phosphate main adsorption layer is filled between the second porous partition and the third porous partition, the porous piston is slidably disposed below the third porous partition, and the phosphate selective resin layer is filled between the third porous partition and the porous piston.

5. The selective purification and recovery equipment for electronic-grade phosphate waste liquid according to claim 4, characterized in that, The pre-filter layer is a quartz sand particle filling layer, the phosphate main adsorption layer is a lanthanum-modified high-purity active alumina particle filling layer, and the phosphate selective resin layer is a phosphate-specific selective macroporous strong basic anion exchange resin filling layer.

6. The selective purification and recovery equipment for electronic-grade phosphate waste liquid according to claim 4, characterized in that, The particle diameters of the filler in the pre-filter layer, the phosphate main adsorption layer, and the phosphate selective resin layer are all larger than the opening diameters of the first porous partition, the second porous partition, the third porous partition, and the porous piston.

7. The selective purification and recovery equipment for electronic-grade phosphate waste liquid according to claim 1, characterized in that, A sealing partition is fixed between the engaging section and the column of the replaceable purification column. The triggering rod penetrates downward through the sealing partition and extends into the interior of the engaging section. The engaging spring is fixed to the inner bottom surface of the engaging section, and the lifting block abuts against the top of the engaging spring. The side wall of the engaging section has a telescopic groove corresponding to the fan-shaped locking block, and the center of the fan-shaped locking block is rotatably connected to the inner wall of the bottom of the telescopic groove. The two ends of the locking connecting rod are respectively hinged to the side wall of the lifting block and the side of the fan-shaped locking block.

8. The selective purification and recovery equipment for electronic-grade phosphate waste liquid according to claim 7, characterized in that, The triangular locking block is fixed in a ring shape to the bottom inner wall of the purification tube. The push-out spring is fixed to the center of the inner bottom surface of the purification tube. The top end face of the push-out spring is opposite to the bottom end face of the locking section. The bottom end face of the trigger pressure rod is arranged directly opposite to the center of the top surface of the lifting block.

Images