Process and device for recovering phosphoric acid in aluminum foil formation waste liquid

Abstract

The invention discloses a method and a device for recycling phosphoric acid in aluminum foil formation waste liquid, and relates to the technical field of recycling of phosphoric acid in aluminum foil formation waste liquid. The device for recycling phosphoric acid in aluminum foil formation waste liquid comprises a recycling tank and an ion exchange resin module, and the ion exchange resin module is arranged in the recycling tank; a plurality of ion exchange spaces stacked in the vertical direction are arranged in the ion exchange resin module, each ion exchange space is filled with ion exchange resin, and the liquid outlet of one ion exchange space in every two adjacent ion exchange spaces is communicated with the liquid inlet of the other ion exchange space. By arranging the recovery tank and the ion exchange resin module and arranging a plurality of ion exchange spaces in the ion exchange resin module, the aluminum foil formation waste liquid is in full contact with ion exchange resin in the vertical direction and the transverse direction, the recovery efficiency of phosphoric acid is improved, cyclic utilization of phosphoric acid resources is achieved, and the energy consumption is reduced. And adverse effects on the environment are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of the recovery of phosphoric acid from aluminum foil formation waste liquid, and particularly relates to a method and a device for recovering phosphoric acid from aluminum foil formation waste liquid. Background Art

[0003] With the rapid development of the electronic industry, aluminum electrolytic capacitors have been widely used in electronic devices. As an important material in the production process of aluminum electrolytic capacitors, phosphoric acid is used in corrosion, formation, and working electrolyte. At present, the main treatment method for aged phosphoric acid by formation foil production enterprises is to discharge it into the sewage treatment station. Although this treatment method is simple and easy to implement, the direct discharge of aged phosphoric acid will cause the phosphorus content in the sewage to seriously exceed the standard, polluting the environment; on the other hand, a large amount of phosphorus resources are wasted, resulting in waste of resources. Summary of the Invention

[0005] The main purpose of the present invention is to propose a method and a device for recovering phosphoric acid from aluminum foil formation waste liquid, aiming to recover aged phosphoric acid in industrial wastewater to realize the recycling of phosphorus resources.

[0006] To achieve the above object, the device for recovering phosphoric acid from aluminum foil formation waste liquid proposed by the present invention includes: A recovery tank, the top and bottom of the recovery tank are respectively communicated with a waste liquid inlet pipe and a drain pipe; An ion exchange resin module, the ion exchange resin module is arranged in the recovery tank, and a waste liquid inlet is arranged at the position corresponding to the waste liquid inlet pipe at the top of the ion exchange resin module; Wherein, a plurality of vertically stacked ion exchange spaces are arranged in the ion exchange resin module, each ion exchange space is filled with ion exchange resin, and each ion exchange space is provided with a drain port and an inlet port that are spaced apart in the radial direction of the recovery tank, and the drain port of one ion exchange space in two adjacent ion exchange spaces is communicated with the inlet port of the other ion exchange space; the waste liquid inlet pipe is used to introduce the aluminum foil formation waste liquid into the waste liquid inlet, and the aluminum foil formation waste liquid sequentially passes through a plurality of ion exchange spaces from top to bottom, and a continuous waste liquid flow flowing horizontally is formed in each ion exchange space, so that after the continuous waste liquid flow is purified by the ion exchange resin, it is discharged from the drain pipe.

[0007] In one embodiment, the ion exchange resin module includes a plurality of ion exchange resin structures which are stacked vertically. Each ion exchange resin structure encloses an ion exchange space, and a liquid inlet and a liquid outlet are respectively arranged at the top and bottom of each ion exchange resin structure.

[0008] In one embodiment, the ion exchange resin structure includes a cylinder body and a liquid guide plate. The cylinder body is a hollow column with an open top. An ion exchange space communicating with the opening is arranged inside the cylinder body. The liquid guide plate is arranged on the outer wall of the cylinder body. A liquid inlet communicating with the ion exchange space is formed at the top of the liquid guide plate, and a liquid outlet is also formed on the outer wall of the cylinder body and is arranged near the bottom of the cylinder body.

[0009] In one embodiment, two adjacent liquid guide plates are arranged oppositely.

[0010] In one embodiment, the inner bottom wall of the cylinder body opposite to the opening is inclined towards the liquid outlet.

[0011] In one embodiment, a sealing ring is sleeved at the joint of two adjacent ion exchange resin structures.

[0012] In one embodiment, the number of the ion exchange resin modules is multiple, and the multiple ion exchange resin modules are stacked vertically in the recovery tank. Adjacent two ion exchange resin modules are communicated through an ion concentration detection module.

[0013] In one embodiment, a plurality of guiding structures are respectively arranged on the inner wall of the recovery tank at positions corresponding to the liquid inlets and liquid outlets of the ion exchange resin modules. Each guiding structure extends vertically, and the liquid outlet of one ion exchange space and the liquid inlet of another ion exchange space in two adjacent ion exchange spaces are communicated inside one guiding structure.

[0014] In one embodiment, a plurality of liquid supply pipes are installed at the top of the recovery tank. The number of the liquid supply pipes is the same as that of the guiding structures and they are arranged in one-to-one correspondence. Each liquid supply pipe is used to introduce cleaning water or resin regeneration liquid into the corresponding guiding structure.

[0015] The present invention also provides a method for recovering phosphoric acid from aluminum foil formation waste liquid, which applies the recovery device for phosphoric acid from aluminum foil formation waste liquid as described above. The method for recovering phosphoric acid from aluminum foil formation waste liquid includes: Removing suspended particulate matters and organic impurities from the aluminum foil formation waste liquid to obtain a pretreated waste liquid. The pre-treated waste liquid is selectively separated through a reverse osmosis membrane to obtain a phosphoric acid enriched liquid; The phosphoric acid enriched liquid is introduced into the waste liquid inlet pipe at the top of the recovery tank, and the phosphoric acid enriched liquid flows through multiple ion exchange spaces; In each layer of the ion exchange space, the phosphoric acid enriched liquid continuously flows horizontally along the radial direction of the recovery tank, and Cu 2+ 、Fe 3+ metal ions are adsorbed and removed by the ion exchange resin to form a purified liquid; The purified liquid is discharged from the drain pipe at the bottom of the recovery tank to recover the phosphoric acid.

[0016] The technical solution of the present invention realizes the efficient recovery and purification of phosphoric acid in the aluminum foil forming waste liquid by setting a recovery tank and an ion exchange resin module. The setting of multiple ion exchange spaces in the ion exchange resin module enables the aluminum foil forming waste liquid to be in full contact with the ion exchange resin in both the vertical and horizontal directions, improving the recovery efficiency of phosphoric acid, realizing the recycling of phosphoric acid resources, and reducing the adverse impact on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0019] Figure 1 is an exploded structural schematic diagram of an embodiment of a recovery device for phosphoric acid in aluminum foil forming waste liquid provided by the present invention; Figure 2 is a structural schematic diagram of an embodiment of a recovery tank related to the present invention; Figure 3 is a structural schematic diagram of an embodiment of an ion exchange resin module related to the present invention; Figure 4 is a structural schematic diagram of an embodiment of an ion exchange resin structure related to the present invention; Figure 5 is a structural schematic diagram of an embodiment of a liquid supply pipe related to the present invention; Figure 6 is a flow schematic diagram of an embodiment of a recovery method for phosphoric acid in aluminum foil forming waste liquid provided by the present invention.

[0020] Explanation of the reference numerals in the drawings: 100, Recycling Tank; 200, Ion Exchange Resin Module; 300, Sealing Ring; 400, Ion Concentration Detection Module; 500, Guide Structure; 110, Waste Liquid Inlet Pipe; 120, Drain Pipe; 130, Liquid Supply Pipe; 201, Ion Exchange Space; 202, Waste Liquid Inlet; 203, Liquid Inlet; 204, Drain Outlet; 210, Ion Exchange Resin Structure; 211, Cylinder Body; 212, Liquid Guide Plate.

[0021] The realization, functional features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0026] With the rapid development of the electronics industry, aluminum electrolytic capacitors have been widely used in electronic devices. Phosphoric acid, as an important material in the production process of aluminum electrolytic capacitors, is used in processes such as corrosion, formation, and working electrolyte. Currently, the main way for formation foil production enterprises to deal with aged phosphoric acid is to discharge it into the sewage treatment station for treatment. Although this treatment method is simple and easy to implement, the direct discharge of aged phosphoric acid will cause the phosphorus content in the sewage to seriously exceed the standard, polluting the environment; on the other hand, a large amount of phosphorus resources are wasted, resulting in resource waste.

[0027] To solve this technical problem, the present invention proposes a method and device for recovering phosphoric acid from aluminum foil formation waste liquid.

[0028] Please refer to Figure 1 and Figure 2 , in an embodiment of the present invention, the device for recovering phosphoric acid from aluminum foil formation waste liquid includes a recovery tank 100 and an ion exchange resin module 200. The top and bottom of the recovery tank 100 are respectively connected with a waste liquid inlet pipe 110 and a drain pipe 120; the ion exchange resin module 200 is arranged in the recovery tank 100, and a waste liquid inlet 202 is arranged at the position corresponding to the waste liquid inlet pipe 110 at the top of the ion exchange resin module 200; wherein, a plurality of vertically stacked ion exchange spaces 201 are arranged in the ion exchange resin module 200, each ion exchange space 201 is filled with ion exchange resin, and each ion exchange space 201 is provided with a drain port 204 and a liquid inlet 203 that are radially spaced apart along the recovery tank 100. The drain port 204 of one ion exchange space 201 in two adjacent ion exchange spaces 201 is communicated with the liquid inlet 203 of the other ion exchange space 201; the waste liquid inlet pipe 110 is used to introduce aluminum foil formation waste liquid into the waste liquid inlet 202, and the aluminum foil formation waste liquid sequentially passes through a plurality of ion exchange spaces 201 from top to bottom, and a continuous waste liquid flow flowing horizontally is formed in each ion exchange space 201, so that after the continuous waste liquid flow is purified by the ion exchange resin, it is discharged from the drain pipe 120.

[0029] Specifically, the ion exchange resin module 200 is arranged in the recovery tank 100, and a waste liquid inlet 202 is arranged at the position corresponding to the waste liquid inlet pipe 110 at its top. The module contains a plurality of vertically stacked ion exchange spaces 201, and each space is filled with ion exchange resin. These spaces are respectively provided with a drain port 204 and a liquid inlet 203 that are radially spaced apart, and two adjacent spaces are communicated through the drain port 204 and the liquid inlet 203.

[0030] During the operation, the spent aluminum foil conversion waste liquid passes through multiple ion exchange spaces 201 from top to bottom in sequence. In each space, the spent aluminum foil conversion waste liquid forms a continuous flow with a lateral flow, and comes into full contact with the ion exchange resin filled in the ion exchange space 201, adding a lateral flow process on the basis of the traditional vertical flow. This increases the contact time and contact area between the ion exchange resin and the spent aluminum foil conversion waste liquid, thereby improving the phosphoric acid recovery efficiency. It solves the problem of excessive phosphorus content in sewage caused by traditional treatment methods and avoids a large amount of phosphorus resource waste. By adding the lateral flow process, the ion exchange efficiency is improved, enabling more phosphoric acid to be effectively separated from the wastewater and recovered.

[0031] In addition, adjacent two layers of ion exchange spaces 201 are only connected through the discharge and inlet ports, ensuring independent operation between each layer, improving the continuity and stability of the recovery process, and making the contact between the ion exchange resin and the spent aluminum foil conversion waste liquid more sufficient, thus achieving a better purification effect.

[0032] In an optional implementation manner, the ion exchange resin module 200 is detachably arranged in the recovery tank 100. This facilitates the cleaning of the ion exchange resin module 200 and the regeneration operation of the resin filled therein, prolongs the service life of the ion exchange resin, and reduces the operating cost. When the adsorption capacity of the ion exchange resin in a certain layer decreases, the corresponding ion exchange resin module 200 can be conveniently cleaned, regenerated or taken out to ensure the continuous and efficient operation of the phosphoric acid recovery device.

[0033] In the technical solution provided by the present invention, by setting the recovery tank 100 and the ion exchange resin module 200, the efficient recovery and purification of phosphoric acid in the spent aluminum foil conversion waste liquid are realized. The setting of multiple ion exchange spaces 201 in the ion exchange resin module 200 enables the spent aluminum foil conversion waste liquid to come into full contact with the ion exchange resin in both the vertical and horizontal directions, improves the phosphoric acid recovery efficiency, realizes the recycling of phosphoric acid resources, and reduces the adverse impact on the environment.

[0034] Please continue to refer to Figure 1 and refer to Figure 3 In the embodiment of the present invention, the ion exchange resin module 200 includes a plurality of ion exchange resin structures 210. The plurality of ion exchange resin structures 210 are stacked vertically. Each ion exchange resin structure 210 encloses an ion exchange space 201, and a liquid inlet 203 and a liquid discharge port 204 are respectively arranged at the top and bottom of each ion exchange resin structure 210.

[0035] Specifically, a plurality of ion exchange resin structures 210 are stacked vertically to form a plurality of independent ion exchange spaces 201, and each ion exchange space 201 is filled with ion exchange resin. The aluminum foil formation waste liquid passes through each ion exchange space 201 from top to bottom in sequence, and fully contacts with the ion exchange resin in each ion exchange space 201, realizing the efficient adsorption and purification of phosphoric acid. The internal space of the ion exchange resin module 200 is fully utilized, the contact time and contact area between the waste liquid and the ion exchange resin are increased, and the recovery efficiency of phosphoric acid is improved.

[0036] More specifically, after the aluminum foil formation waste liquid enters the recovery tank 100 from the waste liquid inlet pipe 110, under the dual action of water pressure and gravity, it passes through a plurality of ion exchange spaces 201 in the ion exchange resin module 200 from top to bottom in sequence. When the aluminum foil formation waste liquid enters each ion exchange space 201, it can flow evenly into the ion exchange space 201 from the liquid inlet 203 at the top, and form a continuous flow flowing horizontally in the ion exchange space 201. After fully contacting with the ion exchange resin, it then flows out from the liquid discharge port 204 at the bottom. The residence time and contact area of the waste liquid in each ion exchange space 201 are increased. After continuous treatment through a plurality of ion exchange spaces 201, the purified waste liquid is discharged from the discharge pipe 120, and the adsorption efficiency of phosphoric acid is improved.

[0037] Please continue to refer to Figure 1 and Figure 3 ,and refer to Figure 4 In the embodiment of the present invention, the ion exchange resin structure 210 includes a cylinder body 211 and a liquid guide plate 212. The cylinder body 211 is a hollow column with an open top. An ion exchange space 201 communicating with the opening is arranged inside the cylinder body 211. The liquid guide plate 212 is arranged on the outer wall of the cylinder body 211. A liquid inlet 203 communicating with the ion exchange space 201 is opened at the top of the liquid guide plate 212. A liquid discharge port 204 is also opened on the outer wall of the cylinder body 211, and the liquid discharge port 204 is arranged close to the bottom of the cylinder body 211.

[0038] Specifically, the cylinder body 211 is a hollow column with an open top. An ion exchange space 201 communicating with the opening is arranged inside the cylinder body 211, and the ion exchange resin is filled in the ion exchange space 201. The liquid guide plate 212 is arranged on the outer wall of the cylinder body 211. A liquid inlet 203 communicating with the ion exchange space 201 is opened at the top of the liquid guide plate 212, so that the aluminum foil formation waste liquid can flow evenly into the ion exchange space 201 from the liquid inlet 203.

[0039] It is worth noting that the outer wall of the cylinder 211 is also provided with a drain port 204, which is arranged near the bottom of the cylinder 211. The aluminum foil waste liquid is formed to flow from top to bottom in the ion exchange space 201, and after fully contacting with the ion exchange resin, it flows out from the drain port 204 at the bottom. This flow mode increases the residence time of the waste liquid in the ion exchange space 201 and improves the adsorption efficiency of phosphoric acid. At the same time, the arrangement of the drain port 204 near the bottom of the cylinder 211 ensures that the waste liquid in the ion exchange space 201 can fully flow and exchange, avoiding the generation of dead corners.

[0040] It should be understood that the present embodiment further optimizes the flow path and contact mode of the waste liquid in each ion exchange space 201. The liquid inlet 203 at the top of the liquid guide plate 212 allows the waste liquid to flow evenly into the ion exchange space 201, avoiding the problem of excessive or slow local flow rate. The drain port 204 at the bottom of the cylinder 211 ensures that the waste liquid in the ion exchange space 201 can flow and exchange fully, thereby improving the adsorption efficiency of phosphoric acid. At the same time, this top-down flow mode increases the residence time of the waste liquid in the ion exchange space 201, further enhancing the contact and exchange effect between the waste liquid and the ion exchange resin.

[0041] In the embodiment of the present invention, two adjacent liquid guiding plates 212 are arranged opposite to each other.

[0042] Specifically, the return flow of the waste liquid is realized by the liquid guide plates 212 of two adjacent ion exchange resin structures 210 arranged relatively to each other. After the waste liquid flows out of the discharge port 204 of one ion exchange resin structure 210, due to the staggered and symmetrical arrangement of the adjacent liquid guide plates 212, the waste liquid is guided into the liquid guide plate 212 of the next ion exchange resin structure 210 and flows horizontally again in this structure. This return flow mode not only increases the contact time between the waste liquid and the ion exchange resin, but also enables the waste liquid to be more evenly distributed in each ion exchange resin structure 210, thereby improving the adsorption and recovery efficiency of phosphoric acid.

[0043] In the embodiment of the present invention, the inner bottom wall of the cylinder 211 opposite to the opening is inclined toward the liquid discharge port 204 .

[0044] Specifically, in conventional ion exchange equipment, the inner bottom wall of the cylinder 211 is usually flat, which easily causes waste liquid to accumulate at the bottom. This embodiment provides a structure that is conducive to the flow of waste liquid by setting the inner bottom wall of the cylinder 211 to be inclined toward the drain port 204. When the waste liquid passes through the ion exchange resin structure 210, it is assisted by gravity and naturally flows toward the drain port 204, which is conducive to forming a horizontal continuous flow while reducing the accumulation of waste liquid at the bottom of the cylinder 211.

[0045] Please continue readingFigure 4 , in an embodiment of the present invention, a sealing ring 300 is sleeved at the junction of two adjacent ion exchange resin structures 210.

[0046] Specifically, in this embodiment, by sleeving the sealing ring 300 at the junction of adjacent ion exchange resin structures 210, the problem of waste liquid leakage is avoided. At the junction of two adjacent ion exchange resin structures 210, a sealing ring 300 is provided, and the sealing ring 300 is tightly sleeved at the connection of the two structures to ensure that the waste liquid does not leak when flowing through each structure.

[0047] It should be understood that the sealing ring 300 can be made of various corrosion-resistant and wear-resistant materials, such as rubber, silica gel, etc. The shape and size of the sealing ring 300 can be selected according to specific application requirements to ensure the best sealing effect.

[0048] Please continue to refer to Figure 1 and Figure 3 In an embodiment of the present invention, the number of ion exchange resin modules 200 is multiple, and the multiple ion exchange resin modules 200 are stacked vertically in the recovery tank 100, and adjacent two ion exchange resin modules 200 are connected through an ion concentration detection module 400.

[0049] Specifically, between two adjacent ion exchange resin modules 200, an ion concentration detection module 400 is provided for monitoring the concentration of phosphate ions in the waste liquid. The ion concentration detection module 400 includes a hollow ring body with an open top. The hollow ring body is provided with an inlet head corresponding to the liquid discharge port 204 of the previous ion exchange resin module 200 and a liquid discharge head corresponding to the liquid inlet port 203 of the next ion exchange resin module 200. The waste liquid flows into the ion concentration detection module 400 from the liquid discharge port 204 of the previous module, and after being detected, it flows into the liquid inlet port 203 of the next module from the liquid discharge head. By analyzing the detection data of each ion concentration detection module 400, the change of the phosphate ion concentration of the waste liquid at each treatment stage can be grasped, so as to optimize and control the operation parameters of each ion exchange resin module 200, such as flow rate, temperature, etc., to achieve the best treatment effect.

[0050] As an alternative embodiment, an ion selective electrode is installed in the ion concentration detection module 400, which is suitable for detecting Cu 2+ , Fe 3+ concentration in the phosphoric acid waste liquid.

[0051] Please continue to refer to Figure 1 , and refer to Figure 5In an embodiment of the present invention, a plurality of guiding structures 500 are respectively arranged on the inner wall of the recovery tank 100 corresponding to the liquid inlet 203 and the liquid outlet 204 of the ion exchange resin module 200. Each guiding structure 500 extends vertically, and the liquid outlet 204 of one ion exchange space 201 and the liquid inlet 203 of another ion exchange space 201 in two adjacent ion exchange spaces 201 are communicated through one guiding structure 500.

[0052] Specifically, by arranging a plurality of guiding structures 500 on the inner wall of the recovery tank 100, the flow path of the waste liquid is optimized, and the installation and maintenance processes of the ion exchange module are simplified. Each guiding structure 500 extends vertically to form a guiding groove, and the ion exchange resin module 200 is detachably arranged along the guiding groove. The aluminum foil forming waste liquid flows directly from the liquid outlet 204 of one ion exchange space 201 into the liquid inlet 203 of another adjacent ion exchange space 201 through the guiding groove, ensuring the smooth flow of the waste liquid between adjacent modules. The guiding structure 500 not only facilitates the quick installation or disassembly of the ion exchange resin module 200 as needed, is convenient for maintenance and replacement, but also can maintain the stability of the ion exchange resin module 200, avoiding movement or misalignment during operation.

[0053] Please continue to refer to Figure 1 、 Figure 2 and Figure 5 In an embodiment of the present invention, a plurality of liquid supply pipes 130 are installed at the top of the recovery tank 100. The number of the liquid supply pipes 130 is the same as that of the guiding structures 500 and they are arranged in one-to-one correspondence. Each liquid supply pipe 130 is used to introduce cleaning water or resin regeneration liquid into the corresponding guiding structure 500.

[0054] In the foregoing embodiment, since one ion exchange resin module 200 only includes two ion exchange resin structures 210, and the liquid inlets 203 of the two ion exchange resin structures 210 are distributed on both sides of the recovery tank 100, the liquid supplied by the liquid supply pipes 130 can directly reach the corresponding ion exchange resin structures 210 through the guiding structures 500, and the implementation efficiency of cleaning or resin regeneration is higher, and the ion exchange resin in a certain ion exchange space 201 can be operated specifically. Moreover, since the guiding structure 500 is closely attached to the outer wall of the ion exchange resin module 200, a closed space is formed jointly by the outer wall of the ion exchange structure and the guiding structure 500, which can further conduct guiding management on the liquid in the guiding structure 500.

[0055] In this embodiment, by installing the corresponding number of liquid supply pipes 130 at the top of the recovery tank 100, and each liquid supply pipe 130 directly corresponds to one guiding structure 500, independent cleaning or regeneration of each ion exchange resin structure 210 is realized.

[0056] Specifically, each liquid supply pipe 130 ensures that the liquid can directly flow into the corresponding guiding structure 500. Through the guiding structure 500, the liquid is effectively guided to the liquid inlet 203 of each ion exchange resin structure 210. The operator can selectively clean or regenerate one or more ion exchange resin structures 210 as needed without disturbing other parts, thereby improving the operation flexibility and the system efficiency.

[0057] It should be noted that since the guiding structure 500 is closely attached to the outer wall of the ion exchange resin module 200, the outer wall of the ion exchange structure and the guiding structure 500 together form a sealed space, which can further guide the liquid in the guiding structure 500 and avoid liquid leakage and waste.

[0058] This embodiment can independently operate on a single or multiple ion exchange resin structures 210 according to actual needs, avoiding unnecessary operations and saving resources. At the same time, since there is no need to disassemble the whole system for cleaning or regeneration, the downtime of the system is greatly reduced and the operation efficiency of the system is improved.

[0059] Please continue to refer to FIGS. 1 to Figure 5 , and refer to FIG. 6. The present invention also provides a method for recovering phosphoric acid from aluminum foil forming waste liquid. The method for recovering phosphoric acid from aluminum foil forming waste liquid uses the device for recovering phosphoric acid from aluminum foil forming waste liquid as described above. The method for recovering phosphoric acid from aluminum foil forming waste liquid includes: Step S10, removing suspended particulate matters and organic impurities in the aluminum foil forming waste liquid to obtain pretreated waste liquid; Step S20, selectively separating the pretreated waste liquid through a reverse osmosis membrane to obtain a phosphoric acid enrichment liquid; Step S30, introducing the phosphoric acid enrichment liquid into the waste liquid inlet pipe 110 at the top of the recovery tank 100 to make the phosphoric acid enrichment liquid flow through the multi-layer ion exchange space 201; Step S40, within each layer of the ion exchange space 201, the phosphoric acid enrichment liquid continuously flows horizontally along the radial direction of the recovery tank 100, and Cu2+ and Fe3+ metal ions are adsorbed and removed through the ion exchange resin to form a purified liquid; Step S50, discharging the purified liquid from the drain pipe 120 at the bottom of the recovery tank 100 to recover the phosphoric acid.

[0060] Specifically, in step S10, the aluminum foil waste liquid is first passed through a primary filtration system, which is equipped with a coarse filter and a fine filter. The coarse filter is used to capture larger suspended matter, such as debris and larger solid particles; the fine filter further removes smaller suspended matter. Subsequently, the waste liquid enters a filter containing activated carbon, which can adsorb organic compounds and some heavy metal ions, such as copper and iron, in the waste liquid, thereby reducing the burden of subsequent processing steps.

[0061] In step S20, the preliminarily cleaned waste liquid is pumped into a reverse osmosis system, which is equipped with a high-pressure pump and a reverse osmosis membrane. The reverse osmosis membrane can effectively block phosphate ions and organic matter with larger molecular weights, while allowing water molecules and some small molecular inorganic salts to pass through, so as to maximize the recovery rate and concentration of phosphoric acid.

[0062] In step S30 , the phosphoric acid-enriched liquid enters the ion exchange resin module 200 through the waste liquid inlet pipe 110 located at the top of the recovery tank 100 , and forms a waste liquid continuous flow that flows horizontally in each ion exchange space 201 .

[0063] In step S40, in the ion exchange module, the phosphoric acid-enriched solution is contacted with an ion exchange resin having a Cu 2+ , Fe 3+ High affinity for metal ions. During the ion exchange process, the resin will adsorb these metal ions, while phosphoric acid is not adsorbed due to its larger molecular structure and charge characteristics, thus maintaining a higher concentration in the effluent.

[0064] In step S50, the purified liquid after ion exchange treatment is discharged through the drain pipe 120 located at the bottom of the recovery tank 100. The collected liquid is rich in phosphoric acid and contains almost no harmful metal ions. This liquid can be used in industrial production or as a fertilizer.

[0065] Through the above steps, the method for recovering phosphoric acid from aluminum foil forming waste liquid of the present invention effectively recovers phosphoric acid from the waste liquid and removes harmful metal ions at the same time, thereby improving resource utilization and reducing environmental pollution.

[0066] It should be understood that the specific structure of the device for recovering phosphoric acid in aluminum foil waste liquid refers to the above-mentioned embodiment. Since the method for recovering phosphoric acid in aluminum foil waste liquid adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0067] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A recovery device for phosphoric acid in aluminum foil formation waste liquid, characterized in that, Comprising: A recovery tank, with a waste liquid inlet pipe and a drain pipe respectively connected to the top and bottom of the recovery tank; An ion exchange resin module, which is arranged in the recovery tank. A waste liquid inlet is arranged at the position corresponding to the waste liquid inlet pipe at the top of the ion exchange resin module; Wherein, a plurality of vertically stacked ion exchange spaces are arranged in the ion exchange resin module. Each ion exchange space is filled with ion exchange resin, and each ion exchange space is provided with a drain port and a liquid inlet that are distributed at intervals along the radial direction of the recovery tank. The drain port of one ion exchange space and the liquid inlet of another ion exchange space in two adjacent ion exchange spaces are communicated; the waste liquid inlet pipe is used to introduce the aluminum foil chemical conversion waste liquid into the waste liquid inlet. The aluminum foil chemical conversion waste liquid sequentially passes through a plurality of ion exchange spaces from top to bottom, and a continuously flowing waste liquid flow in the horizontal direction is formed in each ion exchange space. After the continuously flowing waste liquid is purified by the ion exchange resin, it is discharged from the drain pipe.

2. The device for recovering phosphoric acid from aluminum foil chemical waste liquid according to claim 1, characterized in that: The ion exchange resin module includes a plurality of ion exchange resin structures, and the plurality of ion exchange resin structures are vertically stacked. Each ion exchange resin structure encloses an ion exchange space, and the liquid inlet and the drain port are respectively arranged at the top and bottom of each ion exchange resin structure.

3. The recovery device for phosphoric acid in the aluminum foil formation waste liquid according to claim 2, wherein, The ion exchange resin structure includes a cylinder body and a liquid guide plate. The cylinder body is a hollow column body with an open top. An ion exchange space communicated with the opening is arranged in the cylinder body. The liquid guide plate is arranged on the outer wall of the cylinder body. The top of the liquid guide plate is provided with a liquid inlet communicated with the ion exchange space, and the outer wall of the cylinder body is also provided with the drain port, and the drain port is arranged close to the bottom of the cylinder body.

4. The device for recovering phosphoric acid from aluminum foil chemical waste liquid according to claim 3, characterized in that: Two adjacent liquid guide plates are arranged oppositely.

5. The device for recovering phosphoric acid from aluminum foil chemical waste liquid according to claim 3, characterized in that: The inner bottom wall of the cylinder body opposite to the opening is inclined towards the drain port.

6. The recovery device for phosphoric acid in the aluminum foil formation waste liquid according to claim 2, wherein, A sealing ring is sleeved at the joint of two adjacent ion exchange resin structures.

7. The device for recovering phosphoric acid from aluminum foil chemical waste liquid according to any one of claims 1 to 6, characterized in that: The number of the ion exchange resin modules is multiple, and the multiple ion exchange resin modules are vertically stacked and arranged in the recovery tank. Two adjacent ion exchange resin modules are communicated through an ion concentration detection module.

8. The recovery device for phosphoric acid in the aluminum foil forming waste liquid according to any one of claims 1 to 6, characterized in that, A plurality of guiding structures are respectively arranged on the inner wall of the recovery tank at the positions corresponding to the liquid inlet and the drain port of the ion exchange resin module. Each guiding structure extends vertically. The drain port of one ion exchange space and the liquid inlet of another ion exchange space in two adjacent ion exchange spaces are communicated through one of the guiding structures.

9. The recovery device for phosphoric acid in the aluminum foil formation waste liquid according to claim 8, wherein, A plurality of liquid supply pipes are installed at the top of the recovery tank. The number of the liquid supply pipes is the same as that of the guiding structures and they are arranged in one-to-one correspondence. Each liquid supply pipe is used to introduce cleaning water or resin regeneration liquid into the corresponding guiding structure.

10. A method for recovering phosphoric acid from aluminum foil formation waste liquid, characterized in that, Applying the recovery device for phosphoric acid in the aluminum foil chemical conversion waste liquid according to any one of claims 1 to 9; The method for recovering phosphoric acid in the aluminum foil chemical conversion waste liquid includes: Removing suspended particulate matters and organic impurities in the aluminum foil chemical conversion waste liquid to obtain a pretreated waste liquid; Perform selective separation on the pre-treated waste liquid through a reverse osmosis membrane to obtain a phosphoric acid enrichment solution; Introduce the phosphoric acid enrichment solution into the waste liquid inlet pipe at the top of the recovery tank, and allow the phosphoric acid enrichment solution to flow through a multi-layer ion exchange space; In each layer of the ion exchange space, the phosphoric acid-enriched liquid continuously flows in the radial direction of the recovery tank, and the Cu is removed by adsorption of the ion exchange resin. 2+ , Fe 3+ Metal ions, forming a purified liquid; Discharge the purified liquid from the drain pipe at the bottom of the recovery tank to recover the phosphoric acid.

Images