A method for recycling and regenerating a renewable ion resin filter

Abstract

The present invention provides a method for recycling and regenerating a renewable ion resin filter, comprising: S1 making a filter cloth; S2 assembling the filter; S3 the filter recycling step; S4 the filter regeneration process. The present invention makes the filter cloth by a glue-free process. When assembling the filter, first, the filter element is assembled into a corrosion-resistant plastic frame; then, it is assembled into a metal outer frame; wherein the plastic frame and the metal outer frame are designed with matching grooves; during recycling and regeneration, the plastic frame is taken out from the non-corrosion-resistant aluminum profile frame. First, the metal outer frame of the present invention can be reused, avoiding waste. Second, after the regeneration liquid of the present invention is recycled three times, the service life still exceeds 650 min, which is 80% or more of the original resin.

Description

Technical Field

[0001] The invention relates to the field of recycling and reusing air purification equipment, in particular to a method for recycling and regenerating a regenerable ion resin filter. Background Art

[0002] As the line width of large-scale integrated circuit chips continues to narrow, many links in the chip production process need to be carried out in an environment with very high cleanliness requirements. The content of gaseous molecular contaminants (AMC) in electronic clean workshops affects industrial development and yield rate. Installing chemical filters is one of the important technical measures to control AMC in electronic workshops. AMC is mainly divided into four categories: 1. Acids; 2. Alkali; 3. Gaseous organic pollutants; 4. Dopants.

[0003] Anionic and cationic resins can effectively remove acid and alkaline gases in AMC. After the anionic and cationic resins fail, they must be treated by certain regeneration methods before they can be used. On the one hand, most of the current ion resin regeneration is carried out in the form of resin particles, and the filter frame cannot be reused, resulting in waste. Selecting a suitable method to make ion resin filter cloth to make it suitable for the regeneration environment requires the filter cloth to have a certain hardness and acid and alkali resistance, and the filter frame is required to be acid and alkali resistant and not easy to deform. At the same time, selecting a suitable method to regenerate the filter is an effective means to reduce resource waste. On the other hand, after the anionic and cationic resins are circulated through the regeneration liquid, the service life decreases rapidly after being recycled for 3 times. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a method for recycling and regenerating a regenerable ion resin filter, comprising the following steps:

[0005] S1, making filter cloth, further, making filter cloth by using glue-free process;

[0006] Ionic resin is added to the middle of the double-sided PP needle-punched cotton, and the resin is fixed in the middle of the PP needle-punched cotton by using fiber filaments through the needle-punching process. At the same time, the entire PP needle-punched cotton is sealed to form a filter cloth to prevent the resin from leaking out;

[0007] S2, assemble the filter

[0008] First, the filter element formed by the filter cloth is assembled into a corrosion-resistant frame to form a filter; then, the filter is assembled into a metal outer frame; the corrosion-resistant frame is detachably installed in the metal outer frame; further, the corrosion-resistant frame is a plastic frame, wherein the plastic frame and the metal outer frame are designed with matching grooves; when recycling, the plastic frame is taken out from the non-corrosion-resistant metal outer frame;

[0009] S3, filter recovery step

[0010] S31. After the filter is retrieved, remove the filter from the metal outer frame. If the outer frame is not deformed, place it flat directly on the regeneration equipment for regeneration.

[0011] S32. After the filter is retrieved, if the outer frame is deformed, tear open the filter element and put the recovered resin into the regeneration device for regeneration.

[0012] S4. Regeneration process of the renewable ion resin filter

[0013] S41. After the filter is placed flat, drip the acidic or alkaline regeneration liquid at a rate of 3 - 25 L / min. After the liquid level of the regeneration liquid covers the filter, while continuously dripping the regeneration liquid, discharge the regeneration liquid at the same flow rate to ensure that the regeneration liquid level always covers the filter. Stop the regeneration until all the regeneration liquid is consumed.

[0014] S42. Cleaning step: Rinse the regenerated filter with pure water at a flow rate of 10 - 50 L / min. After the liquid level exceeds the filter, discharge the waste water at the same flow rate. Stop rinsing when the pH value of the rinsing waste water reaches 6 - 8.

[0015] S43. Drying step: Dry the rinsed filter. Stop drying when the surface of the filter element is dry and the moisture content is 15 - 25%.

[0016] Furthermore, in step S1, the PP needle-punched cotton is a 100 - 300 gsm fabric non-woven fabric.

[0017] The ionizable resin is a gel-type ion exchange resin, or a macroporous ion exchange resin, or a strong acid cation resin, or a weak acid cation resin, or a strong base anion resin, or a weak base anion resin.

[0018] Furthermore, using the needle-punching process, the resin is fixed in the middle of the PP needle-punched cotton by fiber filaments. The prepared filter cloth has the following structural characteristics:

[0019] The filter cloth includes an upper layer of PP needle-punched cotton, a lower layer of PP needle-punched cotton, fiber filaments, and resin. The fiber filaments are respectively needle-connected to the upper layer of PP needle-punched cotton and the lower layer of PP needle-punched cotton. The fiber filaments form M (M≥2) longitudinal and / or N (N≥2) transverse fiber filament surfaces on the upper layer of PP needle-punched cotton and the lower layer of PP needle-punched cotton. M - 1, or N - 1, or (M - 1)*(N - 1) cavities are formed between the fiber filament surfaces, the upper layer of PP needle-punched cotton, and the lower layer of PP needle-punched cotton. The resin is arranged in the cavities.

[0020] Furthermore, in step S2, the material of the plastic frame is PP, or PS, or ABS; the material of the metal outer frame is aluminum profile, or aluminum sheet metal frame, or galvanized steel plate, or cold-rolled steel plate, or aluminized zinc.

[0021] Further, in step S2, the plastic frame and the filter element are filled into the grooves in the frame through a gluing process, and no liquid remains in the frame after taking out the self-regenerating liquid or pure water.

[0022] Further, in step S41, the acidic regenerating liquid is an aqueous solution of sulfuric acid, hydrochloric acid, phosphoric acid or nitric acid; the alkaline regenerating liquid is an aqueous solution of sodium hydroxide, ammonia water or potassium hydroxide.

[0023] Further, in step S41, the used and recycled failed ion exchange resin filter is regenerated with an alkaline solution or an acidic solution according to a volume ratio of 1:1 to 1:10, and the temperature of the regenerating liquid is 25-98 °C.

[0024] Further, in steps S41 and S42, the temperature of the regenerating liquid and pure water is 25-98 °C.

[0025] Further, in step S42, the filter in the cleaning step is rinsed with rinsing pure water according to a volume ratio of 1:3 to 1:10.

[0026] Further, in step S43, the drying temperature is 40-70 °C.

[0027] Beneficial effects: First, the present invention uses a non-glue process to manufacture the filter cloth. Ion resin is incorporated between double-sided PP needled cotton. Through the needling process, the resin is fixed in the middle of the PP needled cotton by fiber filaments, and at the same time, the entire filter cloth is edge-sealed to prevent the resin from leaking out. Second, when assembling the filter, first, the filter element is assembled into a corrosion-resistant plastic frame; then, it is assembled into a metal outer frame; the plastic frame and the metal outer frame are designed with matching grooves; during recycling and regeneration, the plastic frame is taken out from the non-corrosion-resistant aluminum profile frame; thus, from the filter element to the filter, it can be gradually disassembled, recycled and regenerated. The filter frame of the present invention can be reused, avoiding waste. Third, after the regenerating liquid of the present invention is recycled 3 times, the service life still exceeds 650 min, which is 80% of the original resin. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the needling process of the filter cloth;

[0029] Figure 2 It is a schematic diagram of the structure of the plastic frame of the filter; wherein, 5, protective mesh; 6, card comb; 7, sealant; 1, plastic frame;

[0030] Figure 3 It is a schematic diagram of the structure of the metal outer frame of the filter; wherein, 5, protective mesh; 6, card comb; 7, sealant; 8, metal outer frame and plastic inner frame;

[0031] Figure 4 It is a test result diagram of the service life of the cation resin filter prepared by the manufacturing process of the renewable ion resin filter of the present invention;

[0032] Figure 5 It is a diagram showing the test results of the service life of the anion resin filter prepared by the manufacturing process of the renewable ion resin filter of the present invention;

[0033] Figure 6 It is a diagram showing the service life results of the cation resin filter after being regenerated by recycling the regenerant of the present invention;

[0034] Figure 7 It is a schematic diagram of the assembly of the composite filter, where: 1. Plastic frame; 2. Filter element; 3. Gasket; 4. Metal outer frame. Specific implementation manners

[0035] A method for recycling and regenerating a renewable ion resin filter includes the following steps:

[0036] S1, making a filter cloth using a glue-free process;

[0037] Ionic resin is incorporated into the middle of double-sided PP needle-punched cotton, and the resin is fixed in the middle of the PP needle-punched cotton by using fiber filaments through a needle-punching process. At the same time, the entire filter cloth is edge-sealed to prevent the resin from leaking out;

[0038] By using fiber filaments through a needle-punching process to fix the resin in the middle of the PP needle-punched cotton, the produced filter cloth has the characteristics of being acid and alkali resistant, high temperature resistant, good water permeability, easy to recycle, high strength, and low resistance.

[0039] Furthermore, by fixing the ionic resin in the PP needle-punched cotton, the adsorption and treatment capacity of the filter material is increased. Using fiber filaments to fix the resin in the middle of the PP needle-punched cotton ensures the uniformity and stability of the resin distribution. The edge-sealing treatment further enhances the structural strength of the filter cloth and prevents the resin from leaking or flowing out. Since the resin is fixed in the needle-punched cotton, the resin is not easily lost during the regeneration process, ensuring the durability and regeneration efficiency of the filter. This structure helps the resin to maintain good filtering performance after multiple regenerations. By fixing the resin and performing edge-sealing treatment, the durability of the filter is improved and its service life is extended.

[0040] Furthermore, the PP needle-punched cotton is a 100 - 300 gsm fabric non-woven fabric, white or gray surface, thick, fluffy 1 - 5 mm. When in use, according to actual usage needs, the white and gray surfaces can be swapped arbitrarily, one white surface and one gray surface, or two white surfaces or two gray surfaces.

[0041] PP needled cotton, as a porous, lightweight and moderately thick non-woven fabric material, provides a good support and dispersion substrate for ion resins. The fabric weight range of 100 - 300 gsm enables the non-woven fabric to have a certain strength while maintaining good air permeability and filtration efficiency. As a core component of the filter, the stable fiber structure of PP needled cotton helps to fix the ion resins and prevent the resins from shifting or leaking during use. This stability is crucial for maintaining the long-term performance and regeneration ability of the filter. The porous structure of PP needled cotton helps to increase the contact area between the filter and the fluid, thus improving the filtration efficiency. At the same time, its relatively thick fabric can accommodate more ion resins, increasing the processing capacity of the filter.

[0042] During the regeneration process of the filter, PP needled cotton can help the resins to uniformly receive the treatment of the regeneration liquid, ensuring that the resins can be fully regenerated. Its good air permeability and liquid absorption capacity contribute to the uniform distribution and rapid penetration of the regeneration liquid in the resins. Due to the good durability and stability of PP needled cotton, it can withstand multiple regeneration processes without being easily damaged.

[0043] Furthermore, the ion resins can be classified into gel-type ion exchange resins or macroporous ion exchange resins according to their morphology, and into anion and cation resins according to acid-base properties: strongly basic anion resins, weakly basic anion resins, strongly acidic cation resins, or weakly acidic cation resins.

[0044] Furthermore, the renewable ion resin filter includes a cation resin filter and an anion resin filter;

[0045] Preferably, the cation exchange resin filter is regenerated using an acidic solution, and the anion exchange resin filter is regenerated using an alkaline solution.

[0046] Furthermore, the acidic regeneration liquid is an aqueous solution of sulfuric acid, hydrochloric acid, phosphoric acid or nitric acid, making the regeneration more comprehensive;

[0047] Regenerating cation exchange resin using acidic regeneration solutions such as sulfuric acid, hydrochloric acid, phosphoric acid or nitric acid aqueous solutions can efficiently remove impurities. These acidic regeneration solutions can effectively remove the impurities adsorbed on the cation exchange resin and restore its exchange capacity. In particular, sulfuric acid and hydrochloric acid, due to their strong acidity, can quickly replace the cations adsorbed on the resin, bringing the resin back to a state close to its original state. It can improve the exchange capacity. Using acidic regeneration solutions can significantly increase the exchange capacity of cation exchange resin. Through the regeneration treatment, the active groups of the resin are re-exposed, thus increasing the availability of its exchange sites. It can extend the service life of the resin. Regularly regenerating cation exchange resin with acidic regeneration solutions can significantly extend the service life of the resin. By removing the adsorbed impurities and restoring the exchange capacity, the resin can maintain high-efficiency performance for a longer time. It can improve the ammonia removal effect in the air. The cation exchange resin treated with acidic regeneration solutions can more effectively remove ammonia in the air, thus improving the treatment effect of alkaline pollutants in the air. This is particularly important for application fields that require high-quality clean air.

[0048] Furthermore, the alkaline regeneration solution is an aqueous solution of sodium hydroxide, ammonia water or potassium hydroxide, making the regeneration more comprehensive;

[0049] The alkaline regeneration solution of the present invention uses an aqueous solution of sodium hydroxide or potassium hydroxide and has high regeneration ability during the regeneration process of anion exchange resin. Sodium hydroxide and potassium hydroxide have strong alkalinity and can effectively replace the anions adsorbed on the anion exchange resin, thus achieving efficient regeneration of the resin. This high regeneration ability can quickly restore the exchange capacity of the resin and improve its working efficiency. It can remove both SO2 in the air and also remove organic substances and pigments. When using an alkaline regeneration solution containing sodium hydroxide, its strong alkaline environment helps dissolve and clean the acidic ions, organic substances and pigments adsorbed on the resin surface, thus further improving the regeneration effect and purity of the resin. This is particularly important for application fields that require high-purity products. It can extend the service life of the resin. Regularly regenerating anion exchange resin with an alkaline regeneration solution can effectively remove the pollutants on the resin and prevent it from clogging the resin pores or damaging the resin structure. This can not only maintain the high-efficiency performance of the resin, but also significantly extend the service life of the resin, reduce the replacement frequency and maintenance cost. It can improve the air treatment effect. After being treated with an alkaline regeneration solution, the anion exchange resin can more effectively remove acidic pollutants in the air, such as sulfur dioxide, etc., thus improving the air treatment effect. This is of great significance for the field of air purification. Compared with replacing new resin, it has environmental friendliness and sustainability. Using an alkaline regeneration solution for resin regeneration treatment can reduce waste generation and reduce the impact on the environment. This sustainable practice not only conforms to the environmental protection concept, but also helps enterprises achieve the goals of green production and sustainable development.

[0050] Furthermore, the resin is fixed in the middle of the PP needle punched cotton by using fiber filaments through a needle punching process, and the prepared filter cloth has the following structural characteristics:

[0051] As Figure 1 (filter cloth needle punching process) shown, the filter cloth includes an upper layer of PP needle punched cotton, a lower layer of PP needle punched cotton, fiber filaments, and resin.

[0052] The fiber filaments are respectively needle punched and connected to the upper layer of PP needle punched cotton and the lower layer of PP needle punched cotton. The fiber filaments form M (M≥2) longitudinal and / or N (N≥2) transverse fiber filament surfaces on the upper layer of PP needle punched cotton and the lower layer of PP needle punched cotton.

[0053] M-1, or N-1, or (M-1)*(N-1) cavities are formed between the fiber filament surface, the upper layer of PP needle punched cotton, and the lower layer of PP needle punched cotton, and the resin is arranged in the cavities.

[0054] The cavities formed between the upper layer of PP needle punched cotton and the lower layer of PP needle punched cotton by the fiber filament surface are used to arrange the resin in the cavities, so that the resin is firmly fixed in the cavities, thereby preventing the resin from scattering during the regeneration process and cleaning steps of the renewable ion resin filter.

[0055] In the present invention, fiber filaments form a fiber surface composed of fiber filaments between the upper layer of PP needle punched cotton and the lower layer of PP needle punched cotton. Gaps are formed between the fiber filaments, enabling better air permeability and water permeability between adjacent cavities. During the regeneration process of the renewable ion resin filter, each surface of the renewable ion resin can be fully wetted, and the renewable ion resin is regenerated more completely. During the cleaning step, each surface of the renewable ion resin can be more thoroughly cleaned, reducing or avoiding the residual regeneration liquid on the surface of the renewable ion resin.

[0056] S2. Assemble the filter

[0057] As Figure 7 shown, first, assemble the filter element into a corrosion-resistant plastic frame; then, assemble it into a metal outer frame. The plastic frame and the metal outer frame are designed with matching grooves; during recycling and regeneration, remove the plastic frame from the non-corrosion-resistant metal outer frame.

[0058] Furthermore, the material of the plastic frame is: PP, or PS, or ABS.

[0059] The material of the metal outer frame is: aluminum profile, or aluminum sheet metal frame, or galvanized steel plate, or cold-rolled steel plate, or aluminized zinc.

[0060] If only a plastic frame is used, although it is corrosion-resistant, its structure is poor; in the present invention, a metal outer frame is also provided outside the plastic frame, improving the overall strength of the filter.

[0061] The plastic frame and the metal outer frame of the present invention are designed with matching grooves. On the one hand, glue and connectors are not required. On the other hand, the plastic frame can be easily removed from the metal outer frame.

[0062] Further, as Figure 2 (filter plastic frame), Figure 3 (metal outer frame) shows, the plastic frame and the filter element fill the grooves in the frame through a gluing process, and no liquid remains in the frame after taking out the self-regenerating liquid or pure water.

[0063] S3, recycling step:

[0064] S31, after the filter is retrieved, if the outer frame has not been deformed, it is directly placed in the regeneration equipment for regeneration;

[0065] S32, after the filter is retrieved, if the outer frame is deformed, remove the plastic frame, tear off the needle-punched cotton, and put the recycled resin into the regeneration device for regeneration.

[0066] S4, the regeneration process of the renewable ion resin filter

[0067] S41, lay the filter flat and drip the acidic or alkaline regeneration liquid at a rate of 3 - 25 L / min. After the regeneration liquid level covers the filter, continue to drip the regeneration liquid and discharge the regeneration liquid at the same flow rate to ensure that the regeneration liquid level always covers the filter until all the regeneration liquid is consumed, and then stop the regeneration;

[0068] Dripping the regeneration liquid continuously at a rate of 3 - 25 L / min can ensure that the regeneration liquid flows evenly through every part of the filter, thus achieving a uniform and efficient regeneration effect. This continuous flow avoids local accumulation of the regeneration liquid in the filter, ensures uniform treatment of the entire filter, and achieves a uniform and efficient regeneration effect.

[0069] Continuously dripping and discharging the regeneration liquid at a flow rate of 3 - 25 L / min can accelerate the chemical reaction rate during the regeneration process, thereby shortening the total regeneration time required. This dynamic regeneration method is more efficient than static soaking, can quickly restore the performance of the filter, and achieves the effects of reducing the regeneration time and improving the regeneration efficiency.

[0070] By regenerating in a continuous flow manner, it can effectively prevent the ion resin pores in the filter from being blocked by other impurities again during the regeneration process. The continuous flow of the regeneration liquid helps to remove impurities in the ion resin of the filter and maintain the permeability of the filter.

[0071] Uniform regeneration treatment can maximize the restoration of the filter's performance, thereby extending its service life. By keeping the regeneration liquid level always covering the filter, it can ensure that every part of the filter is fully regenerated, effectively improving the regeneration rate.

[0072] Continuously dripping and discharging the regeneration liquid at a certain flow rate can ensure the full utilization of the regeneration liquid. This method avoids the waste of the regeneration liquid, improves the utilization efficiency of the regeneration liquid, and at the same time reduces the cost and environmental burden of treating waste liquid.

[0073] Through uniform regeneration treatment, the structure and performance of the filter can be more stable. This stability can not only improve the use effect of the filter, but also reduce the frequency and cost of maintenance.

[0074] Furthermore, the regeneration liquid is recycled more than 2 times to save the regeneration liquid.

[0075] On the one hand, by recycling the regeneration liquid, the consumption of fresh regeneration liquid can be reduced, thereby improving the utilization efficiency of resources. This can not only reduce production costs, but also help reduce the impact on the environment and achieve a more environmentally friendly production method. On the other hand, recycling the regeneration liquid may enable the resin to have more sufficient contact and reaction time with the ions in the regeneration liquid, thereby enhancing the regeneration effect. Recycling the regeneration liquid multiple times helps to more thoroughly elute the ions and impurities adsorbed on the resin, and restore the resin to a performance closer to its original state. Thirdly, recycling the regeneration liquid helps to stabilize the chemical environment during the regeneration process, because the chemical components in the regeneration liquid may reach a dynamic balance during multiple cycles. This stability is conducive to improving the controllability and consistency of the regeneration process, thereby ensuring that each regeneration can achieve the expected effect.

[0076] Furthermore, the used and recycled failed ion exchange resin filter is regenerated with an alkaline solution or an acidic solution at a volume ratio of 1:1 to 1:5;

[0077] S42, the cleaning step: rinse the regenerated filter with pure water at a flow rate of 10 - 50 L / min. After the liquid level exceeds the filter, discharge the waste water at the same flow rate. Stop rinsing when the pH value of the rinsing waste water reaches 6 - 8.

[0078] Rinsing the regenerated ion exchange resin filter with the specific cleaning steps and cleaning parameters of the present invention can thoroughly remove the residual regenerant. Rinsing with pure water at a flow rate of 10 - 50 L / min can ensure that the alkaline or acidic regenerant used in the regeneration process is thoroughly removed. This helps to prevent the regenerant from dripping acid / alkali liquid in a high humidity environment and optimize the use environment. The rinsing end point pH value is 6 - 8 to ensure that the resin is neutral and non-corrosive. Through sufficient rinsing, it can be ensured that the voids and surfaces inside the resin are thoroughly cleaned, so that ions can be adsorbed and released more quickly during the next regeneration, improving the regeneration efficiency. It can extend the service life of the resin. Regular and correct rinsing operations can reduce the damage to the resin caused by residues or improper handling, thereby extending its service life.

[0079] Preferably, the temperature of the regeneration liquid is 25-98°C to make the regeneration more comprehensive;

[0080] Regenerating the ion resin at a relatively high temperature can effectively accelerate the reaction rate and shorten the regeneration time.

[0081] Preferably, the temperature of the pure water is 25-98°C to make the cleaning more comprehensive;

[0082] In the present invention, during the process of cleaning and regenerating the ion exchange resin filter, pure water at 25-98°C is used for rinsing, achieving a series of unexpected technical effects. First, it can enhance the cleaning effect. Within this temperature range, the dissolution ability and fluidity of pure water are optimized, and it can more effectively remove pollutants on the surface and inside of the resin. High-temperature water helps soften and dissolve stubborn dirt, thereby improving the thoroughness of cleaning. Second, it can promote resin regeneration. An appropriate temperature can accelerate the ion exchange process inside the resin, enabling the resin to return to the optimal working state faster. This helps improve the regeneration efficiency of the resin and shorten the regeneration cycle. Third, it can extend the resin life. Regularly rinsing with pure water at an appropriate temperature can reduce the performance degradation of the resin caused by dirt accumulation, thereby extending its service life. This reduces the cost of frequent resin replacement and the risk of operation interruption. Fourth, it can improve the stability of the filter system. The pollutants and impurities removed during the cleaning process reduce the blockage and wear inside the filter system, helping to maintain the stable operation of the ion exchange system. This reduces the probability of filter system failure and improves the overall reliability.

[0083] Preferably, the filter in the cleaning step and the rinsing pure water are rinsed according to a volume ratio of 1:3 to 1:10 to ensure that the pH of the water reaches neutral after rinsing;

[0084] S43, the drying step: Dry the cleaned and regenerated ion resin filter, and stop drying when the surface of the filter element is dry and the moisture content is 15-25%.

[0085] By controlling the moisture content of the resin within the range of 15-25% in the present invention, on the one hand, it is used to prevent the resin from becoming brittle due to excessive drying or its performance from degrading due to excessive moisture. This helps maintain the activity of the resin, extend its service life, and reduce the replacement frequency.

[0086] On the other hand, by controlling the moisture content of the resin within the range of 15-25%, the appropriate moisture content helps maintain the stability of the resin structure and prevent its performance from changing due to environmental changes (such as temperature and humidity fluctuations). This will ensure that the resin can maintain consistent performance under various environmental conditions.

[0087] Preferably, the drying temperature is 40-70°C to ensure that the ions in the resin do not precipitate;

[0088] On the one hand, the present invention is dried within the temperature range of 40 - 70 °C, which helps to fine-tune and optimize the internal structure of the resin. This temperature range is relatively mild and can avoid the destruction of the resin structure that may be caused by high temperature, thus maintaining the integrity and performance of the resin.

[0089] On the other hand, the lower drying temperature can prevent the resin from undergoing thermal degradation. High temperature may cause the resin to decompose, producing harmful substances and affecting the quality and performance of the resin. The temperature range of 40 - 70 °C can effectively avoid this situation.

[0090] Thirdly, the appropriate drying temperature can maintain the activity of the resin and avoid the inactivation of the resin caused by too high temperature. Drying at a temperature of 40 - 70 °C can ensure that the resin maintains its ion exchange capacity during the regeneration process.

[0091] As Figure 4 shown, the service life of the cation resin filter prepared by the method for recycling and regenerating the renewable ion resin filter of the present invention was detected. For the cation resin filter, when the filter efficiency decreased from 100% to 70%, the service life of the filter was detected, and the test results are as follows:

[0092] For the original resin, when the filter efficiency decreased from 100% to 70%, the filter life was 1000 - 1100 min;

[0093] When regenerated once, when the filter efficiency decreased from 95 - 100% to 70%, the filter life was 900 - 1000 min;

[0094] When regenerated 5 times, when the filter efficiency decreased from 95 - 100% to 70%, the filter life was 800 - 900 min;

[0095] Thus, it can be seen that for the cation resin filter prepared by the method for recycling and regenerating the renewable ion resin filter of the present invention, within five regenerations, the initial efficiency of the regenerated filter > 97%, and the life can maintain 85% of the original resin.

[0096] As Figure 5 shown, the service life of the anion resin filter prepared by the method for recycling and regenerating the renewable ion resin filter of the present invention was detected. For the anion resin filter, when the filter efficiency decreased from 100% to 70%, the service life of the filter was detected, and the test results are as follows:

[0097] For the original resin, when the filter efficiency decreased from 100% to 70%, the filter life was 600 - 700 min;

[0098] When regenerated once, when the filter efficiency decreased from 95 - 100% to 70%, the filter life was 500 - 600 min;

[0099] When regenerated 5 times, when the filter efficiency decreases from 95 - 100% to 70%, the filter life is 400 - 500 min;

[0100] When regenerated 7 times, when the filter efficiency decreases from 95 - 100% to 70%, the filter life is 300 - 400 min;

[0101] It can be seen that the anion resin filter prepared by the method for recycling and regenerating the renewable ion resin filter of the present invention has an initial efficiency of the regenerated filter > 97% within five regenerations, and the life can maintain 85% of the original resin.

[0102] Such as Figure 6 shown, the number of cycles of the regeneration liquid of the cation resin filter prepared by the method for recycling and regenerating the renewable ion resin filter of the present invention is detected. After the regeneration liquid is recycled 3 times, the service life still exceeds 650 min, which is more than 80% of the original resin, and a good use effect can be maintained.

[0103] Furthermore, as Figure 7 shown, the filter includes a metal outer frame 4, a plastic frame 1, a gasket 3 and a filter element 2. Both ends of the filter element 2 are installed in the plastic frame 1, and the plastic frame 1 is arranged in the metal outer frame 4 and connected by the gasket 3. The plastic frame 1 and the metal outer frame 4 are designed with matching grooves, and the grooves of the plastic frame 1 and the metal outer frame 4 are connected by plugging.

Claims

1. A method for recycling and regenerating a renewable ion resin filter, characterized in that It includes the following steps: S1. Making the filter cloth Ionic resin is incorporated into the middle of double-sided PP needle-punched cotton. Through the needle-punching process, the resin is fixed in the middle of the PP needle-punched cotton by fiber filaments. At the same time, the entire PP needle-punched cotton is edge-sealed to form the filter cloth. The prepared filter cloth has the following structural characteristics: The filter cloth includes an upper-layer PP needle-punched cotton, a lower-layer PP needle-punched cotton, fiber filaments, and resin; the fiber filaments are respectively needle-connected to the upper-layer PP needle-punched cotton and the lower-layer PP needle-punched cotton. The fiber filaments form M longitudinal and / or N transverse fiber filament surfaces on the upper-layer PP needle-punched cotton and the lower-layer PP needle-punched cotton, N≥2, M≥2; M-1, or N-1, or (M-1)*(N-1) cavities are formed between the fiber filament surfaces, the upper-layer PP needle-punched cotton, and the lower-layer PP needle-punched cotton, and the resin is arranged in the cavities; gaps are formed between the fiber filaments on the fiber filament surfaces; S2. Assembling the filter First, the filter element formed by the above filter cloth is assembled into a corrosion-resistant frame to form a filter; then, the filter is assembled into a metal outer frame; wherein the corrosion-resistant frame is detachably installed in the metal outer frame; The corrosion-resistant frame is a plastic frame, and both ends of the filter element made in step S1 are installed in the plastic frame; The filter includes the filter element made in step S1 and a plastic frame; The plastic frame is arranged in the metal outer frame and is connected by a sealing gasket. The plastic frame and the metal outer frame are provided with matching grooves, and the plastic frame and the metal outer frame are connected by inserting the grooves; S3. Filter recycling step S31. Taking the filter out of the metal outer frame; S32. If the filter does not deform, it is directly placed flat in the regeneration equipment for regeneration; S32. If the filter deforms, the filter element is torn open, and the recycled resin is put into the regeneration device for regeneration; S4. Filter regeneration process S41. Regeneration steps: The regeneration equipment drops the acidic or alkaline regeneration liquid at a rate of 3-25 L / min. After the regeneration liquid level submerges the filter, while continuing to drop the regeneration liquid, the regeneration liquid is discharged at the same flow rate to ensure that the regeneration liquid level always submerges the filter. After all the regeneration liquid is consumed, the regeneration is stopped; S42. Cleaning steps: The regenerated filter is rinsed with pure water at a flow rate of 10-50 L / min. After the liquid level exceeds the filter, the waste water is discharged at the same flow rate. The rinsing is stopped when the pH value of the rinsing waste water reaches 6-8; S43. Drying steps: The rinsed filter is dried, and the drying is stopped when the surface of the filter element is dry and the moisture content is 15-25%; 2. The method for recycling and regenerating the renewable ion resin filter according to claim 1, wherein: In step S1, the PP needle-punched cotton is a 100-300 gsm fabric non-woven fabric; The ionic resin is a gel-type ion exchange resin, or a macroporous ion exchange resin, or a strong acid cation resin, or a weak acid cation resin, or a strong base anion resin, or a weak base anion resin; the cation exchange resin filter is regenerated using an acidic solution, and the anion exchange resin filter is regenerated using an alkaline solution.

3. The method for recycling and regenerating the renewable ion resin filter according to claim 1, wherein: In step S2, the material of the corrosion-resistant frame is PP, or PS, or ABS; the material of the metal outer frame is aluminum profile, or aluminum alloy frame, or galvanized steel plate, or cold-rolled steel plate, or aluminized zinc.

4. The method for recycling and regeneration of the renewable ion resin filter according to claim 1, characterized in that: In step S2, the filter element and the corrosion-resistant frame are filled with glue into the grooves in the frame, so that there is no liquid remaining in the frame after the regeneration of the filter.

5. The method for recycling and regenerating the renewable ion resin filter according to claim 1, characterized in that: In step S41, the acidic regeneration liquid is an aqueous solution of sulfuric acid, hydrochloric acid, phosphoric acid or nitric acid; the alkaline regeneration liquid is an aqueous solution of sodium hydroxide, ammonia water or potassium hydroxide.

6. The method for recycling and regenerating the renewable ion resin filter according to claim 1, characterized in that: In step S41, the used and recycled filter is regenerated with an alkaline solution or an acidic solution at a volume ratio of 1:1 to 1:

10.

7. The method for recycling and regeneration of the renewable ion resin filter according to claim 1, characterized in that: In step S42, the filter in the cleaning step is rinsed with pure water for rinsing at a volume ratio of 1:3 to 1:

10.

8. The method for recycling and regeneration of the renewable ion resin filter according to claim 1, characterized in that: In steps S41 and S42, the temperature of the regeneration liquid and pure water is 25-98°C.

9. The method for recycling and regenerating the renewable ion resin filter according to claim 1, characterized in that: In step S43, the drying temperature is 40-70°C; In steps S41 and S42, the regeneration liquid and pure water can be recycled more than 2 times.

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