Off-line cleaning device and cleaning method for reverse osmosis membrane for copper foil production water treatment

Abstract

The problems that an existing reverse osmosis membrane cleaning device needs to consume a large amount of water in the cleaning process, and water is wasted are solved. The invention provides a reverse osmosis membrane off-line cleaning device for copper foil production water treatment and a cleaning method. The principle of a reverse osmosis membrane is utilized, cleaning water is distinguished according to concentrated water and fresh water and is recycled, and water resources consumed in the cleaning process are reduced; in addition, the first tank and the second tank are arranged and matched with a circulating port, so that the liquid medicine is circularly prepared, the problem of non-uniform stirring and mixing in the traditional process is avoided, a first pump used when the reverse osmosis module is cleaned is fully utilized, the liquid medicine is mixed and circulated, and the equipment cost is also reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of reverse osmosis membrane cleaning, in particular to an off-line reverse osmosis membrane cleaning device and a cleaning method for copper foil production water treatment. Background Art

[0002] During the production of electrolytic copper foil, pure water is required to rinse the copper foil surface to prevent residual plating solution. This process consumes a large amount of pure water. To effectively utilize water resources, reverse osmosis membranes are often used in the copper foil production process to treat the recycled rinse water, generating pure water for reuse in production.

[0003] After long-term use, reverse osmosis membranes can deposit organic matter, dirt, and other pollutants on their filter surfaces, affecting their filtration performance. Therefore, they need to be regularly cleaned, as described in Patent Publication No. CN114288865B. However, existing reverse osmosis membrane cleaning systems typically utilize acid-base solution circulation and immersion cleaning, combined with clean water rinsing. This process consumes a significant amount of water, resulting in unnecessary waste. Therefore, a need exists for an off-line cleaning device and method for reverse osmosis membranes used in copper foil production water treatment that achieves effective cleaning results while reducing water waste. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies of the prior art and to provide a reverse osmosis membrane offline cleaning device and a cleaning method for copper foil production water treatment.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions: A reverse osmosis membrane offline cleaning device for copper foil production water treatment includes a No. 1 tank, a No. 2 tank, a No. 3 tank, a No. 1 pump, a No. 2 pump, and a reverse osmosis module; wherein the No. 1 tank is used to store alkaline cleaning liquid, the No. 2 tank is used to store acidic cleaning liquid, and the No. 3 tank is used to store pure water cleaning liquid; the top of the No. 1 tank is respectively provided with four liquid inlets, namely, a No. 1 concentrated water inlet, a No. 1 pure water inlet, a No. 1 fresh water inlet, and a No. 1 circulation inlet; the bottom of the No. 1 tank is provided with a No. 1 water outlet; the top of the No. 2 tank is respectively provided with a No. 2 concentrated water inlet, a No. 2 pure water inlet, a No. 2 fresh water inlet, and a No. 2 circulation inlet; the bottom of the No. 2 tank is provided with a No. 2 water outlet; the top of the No. 3 tank is respectively provided with a No. 3 pure water inlet and a No. 3 fresh water inlet , a No. 3 water outlet is provided at the bottom of the No. 3 tank; the water inlet of the reverse osmosis module is connected to the No. 1 concentrated water inlet and the No. 2 concentrated water inlet through the concentrated water main pipe, and the water outlet of the reverse osmosis module is connected to the No. 1 fresh water inlet, the No. 2 fresh water inlet and the No. 3 fresh water inlet through the fresh water main pipe; the No. 1 pure water inlet, the No. 2 pure water inlet and the No. 3 pure water inlet are all connected to the external pure water supply equipment; the No. 1 water outlet and the No. 2 water outlet are respectively connected to the water inlet of the No. 1 pump, and the water outlet of the No. 1 pump is respectively connected to the No. 1 circulation port, the No. 2 circulation port and the water inlet of the reverse osmosis module; the No. 3 water outlet is connected to the water inlet of the No. 2 pump, and the water outlet of the No. 2 pump is respectively connected to the No. 1 circulation port, the No. 2 circulation port and the water inlet of the reverse osmosis module.

[0006] Furthermore, it also includes a filter, which is arranged between the water inlet end of the reverse osmosis module and the first tank, and between the water inlet end of the reverse osmosis module and the second tank.

[0007] Furthermore, the top of the No. 1 tank is respectively provided with valve No. 1, valve No. 2, valve No. 3 and valve No. 4 corresponding to its No. 1 concentrated water inlet, No. 1 pure water inlet, No. 1 fresh water inlet and No. 1 circulation inlet; the top of the No. 2 tank is respectively provided with valve No. 5, valve No. 6, valve No. 7 and valve No. 8 corresponding to its No. 2 concentrated water inlet, No. 2 pure water inlet, No. 2 fresh water inlet and No. 2 circulation inlet.

[0008] Furthermore, a No. 9 valve serving as a main circulation valve is provided between the No. 1 pump and the No. 1 circulation port and the No. 2 circulation port; the No. 9 valve is located on the common pipeline between the No. 1 circulation port, the No. 2 circulation port and the No. 1 pump.

[0009] Furthermore, a No. 10 valve for controlling the liquid discharge from the No. 1 tank is provided between the No. 1 tank and the No. 1 pump; and a No. 11 valve for controlling the liquid discharge from the No. 2 tank is provided between the No. 2 tank and the No. 1 pump.

[0010] Furthermore, the top of the No. 3 tank is provided with valve No. 11 and valve No. 12 corresponding to the No. 3 pure water inlet and the No. 3 fresh water inlet; the bottom of the No. 3 tank is provided with valve No. 13, and the No. 13 valve is located between the No. 3 tank and the No. 2 pump; the water outlet of the No. 2 pump is also provided with valve No. 14.

[0011] Furthermore, a valve No. 15 is provided between the No. 1 pump and the filter for controlling the flow of liquid from the No. 1 tank and the No. 2 tank into the filter; a valve No. 16 is also provided between the filter and the water inlet end of the reverse osmosis module, and the valve No. 16 is used to control the on-off of the pipeline between the filter and the reverse osmosis module.

[0012] Furthermore, the No. 1 water outlet of the No. 1 tank and the No. 2 water outlet of the No. 2 tank are both connected to the liquid outlet pipe, and a valve is provided on the liquid outlet pipe.

[0013] An off-line cleaning method for a reverse osmosis membrane used for copper foil production water treatment is provided, based on the above-mentioned cleaning device, and the cleaning method comprises the following steps: Step 1: Connect the reverse osmosis membrane to be cleaned to the reverse osmosis module; Step 2: Alkaline cleaning preparation, including adding alkaline cleaning solution of a set concentration and volume to tank No. 1, then starting valve No. 2, filling a certain amount of pure water into tank No. 1 and closing it; opening valves No. 9, No. 10, and No. 4, and starting pump No. 1 to control the circulation and mixing of alkaline cleaning solution and pure water in the pipeline; Step 3: Perform alkaline cleaning, including shutting down pump No. 1, closing valves No. 9 and No. 4, and opening valves No. 15, No. 16, No. 1, and No. 3; then starting pump No. 1 to pass the mixed alkaline cleaning solution in tank No. 1 into the reverse osmosis module to complete the circulation. After the set time, stop pump No. 1 and soak for the set time; then proceed to the next step or proceed to the next step after the set number of cycles; Step 4: Open the valve on the outlet pipe of tank No. 1 to drain tank No. 1; Step 5: Open valve No. 11 of tank No. 3, add pure water to tank No. 3, and close it after the addition is completed; Step 6: Cleaning is performed, including opening valves No. 12, No. 13, and No. 14, and opening valve No. 1, and then starting pump No. 2 until the pH value of the liquid in tank No. 3 stabilizes to the set value, and the cleaning is completed; Step 7: Pickling preparation, including starting valve No. 6, filling a certain amount of pure water into tank No. 2 and then closing it, then adding an acid cleaning solution of a set concentration and volume into tank No. 2; opening valves No. 9, No. 11, and No. 8, and starting pump No. 1 to control the acid cleaning solution and pure water to complete the liquid circulation and mixing in the pipeline; Step 8: Perform acid cleaning, including shutting down pump No. 1, closing valves No. 9 and No. 8, and opening valves No. 15, No. 16, No. 5, and No. 7; then starting pump No. 1 to pass the mixed acid cleaning solution in tank No. 2 into the reverse osmosis module to complete the circulation. After the set time, stop pump No. 1 and soak for the set time; then proceed to the next step or proceed to the next step after the set number of cycles; Step 9: Open the valve on the outlet pipe of tank No. 2 to drain tank No. 2; Step 10: Open valve No. 11 of tank No. 3, add pure water to tank No. 3, and close it after the addition is completed; Step 11: Cleaning is performed, including opening valves No. 12, No. 13, and No. 14, and opening valve No. 1, and then starting pump No. 2 until the pH value of the liquid in tank No. 3 stabilizes to the set value, and the cleaning is completed; Step 12: Complete the cleaning, drain the liquid in tanks 1, 2, and 3, remove the reverse osmosis membrane, and end the step.

[0014] Furthermore, in step 6 and step 11, valve No. 11 of tank No. 3 is repeatedly opened and closed according to the liquid level in the tank, so as to control the liquid level in tank No. 3 to be stable during the cleaning process.

[0015] The beneficial effects of the present invention are: By utilizing the principle of reverse osmosis membrane, the cleaning water is separated into concentrated water and fresh water, and recycled, thus reducing the water consumption in the cleaning process; By setting up tanks No. 1 and No. 2, and coordinating circulation ports No. 1 and No. 2, the chemical solution can be circulated, avoiding the problem of uneven mixing in traditional processes. The No. 1 pump used for cleaning the reverse osmosis module is fully utilized to complete the chemical solution mixing circulation, which also reduces equipment costs. By adopting the cleaning method, the reverse osmosis membrane is automatically cleaned, and the liquid in the cleaning process is recycled to reduce water waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of Example 1; Figure 2 This is a schematic diagram of the pressure detection structure of Example 1.

[0017] Illustrations: Tank 1, Concentrate Inlet 101, Pure Water Inlet 102, Fresh Water Inlet 103, Circulation Inlet 104, Water Outlet 105, Tank 2, Concentrate Inlet 201, Pure Water Inlet 202, Fresh Water Inlet 203, Circulation Inlet 204, Water Outlet 205, Tank 3, Pure Water Inlet 301, Fresh Water Inlet 302, Water Outlet 303, Reverse Osmosis Module 4, Valve 1 5. Valve No. 2 6. Valve No. 3 7. Valve No. 4 8. Valve No. 5 9. Valve No. 6 10. Valve No. 7 11. Valve No. 8 12. Valve No. 9 13. Valve No. 10 14. Valve No. 11 15. Valve No. 12 16. Valve No. 13 17. Valve No. 14 18. Valve No. 15 19. Valve No. 16 20. Pressure detection structure 21. Pressure gauge 211. T-tube 212. Pump No. 1 22. Pump No. 2 23. Filter 24. DETAILED DESCRIPTION

[0018] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. Therefore, the figures only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0020] Example 1: like Figure 1 and Figure 2As shown, a reverse osmosis membrane offline cleaning device for copper foil production water treatment includes a No. 1 tank 1, a No. 2 tank 2, a No. 3 tank 3, a No. 1 pump 22, a No. 2 pump 23 and a reverse osmosis module 4; wherein the No. 1 tank 1 is used to store alkaline cleaning liquid, the No. 2 tank 2 is used to store acidic cleaning liquid, and the No. 3 tank 3 is used to store pure water cleaning liquid. In this example, the alkaline cleaning liquid is a 30% concentration sodium hydroxide solution, and the acidic cleaning liquid is a 1% concentration hydrochloric acid solution; the top of the No. 1 tank There are four liquid inlets, namely the No. 1 concentrated water inlet 101, the No. 1 pure water inlet 102, the No. 1 fresh water inlet 103 and the No. 1 circulation inlet 104. The bottom of the No. 1 tank 1 is provided with a No. 1 water outlet 105; the top of the No. 2 tank 2 is provided with a No. 2 concentrated water inlet 201, the No. 2 pure water inlet 202, the No. 2 fresh water inlet 203 and the No. 2 circulation inlet 204, and the bottom of the No. 2 tank 2 is provided with a No. 2 water outlet 205; the top of the No. 3 tank 3 is provided with three The No. 1 pure water inlet 301 and the No. 3 fresh water inlet 302 are connected, and the No. 3 water outlet 303 is provided at the bottom of the No. 3 tank 3; the water inlet of the reverse osmosis module 4 is connected to the No. 1 concentrated water inlet 101 and the No. 2 concentrated water inlet 201 through the concentrated water main pipe, and the water outlet of the reverse osmosis module 4 is connected to the No. 1 fresh water inlet 103, the No. 2 fresh water inlet 203 and the No. 3 fresh water inlet 302 through the fresh water main pipe; the No. 1 pure water inlet 102, the No. 2 pure water inlet 202 and the No. 3 pure water inlet 301 are all connected to the outside The first water outlet 105 and the second water outlet 205 are connected to the water inlet of the first pump 22 respectively, and the water outlet of the first pump 22 is connected to the water inlet of the first circulation port 104, the second circulation port 204 and the water inlet of the reverse osmosis module 4 respectively; the third water outlet 303 is connected to the water inlet of the second pump 23, and the water outlet of the second pump 23 is connected to the water inlet of the first circulation port 104, the second circulation port 204 and the water inlet of the reverse osmosis module 4 respectively. By setting the connection relationship between the first tank 1 and the second tank 2 and the reverse osmosis module 4, on the one hand, it is convenient to realize the circulation and mixing of the cleaning liquid in the pipeline, ensuring that the alkaline or acidic cleaning liquid can maintain a uniform texture, and having a better cleaning effect on the reverse osmosis membrane. In this example, the reverse osmosis module 4 includes several structures connected to the reverse osmosis membrane, and after the reverse osmosis membrane is connected, the cleaning process can be completed. It should be noted that since there will be impurities attached to both sides of the reverse osmosis membrane group, and some impurities are difficult to pass through the reverse osmosis membrane, a concentrated water main pipe connected to tank No. 1 and tank No. 2 is provided at the water inlet end of the reverse osmosis module 4, which is used to transport the impurities stripped by the acid and alkali cleaning liquid to tank No. 1 and tank No. 2 for easy discharge.

[0021] Tank No. 1, Tank No. 2, and Tank No. 3 are respectively equipped with a liquid level gauge, a thermometer, a pH meter, and a heating device. The liquid level gauge is used to detect the liquid level in the tank. On the one hand, it is convenient to control the draining of the cleaning liquid in the tank after cleaning, and on the other hand, it controls the liquid level in the tank to remain stable during the cleaning process. The heating device is used to heat the cleaning liquid in the tank and, in conjunction with the thermometer, controls the cleaning liquid in the tank to remain stable within a certain temperature range to ensure a good cleaning effect. The temperature range of the cleaning liquid is usually controlled to be 30°C~40°C. The pH meter is used to detect the pH value of the cleaning liquid when mixing the acidic cleaning liquid and the alkaline cleaning liquid, and to start cleaning the reverse osmosis membrane when the required pH value is reached. In this example, the volumes of Tank No. 1, Tank No. 2, and Tank No. 3 are all 1250L.

[0022] It also includes a filter 24, which is arranged between the water inlet end of the reverse osmosis module 4 and tank No. 1, and between the water inlet end of the reverse osmosis module 4 and tank No. 2 2; the filter 24 is used to filter impurities cleaned from the reverse osmosis module 4 to prevent them from re-adhering to the reverse osmosis module 4; in this example, at least two filter 24 pipelines are provided, so that when one of the filters 24 is blocked, the other filter 24 pipelines can still complete the filtering work normally.

[0023] The top of the No. 1 tank 1 is provided with valves 1, 2, 3, 7, and 4, corresponding to its No. 1 concentrated water inlet 101, No. 1 pure water inlet 102, No. 1 fresh water inlet 103, and No. 1 circulation inlet 104. The top of the No. 2 tank 2 is provided with valves 5, 6, 7, 11, and 8, corresponding to its No. 2 concentrated water inlet 201, No. 2 pure water inlet 202, No. 2 fresh water inlet 203, and No. 2 circulation inlet 204. A valve 9, serving as the main circulation valve, is also provided between the No. 1 pump 22 and the No. 1 and No. 2 circulation inlets 104 and 204. Valve 9, located on the common pipeline between the No. 1 and No. 2 circulation inlets 104 and 204 and the No. 1 pump 22, controls whether the No. 1 and No. 2 circulation inlets 104 and 204 participate in the circulation of the mixed cleaning solution. Between tank 1 and pump 22, valve 10 is installed to control the liquid discharge from tank 1. Valve 11 is installed between tank 2 and pump 22 to control the liquid discharge from tank 2. It should be noted that valves 10 and 11, respectively, control the liquid discharge from tanks 1 and 2. Valve 11 and valve 16, corresponding to pure water inlet 301 and fresh water inlet 302, are installed at the top of tank 3. Valve 13 is installed at the bottom of tank 3, located between tank 3 and pump 23. Valve 14 is also installed at the outlet of pump 23. A valve No. 15 is provided between pump No. 1 22 and filter 24 for controlling the flow of liquid from tank No. 1 and tank No. 2 into filter 24 ; a valve No. 16 is also provided between filter 24 and the water inlet end of reverse osmosis module 4 , and valve No. 16 is used to control the on-off of the pipeline between filter 24 and reverse osmosis module 4 .

[0024] The No. 1 water outlet 105 of the No. 1 tank 1 and the No. 2 water outlet 205 of the No. 2 tank 2 are both connected to the liquid outlet pipe, and valves are provided on the liquid outlet pipe for cooperating with the No. 10 valve 14 of the No. 1 tank 1 and the No. 11 valve 15 of the No. 2 tank 2 to discharge the liquid in the No. 1 tank 1 and the No. 2 tank 2.

[0025] The liquid outlet of pump No. 1 22 is also provided with a pressure detection structure 21, which includes a pressure gauge 211, a T-tube 212, and two valves. One end of the T-tube 212 is connected to the water outlet of pump No. 1 22, and the other end of the T-tube 212 is connected to the pressure gauge 211. The last end of the T-tube 212 is provided as a pressure relief port. The two valves are respectively provided near the pressure relief port and the pressure gauge 211. The pressure detection structure 21 can detect the water pressure at the water outlet of pump No. 1 22 in real time. When abnormal water pressure occurs, the pressure can be relieved in time or the power of pump No. 1 22 can be increased to ensure the subsequent flushing effect of the reverse osmosis module 4.

[0026] An off-line cleaning method for a reverse osmosis membrane used for copper foil production water treatment is provided, based on the above-mentioned cleaning device, and the cleaning method comprises the following steps: Step 1: Connect the reverse osmosis membrane to be cleaned to the reverse osmosis module 4; Step 2: Alkaline cleaning preparation, including adding 5L of 30% sodium hydroxide alkaline cleaning solution to tank 1, then starting valve 6, filling tank 1 with pure water accounting for about 80% of the volume of tank 1, and then closing it; opening valve 9 13, valve 10 14 and valve 4 8, and starting pump 1 22 to control the circulation of alkaline cleaning solution and pure water in the pipeline; controlling the hydraulic pressure and flow rate through the pressure detection structure 21, so that the liquid mixing circulates for 30 minutes; Step 3: Perform alkaline cleaning, including closing pump No. 1 22, closing valve No. 9 13 and valve No. 4 8, and opening valve No. 15 19, valve No. 16 20, valve No. 1 5, and valve No. 3 7; then starting pump No. 1 22 to pass the mixed alkaline cleaning solution in tank No. 1 into reverse osmosis module 4 to complete the circulation. After about 2 hours, stop pump No. 1 22 and soak for about 3 hours; then proceed to the next step or cycle a set number of times before proceeding to the next step; Step 4: Open the valve on the outlet pipe of tank 1 to drain tank 1; Step 5: Open valve 11 of tank 3 to add pure water to tank 3, and close the valve after the addition is complete. Step 6: Cleaning is performed, including opening valve No. 12 16, valve No. 13 17, and valve No. 14 18, and opening valve No. 1 5, and then starting pump No. 2 23 until the pH value of the liquid in tank No. 3 stabilizes to 8, and the cleaning is completed; during the cleaning process, part of the cleaning liquid will enter tank No. 1 through the concentrated water main pipe and valve No. 1 5 and be temporarily stored, and will be discharged from tank No. 1 after the cleaning is completed; Step 7: Pickling preparation, including starting valve No. 6 10, filling the No. 2 tank 2 with pure water accounting for about 280% of the volume of the No. 2 tank and then closing it, and then adding 10L of 1% hydrochloric acid solution to the No. 2 tank 2; opening valve No. 9 13, valve No. 11 15 and valve No. 8 12, and starting pump No. 1 22, controlling the acid cleaning solution and pure water to circulate and mix in the pipeline for about 30 minutes to complete the mixing; Step 8: Perform pickling, including closing pump No. 1 22, closing valve No. 9 13 and valve No. 8 12, and opening valve No. 15 19, valve No. 16 20, valve No. 5 9, and valve No. 7 11; then starting pump No. 1 22 to pass the mixed acid cleaning solution in tank No. 2 into reverse osmosis module 4 to complete the circulation. After 2 hours, stop pump No. 1 22 and soak for 3 hours; then proceed to the next step or cycle a set number of times before proceeding to the next step; Step 9: Open the valve on the liquid outlet pipe of tank 2 to drain tank 2; Step 10: Open valve 11 of tank 3 to add pure water to tank 3, and close the valve after tank 3 is filled with pure water. Step 11: Cleaning is performed, including opening valve No. 12 16, valve No. 13 17 and valve No. 14 18, and opening valve No. 1 5, and then starting pump No. 2 23 until the pH value of the liquid in tank No. 3 3 stabilizes to 6-7, and the cleaning is completed; Step 12: Complete the cleaning, drain the liquid in tank No. 1, tank No. 2 and tank No. 3, remove the reverse osmosis membrane, and end the step.

[0027] The reverse osmosis membrane in step 1 is also pre-flushed to remove non-stubborn impurities attached to the reverse osmosis membrane, thereby improving the effects of subsequent alkaline washing and acid washing.

[0028] In step 3, the output power of pump No. 1 22 is gradually increased during alkaline cleaning. When it is just started, it is cleaned at 1 / 3 of the set flow rate. The flow rate is gradually increased over time, and the set circulation cleaning flow rate is reached after 10 minutes to avoid a large amount of impurities and dirt falling off at the beginning of cleaning, which may cause blockage of the pipeline.

[0029] In step 6 and step 11, valve No. 11 of tank No. 3 will be repeatedly opened and closed according to the change of the liquid level in tank No. 3 to control the liquid level in tank No. 3 to be stable during the cleaning process.

[0030] It should be noted that in step 10, after the cleaning process of step 6, a large amount of liquid with a pH close to 8 will remain in the tank body of tank No. 3. This part of the liquid will also be used for the circulating cleaning in step 11. On the one hand, it can save water resources, and on the other hand, the weakly alkaline liquid can better neutralize the acidic cleaning liquid remaining after pickling.

[0031] In some other embodiments, steps 2-4 and 7-9 can be swapped, that is, acid washing is performed first and then water washing, because acid washing can better remove some inorganic dirt on the reverse osmosis membrane. The soaking time in steps 3 and 8 can be adjusted to 1 hour to prevent the acidic and alkaline cleaning solutions from damaging the performance of the reverse osmosis membrane.

[0032] During the implementation process, by utilizing the principle of reverse osmosis membrane, the cleaning water is distinguished according to concentrated water and fresh water, and recycled, thereby reducing the water resources consumed in the cleaning process; by setting up No. 1 tank 1 and No. 2 tank 2, cooperating with No. 1 circulation port 104 and No. 2 circulation port 204, the circulating configuration of the liquid medicine is realized, avoiding the problem of uneven stirring and mixing in the traditional process, and making full use of No. 1 pump 22 used in cleaning the reverse osmosis module 4 to complete the liquid medicine mixing circulation, which also reduces the equipment cost; by adopting the cleaning method, the automatic cleaning of the reverse osmosis membrane is completed, and the liquid in the cleaning process is recycled to reduce the waste of water resources.

[0033] The above description is merely a specific example of the present invention and does not constitute any limitation thereto. It is apparent to those skilled in the art, after understanding the content and principles of the present invention, that various modifications and alterations in form and detail may be made without departing from the principles and structure of the present invention. However, such modifications and alterations based on the concepts of the present invention remain within the scope of protection of the claims of the present invention.

Claims

1. A reverse osmosis membrane offline cleaning device for copper foil production water treatment, characterized in that: The invention comprises a No. 1 tank (1), a No. 2 tank (2), a No. 3 tank (3), a No. 1 pump (22), a No. 2 pump (23) and a reverse osmosis module (4); wherein the No. 1 tank (1) is used to store alkaline cleaning liquid, the No. 2 tank (2) is used to store acidic cleaning liquid, and the No. 3 tank (3) is used to store pure water cleaning liquid; the top of the No. 1 tank (1) is respectively provided with four liquid inlets, namely a No. 1 concentrated water inlet (101), a No. 1 pure water inlet (102), a No. 1 fresh water inlet (103) and a No. 1 circulation inlet (104), the bottom of the No. 1 tank (1) is provided with a No. 1 water outlet (105); the top of the No. 2 tank (2) is provided with a No. 2 concentrated water inlet (201), a No. 2 pure water inlet (202), a No. 2 fresh water inlet (203) and a No. 2 circulation inlet (204), and the bottom of the No. 2 tank (2) is provided with a No. 2 water outlet (205); the top of the No. 3 tank (3) is provided with a No. 3 pure water inlet (301) and a No. 3 fresh water inlet (302), and the bottom of the No. 3 tank (3) is provided with three The water inlet of the reverse osmosis module (4) is connected to the first concentrated water outlet (101) and the second concentrated water outlet (201) through the concentrated water main pipe, and the water outlet of the reverse osmosis module (4) is connected to the first fresh water outlet (103), the second fresh water outlet (203) and the third fresh water outlet (302) through the fresh water main pipe; the first pure water outlet (102), the second pure water outlet (202) and the third pure water outlet (301) are all connected to the external pure water supply equipment; the first water outlet ( The first water outlet (105) and the second water outlet (205) are respectively connected to the water inlet of the first pump (22), and the water outlet of the first pump (22) is respectively connected to the first circulation port (104), the second circulation port (204) and the water inlet of the reverse osmosis module (4); the third water outlet (303) is connected to the water inlet of the second pump (23), and the water outlet of the second pump (23) is respectively connected to the first circulation port (104), the second circulation port (204) and the water inlet of the reverse osmosis module (4).

2. The reverse osmosis membrane offline cleaning device for copper foil production water treatment according to claim 1, characterized in that: It also includes a filter (24), which is arranged between the water inlet end of the reverse osmosis module (4) and the first tank (1), and between the water inlet end of the reverse osmosis module (4) and the second tank (2).

3. The reverse osmosis membrane offline cleaning device for copper foil production water treatment according to claim 2, characterized in that: The top of the No. 1 tank (1) is respectively provided with a No. 1 valve (5), a No. 2 valve (6), a No. 3 valve (7) and a No. 4 valve (8), which correspond to its No. 1 concentrated water inlet (101), No. 1 pure water inlet (102), No. 1 fresh water inlet (103) and No. 1 circulation inlet (104); the top of the No. 2 tank (2) is respectively provided with a No. 5 valve (9), a No. 6 valve (10), a No. 7 valve (11) and a No. 8 valve (12), which correspond to its No. 2 concentrated water inlet (201), No. 2 pure water inlet (202), No. 2 fresh water inlet (203) and No. 2 circulation inlet (204).

4. The reverse osmosis membrane offline cleaning device for copper foil production water treatment according to claim 3, characterized in that: A No. 9 valve (13) serving as a circulation master valve is further provided between the No. 1 pump (22) and the No. 1 circulation port (104) and the No. 2 circulation port (204); the No. 9 valve (13) is located on a common pipeline between the No. 1 circulation port (104), the No. 2 circulation port (204) and the No. 1 pump (22).

5. The reverse osmosis membrane offline cleaning device for copper foil production water treatment according to claim 1, characterized in that: A No. 10 valve (14) for controlling the discharge of liquid from the No. 1 tank (1) is provided between the No. 1 tank (1) and the No. 1 pump (22); and a No. 11 valve (15) for controlling the discharge of liquid from the No. 2 tank (2) is provided between the No. 2 tank (2) and the No. 1 pump (22).

6. The reverse osmosis membrane offline cleaning device for copper foil production water treatment according to claim 1, characterized in that: The top of the No. 3 tank (3) is provided with a No. 11 valve (15) and a No. 12 valve (16) corresponding to the No. 3 pure water inlet (301) and the No. 3 fresh water inlet (302); the bottom of the No. 3 tank (3) is provided with a No. 13 valve (17), and the No. 13 valve (17) is located between the No. 3 tank (3) and the No. 2 pump (23); and the water outlet of the No. 2 pump (23) is also provided with a No. 14 valve (18).

7. The reverse osmosis membrane offline cleaning device for copper foil production water treatment according to claim 2, characterized in that: A No. 15 valve (19) is provided between the No. 1 pump (22) and the filter for controlling the liquid in the No. 1 tank (1) and the No. 2 tank (2) to flow into the filter; a No. 16 valve (20) is also provided between the filter and the water inlet end of the reverse osmosis module (4), and the No. 16 valve (20) is used to control the on-off of the pipeline between the filter and the reverse osmosis module (4).

8. The reverse osmosis membrane offline cleaning device for copper foil production water treatment according to claim 1, characterized in that: The first water outlet (105) of the first tank (1) and the second water outlet (205) of the second tank (2) are both connected to a liquid outlet pipe, and a valve is provided on the liquid outlet pipe.

9. A method for offline cleaning of reverse osmosis membranes for copper foil production water treatment, characterized in that: Based on the cleaning device according to any one of claims 1 to 8, the cleaning method comprises the following steps: Step 1: Connect the reverse osmosis membrane to be cleaned to the reverse osmosis module (4); Step 2: Alkaline cleaning preparation, including adding alkaline cleaning solution of set concentration and volume into tank No. 1 (1), then starting valve No. 2 (6), filling a certain amount of pure water into tank No. 1 (1) and then closing it; opening valve No. 9 (13), valve No. 10 (14) and valve No. 4 (8), and starting pump No. 1 (22) to control the alkaline cleaning solution and pure water to complete the liquid circulation mixing in the pipeline; Step 3: performing alkaline cleaning, including closing pump No. 1 (22), closing valve No. 9 (13) and valve No. 4 (8), and opening valve No. 15 (19), valve No. 16 (20), valve No. 1 (5) and valve No. 3 (7); then starting pump No. 1 (22), passing the mixed alkaline cleaning solution in tank No. 1 (1) into reverse osmosis module (4) to complete the circulation, and after a set time, stopping pump No. 1 (22), and soaking for a set time; Go to the next step or loop for a set number of times before going to the next step; Step 4: Open the valve on the liquid outlet pipe of tank No. 1 (1) to drain tank No. 1 (1); Step 5: Open valve No. 11 (15) of tank No. 3 (3), add pure water into tank No. 3 (3), and close it after the addition is completed; Step 6: Cleaning is performed, including opening valve No. 12 (16), valve No. 13 (17) and valve No. 14 (18), and opening valve No. 1 (5), and then starting pump No. 2 (23) until the pH value of the liquid in tank No. 3 (3) stabilizes to the set value, and the cleaning is completed; Step 7: Pickling preparation, including starting valve No. 6 (10), filling a certain amount of pure water into tank No. 2 (2) and then closing it, and then adding an acid cleaning solution of a set concentration and volume into tank No. 2 (2); opening valve No. 9 (13), valve No. 11 (15) and valve No. 8 (12), and starting pump No. 1 (22) to control the acid cleaning solution and pure water to complete the liquid circulation mixing in the pipeline; Step 8: Performing acid cleaning, including closing pump No. 1 (22), closing valve No. 9 (13) and valve No. 8 (12), and opening valve No. 15 (19), valve No. 16 (20), valve No. 5 (9) and valve No. 7 (11); then starting pump No. 1 (22), passing the mixed acid cleaning solution in tank No. 2 (2) into the reverse osmosis module (4) to complete the circulation, and after a set time, stopping pump No. 1 (22), and soaking for a set time; Go to the next step or loop for a set number of times before going to the next step; Step 9: Open the valve on the liquid outlet pipe of tank No. 2 (2) to drain tank No. 2 (2); Step 10: Open valve No. 11 (15) of tank No. 3 (3), add pure water into tank No. 3 (3), and close it after the addition is completed; Step 11: Cleaning is performed, including opening valve No. 12 (16), valve No. 13 (17) and valve No. 14 (18), and opening valve No. 1 (5), and then starting pump No. 2 (23) until the pH value of the liquid in tank No. 3 (3) stabilizes to the set value, and the cleaning is completed; Step 12: After cleaning is completed, the liquid in tank No. 1 (1), tank No. 2 (2) and tank No. 3 (3) is drained, the reverse osmosis membrane is removed, and the step is ended.

10. The method for offline cleaning of reverse osmosis membrane for copper foil production water treatment according to claim 9, characterized in that: In the steps 6 and 11, the valve No. 11 (15) of the No. 3 tank (3) is repeatedly opened and closed according to the liquid level in the tank, so as to control the liquid level in the No. 3 tank (3) to be stable during the cleaning process.

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