A system for removing aluminum from chemical polishing waste liquid

Abstract

The utility model discloses a kind of chemical polishing waste liquid aluminum-removing systems, including plunger pump, nanofiltration membrane, filter, booster pump, after fine filtration chemical polishing waste liquid collection barrel, chemical polishing concentrated liquid collection barrel and chemical polishing liquid storage barrel, booster pump is transported to filter with chemical polishing waste liquid, plunger pump is transported to nanofiltration membrane with the chemical polishing liquid filtered by filter, chemical polishing liquid is separated by nanofiltration membrane, concentration high chemical polishing liquid is transported to chemical polishing concentrated liquid collection barrel or after fine filtration chemical polishing waste liquid collection barrel and is collected, concentration low chemical polishing liquid is transported to chemical polishing liquid storage barrel and is stored.The utility model uses nanofiltration membrane cooperation plunger pump, concentration large chemical polishing liquid is transported back to chemical polishing concentrated liquid collection barrel or after fine filtration chemical polishing waste liquid collection barrel and is collected.After fine filtration chemical polishing waste liquid collection barrel collected high concentration chemical polishing waste liquid and chemical polishing waste liquid are filtered together in circulation, improve filtration efficiency.Concentration low chemical polishing liquid is transported to chemical polishing liquid storage barrel and is stored, facilitate later-stage concentration processing.

Description

Technical Field

[0001] This utility model relates to the field of chemical polishing waste liquid treatment, and in particular to an aluminum removal system for chemical polishing waste liquid. Background Technology

[0002] Inorganic acids such as sulfuric acid, hydrochloric acid, nitric acid, and phosphoric acid are widely used in the production of aluminum electrolytic capacitors, including in corrosion, formation, and working electrolytes. However, these processes generate large amounts of acidic waste liquid. Direct discharge of this waste acid not only causes serious pollution to the surrounding environment but also results in a significant waste of resources, especially phosphorus, which is becoming increasingly scarce. Therefore, it is essential to protect and recycle these resources as much as possible.

[0003] Currently, the waste acid liquid generated after the above-mentioned production is usually treated by lime neutralization. On the one hand, the neutralization process requires a large amount of alkali, which wastes resources and generates a large amount of wastewater and waste residue, causing secondary pollution. This seriously hinders the sustainable development of related industries and poses a serious threat to the human living environment. On the other hand, the large processing volume results in poor phosphorus recovery from the waste acid liquid, making it difficult to recycle and waste resources. Furthermore, the recovered waste liquid is difficult to meet emission standards.

[0004] In the front-end process of waste acid treatment, aluminum needs to be removed from the waste acid, and the waste acid after aluminum removal is then concentrated and recycled. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide an aluminum removal system for chemical polishing waste liquid.

[0006] The objective of this utility model is achieved through the following technical solution: an aluminum removal system for chemical polishing waste liquid, comprising a plunger pump, a nanofiltration membrane, a filter, a booster pump, a collection tank for finely filtered chemical polishing waste liquid, a collection tank for chemical polishing concentrate, and a storage tank for chemical polishing liquid. The booster pump delivers the chemical polishing waste liquid to the filter, and the plunger pump delivers the chemical polishing liquid filtered by the filter to the nanofiltration membrane. The chemical polishing liquid undergoes liquid-liquid separation through the nanofiltration membrane. The chemical polishing liquid with higher concentration is delivered to the collection tank for chemical polishing concentrate or the collection tank for finely filtered chemical polishing waste liquid for collection, while the chemical polishing liquid with lower concentration is delivered to the storage tank for storage.

[0007] As an improvement to the aluminum removal system for chemical waste liquid of this utility model, the outlet of the filter is connected to the inlet of the plunger pump through a first pipe, and a low-pressure protection switch is provided on the first pipe. The outlet of the plunger pump is connected to the inlet of the nanofiltration membrane through a second pipe, and a raw water pressure relief valve is provided on the second pipe.

[0008] As an improvement to the aluminum removal system for chemical polishing waste liquid of this utility model, the low-concentration outlet of the nanofiltration membrane is connected to the chemical polishing liquid storage tank through a third pipe, and a freshwater flow meter is installed on the third pipe.

[0009] As an improvement to the aluminum removal system for chemical polishing waste liquid of this utility model, the high-concentration outlet of the nanofiltration membrane is connected to a fourth pipe. The outlet end of the fourth pipe is provided with a first branch pipe and a second branch pipe. The outlet ends of the first branch pipe and the second branch pipe are connected to a fifth pipe. The outlet end of the fifth pipe is connected to the inlet of a T-shaped water regulating valve. One outlet of the T-shaped water regulating valve is connected to the inlet of the chemical polishing concentrate collection tank through a sixth pipe, and the other outlet is connected to the inlet of the finely filtered chemical polishing waste liquid collection tank through a seventh pipe. The first branch pipe is provided with a concentrated water pressure relief valve and a pressure-holding valve. The second branch pipe is provided with a quick-flush valve. The fifth pipe is provided with a concentrated water flow meter.

[0010] As an improvement of the aluminum removal system for chemical polishing waste liquid of this utility model, when the quick-flush valve is closed, the flow direction of the concentrate is: from the fourth pipe to the first branch pipe, from the first branch pipe to the fifth pipe, from the fifth pipe to the T-shaped water regulating valve, from the T-shaped water regulating valve to the seventh pipe, and from the seventh pipe to the finely filtered chemical polishing waste liquid collection tank. When the pressure relief valve is closed, the flow direction of the concentrate is as follows: from the fourth pipe to the second branch pipe, from the second branch pipe to the fifth pipe, from the fifth pipe to the T-shaped water regulating valve, from the T-shaped water regulating valve to the sixth pipe, and from the sixth pipe to the chemical concentrate collection tank.

[0011] As an improvement to the aluminum removal system for chemical polishing waste liquid of this utility model, high-level liquid level sensors, medium-level liquid level sensors, and low-level liquid level sensors are provided on the inner side walls of the fine-filtered chemical polishing waste liquid collection tank, the chemical polishing concentrate collection tank, and the chemical polishing liquid storage tank. High-level liquid level indicator lights, medium-level liquid level indicator lights, and low-level liquid level indicator lights are provided on the outer side walls of the fine-filtered chemical polishing waste liquid collection tank, the chemical polishing concentrate collection tank, and the chemical polishing liquid storage tank, corresponding to the positions of the high-level liquid level sensors, medium-level liquid level sensors, and low-level liquid level sensors. When the high-level liquid level indicator light is red, it indicates that the liquid level is full. When the high-level liquid level sensor detects liquid, the high-level liquid level indicator light is red. When the mid-level liquid level sensor and the low-level liquid level sensor do not detect liquid, the mid-level liquid level indicator and the low-level liquid level indicator will turn red. When the mid-level liquid level indicator and the low-level liquid level indicator turn red, it indicates that there is a shortage of water in the mid- and low-level liquid levels.

[0012] As an improvement to the aluminum removal system for chemical waste liquid of this utility model, the filter is a cotton core filter.

[0013] As an improvement to the aluminum removal system for chemical waste liquid of this utility model, the high pressure protection pressure of the nanofiltration membrane is set to no more than 6 MPa, and the low pressure protection pressure of the nanofiltration membrane is set to no less than 0.01 MPa.

[0014] The beneficial effects of this invention are as follows: This invention uses a nanofiltration membrane in conjunction with a plunger pump. The nanofiltration membrane uses pressure difference as the driving force and utilizes the membrane pore size to screen the chemical polishing solution. The high-concentration chemical polishing solution is transported back to the chemical polishing concentrate collection tank or the finely filtered chemical polishing waste liquid collection tank for collection. The high-concentration chemical polishing waste liquid collected in the finely filtered chemical polishing waste liquid collection tank is circulated and filtered together with the chemical polishing waste liquid to improve filtration efficiency. The low-concentration chemical polishing solution is transported to the chemical polishing solution storage tank for storage, facilitating subsequent concentration processing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the system structure of this utility model; The attached diagram is labeled as follows: 1. Plunger pump; 2. Nanofiltration membrane; 3. Filter; 4. Booster pump; 5. Waste liquid collection tank after fine filtration; 6. Concentrated chemical filtration solution collection tank; 7. Chemical filtration solution storage tank; 8. First pipeline; 9. Low-pressure protection switch; 10. Second pipeline; 11. Raw water pressure relief valve; 12. Third pipeline; 13. Freshwater flow meter; 14. Fourth pipeline; 15. First branch pipe; 16. Second branch pipe; 17. Fifth pipeline; 18. T-shaped water regulating valve; 19. Sixth pipeline; 20. Seventh pipeline; 21. Concentrate pressure relief valve; 22. Pressure relief valve; 23. Quick flush valve; 24. Concentrate flow meter; 25. High level indicator light; 26. Medium level indicator light; 27. Low level indicator light. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0018] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0019] like Figure 1 As shown, an aluminum removal system for chemical polishing waste liquid includes a plunger pump 1, a nanofiltration membrane 2, a filter 3, a booster pump 4, a finely filtered chemical polishing waste liquid collection tank 5, a chemical polishing concentrate collection tank 6, and a chemical polishing liquid storage tank 7. The booster pump 4 transports the chemical polishing waste liquid in the finely filtered chemical polishing waste liquid collection tank 5 to the filter 3 for filtration. The plunger pump 1 transports the chemical polishing liquid filtered by the filter 3 to the nanofiltration membrane 2. The chemical polishing liquid undergoes liquid-liquid separation through the nanofiltration membrane 2. The chemical polishing liquid with high concentration is transported to the chemical polishing concentrate collection tank 6 or the finely filtered chemical polishing waste liquid collection tank 5 for collection, while the chemical polishing liquid with low concentration is transported to the chemical polishing liquid storage tank 7 for storage.

[0020] Preferably, the outlet of the filter 3 is connected to the inlet of the plunger pump 1 through the first pipe 8, and the first pipe 8 is equipped with a low-pressure protection switch 9. The outlet of the plunger pump 1 is connected to the inlet of the nanofiltration membrane 2 through the second pipe 10, and the second pipe 10 is equipped with a raw water pressure relief valve 11.

[0021] Preferably, the low-concentration outlet of the nanofiltration membrane 2 is connected to the chemical slurry storage tank 7 through a third pipe 12, and a freshwater flow meter 13 is installed on the third pipe 12.

[0022] Preferably, the high-concentration outlet of the nanofiltration membrane 2 is connected to the fourth pipe 14. The outlet end of the fourth pipe 14 is provided with a first branch pipe 15 and a second branch pipe 16. The outlet ends of the first branch pipe 15 and the second branch pipe 16 are connected to the fifth pipe 17. The outlet end of the fifth pipe 17 is connected to the inlet of the T-shaped water regulating valve 18. One outlet of the T-shaped water regulating valve 18 is connected to the inlet of the chemical slurry concentrate collection tank 6 through the sixth pipe 19, and the other outlet is connected to the inlet of the fine filtration chemical slurry waste collection tank 5 through the seventh pipe 20. The first branch pipe 15 is provided with a concentrate pressure relief valve 21 and a pressure relief valve 22. The second branch pipe 16 is provided with a quick flush valve 23. The fifth pipe 17 is provided with a concentrate flow meter 24.

[0023] Preferably, when the quick-flush valve 23 is closed, the flow direction of the concentrate is: from the fourth pipe 14 to the first branch pipe 15, from the first branch pipe 15 to the fifth pipe 17, from the fifth pipe 17 to the T-shaped water regulating valve 18, from the T-shaped water regulating valve 18 to the seventh pipe 20, and from the seventh pipe 20 to the fine filtration waste liquid collection tank 5. When the pressure relief valve 22 is closed, the flow direction of the concentrate is as follows: from the fourth pipe 14 to the second branch pipe 15, from the second branch pipe 16 to the fifth pipe 17, from the fifth pipe 17 to the T-shaped water regulating valve 18, from the T-shaped water regulating valve 18 to the sixth pipe 19, and from the sixth pipe 19 to the chemical concentrate collection tank 6.

[0024] Preferably, the inner walls of the fine-filtration chemical waste liquid collection tank 5, the chemical waste liquid concentration collection tank 6, and the chemical waste liquid storage tank 7 are all equipped with high-level liquid level sensors, medium-level liquid level sensors, and low-level liquid level sensors. The outer walls of the fine-filtration chemical waste liquid collection tank, the chemical waste liquid concentration collection tank, and the chemical waste liquid storage tank are equipped with high-level liquid level indicator lights 25, medium-level liquid level indicator lights 26, and low-level liquid level indicator lights 27, respectively, at the positions corresponding to the high-level liquid level sensors and the medium-level liquid level sensors. When the high-level liquid level indicator light 25 shows a red light, it indicates that the liquid level is full. When the high-level liquid level sensor detects liquid, the high-level liquid level indicator light 25 shows a red light. When the middle level sensor and the low level sensor do not detect liquid, the middle level indicator 26 and the low level indicator 27 will turn red. When the middle level indicator 26 and the low level indicator 27 turn red, it indicates that there is a shortage of water in the middle and low levels.

[0025] Preferably, filter 3 is a cotton core filter. Cotton core filters can effectively remove large particles such as rust and silt from water and can effectively protect the liquid separated by the subsequent nanofiltration membrane.

[0026] Preferably, the high pressure protection pressure of nanofiltration membrane 2 is set to no more than 6 MPa, and the low pressure protection pressure of nanofiltration membrane 2 is set to no less than 0.01 MPa.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and structure of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A system for removing aluminum from chemical polishing waste liquid, characterized in that, The system includes a plunger pump, a nanofiltration membrane, a filter, a booster pump, a collection tank for chemical and polishing waste liquid after fine filtration, a collection tank for chemical and polishing concentrate, and a storage tank for chemical and polishing solution. The booster pump delivers the chemical and polishing waste liquid to the filter, and the plunger pump delivers the chemical and polishing solution filtered by the filter to the nanofiltration membrane. The chemical and polishing solution undergoes liquid-liquid separation through the nanofiltration membrane. The chemical and polishing solution with a high concentration is delivered to the collection tank for chemical and polishing concentrate or the collection tank for chemical and polishing waste liquid after fine filtration for collection, while the chemical and polishing solution with a low concentration is delivered to the storage tank for storage.

2. The aluminum removal system for chemical polishing waste liquid according to claim 1, characterized in that, The outlet of the filter is connected to the inlet of the plunger pump through a first pipe, and a low-pressure protection switch is provided on the first pipe. The outlet of the plunger pump is connected to the inlet of the nanofiltration membrane through a second pipe, and a raw water pressure relief valve is provided on the second pipe.

3. The aluminum removal system for chemical polishing waste liquid according to claim 1, characterized in that, The low-concentration outlet of the nanofiltration membrane is connected to the chemical slurry storage tank via a third pipe, and a freshwater flow meter is installed on the third pipe.

4. The aluminum removal system for chemical polishing waste liquid according to claim 1, characterized in that, The high-concentration outlet of the nanofiltration membrane is connected to a fourth pipe. The outlet end of the fourth pipe is provided with a first branch pipe and a second branch pipe. The outlet ends of the first and second branch pipes are connected to a fifth pipe. The outlet end of the fifth pipe is connected to the inlet of a T-shaped water regulating valve. One outlet of the T-shaped water regulating valve is connected to the inlet of the chemical slurry concentrate collection tank through a sixth pipe, and the other outlet is connected to the inlet of the fine filtration chemical slurry waste collection tank through a seventh pipe. The first branch pipe is provided with a concentrate pressure relief valve and a pressure-holding valve. The second branch pipe is provided with a quick-flush valve. The fifth pipe is provided with a concentrate flow meter.

5. The aluminum removal system for chemical polishing waste liquid according to claim 4, characterized in that, When the quick-flush valve is closed, the flow direction of the concentrate is as follows: from the fourth pipe to the first branch pipe, from the first branch pipe to the fifth pipe, from the fifth pipe to the T-shaped water regulating valve, from the T-shaped water regulating valve to the seventh pipe, and from the seventh pipe to the fine filtration waste liquid collection tank. When the pressure relief valve is closed, the flow direction of the concentrate is as follows: from the fourth pipe to the second branch pipe, from the second branch pipe to the fifth pipe, from the fifth pipe to the T-shaped water regulating valve, from the T-shaped water regulating valve to the sixth pipe, and from the sixth pipe to the chemical concentrate collection tank.

6. The aluminum removal system for chemical polishing waste liquid according to claim 1, characterized in that, The inner walls of the filtration waste liquid collection tank, the filtration concentrate collection tank, and the filtration liquid storage tank are all equipped with high-level, mid-level, and low-level liquid level sensors. The outer walls of the filtration waste liquid collection tank, the filtration concentrate collection tank, and the filtration liquid storage tank are equipped with high-level, mid-level, and low-level liquid level indicator lights, respectively, corresponding to the positions of the high-level, mid-level, and low-level liquid level sensors. When the high-level liquid level indicator light is red, it indicates that the liquid level is full. When the high-level liquid level sensor detects liquid, the high-level liquid level indicator light will turn red. When the mid-level liquid level sensor and the low-level liquid level sensor do not detect liquid, the mid-level liquid level indicator and the low-level liquid level indicator will turn red. When the mid-level liquid level indicator and the low-level liquid level indicator turn red, it indicates that there is a shortage of water in the mid- and low-level liquid levels.

7. The aluminum removal system for chemical polishing waste liquid according to claim 1, characterized in that, The filter is a cotton core filter.

8. The aluminum removal system for chemical polishing waste liquid according to claim 1, characterized in that, The high-pressure protection pressure of the nanofiltration membrane is set to no more than 6 MPa, and the low-pressure protection pressure of the nanofiltration membrane is set to no less than 0.01 MPa.

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