Graphite washing device

Abstract

The utility model provides a graphite washing device which comprises a plurality of treatment mechanisms, a waste water pipeline, a waste water buffer tank, a neutralization buffer tank, a reverse osmosis treatment mechanism and a water tank. The plurality of treatment mechanisms are respectively connected with the wastewater buffer tank through wastewater pipelines, and at least part of wastewater is discharged into the wastewater buffer tank; the neutralization buffer tank is connected with the wastewater buffer tank and is used for neutralizing wastewater; the reverse osmosis treatment mechanism is connected with the neutralization buffer tank and is used for performing reverse osmosis treatment on the neutralized wastewater; the water tank is connected with the reverse osmosis treatment mechanism, is respectively connected with the plurality of treatment mechanisms and is used for supplying liquid to the plurality of treatment mechanisms. The graphite washing device solves the problem of high water consumption of graphite washing in the prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of battery negative electrode materials, and more specifically, to a graphite ink washing device. Background Technology

[0002] Graphite, as an important non-metallic mineral resource, possesses excellent properties such as high-temperature resistance, good thermal and electrical conductivity, and lubricity. It plays a crucial role in many high-tech industries, including batteries, semiconductors, and aerospace. To meet the demands of these high-end applications, graphite often needs to achieve extremely high purity levels, especially spherical graphite, which has attracted considerable attention due to its application in lithium-ion battery anode materials. Among graphite purification technologies, the hydrofluoric acid method and the alkali-acid method are the most common chemical purification routes. The hydrofluoric acid method is simple and was widely used in the early days; however, its drawbacks are also significant: fluoride ions cause significant environmental pollution and are highly harmful to human health, and national environmental protection requirements are becoming increasingly stringent. In contrast, the alkali-acid method is an environmentally friendly chemical purification approach. This method primarily uses alkaline substances such as sodium hydroxide to initially treat impurities in the graphite, followed by acid washing to further remove residual impurities. However, this process is not without challenges. The alkaline-acid purification process involves alkaline roasting. While alkaline roasting can effectively decompose some impurities, some impurities in graphite react with sodium hydroxide to form silicates and other impurities. Since silicates and other impurities have low solubility, this means that a large amount of clean water is needed in the subsequent water washing process to thoroughly rinse away these insoluble impurities, resulting in a large consumption of water resources. This not only increases production costs but also runs counter to the concept of environmental protection. Utility Model Content

[0003] The main objective of this invention is to provide a graphite ink washing device to solve the problem of large water consumption in the existing graphite ink washing technology.

[0004] To achieve the above objectives, according to one aspect of the present invention, a petroleum water washing device is provided, comprising: multiple processing units, a wastewater pipeline, a wastewater buffer tank, a neutralization buffer tank, a reverse osmosis treatment unit, and a water tank. Materials are sequentially washed through the multiple processing units. The multiple processing units are respectively connected to the wastewater buffer tank via wastewater pipelines, and at least a portion of the wastewater is discharged into the wastewater buffer tank. The neutralization buffer tank is connected to the wastewater buffer tank for neutralizing the wastewater. The reverse osmosis treatment unit is connected to the neutralization buffer tank for performing reverse osmosis treatment on the neutralized wastewater. The water tank is connected to the reverse osmosis treatment unit and also to the multiple processing units for supplying liquid to the multiple processing units.

[0005] Furthermore, the processing unit located at the first end among the multiple processing units is the first processing unit. The first processing unit includes: a first water washing separation unit, a first pulping tank for pulping materials, and a second water washing separation unit. The first water washing separation unit has a first feed inlet, through which the material enters the first water washing separation unit. The first water washing separation unit, the first pulping tank, and the second water washing separation unit are connected in sequence. The first water washing separation unit has a first water outlet, and the second water washing separation unit has a second water outlet. Both the first water outlet and the second water outlet are connected to a wastewater buffer tank, and wastewater is discharged into the wastewater buffer tank.

[0006] Furthermore, the multiple processing units also include a second processing unit located on one side of the first processing unit. The first processing unit is connected to the second processing unit. The second processing unit includes: a third water washing separator, a second pulping tank for pulping the material, and a fourth water washing separator. The third water washing separator has a second inlet, through which the material enters the third water washing separator. The third water washing separator, the second pulping tank, and the fourth water washing separator are connected in sequence. The third water washing separator has a third outlet, and the fourth water washing separator has a fourth outlet. Both the third and fourth outlets are connected to a wastewater buffer tank, and wastewater is discharged into the wastewater buffer tank.

[0007] Furthermore, the multiple treatment units also include a third treatment unit located on one side of the second treatment unit. The second treatment unit is connected to the third treatment unit. The third treatment unit includes a fifth water washing separator, which includes a fifth water outlet. The fifth water outlet is connected to a wastewater buffer tank and discharges wastewater into the wastewater buffer tank.

[0008] Furthermore, the graphite ink washing device also includes a water quality collection layer and a conductivity detection device, which are located at the fourth outlet; and / or at the fifth outlet; and / or at the neutralization buffer tank.

[0009] Furthermore, the graphite ink washing device also includes a water recycling mechanism, which includes a return pipe and a return tank. One end of the return pipe is connected to the fourth and fifth water outlets respectively, and the other end of the return pipe is connected to the first and second water washing separators of the first treatment mechanism, and to the third and fourth water washing separators of the second treatment mechanism. The return tank is installed on the return pipe.

[0010] Furthermore, the graphite ink washing device also includes connecting valves, which include a second connecting valve and a fourth connecting valve. The second connecting valve is located between the fourth outlet and the wastewater buffer tank; the fourth connecting valve is located on the return pipe and between the fourth outlet and the return tank.

[0011] Furthermore, the graphite ink washing device also includes connecting valves, including a third connecting valve and a fifth connecting valve. The third connecting valve is located between the fifth outlet and the wastewater buffer tank; the fifth connecting valve is located on the return pipe and between the fifth outlet and the return tank.

[0012] Furthermore, the graphite ink washing device also includes a water supply mechanism, which includes a tap water conveying mechanism and a pure water conveying mechanism. The tap water conveying mechanism is connected to the first water washing separator of the first treatment unit and is used to supply water to the first treatment unit. The pure water conveying mechanism is connected to the third water washing separator of the second treatment unit and is used to supply water to the second and third treatment units.

[0013] Furthermore, the graphite washing device also includes a screening element, which is located between the wastewater buffer tank and the neutralization buffer tank, and intercepts graphite particles in the wastewater.

[0014] By applying the technical solution of this utility model, multiple processing units are set up, all of which are connected to wastewater pipelines. This allows graphite to undergo multiple gradient water washing processes, and the wastewater from each gradient washing can be treated and reused, thereby reducing wastewater treatment costs and conserving water resources. Specifically, after the material is washed by multiple processing units, impurity ions from the graphite reaction can be effectively removed. Since all processing units are connected to wastewater pipelines, the wastewater from the graphite ink washing process can flow into a neutralization buffer tank and a reverse osmosis treatment unit for further treatment. The treated wastewater becomes usable water, which can be returned to the multiple processing units and used to supply liquid to them, thus achieving wastewater treatment and reuse, reducing water consumption in the graphite ink washing process, and consequently lowering costs. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic diagram of the graphite ink washing device of this utility model is shown.

[0017] The above figures include the following reference numerals:

[0018] 10. First treatment unit; 11. First water washing separator; 12. First pulping tank; 13. Second water washing separator; 20. Second treatment unit; 21. Third water washing separator; 22. Second pulping tank; 23. Fourth water washing separator; 30. Third treatment unit; 31. Fifth water washing separator; 40. Wastewater pipe; 50. Wastewater buffer tank; 51. First wastewater tank; 52. Second wastewater tank; 53. Third wastewater tank; 54. Fourth wastewater tank; 60. Neutralization buffer tank; 70. Reverse osmosis treatment unit; 80. Water tank; 90. Reclaimed water unit; 91. Return pipe; 92. Return tank; 101. First connecting valve; 102. Second connecting valve; 103. Third connecting valve; 104. Fourth connecting valve; 105. Fifth connecting valve; 111. Tap water conveying unit; 112. Pure water conveying unit. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0021] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0022] To address the problem of high water consumption in graphite ink washing in existing technologies, this invention provides a graphite ink washing device.

[0023] like Figure 1 The illustrated petroleum water washing device includes: multiple processing units, a wastewater pipeline 40, a wastewater buffer tank 50, a neutralization buffer tank 60, a reverse osmosis treatment unit 70, and a water tank 80. Materials are sequentially washed through the multiple processing units. Each of the multiple processing units is connected to the wastewater buffer tank 50 via the wastewater pipeline 40, and at least a portion of the wastewater is discharged into the wastewater buffer tank 50. The neutralization buffer tank 60 is connected to the wastewater buffer tank 50 for neutralizing the wastewater. The reverse osmosis treatment unit 70 is connected to the neutralization buffer tank 60 for reverse osmosis treatment of the neutralized wastewater. The water tank 80 is connected to the reverse osmosis treatment unit 70 and also to the multiple processing units for supplying liquid to them.

[0024] This embodiment incorporates multiple processing units, all connected to wastewater pipe 40, enabling graphite to undergo multiple gradient washing processes. The wastewater from these multiple washes can be treated and reused, reducing wastewater treatment costs and conserving water resources. Specifically, the washing process by these multiple units effectively removes impurity ions from the graphite reaction. Since the multiple units are connected to wastewater pipe 40, the wastewater from the graphite washing process flows into neutralization buffer tank 60 and reverse osmosis treatment unit 70 for further treatment. This treated wastewater becomes usable water and can be returned to the multiple processing units to supply liquid, thus achieving wastewater treatment and reuse, reducing water consumption in the graphite washing process, and consequently lowering costs.

[0025] It should be noted that the wastewater buffer tank 50 in this embodiment can be configured as a single wastewater buffer tank 50 with a large volume, so that the wastewater flowing from the first treatment unit 10, the second treatment unit 20, and the third treatment unit 30 into the wastewater pipe 40 all flows into the same wastewater buffer tank 50. Alternatively, multiple wastewater buffer tanks 50 can be configured, so that each treatment unit has an independent wastewater buffer tank 50, ensuring that each wastewater buffer tank 50 is connected to the neutralization buffer tank 60, and that the wastewater in each wastewater buffer tank 50 can flow into the neutralization buffer tank 60. For example, as... Figure 1 As shown, the wastewater buffer tank 50 in this embodiment includes a first wastewater tank 51, a second wastewater tank 52, a third wastewater tank 53, and a fourth wastewater tank 54. Wastewater from the first treatment unit 10 flowing into the wastewater pipe 40 flows into the first wastewater tank 51 and the second wastewater tank 52; wastewater from the second treatment unit 20 flowing into the wastewater pipe 40 flows into the third wastewater tank 53; and wastewater from the third treatment unit 30 flowing into the wastewater pipe 40 flows into the fourth wastewater tank 54. All four wastewater tanks are connected to the neutralization buffer tank 60. In this embodiment, the wastewater from the first treatment unit 10 flowing into the wastewater pipe 40 flows into the first wastewater tank 51 and the second wastewater tank 52 because the first treatment unit 10 has two outlets, and the wastewater flowing from both outlets flows into the wastewater pipe 40. Of course, depending on the actual situation, the wastewater flowing from both outlets of the first treatment unit 10 can also be configured to flow into the same wastewater tank through the wastewater pipe 40. In this embodiment, the reverse osmosis treatment unit 70 refers to existing reverse osmosis treatment equipment, pure water equipment, and other equipment capable of reverse osmosis treatment of water containing impurities.

[0026] In this embodiment, the first processing unit 10 processes the mixture of graphite and acid, the second processing unit 20 processes the mixture of graphite and alkali solution processed by the first processing unit 10, and the third processing unit 30 processes the mixture of graphite and acid solution processed by the second processing unit 20. This embodiment uses the washing of graphite as an example for explanation. Of course, depending on the actual situation, the graphite washing device of this embodiment can also be applied to the washing process of other materials to save water consumption.

[0027] In this embodiment, the processing unit located at the first end among the multiple processing units is the first processing unit 10. The first processing unit 10 includes: a first water washing separator 11, a first pulping tank 12 for pulping materials, and a second water washing separator 13. The first water washing separator 11 has a first inlet, through which the material enters the first water washing separator 11 and undergoes solid-liquid separation. The first water washing separator 11, the first pulping tank 12, and the second water washing separator 13 are sequentially connected. The first water washing separator 11 has a first outlet, and the second water washing separator 13 has a second outlet. Both the first and second outlets are connected to a wastewater buffer tank 50, and wastewater is discharged into the wastewater buffer tank 50. Specifically, the graphite ink washing device in this embodiment also includes a material conveying pipe connected to the first water washing separator 11. The material conveying pipe conveys the material into the first water washing separator 11 through the first inlet. Here, the material refers to a mixture of graphite and acid. The first washing separator 11 is connected to the first pulping tank 12, which is used for dispersing and pulping materials. The first pulping tank 12 is connected to the second washing separator 13 via a pipeline. Both the first and second outlets are connected to the wastewater pipeline 40. The first outlet is connected to the first wastewater tank 51 via the wastewater pipeline 40, and the second outlet is connected to the second wastewater tank 52 via the wastewater pipeline 40. In this way, the material conveying pipeline transports the material to the first washing separator 11 through the first inlet, and the acid is discharged from the first outlet into the first wastewater tank 51. Then the material enters the first pulping tank 12 for dispersing and pulping, and then enters the second washing separator 13. Finally, the wastewater flows out from the second outlet and flows into the second wastewater tank 52 through the wastewater pipeline 40, thereby realizing the washing of the first treatment unit 10. It should be noted that the wastewater in this embodiment includes the acid solution discharged from the first outlet, the alkali solution discharged from the third outlet, and the water containing impurities after graphite washing discharged from the second outlet. In other words, the liquid discharged from the outlets of each water washing separator in this embodiment, whether it is acid solution, alkali solution, or water after washing graphite, is collectively referred to as wastewater.

[0028] In this embodiment, the multiple processing units also include a second processing unit 20 disposed on one side of the first processing unit 10. The first processing unit 10 and the second processing unit 20 are connected. The second processing unit 20 includes: a third water washing separator 21, a second pulping tank 22 for pulping materials, and a fourth water washing separator 23. The third water washing separator 21 has a second feed inlet. The materials enter the third water washing separator 21 through the second feed inlet and undergo solid-liquid separation in the third water washing separator 21. The third water washing separator 21, the second pulping tank 22, and the fourth water washing separator 23 are connected in sequence. The third water washing separator 21 has a third outlet, and the fourth water washing separator 23 has a fourth outlet. Both the third outlet and the fourth outlet are connected to the wastewater buffer tank 50 and discharge wastewater into the wastewater buffer tank 50. Specifically, the material conveying pipeline is connected to the third water washing separator 21 and conveys material to the third water washing separator 21. The third water washing separator 21 is connected to the second pulping tank 22, which is used for dispersing and pulping the material. The second pulping tank 22 is connected to the fourth water washing separator 23 through a pipeline. The third outlet is connected to the third wastewater tank 53 through the wastewater pipeline 40, and the fourth outlet is connected to the third wastewater tank 53 through the wastewater pipeline 40. A connecting valve can be installed between the fourth outlet and the third wastewater tank 53. In this way, the material conveying pipeline conveys the material to the third water washing separator 21 through the second inlet, and the wastewater is discharged into the third wastewater tank 53 through the third outlet. Then the material enters the second pulping tank 22 for dispersing and pulping, and then enters the third water washing separator 21. Finally, the wastewater flows out from the fourth outlet and flows into the third wastewater tank 53 through the wastewater pipeline 40, thereby realizing the water washing of the second treatment unit 20. In this embodiment, the wastewater flowing out of the third outlet and the wastewater flowing out of the fourth outlet both flow into the third wastewater tank 53. Depending on the actual situation, a wastewater buffer tank 50 can also be set up for the wastewater flowing out of the third outlet and the wastewater flowing out of the fourth outlet.

[0029] In this embodiment, the multiple processing units also include a third processing unit 30 disposed on one side of the second processing unit 20. The second processing unit 20 and the third processing unit 30 are connected. The third processing unit 30 includes a fifth water washing separator 31, which includes a fifth outlet. The fifth outlet is connected to a wastewater buffer tank 50 and discharges wastewater into the wastewater buffer tank 50. Specifically, the fifth water washing separator 31 also has a third feed inlet, a material conveying pipe connected to the third feed inlet, and a fifth outlet connected to a fourth wastewater tank 54. The fourth wastewater tank 54 is connected to a neutralization buffer tank 60. The material conveying pipe conveys material to the fifth water washing separator 31 through the third feed inlet. The fifth water washing separator 31 washes the material and discharges wastewater through the fifth outlet, thereby realizing the material washing treatment of the third processing unit 30. The wastewater flows out to the fourth wastewater tank 54 through the wastewater pipe 40.

[0030] In this embodiment, the graphite ink washing device further includes a water quality collection layer and a conductivity detector, which are disposed at the fourth outlet; and / or at the fifth outlet; and / or at the neutralization buffer tank 60. By setting the water quality collection layer and conductivity detector, the water quality at the second outlet, the fourth outlet, and the neutralization buffer tank 60 can be monitored to determine the usability of the wastewater. Optionally, the water quality collection layer can be configured as a pH monitoring device to detect the pH value of the wastewater. The conductivity detector can detect the conductivity in the wastewater to determine the ion concentration in the wastewater. Specifically, in this embodiment, water quality collection layers are provided at the fourth outlet, the fifth outlet, and the neutralization buffer tank 60 to determine the pH value of the wastewater flowing out of the fourth water washing separator 23 and the fifth water washing separator 31, as well as the neutralization treatment status of the wastewater by the neutralization buffer tank 60. The conductivity detection device is installed at both the fourth and fifth water outlets to monitor the ion concentration in the wastewater discharged from the fourth water washing separator 23 and the fifth water washing separator 31 in real time, so as to determine how the wastewater should be treated.

[0031] In this embodiment, the graphite ink washing device further includes a wastewater recycling mechanism 90, which includes a return pipe 91 and a return tank 92. One end of the return pipe 91 is connected to the fourth outlet and the fifth outlet, respectively, and the other end of the return pipe 91 is connected to the first water washing separator 11 and the second water washing separator 13 of the first treatment mechanism, and is also connected to the third water washing separator 21 and the fourth water washing separator 23 of the second treatment mechanism 20. The return tank 92 is installed on the return pipe 91, thereby realizing the recycling of wastewater. Specifically, the return pipe 91 in this embodiment includes a first pipe, a second pipe, a third pipe, a fourth pipe, and a confluence pipe. The first pipe and the second pipe converge at one end of the confluence pipe, and the third pipe and the fourth pipe separate at the other end of the confluence pipe. The return tank 92 in this embodiment is installed on the confluence pipe. The first pipe is connected to the fourth outlet. The wastewater at the fourth outlet is tested for water quality by a water quality sampling layer and a conductivity detector. Wastewater that meets the set requirements after testing is recycled water, which flows into the first pipe. The second pipe is connected to the fifth outlet. Wastewater at the fifth outlet undergoes water quality testing via a water quality sampling layer and conductivity detector. Wastewater meeting the set requirements is reused and flows into the second pipe. The first and second pipes merge at a confluence pipe. Wastewater in the confluence pipe flows directly back to the first treatment unit 10 via the fourth pipe. Simultaneously, wastewater in the confluence pipe flows directly back to the second treatment unit 20 via the fifth pipe. This process requires no additional wastewater treatment; as long as it meets the set requirements, it can be directly reused, thus achieving wastewater recycling and reducing wastewater treatment costs. Optionally, the return tank 92 may also include a first and a second reused water collection tank. The first reused water collection tank is located on the first pipe, and the second reused water collection tank is located on the second pipe, used to regulate the flow rate of the return pipe 91.

[0032] The water recycling mechanism 90 in this embodiment connects both the fourth and fifth outlets to the wastewater pipe 40 and the return pipe 91 simultaneously. Combined with the detection by the water quality sampling layer and conductivity detector, a portion of the wastewater flowing from the second and third treatment units 20 enters the wastewater pipe 40 for neutralization and then is recycled. The remaining portion of the wastewater from the second and third treatment units 20, after testing, can directly enter the return pipe 91 for recycling, thereby reducing the consumption of tap water and purified water, saving water and lowering costs. The detection results of the water quality sampling layer and conductivity detector can serve as criteria for determining whether wastewater flows into the wastewater pipe 40 or the return pipe 91. In this embodiment, for wastewater at the fourth outlet, if the water quality sampling layer's detection result satisfies a pH value less than 8 and a conductivity sensor's detection result satisfies a conductivity less than 400 μS / cm, the fourth outlet is connected to the return pipe 91, allowing the wastewater to be directly recycled. If neither of these two detection results is met, the fourth outlet is connected to the wastewater pipe 40, allowing the wastewater to be treated by the neutralization buffer tank 60 and the reverse osmosis treatment unit 70 before recycling. For wastewater at the fifth outlet, if the water quality sampling layer's detection result satisfies a pH value greater than 4 and a conductivity sensor's detection result satisfies a conductivity less than 200 μS / cm, the fifth outlet is connected to the return pipe 91, allowing the wastewater to be directly recycled. If neither of these two detection results is met, the fifth outlet is connected to the wastewater pipe 40, allowing the wastewater to be treated by the neutralization buffer tank 60 and the reverse osmosis treatment unit 70 before recycling.

[0033] In this embodiment, the graphite ink washing device also includes connecting valves, including a second connecting valve 102 and a fourth connecting valve 104. The second connecting valve 102 is disposed between the fourth outlet and the wastewater buffer tank 50; the fourth connecting valve 104 is disposed on the return pipe 91 and between the fourth outlet and the return tank 92, thereby making it simpler and more convenient for the wastewater flowing out of the fourth outlet to switch between flowing into the wastewater pipe 40 and flowing into the return pipe 91. Specifically, in this embodiment, the fourth connecting valve 104 is installed on the first pipeline. When the wastewater at the fourth outlet meets the detection requirements of the water quality sampling layer and the conductivity detection device, the second connecting valve 102 can be controlled to close the connection between the fourth outlet and the wastewater buffer tank 50, while the fourth connecting valve 104 can be controlled to open the connection between the fourth outlet and the return pipe 91. When the wastewater at the fourth outlet does not meet the detection requirements of the water quality sampling layer and the conductivity detection device, the second connecting valve 102 can be controlled to open the connection between the fourth outlet and the wastewater pipeline 40, while the fourth connecting valve 104 can be controlled to close the connection between the fourth outlet and the return pipe 91. In this way, the wastewater can be flexibly controlled to determine whether it needs to be treated by the neutralization buffer tank 60 and the reverse osmosis treatment unit 70 before being recycled, based on the water quality of the wastewater discharged from the second treatment unit 20.

[0034] In this embodiment, the graphite ink washing device also includes connecting valves, including a third connecting valve 103 and a fifth connecting valve 105. The third connecting valve 103 is disposed between the fifth outlet and the wastewater buffer tank 50; the fifth connecting valve 105 is disposed on the return pipe 91 and between the fifth outlet and the return tank 92, thereby making it simpler and more convenient for the wastewater flowing out of the fifth outlet to switch between flowing into the wastewater pipe 40 and flowing into the return pipe 91. Specifically, in this embodiment, the fifth connecting valve 105 is installed on the second pipe of the return pipe 91. When the wastewater at the fifth outlet meets the detection requirements of the water quality sampling layer and the conductivity detection device, the third connecting valve 103 can be controlled to close the connection between the fifth outlet and the wastewater buffer tank 50, and at the same time, the fifth connecting valve 105 can be controlled to open the connection between the fifth outlet and the return pipe 91. When the wastewater at the fifth outlet does not meet the detection requirements of the water quality sampling layer and the conductivity detection device, the third connecting valve 103 can be controlled to open the connection between the fifth outlet and the wastewater pipe 40, and at the same time, the fifth connecting valve 105 can be controlled to close the connection between the fifth outlet and the return pipe 91. In this way, the wastewater can be flexibly controlled to determine whether it needs to be treated by the neutralization buffer tank 60 and the reverse osmosis treatment unit 70 before being recycled, based on the water quality of the wastewater discharged from the third treatment unit 30.

[0035] Optionally, a first connecting valve 101 can be installed between the second outlet and the wastewater buffer tank 50, thereby enabling flexible control of the connection between the first outlet and the wastewater buffer tank 50 to improve the flexibility of wastewater discharge from the first treatment unit 10.

[0036] In this embodiment, the graphite washing device further includes a screening element disposed between the wastewater buffer tank 50 and the neutralization buffer tank 60. The screening element intercepts graphite particles in the wastewater, thereby reducing the amount of graphite particles entering the neutralization buffer tank 60 and preventing these particles from affecting subsequent neutralization and membrane treatment processes, thus improving wastewater treatment efficiency and quality. Specifically, in this embodiment, the screening element is disposed between the second wastewater tank 52 and the neutralization buffer tank 60 to intercept graphite particles in the wastewater flowing out of the second outlet. Optionally, the screening element can be a fine screen to intercept fine-diameter graphite particles. Preferably, the fine screen particle size is ≥800 mesh.

[0037] In this embodiment, the graphite ink washing device further includes a water supply mechanism, which includes a tap water conveying mechanism 111 and a pure water conveying mechanism 112. The tap water conveying mechanism 111 is connected to the first water washing separator 11 of the first processing unit 10 and is used to supply water to the first processing unit 10. The pure water conveying mechanism 112 is connected to the third water washing separator 21 of the second processing unit 20 and is used to supply water to the second processing unit 20 and the third processing unit 30. By rationally configuring the water supply mechanism, the different water quality requirements of different washing stages are ensured, the washing efficiency is improved and the water consumption is reduced, thereby achieving efficient recycling of water resources. Specifically, the tap water conveying mechanism 111 can be connected to the first processing unit 10, so that the tap water conveying mechanism 111 can supply water to the first processing unit 10 to achieve material washing when there is not enough treated wastewater to return to the first processing unit 10 in the water tank 80. The pure water conveying mechanism 112 may include two pure water pipes. One pure water pipe is connected to the second processing mechanism 20. When there is not enough treated wastewater in the water tank 80 to flow back to the second processing mechanism 20, it supplies water to the second processing mechanism 20 to achieve water washing of the materials. The other pure water pipe is connected to the third processing mechanism 30. When there is not enough treated wastewater in the water tank 80 to flow back to the third processing mechanism 30, it supplies water to the third processing mechanism 30 to achieve water washing of the materials.

[0038] In this embodiment, the neutralization buffer tank 60 is equipped with a stirring device and an automatic dosing adjustment device to adjust the pH of the water. The neutralization buffer tank 60 can also be equipped with a pH monitoring device and a dynamic threshold alarm to monitor the pH value of the wastewater after neutralization. For example, in the water quality sampling layer of this embodiment, an alarm will be triggered if the pH value in the neutralization buffer tank 60 is greater than 9 or less than 6. If the pH value is greater than 9, acid adjustment solution will be added; if the pH value is less than 6, alkali adjustment solution will be added. The supernatant of the wastewater enters the buffer tank, is treated by the reverse osmosis treatment unit 70, and then enters the water tank 80. The water tank 80 is connected to the wastewater pipe 40 and flows back to the first treatment unit 10, the second treatment unit 20, and the third treatment unit 30 through the wastewater pipe 40, thereby enabling the treated wastewater to be used for material washing in the first treatment unit 10, the second treatment unit 20, and the third treatment unit 30. Optionally, the first water washing separator 11, the second water washing separator 13, the third water washing separator 21, the fourth water washing separator 23, and the fifth water washing separator 31 in this embodiment can all be configured as devices for solid-liquid separation, such as filter presses and centrifuges.

[0039] The graphite lithography washing device in this embodiment first uses a water washing separator, such as a filter press, to dealkalize the calcined material, removing most of the waste alkali and impurities. Then, the filter cake is slurried through a slurry tank and fed into another water washing separator, such as a centrifuge, for a second water washing. This water washing process is divided into two stages: the first stage involves collecting high-concentration impurity wastewater through a wastewater buffer tank 50, which is then treated and reused; the second stage involves collecting low-concentration impurity wastewater, which can be directly reused. The graphite lithography washing device in this embodiment involves wastewater reuse treatment in the following three steps. By recycling wastewater, the amount of water used for washing is reduced, thus lowering costs. This embodiment employs a multi-gradient water washing method to treat wastewater at different stages separately. Wastewater of varying concentrations is treated and reused separately. The first-stage washing water undergoes neutralization-membrane treatment for reuse. Through automatic adjustment, acidic and alkaline wastewater can be neutralized and further treated, enabling subsequent water treatment and reuse. For the second-stage wastewater, water quality monitoring devices are added during the washing process, including a water quality sampling layer, conductivity detectors, and dynamic threshold alarm devices, to monitor the wastewater in real time. Since the impurity content is low at this stage, the wastewater can be directly used for washing new materials through the reuse pipeline, reducing wastewater treatment costs and saving water consumption, thus achieving comprehensive wastewater utilization. Automatic adjustment and real-time monitoring enable the entire petroleum ink washing device to operate automatically, simplifying operation and effectively saving labor costs.

[0040] The usage process of the graphite ink washing device in this embodiment is as follows:

[0041] 1. The material is processed by the first processing unit 10: The material conveying pipeline transports the material to the first water washing separator 11. After processing in the first water washing separator 11, the concentrated acid solution is discharged from the first outlet of the first water washing separator 11 and enters the first wastewater tank 51 through the wastewater pipeline 40. Subsequently, the material enters the first pulping tank 12 to pulp the pressed spherical graphite. The material is then pumped into the second water washing separator 13 for water washing. The washing water used in this stage is tap water, the washing time in this stage is 20-30 minutes, and the washing water volume is 1-2 ml. 3At this stage, the washing water contains a large number of impurities. After flowing out of the second outlet of the second water washing separator 13, the water becomes wastewater. Optionally, the amount of material injected into the second water washing separator 13 each time can be 100 kg. A connecting valve, called the first connecting valve 101, can be installed between the second outlet and the second wastewater tank 52. When the first connecting valve 101 is open, the wastewater flowing out of the second outlet flows into the second wastewater tank 52 through the first connecting valve 101. The wastewater in the second wastewater tank 52 passes through the screening element and flows into the neutralization buffer tank 60 for neutralization treatment. Then, it undergoes membrane treatment through the reverse osmosis treatment mechanism 70. The wastewater after membrane treatment enters the water tank 80 and can finally be recycled back to the first treatment mechanism 10, the second treatment mechanism 20, and the third treatment mechanism 30.

[0042] 2. The material is processed by the second processing unit 20: The material conveying pipeline transports the material to the third water washing separator 21. Here, the material refers to the sample after the graphite reacts with alkali. The third water washing separator 21 presses the material and discharges the alkali solution through the third outlet. The pressed material enters the second pulping tank 22. After the second pulping tank 22 processes the material, it enters the fourth water washing separator 23. The pure water conveying mechanism 112 is connected to the fourth water washing separator 23 to provide pure water for the first stage of water washing in the second processing unit 20. The wastewater flows out from the fourth outlet and flows through the wastewater pipeline 40 to the third wastewater tank 53. The water washing time in this stage can be set to 30-40 minutes. During this stage of water washing, the alkali concentration is high and the impurity content in the wastewater is high. The fourth connecting valve 104 is closed and the second connecting valve 102 is opened to allow the wastewater to flow into the third wastewater tank 53. After flowing into the third wastewater tank 53, the wastewater then flows into the neutralization buffer tank 60 for neutralization treatment. A water quality sampling layer and a conductivity detector are installed at the fourth outlet to detect water quality and conductivity. When the set conditions of the water quality sampling layer and the conductivity detector are met, such as the water quality in this embodiment meeting the requirements of pH value less than 8 and conductivity less than 400 μS / cm, the water quality sampling layer and the conductivity detector provide feedback, the first stage of water washing in the second treatment mechanism 20 is completed, and the second stage of water washing begins. The second stage of water washing is still supplied by the pure water delivery mechanism 112. The water washing time in this stage can be set to 20-30 minutes. The wastewater in this stage flows out from the fourth outlet, controlling the second connecting valve 102 to close and the fourth connecting valve 104 to open, allowing the wastewater to flow into the water recycling mechanism 90, and then back to the first treatment structure and the second treatment mechanism 20 for recycling. Optionally, a first recycled water collection tank can be provided between the fourth connecting valve 104 and the recycled water mechanism 90. The first recycled water collection tank is connected to the fourth connecting valve 104 and the recycled water mechanism 90. When the fourth connecting valve 104 is opened, the wastewater flowing out from the fourth outlet can enter the first recycled water collection tank through the fourth connecting valve 104, then flow into the recycled water mechanism 90, and finally flow back to the first treatment mechanism 10 and the second treatment mechanism 20 for recycling.

[0043] 3. The material is processed by the third processing unit 30: The material conveying pipeline transports the material to the fifth water washing separator 31. The material here refers to the sample after the graphite processed by the second processing unit 20 reacts with the acid. The fifth water washing separator 31 performs the first stage of water washing on the material. The pure water conveying mechanism 112 is connected to the fifth water washing separator 31. The water washing time in this stage is 20-30 minutes. Similarly, the acid concentration is high and the impurity content in the wastewater is high in this stage. A third connecting valve 103 is installed between the fifth water washing separator 31 and the fourth wastewater tank 54. When the third connecting valve 103 is opened, the acidic wastewater in this stage enters the fourth wastewater tank 54 through the wastewater pipeline 40. The fourth wastewater tank 54 is connected to the neutralization buffer tank 60, thereby realizing the recycling of the treated wastewater. When the water quality sampling layer and conductivity detection device at the fifth outlet meet the requirements of pH value greater than 4 and conductivity less than 200 μS / cm, the third connecting valve 103 closes and the fifth connecting valve 105 opens. The first stage of water washing in the third treatment unit 30 is completed, and the second stage of water washing begins. The second stage of water washing continues through the pure water delivery pipeline. The water washing time in this stage is 20-30 minutes. The wastewater in this stage enters the recycled water unit 90 through the fifth connecting valve 105 and is directly returned to the first treatment unit 10 and the second treatment unit 20 through the return pipe 91 for recycling. Optionally, a second recycled water collection tank can be installed between the fifth connecting valve 105 and the recycled water mechanism 90. The second recycled water collection tank is connected to the fifth connecting valve 105 and the recycled water mechanism 90. When the fifth connecting valve 105 is opened, the wastewater flowing out from the fifth outlet can enter the second recycled water collection tank through the fifth connecting valve 105, then flow into the recycled water mechanism 90, and finally return to the first treatment mechanism 10, the second treatment mechanism 20, and the third treatment mechanism 30 for recycling.

[0044] It should be noted that "multiple" in the above embodiments refers to at least two.

[0045] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0046] 1. This solves the problem of high water consumption in graphite ink washing in existing technologies;

[0047] 2. By setting up a first treatment unit, a second treatment unit, a third treatment unit, and a total of multiple treatment units, all of which are connected to the wastewater pipeline, the graphite can undergo multiple gradient water washing processes, and the wastewater after multiple gradient water washing can be treated and reused, thereby reducing wastewater treatment costs and saving water resources.

[0048] 3. After the material is washed by multiple treatment units, the impurity ions after the graphite reaction can be effectively removed. All treatment units are connected to the wastewater pipeline, so that the wastewater after the graphite ink washing treatment can flow into the neutralization buffer tank and the reverse osmosis treatment unit for treatment. Moreover, the treated wastewater can be returned to the first, second and third treatment units, thereby realizing the treatment and reuse of wastewater, thereby reducing the water consumption in the graphite ink washing process and thus reducing costs.

[0049] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0050] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0051] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0052] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A graphite washing device, characterized by, include: Multiple processing units are used, and the material is washed sequentially through these multiple processing units. Wastewater pipes (40); Wastewater buffer tank (50), and multiple treatment units are respectively connected to the wastewater buffer tank (50) through the wastewater pipe (40) and discharge at least a portion of the wastewater into the wastewater buffer tank (50); Neutralization buffer tank (60), which is connected to the wastewater buffer tank (50), is used to neutralize the wastewater; A reverse osmosis treatment unit (70) is connected to the neutralization buffer tank (60) and is used to perform reverse osmosis treatment on the neutralized wastewater; A water tank (80) is connected to the reverse osmosis treatment unit (70) and to multiple treatment units respectively, for supplying liquid to the multiple treatment units.

2. The graphite washing apparatus according to claim 1, wherein The processing mechanism located at the first end among the plurality of processing mechanisms is the first processing mechanism (10), and the first processing mechanism (10) includes: A first water washing separator (11) has a first feed inlet, through which the material enters the first water washing separator (11); A first pulping tank (12) for pulping the material; The second water washing separator (13) is connected in sequence with the first water washing separator (11), the first pulping tank (12), and the second water washing separator (13). The first water washing separator (11) has a first water outlet, and the second water washing separator (13) has a second water outlet. Both the first water outlet and the second water outlet are connected to the wastewater buffer tank (50) and discharge the wastewater into the wastewater buffer tank (50).

3. The graphite washing apparatus according to claim 2, wherein The plurality of processing mechanisms further includes a second processing mechanism (20) disposed on one side of the first processing mechanism (10), the first processing mechanism (10) and the second processing mechanism (20) being in communication, the second processing mechanism (20) comprising: The third water washing separator (21) has a second feed inlet, through which the material enters the third water washing separator (21); A second pulping tank (22) for pulping the material; The fourth water washing separator (23) is connected in sequence with the third water washing separator (21), the second pulping tank (22), and the fourth water washing separator (23). The third water washing separator (21) has a third outlet, and the fourth water washing separator (23) has a fourth outlet. Both the third outlet and the fourth outlet are connected to the wastewater buffer tank (50) and discharge the wastewater into the wastewater buffer tank (50).

4. The graphite washing apparatus according to claim 3, wherein The plurality of processing units also include a third processing unit (30) disposed on one side of the second processing unit (20). The second processing unit (20) is connected to the third processing unit (30). The third processing unit (30) includes a fifth water washing separator (31). The fifth water washing separator (31) includes a fifth water outlet. The fifth water outlet is connected to the wastewater buffer tank (50) and discharges the wastewater into the wastewater buffer tank (50).

5. The graphite washing apparatus according to claim 4, wherein The graphite ink washing device also includes a water quality collection layer and a conductivity detection device. The water quality sampling layer and the conductivity detection device are located at the fourth water outlet; and / or The water quality sampling layer and the conductivity detection device are located at the fifth water outlet; and / or The water quality collection layer is located at the neutralization buffer tank (60).

6. The graphite washing apparatus according to claim 4, wherein The graphite ink washing device further includes a water recycling mechanism (90), which includes: A return pipe (91) is provided, one end of which is connected to the fourth outlet and the fifth outlet respectively, and the other end of which is connected to the first water washing separator (11) and the second water washing separator (13) of the first treatment mechanism (10), and to the third water washing separator (21) and the fourth water washing separator (23) of the second treatment mechanism (20); a return tank (92) is provided on the return pipe (91).

7. The graphite washing apparatus according to claim 6, wherein The graphite ink washing device further includes a connecting valve, the connecting valve comprising: The second connecting valve (102) is disposed between the fourth outlet and the wastewater buffer tank (50); The fourth connecting valve (104) is disposed on the return pipe (91) and between the fourth outlet and the return tank (92).

8. The graphite washing apparatus according to claim 6, wherein The graphite ink washing device further includes a connecting valve, the connecting valve comprising: The third connecting valve (103) is disposed between the fifth outlet and the wastewater buffer tank (50); The fifth connecting valve (105) is disposed on the return pipe (91) and between the fifth outlet and the return tank (92).

9. The graphite washing apparatus according to claim 4, wherein The graphite ink washing device further includes a water supply mechanism, which includes a tap water conveying mechanism (111) and a pure water conveying mechanism (112). The tap water conveying mechanism (111) is connected to the first water washing separator (11) of the first treatment mechanism (10) and is used to supply water to the first treatment mechanism (10). The pure water conveying mechanism (112) is connected to the third water washing separator (21) of the second treatment mechanism (20) and is used to supply water to the second treatment mechanism (20) and the third treatment mechanism (30).

10. The graphite washing device according to any one of claims 1 to 9, characterized in that, The graphite washing device also includes a screening element, which is disposed between the wastewater buffer tank (50) and the neutralization buffer tank (60) and intercepts graphite particles in the wastewater.

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