An extraction tank for promoting oil-water separation

Abstract

The utility model provides a kind of extraction tank for promoting oil-water separation, the tank body of extraction tank includes sequentially communicating along feed liquid flow direction mixed stirring chamber, first clarifying chamber, second clarifying chamber, third clarifying chamber, fourth clarifying chamber and fifth clarifying chamber;The mixed stirring chamber is separated with first clarifying chamber by baffle plate arrangement;Between the first clarifying chamber to third clarifying chamber, the connecting clarifying chamber is separated by baffle plate arrangement;Between the third clarifying chamber to fifth clarifying chamber, the connecting clarifying chamber is separated by demulsification filtering device arrangement.The extraction tank provided by the utility model can improve oil-water separation efficiency, shorten phase separation time, reduce the amount of extractant, while reducing equipment investment cost.

Description

[0001] This application claims priority to patent application number 2025204808622 (the earlier application was filed on March 19, 2025, and its utility model title is "An Extraction Tank for Promoting Oil-Water Separation"). Technical Field

[0002] This utility model relates to the field of extraction equipment technology, specifically to an extraction tank that promotes oil-water separation. Background Technology

[0003] With the development of the battery-grade lithium carbonate industry, the treatment of wastewater generated during its production process is a crucial issue that needs to be addressed. The lithium ion concentration in this wastewater is typically 1.2-2 g / L, indicating high recovery value. Currently, extraction is a commonly used method for lithium ion recovery. In this process, the compatibility between the extractant and the extraction equipment determines the effectiveness of lithium recovery.

[0004] In practical applications, box-type extraction equipment is a commonly used extraction device, used to transfer lithium ions between different liquid phases and ultimately obtain a high-quality lithium-containing solution. However, existing extraction tanks often fail to achieve efficient oil-water separation, resulting in low extraction efficiency, large amounts of extractant used, and high construction investment costs.

[0005] For example, CN102851493A discloses a clarification and separation extraction tank, including a mixing tank and a clarification tank, with a baffle between them. The volume ratio of the mixing tank to the clarification tank is 1:(1-1.4). The mixing tank has an organic phase inlet at the top and an aqueous phase inlet at the bottom. A mixing tank stirring shaft and stirring blades are located in the center of the mixing tank. The clarification tank has an organic phase outlet at the top and an aqueous phase outlet at the bottom. A clarification tank stirring shaft and stirring blades are also located in the center of the clarification tank. An overflow port is provided on the baffle. However, in practical applications, if the feed volume increases, the residence time in the clarification tank becomes insufficient, leading to an increase in the equipment's footprint.

[0006] CN114130065A discloses a dual-stirring mixing and clarifying extraction tank, comprising: a mixing chamber and a clarifying chamber. A first stirring device is installed in the mixing chamber, and a second stirring device is installed in the clarifying chamber. The stirring blade of the second stirring device is positioned at the oil-water mixing interface in the clarifying chamber. The stirring speed of the second stirring device is 1 rpm-20 rpm. The stirring blade of the second stirring device is one of a two-bladed straight blade, a four-bladed straight blade, a six-bladed straight blade, a two-bladed inclined blade, a four-bladed inclined blade, or a six-bladed inclined blade. However, this extraction tank suffers from complex equipment structure and high energy consumption costs.

[0007] Therefore, providing an extraction tank that can achieve efficient oil-water separation, thereby reducing the amount of extractant used and lowering equipment investment costs, is a technical problem that needs to be solved. Utility Model Content

[0008] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an extraction tank that promotes oil-water separation. The extraction tank can improve the oil-water separation efficiency, shorten the phase separation time, reduce the amount of extractant used, and reduce the equipment investment cost.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] This utility model provides an extraction tank for promoting oil-water separation. The tank body includes a mixing and stirring chamber, a first clarification chamber, a second clarification chamber, a third clarification chamber, a fourth clarification chamber, and a fifth clarification chamber that are connected sequentially along the flow direction of the liquid.

[0011] The mixing chamber and the first clarification chamber are separated by a baffle plate;

[0012] The first to the third clarification chambers are separated by baffles.

[0013] The third to fifth clarification chambers are separated by a demulsification filter device.

[0014] In the extraction tank provided by this utility model, the baffle plate can change the flow direction of the fluid, so that the fluid forms a tortuous flow path between the mixing chamber and the clarification chamber, reducing the potential energy of the fluid entering the clarification chamber and making the fluid in the clarification chamber more stable, thereby improving the two-phase separation efficiency; the demulsification and filtration device can separate the oil and water phases by breaking the stability of the emulsion, and can reduce entrainment through filtration, making the phase separation more stable, ultimately significantly improving the separation efficiency and stability of the extraction tank.

[0015] In this invention, a stirring device is provided in the mixing chamber. The stirring device is used to promote the full mixing of the aqueous phase and the oil phase, thereby ensuring the extraction effect.

[0016] Preferably, a first baffle is provided between the mixing chamber and the first clarification chamber; the first baffle is provided perpendicular to the bottom of the mixing chamber; the bottom of the first baffle is connected to the bottom of the mixing chamber; the top of the first baffle and the top of the mixing chamber form a first overflow outlet; the first overflow outlet is connected to the first clarification chamber.

[0017] Preferably, the top of the mixing chamber is provided with an aqueous phase inlet and an oil phase inlet; the top of the fifth clarification chamber is provided with an oil phase outlet and the bottom is provided with an aqueous phase outlet.

[0018] Preferably, a second baffle is provided between the first clarification chamber and the second clarification chamber; the second baffle is provided perpendicular to the top of the first clarification chamber; the top of the second baffle is connected to the top of the first clarification chamber; the bottom of the second baffle and the bottom of the first clarification chamber form a flow guide outlet; the flow guide outlet is in communication with the second clarification chamber.

[0019] Preferably, the distance between the bottom of the second baffle and the bottom of the first clarifier is 100-500mm, for example, it can be 100mm, 200mm, 300mm, 400mm or 500mm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0020] In this invention, by optimally controlling the gap between the bottom of the second baffle plate and the bottom of the first clarification chamber, it is possible to avoid blockage in the extraction tank due to an excessively small gap, and to avoid a short residence time and poor phase separation effect due to an excessively large gap.

[0021] Preferably, a third baffle is provided between the second clarification chamber and the third clarification chamber; the third baffle is provided perpendicular to the bottom of the second clarification chamber; the bottom of the third baffle is connected to the bottom of the second clarification chamber; the top of the third baffle and the top of the second clarification chamber form a second overflow outlet; the second overflow outlet is connected to the third clarification chamber.

[0022] Preferably, a first demulsification filter is provided between the third clarification chamber and the fourth clarification chamber; the top of the first demulsification filter is connected to the top of the third clarification chamber, and the bottom of the first demulsification filter is connected to the bottom of the third clarification chamber.

[0023] Preferably, a second demulsifying filter is provided between the fourth clarification chamber and the fifth clarification chamber; the top of the second demulsifying filter is connected to the top of the fourth clarification chamber, and the bottom of the second demulsifying filter is connected to the bottom of the fourth clarification chamber.

[0024] Preferably, the first demulsifying filter and the second demulsifying filter each independently include a porous structure; the porous structure includes a screen or a screen plate.

[0025] Preferably, the pore size of the porous structure is 0.1-2 mm, for example, it can be 0.1 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm or 2 mm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0026] The extraction tank provided by this utility model is used for the extraction and recovery of lithium from waste liquid. The operation process is as follows:

[0027] The aqueous phase (containing lithium solution) and the oil phase (extractant) are fed into the mixing and stirring chamber from the aqueous phase inlet and the oil phase inlet, respectively. The stirring device ensures that the aqueous phase and the oil phase are fully mixed, ensuring contact and mass transfer between the two phases. The mixed liquid enters the first clarification chamber through the first overflow outlet above the first baffle plate.

[0028] In the first clarification chamber, the flow rate of the material slows down, and it flows downward under the action of the baffle. In order to reduce the tumbling of the fluid in the first clarification chamber, the fluid enters the second clarification chamber through the guide outlet of the second baffle. In the second clarification chamber, the potential energy of the fluid is basically eliminated. Due to the difference in density between oil and water, the oil and water phases gradually begin to separate, with the oil phase floating and the water phase sinking. Then, it enters the third clarification chamber through the second overflow outlet above the third baffle. In the third clarification chamber, the phase separation effect is further enhanced, with a large number of oil-in-water or water-in-oil situations. The mixed liquid then passes through the first demulsification filter and the second demulsification filter in sequence, which shears the liquid containing the oil and water into fine droplets, thereby quickly achieving phase separation, improving the oil-water separation efficiency, and shortening the phase separation time. Finally, in the fifth clarification chamber, the lithium-rich oil phase and the raffinate are discharged from the oil phase outlet and the water phase outlet, respectively.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] In the extraction tank provided by this utility model, the flow direction of the fluid is changed by the setting of the baffle plate, which reduces the potential energy of the fluid entering the clarification chamber, making it easier for the fluid in the clarification chamber to separate into two phases and improving the separation efficiency of the two phases. By setting the demulsification filter device, the liquid in which oil and water are mutually inclusive can be sheared into fine droplets, thereby quickly achieving phase separation and shortening the phase separation time. Ultimately, the extraction tank can achieve an effective oil-water separation of more than 98%. Compared with the traditional box-type extraction tank, it can shorten the phase separation time by more than 60%, reduce the floor space of the extraction tank by more than 50%, and reduce the amount of extractant by more than 50%. Attached Figure Description

[0031] Figure 1 This is a longitudinal cross-sectional schematic diagram of the extraction tank provided in Embodiment 1 of this utility model;

[0032] In the diagram: 1-Mixing chamber; 2-First clarification chamber; 3-Second clarification chamber; 4-Third clarification chamber; 5-Fourth clarification chamber; 6-Fifth clarification chamber; 7-Agitator; 8-First baffle; 9-First overflow outlet; 10-Water phase inlet; 11-Oil phase inlet; 12-Oil phase outlet; 13-Water phase outlet; 14-Second baffle; 15-Guide outlet; 16-Third baffle; 17-Second overflow outlet; 18-First demulsification filter; 19-Second demulsification filter. Detailed Implementation

[0033] It should be understood that in the description of this utility model, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] In one specific implementation, such as Figure 1 As shown, this utility model provides an extraction tank for promoting oil-water separation. The tank body includes a mixing and stirring chamber 1, a first clarification chamber 2, a second clarification chamber 3, a third clarification chamber 4, a fourth clarification chamber 5, and a fifth clarification chamber 6 that are connected sequentially along the flow direction of the liquid.

[0037] The mixing chamber 1 and the first clarification chamber 2 are separated by a baffle plate;

[0038] The first clarification chamber 2 to the third clarification chamber 4 are separated by baffles.

[0039] The third clarification chamber 4 to the fifth clarification chamber 6 are separated by a demulsification filter device.

[0040] In the extraction tank provided by this utility model, the baffle plate can change the flow direction of the fluid, so that the fluid forms a tortuous flow path between the mixing chamber 1 and the clarification chamber, reducing the potential energy of the fluid entering the clarification chamber and making the fluid in the clarification chamber more stable, thereby improving the two-phase separation efficiency; the demulsification and filtration device can separate the oil and water phases by breaking the stability of the emulsion, and can reduce entrainment through filtration, making the phase separation more stable, and ultimately significantly improving the separation efficiency and stability of the extraction tank.

[0041] In this invention, a stirring device 7 is provided in the mixing chamber 1. The stirring device 7 is used to promote the full mixing of the aqueous phase and the oil phase to ensure the extraction effect.

[0042] Furthermore, a first baffle plate 8 is provided between the mixing chamber 1 and the first clarification chamber 2; the first baffle plate 8 is provided perpendicular to the bottom of the mixing chamber 1; the bottom of the first baffle plate 8 is connected to the bottom of the mixing chamber 1; the top of the first baffle plate 8 and the top of the mixing chamber 1 form a first overflow outlet 9; the first overflow outlet 9 is connected to the first clarification chamber 2.

[0043] In this invention, the first baffle plate 8 is arranged perpendicular to the direction of fluid flow, which reduces the kinetic energy of the fluid and makes it easier for the oil phase and water phase to separate in the extraction tank. At the same time, affected by the first baffle plate 8, the fluid flows downward, reducing turbulence in the first clarification chamber 2. The first baffle plate 8 is generally set according to the positions of the oil phase inlet 11 and the water phase inlet 10 in the extraction tank, thereby ensuring that the fluid can be fully and uniformly mixed in the mixing chamber 1. For example, the distance between the oil phase inlet 11 and the water phase inlet 10 and the first baffle plate 8 is set to 300 mm.

[0044] Furthermore, the top of the mixing chamber 1 is provided with a water phase inlet 10 and an oil phase inlet 11; the top of the fifth clarification chamber 6 is provided with an oil phase outlet 12 and the bottom is provided with a water phase outlet 13.

[0045] Furthermore, a second baffle plate 14 is provided between the first clarification chamber 2 and the second clarification chamber 3; the second baffle plate 14 is provided perpendicular to the top of the first clarification chamber 2; the top of the second baffle plate 14 is connected to the top of the first clarification chamber 2; the bottom of the second baffle plate 14 and the bottom of the first clarification chamber 2 form a guide outlet 15; the guide outlet 15 is connected to the second clarification chamber 3.

[0046] In this invention, the preferred arrangement of the second baffle 14 can further reduce the kinetic energy of the fluid and change its flow direction. After passing through the second baffle 14, the kinetic energy of the fluid is basically eliminated. At this point, due to the density difference between oil and water, they begin to gradually separate into oil and water phases. The oil, due to its relatively lower density, begins to flow upward, while the water phase, due to its relatively higher density, flows downward.

[0047] Furthermore, the distance between the bottom of the second baffle 14 and the bottom of the first clarifier 2 is 100-500mm, for example, it can be 100mm, 200mm, 300mm, 400mm or 500mm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0048] In this invention, by optimally controlling the distance between the bottom of the second baffle plate 14 and the bottom of the first clarification chamber 2, it is possible to prevent deposited sludge from causing blockage and affecting the normal operation of the extraction tank, while ensuring the fluid residence time and improving the phase separation effect.

[0049] Furthermore, a third baffle plate 16 is provided between the second clarification chamber 3 and the third clarification chamber 4; the third baffle plate 16 is provided perpendicular to the bottom of the second clarification chamber 3; the bottom of the third baffle plate 16 is connected to the bottom of the second clarification chamber 3; the top of the third baffle plate 16 and the top of the second clarification chamber 3 form a second overflow outlet 17; the second overflow outlet 17 is connected to the third clarification chamber 4.

[0050] In this invention, by preferably setting a third baffle plate 16, phase separation can be further promoted, the phase separation effect can be improved, and the flow rate can be made more stable.

[0051] Furthermore, a first demulsifying filter 18 is provided between the third clarification chamber 4 and the fourth clarification chamber 5; the top of the first demulsifying filter 18 is connected to the top of the third clarification chamber 4, and the bottom of the first demulsifying filter 18 is connected to the bottom of the third clarification chamber 4.

[0052] In this invention, the first demulsification filter 18 is preferably provided because when oil and water phases are generated, a large amount of oil-in-water or water-in-oil occurs, and the oil-water separation efficiency is still not high. By providing the first demulsification filter 18 during the flow of the oil-water mixed liquid, the liquid that is mutually inclusive of oil and water can be sheared into fine droplets after passing through the demulsification filter. The fine droplets can quickly achieve oil-water phase separation and shorten the phase separation time.

[0053] Furthermore, a second demulsifying filter 19 is provided between the fourth clarification chamber 5 and the fifth clarification chamber 6; the top of the second demulsifying filter 19 is connected to the top of the fourth clarification chamber 5, and the bottom of the second demulsifying filter 19 is connected to the bottom of the fourth clarification chamber 5.

[0054] In this invention, by preferably providing a second demulsification filter device 19, the remaining small amount of oil-in-water or water-in-oil liquid can be further promoted to promote phase separation, thereby improving the oil-water separation efficiency.

[0055] In this invention, the distance between the first demulsifying filter device 18 and the second demulsifying filter device 19 can be selected as needed. Generally, the residence time of the fluid between the two demulsifying filters needs to be fully considered. For example, the distance can be controlled so that the residence time reaches 3-4 minutes.

[0056] Furthermore, the first demulsifying filter device 18 and the second demulsifying filter device 19 each independently include a porous structure; the porous structure includes a screen or a screen plate.

[0057] Furthermore, the pore size of the porous structure is 0.1-2mm, for example, it can be 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm or 2mm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0058] Example 1

[0059] This embodiment provides an extraction tank that promotes oil-water separation, such as... Figure 1 As shown, the extraction tank includes a mixing and stirring chamber 1, a first clarification chamber 2, a second clarification chamber 3, a third clarification chamber 4, a fourth clarification chamber 5, and a fifth clarification chamber 6 connected sequentially along the flow direction of the liquid. The top of the mixing and stirring chamber 1 is provided with an aqueous phase inlet 10 and an oil phase inlet 11. The top of the fifth clarification chamber 6 is provided with an oil phase outlet 12 and the bottom is provided with an aqueous phase outlet 13. A stirring device 7 is provided inside the mixing and stirring chamber 1.

[0060] A first baffle plate 8 is provided between the mixing chamber 1 and the first clarification chamber 2. The first baffle plate 8 is provided perpendicular to the bottom of the mixing chamber 1, and its bottom is connected to the bottom of the mixing chamber 1. Its top is connected to the top of the mixing chamber 1 to form a first overflow outlet 9. The first overflow outlet 9 is connected to the first clarification chamber 2.

[0061] A second baffle plate 14 is provided between the first clarification chamber 2 and the second clarification chamber 3. The second baffle plate 14 is provided perpendicular to the top of the first clarification chamber 2, and its top is connected to the top of the first clarification chamber 2. Its bottom is connected to the bottom of the first clarification chamber 2 to form a guide outlet 15. The guide outlet 15 is connected to the second clarification chamber 3. The distance between the bottom of the second baffle plate 14 and the bottom of the first clarification chamber 2 is 300mm.

[0062] A third baffle plate 16 is provided between the second clarification chamber 3 and the third clarification chamber 4. The third baffle plate 16 is provided perpendicular to the bottom of the second clarification chamber 3, and its bottom is connected to the bottom of the second clarification chamber 3. Its top is connected to the top of the second clarification chamber 3 to form a second overflow outlet 17. The second overflow outlet 17 is connected to the third clarification chamber 4.

[0063] A first demulsification filter 18 is provided between the third clarification chamber 4 and the fourth clarification chamber 5, with its top connected to the top of the third clarification chamber 4 and its bottom connected to the bottom of the third clarification chamber 4. A second demulsification filter 19 is provided between the fourth clarification chamber 5 and the fifth clarification chamber 6, with its top connected to the top of the fourth clarification chamber 5 and its bottom connected to the bottom of the fourth clarification chamber 5. Both the first demulsification filter 18 and the second demulsification filter 19 are sieve plates with a pore size of 1 mm.

[0064] The extraction tank provided in this embodiment is used for the extraction and recovery of lithium from waste liquid. The operation process is as follows:

[0065] The aqueous phase (containing lithium solution) and the oil phase (extractant) are fed into the mixing chamber 1 through the aqueous phase inlet 10 and the oil phase inlet 11, respectively. The stirring device 7 ensures that the aqueous phase and the oil phase are fully mixed, ensuring contact and mass transfer between the two phases. The mixed liquid enters the first clarification chamber 2 through the first overflow outlet 9 above the first baffle plate 8.

[0066] In the first clarification chamber 2, the flow rate of the material slows down, and it flows downward under the action of the baffle. In order to reduce the tumbling of the fluid in the first clarification chamber 2, the fluid enters the second clarification chamber 3 through the guide outlet 15 of the second baffle 14. In the second clarification chamber 3, the potential energy of the fluid is basically eliminated. Due to the difference in density between oil and water, the oil and water phases gradually begin to separate, with the oil phase floating and the water phase sinking. Then, it enters the third clarification chamber 4 through the second overflow outlet 17 above the third baffle 16. In the third clarification chamber 4, the phase separation effect is further enhanced, with a large number of oil-in-water or water-in-oil situations. Then, the mixed liquid passes through the first demulsification filter 18 and the second demulsification filter 19 in sequence, so that the liquid containing the oil and water is sheared into fine droplets, thereby quickly achieving phase separation, improving the oil-water separation efficiency, and shortening the phase separation time. Finally, in the fifth clarification chamber 6, the lithium-rich oil phase and the raffinate are discharged from the oil phase outlet 12 and the water phase outlet 13, respectively.

[0067] In summary, the extraction tank provided by this utility model can improve oil-water separation efficiency, shorten phase separation time, reduce the amount of extractant used, and reduce equipment investment costs.

[0068] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. An extraction tank for promoting oil-water separation, characterized in that, The extraction tank includes a mixing chamber, a first clarification chamber, a second clarification chamber, a third clarification chamber, a fourth clarification chamber, and a fifth clarification chamber that are connected sequentially along the direction of liquid flow. The mixing chamber and the first clarification chamber are separated by a baffle plate; The first to the third clarification chambers are separated by baffles. The third to fifth clarification chambers are separated by a demulsification filter device.

2. The extraction tank for promoting oil-water separation according to claim 1, characterized in that, A first baffle is provided between the mixing chamber and the first clarification chamber; The first baffle is positioned perpendicular to the bottom of the mixing chamber; The bottom of the first baffle is connected to the bottom of the mixing chamber; The top of the first baffle plate and the top of the mixing chamber form a first overflow outlet; The first overflow outlet is connected to the first clarification chamber.

3. The extraction tank for promoting oil-water separation according to claim 1, characterized in that, The top of the mixing chamber is provided with an aqueous phase inlet and an oil phase inlet; The fifth clarification chamber is provided with an oil phase outlet at the top and an aqueous phase outlet at the bottom.

4. The extraction tank for promoting oil-water separation according to claim 1, characterized in that, A second baffle is provided between the first clarification chamber and the second clarification chamber; The second baffle is disposed perpendicular to the top of the first clarification chamber; The top of the second baffle is connected to the top of the first clarifier. The bottom of the second baffle plate and the bottom of the first clarification chamber form a flow outlet; The flow outlet is connected to the second clarification chamber.

5. The extraction tank for promoting oil-water separation according to claim 4, characterized in that, The distance between the bottom of the second baffle and the bottom of the first clarifier is 100-500mm.

6. The extraction tank for promoting oil-water separation according to claim 1, characterized in that, A third baffle is provided between the second clarification chamber and the third clarification chamber; The third baffle is arranged perpendicular to the bottom of the second clarification chamber; The bottom of the third baffle is connected to the bottom of the second clarification chamber; The top of the third baffle plate and the top of the second clarification chamber form a second overflow outlet; The second overflow outlet is connected to the third clarification chamber.

7. The extraction tank for promoting oil-water separation according to claim 1, characterized in that, A first demulsification filter is provided between the third clarification chamber and the fourth clarification chamber; The top of the first demulsifying filter is connected to the top of the third clarification chamber, and the bottom of the first demulsifying filter is connected to the bottom of the third clarification chamber.

8. The extraction tank for promoting oil-water separation according to claim 7, characterized in that, A second demulsifying filter is provided between the fourth clarification chamber and the fifth clarification chamber; The top of the second demulsifying filter is connected to the top of the fourth clarification chamber, and the bottom of the second demulsifying filter is connected to the bottom of the fourth clarification chamber.

9. The extraction tank for promoting oil-water separation according to claim 8, characterized in that, The first demulsifying filter and the second demulsifying filter each independently include a porous structure; The porous structure includes a sieve or a sieve plate.

10. The extraction tank for promoting oil-water separation according to claim 9, characterized in that, The pore size of the porous structure is 0.1-2 mm.

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