Extraction tank

Abstract

The utility model discloses an extraction tank. The extraction tank comprises a mixing chamber, a clarifying chamber and a separating chamber which are arranged in sequence, a first baffle is arranged between the mixing chamber and the clarifying chamber; a mixed phase outlet is formed in the first baffle. A second baffle is arranged between the clarifying chamber and the separation chamber, a light-phase overflow port and a heavy-phase overflow port are formed in the second baffle, the separation chamber comprises a light-phase separation chamber and a heavy-phase separation chamber, the light-phase overflow port is communicated with the light-phase separation chamber, the heavy-phase overflow port is communicated with the heavy-phase separation chamber, and the light-phase overflow port is located above the heavy-phase overflow port. N-1 movable partition plates are arranged in the clarifying chamber, the N-1 movable partition plates divide the clarifying chamber into a first clarifying chamber, a second clarifying chamber... and an Nth clarifying chamber, each movable partition plate is provided with a light phase circulation opening and a heavy phase circulation opening, and the light phase circulation opening is located above the heavy phase circulation opening. The multiple clarifying chambers are arranged, so that the mixed phase formed by mixing the water phase and the organic phase can be subjected to multi-stage clarifying separation, the separation effect can be improved, and the extraction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of extraction metallurgy, in particular to an extraction tank. Background Art

[0002] The working principle of the extraction tank is to mix the aqueous phase containing specific elements with the organic phase containing the extractant in a mixing chamber, and then overflow into the clarification chamber through an overflow device. Due to the density difference between the aqueous phase and the organic phase, phase separation is completed under the action of gravity. Under normal circumstances, a dispersion band will appear between the two phases. The aqueous phase will be deposited below the dispersion band, and the organic phase will gather above the dispersion band. The organic phase floating on the upper layer will enter the next-level extraction mixing chamber through the channel, while the aqueous phase will flow through the aqueous phase port below to the upper-level extraction tank for further extraction and purification. The extraction device used in the existing extraction process mainly consists of a mixing chamber and a clarification chamber as an extraction unit. The clarification tank generally has only one clarification chamber, the two-phase separation effect is poor, and the extraction efficiency is low.

[0003] Therefore, an extraction tank is urgently needed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide an extraction tank with good separation effect on a mixed liquid of an aqueous phase and an organic phase and high extraction efficiency.

[0005] As conceived above, the technical solution adopted by the present utility model is:

[0006] An extraction tank is provided, comprising a mixing chamber, a clarifying chamber and a separation chamber arranged in sequence;

[0007] The mixing chamber is used to accommodate a mixed phase, which is formed by mixing an aqueous phase and an organic phase. A mixed phase outlet is provided on a first baffle between the mixing chamber and the clarifying chamber.

[0008] The separation chamber includes a light phase separation chamber and a heavy phase separation chamber, a light phase overflow port and a heavy phase overflow port are provided on a second baffle between the clarification chamber and the separation chamber, the light phase overflow port is communicated with the light phase separation chamber, the heavy phase overflow port is communicated with the heavy phase separation chamber, and the light phase overflow port is located above the heavy phase overflow port; the light phase separation chamber is further provided with a light phase outlet, and the heavy phase separation chamber is provided with a heavy phase outlet;

[0009] The bottom wall of the clarification chamber is provided with a slag discharge port, and N-1 movable partitions are provided in the clarification chamber, and the N-1 movable partitions are used to divide the clarification chamber into a first clarification chamber, a second clarification chamber... and an Nth clarification chamber. A light phase flow port and a heavy phase flow port are provided on each of the movable partitions, and the light phase flow port is located above the heavy phase flow port.

[0010] Optionally, a baffle is provided in the first clarification chamber. The baffle abuts against two side walls of the first clarification chamber that are oppositely arranged in the horizontal direction, and there is a gap between the bottom wall of the first clarification chamber in the vertical direction and the baffle. Flow holes are provided on the baffle.

[0011] Optionally, a flow dividing member protrudes from the bottom wall of the clarification chamber. There are a plurality of the flow dividing members, and the plurality of flow dividing members are arranged at intervals along a first direction. Each flow dividing member includes a plurality of flow dividing sheets, and the plurality of flow dividing sheets are arranged at intervals along a second direction. The flow dividing sheets of two adjacent flow dividing members are arranged in a staggered manner. The first direction and the second direction are arranged at an angle, and the first direction is the flowing direction of the fluid in the extraction tank.

[0012] Optionally, the flow dividing sheet has a flow-facing surface and a back-flow surface, and the angle between the flow-facing surface and the horizontal plane is an obtuse angle.

[0013] Optionally, the bottom wall of the clarification chamber has a groove, and the groove extends along the first direction, and the first direction is the flowing direction of the fluid in the extraction tank.

[0014] Optionally, slag discharge ports are provided on the bottom walls of the first clarification chamber, the second clarification chamber,..., and the Nth clarification chamber.

[0015] Optionally, the light-phase flow port and the heavy-phase flow port have a first interval in the horizontal direction and a second interval in the vertical direction.

[0016] Optionally, a first bottom plate is provided in the mixing chamber. The first bottom plate divides the mixing chamber into a liquid inlet chamber and a confluence chamber. The liquid inlet chamber is located below the confluence chamber. Confluence holes are provided on the first bottom plate, and the liquid inlet chamber and the confluence chamber are communicated through the confluence holes;

[0017] The liquid inlet chamber includes a first liquid inlet chamber and a second liquid inlet chamber. An aqueous-phase inlet is provided on the chamber wall of the first liquid inlet chamber, and an organic-phase inlet is provided on the chamber wall of the second liquid inlet chamber. The mixed-phase outlet is communicated with the confluence chamber.

[0018] Optionally, a stirring device is provided in the confluence chamber. The stirring device is used for stirring the mixed phase, and the mixed phase is formed by mixing an aqueous phase and an organic phase.

[0019] Optionally, a second bottom plate is arranged in the heavy-phase separation chamber. The second bottom plate divides the heavy-phase separation chamber into an overflow chamber and an outlet chamber. The overflow chamber is located above the outlet chamber. An overflow pipe is arranged in the overflow chamber. One end of the overflow pipe is communicated with the outlet chamber, and the other end of the overflow pipe is communicated with the atmosphere. Overflow holes are arranged on the side wall of the overflow pipe. The overflow holes and the heavy-phase overflow port are both communicated with the overflow chamber. The heavy-phase outlet is communicated with the outlet chamber.

[0020] The beneficial effects of the present utility model are as follows:

[0021] The extraction tank proposed by the present utility model comprises a mixing chamber, a clarification chamber and a separation chamber which are arranged in sequence. There is a first baffle between the mixing chamber and the clarification chamber, and a mixed-phase outlet is arranged on the first baffle. There is a second baffle between the clarification chamber and the separation chamber, and a light-phase overflow port and a heavy-phase overflow port are arranged on the second baffle. The separation chamber comprises a light-phase separation chamber and a heavy-phase separation chamber. The light-phase overflow port is communicated with the light-phase separation chamber, and the heavy-phase overflow port is communicated with the heavy-phase separation chamber. The light-phase overflow port is located above the heavy-phase overflow port. And N-1 movable partitions are arranged in the clarification chamber. The N-1 movable partitions are used to divide the clarification chamber into a first clarification chamber, a second clarification chamber... and an Nth clarification chamber. Light-phase flow ports and heavy-phase flow ports are arranged on each movable partition, and the light-phase flow ports are located above the heavy-phase flow ports. During specific implementation, the aqueous phase and the organic phase can be respectively introduced into the mixing chamber and mixed in the mixing chamber to form a mixed phase, and then flow into the first clarification chamber through the mixed-phase outlet. The light phase suspended above in the first clarification chamber can flow into the second clarification chamber through the light-phase flow port, and the heavy phase located below in the first clarification chamber can flow into the second clarification chamber through the heavy-phase flow port, and so on, until the light phase and the heavy phase respectively flow into the Nth clarification chamber. The light phase in the Nth clarification chamber will also enter the light-phase separation chamber through the light-phase overflow port. A light-phase outlet is also arranged in the light-phase separation chamber, and the light-phase outlet is used to discharge the separated light phase out of the extraction tank. The heavy phase in the Nth clarification chamber enters the heavy-phase separation chamber through the heavy-phase overflow port. A heavy-phase outlet is also arranged in the heavy-phase separation chamber, and the heavy-phase outlet is used to discharge the separated heavy phase out of the extraction tank. And a slag discharge port is also arranged on the bottom wall of the clarification chamber, and the impurities precipitated in the clarification chamber can be discharged through the slag discharge port. The extraction tank proposed by the present utility model can make the mixed phase formed by the mixing of the aqueous phase and the organic phase undergo multi-stage clarification separation by arranging a plurality of clarification chambers, which can improve the separation effect and the extraction efficiency. In addition, during specific implementation, the number of clarification chambers can be set according to the characteristics of the extraction materials and the extraction requirements, and the extraction tanks can also be freely combined and connected in series according to the process requirements for multi-stage extraction and back-extraction. Description of the Drawings

[0022] Figure 1 is a perspective structure diagram of the extraction tank from the first perspective provided by the embodiment of the present utility model;

[0023] Figure 2It is a perspective structure diagram of the second view angle of the extraction tank provided by the embodiment of the present utility model.

[0024] In the figure:

[0025] 1. Mixing chamber; 101. Aqueous phase inlet; 102. Organic phase inlet; 103. Mixed phase outlet; 2. First clarification chamber; 201. Light phase flow port; 202. Heavy phase flow port; 203. Light phase overflow port; 204. Heavy phase overflow port; 3. Second clarification chamber; 4. Third clarification chamber; 5. Light phase separation chamber; 501. Light phase outlet; 6. Heavy phase separation chamber; 601. Heavy phase outlet;

[0026] 11. First baffle; 12. Second baffle; 13. Third baffle; 14. Movable partition; 15. Baffle plate; 151. Flow through hole; 16. Shunt piece; 161. Flow facing surface; 17. First bottom plate; 171. Confluence hole; 18. Second bottom plate; 19. Bottom wall; 191. Slag discharge port; 20. Stirring device;

[0027] 21. First liquid inlet chamber; 22. Second liquid inlet chamber; 23. Confluence chamber; 24. Overflow chamber; 241. Overflow pipe; 2411. Overflow hole; 25. Outlet chamber. Detailed implementation mode

[0028] To make the technical problems solved by the present utility model, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the present utility model will be further described below in conjunction with the drawings and through specific implementation modes. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all of them.

[0029] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0030] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left" and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] The technical solution of the present utility model will be further described below in conjunction with the drawings and through specific embodiments.

[0033] Such as Figure 1 and Figure 2As shown in the figure, the extraction tank provided in this embodiment includes a mixing chamber 1, a clarification chamber, and a separation chamber arranged in sequence. There is a first baffle 11 between the mixing chamber 1 and the clarification chamber, and a mixed-phase outlet 103 is provided on the first baffle 11. There is a second baffle 12 between the clarification chamber and the separation chamber, and a light-phase overflow port 203 and a heavy-phase overflow port 204 are provided on the second baffle 12. The separation chamber includes a light-phase separation chamber 5 and a heavy-phase separation chamber 6. The light-phase overflow port 203 is communicated with the light-phase separation chamber 5, and the heavy-phase overflow port 204 is communicated with the heavy-phase separation chamber 6. The light-phase overflow port 203 is located above the heavy-phase overflow port 204. And N - 1 movable partitions 14 are arranged in the clarification chamber. The N - 1 movable partitions 14 are used to divide the clarification chamber into a first clarification chamber 2, a second clarification chamber 3... and an Nth clarification chamber. A light-phase flow port 201 and a heavy-phase flow port 202 are provided on each movable partition 14, and the light-phase flow port 201 is located above the heavy-phase flow port 202. Specifically in implementation, the aqueous phase and the organic phase can be respectively introduced into the mixing chamber 1 and mixed in the mixing chamber 1 to form a mixed phase, and then flow into the first clarification chamber 2 through the mixed-phase outlet 103. The light phase suspended above in the first clarification chamber 2 can flow into the second clarification chamber 3 through the light-phase flow port 201, and the heavy phase located below in the first clarification chamber 2 can flow into the second clarification chamber 3 through the heavy-phase flow port 202, and so on, until the light phase and the heavy phase respectively flow into the Nth clarification chamber. In this embodiment, N = 3, that is, until the light phase and the heavy phase respectively flow into the third clarification chamber 4. The light phase in the third clarification chamber 4 will also enter the light-phase separation chamber 5 through the light-phase overflow port 203. A light-phase outlet 501 is also provided in the light-phase separation chamber 5. The light-phase outlet 501 is used to discharge the separated light phase from the extraction tank. The heavy phase in the third clarification chamber 4 will enter the heavy-phase separation chamber 6 through the heavy-phase overflow port 204. A heavy-phase outlet 601 is also provided in the heavy-phase separation chamber 6. The heavy-phase outlet 601 is used to discharge the separated heavy phase from the extraction tank. And a slag discharge port 191 is also provided on the bottom wall 19 of the clarification chamber. The impurities precipitated in the clarification chamber can be discharged through the slag discharge port 191. The extraction tank provided in this embodiment can make the mixed phase formed by the mixing of the aqueous phase and the organic phase undergo multi-stage clarification separation by arranging multiple clarification chambers, which can improve the separation effect and the extraction efficiency. In addition, specifically in implementation, the number of clarification chambers can be set according to the characteristics of the extraction materials and the extraction requirements, and the extraction tanks can also be freely combined and connected in series according to the process requirements for multi-stage extraction and back-extraction.

[0034] Optionally, the light-phase flow port 201 and the heavy-phase flow port 202 have a first interval in the horizontal direction and a second interval in the vertical direction. By increasing the distance between the light-phase flow port 201 and the heavy-phase flow port 202, the separation effect of the light phase and the heavy phase can be further improved.

[0035] Optionally, slag discharge ports 191 are provided on the bottom walls 19 of the first clarification chamber 2, the second clarification chamber 3, …… and the Nth clarification chamber, so that impurities precipitated at different positions in the clarification chamber can be quickly discharged from the clarification chamber.

[0036] Furthermore, a baffle plate 15 is provided in the first clarification chamber 2. The two side walls of the first clarification chamber 2 that are oppositely arranged in the horizontal direction are both in contact with the baffle plate 15. There is a gap between the bottom wall 19 of the first clarification chamber 2 in the vertical direction and the baffle plate 15. Flow-through holes 151 are provided on the baffle plate 15. The first baffle plate 15 is used to slow down the flow rate of the mixed phase, which is more conducive to the separation of the light phase and the heavy phase. Moreover, the fluid located above can flow through the baffle plate 15 through the flow-through holes 151, while the fluid below flows through the baffle plate 15 through the gap between the bottom wall 19 and the baffle plate 15. In specific implementation, the top surface of the baffle plate 15 is flush with the top surface of the first clarification chamber 2.

[0037] Even further, a flow dividing member is convexly provided on the bottom wall 19 of the clarification chamber. There are multiple flow dividing members, and the multiple flow dividing members are arranged at intervals along the first direction. Each flow dividing member includes multiple flow dividing sheets 16, and the multiple flow dividing sheets 16 are arranged at intervals along the second direction. The flow dividing sheets 16 of two adjacent flow dividing members are arranged in a staggered manner. The first direction and the second direction are arranged at an angle, and the first direction is the flow direction of the fluid in the extraction tank. With this setting, the multiple flow dividing sheets 16 are staggered on the bottom wall 19 of the clarification chamber, which can further disturb the flow of the mixed phase entering the clarification chamber, improve the mixing degree of the mixed phase, thereby ensuring the phase separation effect of the light phase and the heavy phase, improving the extraction recovery rate, and at the same time reducing the flow rate of the mixed phase entering the clarification chamber. Among them, the first direction is Figure 1 the ab direction in Figure 1 and the second direction is the cd direction in. In this embodiment, the first direction is perpendicular to the second direction.

[0038] Optionally, the flow dividing sheet 16 has a flow-facing surface 161 and a back flow surface, and the angle between the flow-facing surface 161 and the horizontal plane is an obtuse angle. When the fluid flows through the flow dividing sheet 16, the inclined flow-facing surface 161 can better disperse the fluid and also avoid the formation of dead corners between the flow-facing surface 161 and the bottom wall 19, which hinders the fluid mixing.

[0039] Optionally, the bottom wall 19 of the clarification chamber has a groove, and the groove extends along the first direction, and the first direction is the flow direction of the fluid in the extraction tank. The setting of the groove is more conducive to precipitating the impurities of the heavy phase to improve the phase separation effect of the mixed phase. In this embodiment, the bottom wall 19 of the clarification chamber is U-shaped.

[0040] Optionally, a first bottom plate 17 is arranged in the mixing chamber 1. The first bottom plate 17 divides the mixing chamber 1 into a liquid inlet chamber and a confluence chamber 23. The liquid inlet chamber is located below the confluence chamber 23. A confluence hole 171 is arranged on the first bottom plate 17. The liquid inlet chamber and the confluence chamber 23 are communicated through the confluence hole 171. The liquid inlet chamber includes a first liquid inlet chamber 21 and a second liquid inlet chamber 22. An aqueous phase inlet 101 is arranged on the chamber wall of the first liquid inlet chamber 21. An organic phase inlet 102 is arranged on the chamber wall of the second liquid inlet chamber 22. A mixed phase outlet 103 is communicated with the confluence chamber 23. That is, the aqueous phase needs to enter the first liquid inlet chamber 21 through the aqueous phase inlet 101, and the organic phase needs to enter the second liquid inlet chamber 22 through the organic phase inlet 102. When the fluids in the first liquid inlet chamber 21 and the second liquid inlet chamber 22 overflow to the upper confluence chamber 23, they need to be mixed through the confluence hole 171.

[0041] Optionally, a stirring device 20 is arranged in the confluence chamber 23. The stirring device 20 is used for stirring the mixed phase. The mixed phase is formed by mixing the aqueous phase and the organic phase. Under the action of stirring, better mixing of the aqueous phase and the organic phase can be achieved.

[0042] Optionally, a second bottom plate 18 is arranged in the heavy phase separation chamber 6. The second bottom plate 18 divides the heavy phase separation chamber 6 into an overflow chamber 24 and an outlet chamber 25. The overflow chamber 24 is located above the outlet chamber 25. An overflow pipe 241 is arranged in the overflow chamber 24. The first end of the overflow pipe 241 is communicated with the outlet chamber 25. The second end of the overflow pipe 241 is communicated with the atmosphere. An overflow hole 2411 is arranged on the side wall of the overflow pipe 241. The overflow hole 2411 and the heavy phase overflow port 204 are both communicated with the overflow chamber 24. A heavy phase outlet 601 is communicated with the outlet chamber 25. That is, after the clarified heavy phase flows into the overflow chamber 24 from the heavy phase overflow port 204, it still needs to flow into the overflow pipe 241 through the overflow hole 2411, then flow into the outlet chamber 25 through the first end of the overflow pipe 241, and finally be discharged through the heavy phase outlet 601 of the outlet chamber 25 to further filter impurities in the heavy phase.

[0043] The above embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, there are various changes and modifications to the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. Extraction tank, characterized in that, It includes a mixing chamber (1), a clarification chamber, and a separation chamber arranged in sequence; The mixing chamber (1) is used to accommodate a mixed phase formed by mixing an aqueous phase and an organic phase. A mixed phase outlet (103) is provided on a first baffle (11) between the mixing chamber (1) and the clarification chamber; The separation chamber includes a light phase separation chamber (5) and a heavy phase separation chamber (6). A light phase overflow port (203) and a heavy phase overflow port (204) are provided on a second baffle (12) between the clarification chamber and the separation chamber. The light phase overflow port (203) is communicated with the light phase separation chamber (5), and the heavy phase overflow port (204) is communicated with the heavy phase separation chamber (6). The light phase overflow port (203) is located above the heavy phase overflow port (204); A light phase outlet (501) is further provided in the light phase separation chamber (5), and a heavy phase outlet (601) is provided in the heavy phase separation chamber (6); A slag discharge port (191) is provided on the bottom wall (19) of the clarification chamber. N - 1 movable partitions (14) are provided in the clarification chamber. The N - 1 movable partitions (14) are used to divide the clarification chamber into a first clarification chamber (2), a second clarification chamber (3),..., and an Nth clarification chamber. A light phase circulation port (201) and a heavy phase circulation port (202) are provided on each of the movable partitions (14). The light phase circulation port (201) is located above the heavy phase circulation port (202).

2. The extraction tank according to claim 1, wherein A baffle plate (15) is provided in the first clarification chamber (2). Two side walls of the first clarification chamber (2) oppositely arranged in the horizontal direction are both in contact with the baffle plate (15). The bottom wall (19) of the first clarification chamber (2) in the vertical direction is spaced from the baffle plate (15). A circulation hole (151) is provided on the baffle plate (15).

3. The extraction tank according to claim 1, characterized in that, A flow dividing member is convexly provided on the bottom wall (19) of the clarification chamber. There are a plurality of the flow dividing members, and the plurality of flow dividing members are arranged at intervals along a first direction. Each flow dividing member includes a plurality of flow dividing sheets (16), and the plurality of flow dividing sheets (16) are arranged at intervals along a second direction. The flow dividing sheets (16) of two adjacent flow dividing members are arranged in a staggered manner. The first direction and the second direction are arranged at an angle. The first direction is the flowing direction of the fluid in the extraction tank.

4. The extraction tank according to claim 3, characterized in that, The flow dividing sheet (16) has a flow - facing surface (161) and a back - flow surface, and the angle between the flow - facing surface (161) and the horizontal plane is an obtuse angle.

5. The extraction tank according to claim 1, characterized in that The bottom wall (19) of the clarification chamber has a groove, and the groove extends along the first direction. The first direction is the flowing direction of the fluid in the extraction tank.

6. The extraction tank according to claim 1, characterized in that, Slag discharge ports (191) are provided on the bottom walls (19) of the first clarification chamber (2), the second clarification chamber (3),..., and the Nth clarification chamber.

7. The extraction tank according to claim 1, wherein, The light phase circulation port (201) and the heavy phase circulation port (202) have a first interval in the horizontal direction and a second interval in the vertical direction.

8. The extraction tank according to claim 1, characterized in that, A first bottom plate (17) is arranged in the mixing chamber (1). The first bottom plate (17) divides the mixing chamber (1) into a liquid inlet chamber and a confluence chamber (23). The liquid inlet chamber is located below the confluence chamber (23). A confluence hole (171) is arranged on the first bottom plate (17). The liquid inlet chamber and the confluence chamber (23) are communicated through the confluence hole (171). The liquid inlet chamber includes a first liquid inlet chamber (21) and a second liquid inlet chamber (22). An aqueous phase inlet (101) is arranged on the chamber wall of the first liquid inlet chamber (21). An organic phase inlet (102) is arranged on the chamber wall of the second liquid inlet chamber (22). The mixed phase outlet (103) is communicated with the confluence chamber (23).

9. The extraction tank according to claim 8, wherein, A stirring device (20) is arranged in the confluence chamber (23). The stirring device (20) is used for stirring the mixed phase, and the mixed phase is formed by mixing the aqueous phase and the organic phase.

10. The extraction tank according to claim 1, characterized in that, A second bottom plate (18) is arranged in the heavy phase separation chamber (6). The second bottom plate (18) divides the heavy phase separation chamber (6) into an overflow chamber (24) and an outlet chamber (25). The overflow chamber (24) is located above the outlet chamber (25). An overflow pipe (241) is arranged in the overflow chamber (24). One end of the overflow pipe (241) is communicated with the outlet chamber (25), and the other end of the overflow pipe (241) is communicated with the atmosphere. An overflow hole (2411) is arranged on the side wall of the overflow pipe (241). The overflow hole (2411) and the heavy phase overflow port (204) are both communicated with the overflow chamber (24). The heavy phase outlet (601) is communicated with the outlet chamber (25).

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