A high-efficiency separation device and process for refining waste mineral oil

Abstract

The invention relates to the technical field of waste mineral oil processing, and discloses a high-efficiency separation device for refining waste mineral oil and a process thereof, comprising a dilution tank, wherein a feed port is installed on the top of the dilution tank, a discharge port is installed on the bottom of the dilution tank, and a rotating tube is installed in the dilution tank through a bearing, and a driving unit for driving the rotating tube to rotate is installed on the top of the dilution tank; and a connecting tube rotatably installed on the top of the rotating tube, the outer end of the connecting tube is connected to a feeding device through a pipeline, and a stirring tube is fixedly connected to the bottom of the rotating tube, a discharge hole is opened on the outer side of the stirring tube, and material is discharged through the discharge hole; and a circulating extraction unit installed on the outer side of the rotating tube. The dilution tank designed by the invention can mix the waste mineral oil with a reaction solution, so that the waste mineral oil can flocculate small particles, and the designed stirring tube can achieve a stirring effect while completing the injection of the reaction solution, so as to achieve better mixing.

Description

Technical Field

[0001] The invention relates to the technical field of waste mineral oil processing, in particular to a high-efficiency separation device for refining waste mineral oil and a process thereof. Background Art

[0002] Waste mineral oil refers to mineral oil that has been mixed with impurities such as moisture, dust, other miscellaneous oils, and metal powders produced by wear of machine parts during use, which causes the oil to gradually deteriorate and generate organic acids, colloids, and asphalt-like substances. The moisture and solid impurities must be removed during the regeneration process, and the existing method of removing impurities is mainly sedimentation separation. In the existing sedimentation separation operation, after the waste mineral oil is allowed to stand in a container for 8 to 12 hours, solid impurities are separated at the bottom of the container, and the waste mineral oil with moisture and solid impurities removed is obtained at the top of the container, thereby realizing the refining of the waste mineral oil. However, the sedimentation separation method takes a long time to separate materials, and the separation effect is poor, and small particles of solid impurities cannot be separated. Summary of the invention

[0003] The purpose of the present invention is to provide a high-efficiency separation device and process for refining waste mineral oil, so as to solve the problem that the static separation of waste mineral oil mentioned in the above background technology takes a long time and has poor separation effect, resulting in poor quality of refined waste mineral oil.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-efficiency separation device for refining waste mineral oil, comprising a dilution tank, wherein a feed port is installed at the top of the dilution tank, a discharge port is installed at the bottom of the dilution tank, and a rotating tube is also included, wherein the rotating tube is rotatably installed in the dilution tank through a bearing, and a driving unit for driving the rotating tube to rotate is installed at the top of the dilution tank; and a connecting tube rotatably installed at the top of the rotating tube, wherein the outer end of the connecting tube is connected to a feeding device through a pipeline, and is fixedly connected to a stirring tube at the bottom of the rotating tube, wherein a discharge hole is opened on the outer side of the stirring tube, and material is discharged through the discharge hole; and a circulating extraction unit installed on the outer side of the rotating tube, through which the material at the bottom of the dilution tank is transferred to the top.

[0005] Preferably, the rotating tube consists of a thin tube and two thick tubes, the two thick tubes are rotatably docked with the top and bottom of the dilution tank respectively, the two ends of the thin tube are fixedly connected with the two thick tubes, the outer side of the thin tube is engraved with a reciprocating thread groove, and the thin tube is docked with the circulating extraction unit.

[0006] Preferably, the circulating pumping unit includes a storage tube, both ends of which are respectively fitted with the outer sides of the two thick tubes, and the top of the storage tube is fixed to the top of the dilution tank through a connecting frame, and multiple groups of circulation units are installed on the bottom of the storage tube, the outer side of the thin tube is threadedly sleeved with a piston plate, and a sliding opening is opened on the outer side of the piston plate, and a limiting strip adapted to the sliding opening is fixed to the inner side of the storage tube.

[0007] Preferably, a sealing ring is fixed to the outer side of the thick tube, and fitting rings matching with the sealing ring are fixed to both ends of the receiving tube.

[0008] Preferably, the circulation unit includes a suction pipe and a discharge pipe fixedly connected to the bottom of the storage tube, a suction piece is fixed to the outer end of the suction pipe, and the material at the bottom of the dilution tank is sucked through the suction piece, the discharge pipe is L-shaped, and a discharge piece is fixed to the top of the discharge pipe, and the material is discharged through the discharge piece.

[0009] Preferably, the liquid suction component includes a sealing ball and an outer liquid suction tube fixed to the outer end of the liquid suction tube, the outer end of the outer liquid suction tube is fixed with a sealing ring matched with the sealing ball, and a connecting rod is fixed on the sealing ball, the outer side of the connecting rod is fixed to the inner wall of the outer liquid suction tube through a connecting frame, and the outer side of the connecting rod is sleeved with an extrusion spring for pushing the sealing ball to fit toward the sealing ring.

[0010] Preferably, the drainage component includes a sealing plate and an outer drainage tube fixed to the outer end of the drainage tube, a counter-ring is fixed inside the outer drainage tube, a docking rod is fixed on the sealing plate, the outer side of the docking rod is fixed to the inner wall of the outer drainage tube through a connecting frame, and the outer side of the docking rod is sleeved with a tension spring for pulling the sealing plate and the counter-ring to counteract each other.

[0011] Preferably, the driving unit comprises a driving motor fixed on the dilution tank, a driving gear is fixed to the output end of the driving motor, a transmission gear is fixed to the outer side of the thick tube located above, and the driving gear is meshed with the transmission gear.

[0012] Preferably, the vertical end of the discharge pipe is provided with a bent section, the stirring pipe is in an L-shape, and a stirring plate is fixed to the vertical end of the stirring pipe.

[0013] A process for a high-efficiency separation device for refining waste mineral oil comprises the following steps:

[0014] S1. Before the waste mineral oil is extracted, a flocculant is added, and then the waste mineral oil in the upper layer is extracted, which can achieve preliminary separation and rough processing;

[0015] S2, pump the liquid into the dilution tank, then pump the extracted liquid into the rotating tube through the pump, and discharge it through the stirring tube;

[0016] S3, the driving unit drives the stirring tube to rotate and discharge liquid, so that the extracted liquid is mixed with the waste mineral oil;

[0017] S4. The mixed liquid is pumped into a centrifugal extractor through a pump, and a refined liquid is obtained by centrifugal extraction.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The dilution tank designed in the present invention can mix the waste mineral oil with the reaction solution, so that the waste mineral oil can flocculate small particles. The designed stirring tube can achieve a stirring effect while completing the injection of the reaction solution, thereby achieving better mixing and facilitating the preparation of the subsequent refined liquid.

[0020] 2. The circulating pumping unit in the present invention uses the rotation of the capillary to generate power, so that the piston plate moves up and down reciprocatingly, driving the circulating unit to absorb liquid from the bottom of the dilution tank and discharge it from a high place, thereby realizing low-liquid high-discharge operation and achieving more efficient mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a partial cross-sectional schematic diagram of the internal structure of the dilution tank of the present invention;

[0023] Figure 3 It is a partial cutaway rear side view of the dilution tank of the present invention;

[0024] Figure 4 This is a schematic diagram of the connection between the circulating pumping unit and the rotating tube of the present invention;

[0025] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0026] Figure 6 It is a partial cross-sectional rear side view of the storage tube of the present invention;

[0027] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0028] Figure 8 for Figure 6 Enlarged view of point C in the middle.

[0029] In the figure: 1. dilution tank; 2. rotating tube; 3. driving unit; 4. connecting tube; 5. stirring tube; 6. discharge hole; 7. circulating extraction unit; 8. thin tube; 9. thick tube; 10. storage tube; 11. circulating unit; 12. piston plate; 13. sliding mouth; 14. limiting strip; 15. sealing ring; 16. fitting ring; 17. suction tube; 18. discharge tube; 19. suction part; 20. discharge part; 21. sealing ball; 22. suction outer tube; 23. sealing ring; 24. connecting rod; 25. extrusion spring; 26. sealing plate; 27. discharge outer tube; 28. counteracting ring; 29. ​​docking rod; 30. tension spring; 31. driving motor; 32. driving gear; 33. transmission gear; 34. stirring plate. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figure 1 - Figure 4 , a high-efficiency separation device for refining waste mineral oil shown in the figure comprises a dilution tank 1, a feed port is installed on the top of the dilution tank 1, a discharge port is installed on the bottom, and a rotating tube 2 is also included, the rotating tube 2 is rotatably installed in the dilution tank 1 through a bearing, and a driving unit 3 for driving the rotating tube 2 to rotate is installed on the top of the dilution tank 1; and a connecting tube 4 rotatably installed on the top of the rotating tube 2, the outer end of the connecting tube 4 is connected to the feeding device through a pipeline, and is fixedly connected to a stirring tube 5 at the bottom of the rotating tube 2, and a discharge hole 6 is opened on the outer side of the stirring tube 5, and the material is discharged through the discharge hole 6; and a circulating extraction unit 7 installed on the outer side of the rotating tube 2, through which the material at the bottom of the dilution tank 1 is transferred to the top;

[0032] In this solution, personnel pour waste mineral oil from the feed port, and then introduce the reaction solution through the connecting pipe 4, cooperate with the driving unit 3 to drive the rotation of the rotating tube 2, so that the stirring tube 5 can rotate while discharging liquid, thereby improving the mixing effect between the reaction solution and the waste mineral oil. At the same time, the designed circulating pumping unit 7 is used to pump the mixed material at the bottom of the dilution tank 1 to a high place to achieve more efficient mixing.

[0033] It should also be mentioned that the reaction solution may contain sodium hydroxide solution to achieve a demulsification effect in the waste mineral oil, and may also contain a coagulant to polymerize the chlorides in the waste mineral oil so that particularly fine impurities undergo a coagulation reaction, thereby facilitating subsequent centrifugal extraction in a centrifugal extractor to obtain a refined liquid of better quality.

[0034] For further information, see Figure 4 and Figure 6 The rotating tube 2 is composed of a thin tube 8 and two thick tubes 9. The two thick tubes 9 are rotatably connected to the top and bottom of the dilution tank 1 respectively. The two ends of the thin tube 8 are fixedly connected to the two thick tubes 9. The outer side of the thin tube 8 is engraved with a reciprocating thread groove, and the thin tube 8 is connected to the circulating pumping unit 7.

[0035] The design of the capillary tube 8 in the rotating tube 2 can drive the circulating pumping unit 7 while meeting the needs of normal infusion.

[0036] For further information, see Figure 2-Figure 6 The circulating pumping unit 7 includes a receiving tube 10, the two ends of which are respectively fitted with the outer sides of the two thick tubes 9, and the top of the receiving tube 10 is fixed to the top of the dilution tank 1 through a connecting frame, and multiple groups of circulating units 11 are installed at the bottom of the receiving tube 10, the outer side of the thin tube 8 is threadedly sleeved with a piston plate 12, and a sliding opening 13 is opened on the outer side of the piston plate 12, and a limiting strip 14 adapted to the sliding opening 13 is fixed on the inner side of the receiving tube 10;

[0037] Among them, the circulation unit 11 includes a suction pipe 17 and a discharge pipe 18 fixedly connected to the bottom of the storage tube 10, a suction piece 19 is fixed to the outer end of the suction pipe 17, and the material at the bottom of the dilution tank 1 is sucked through the suction piece 19, the discharge pipe 18 is L-shaped, and a discharge piece 20 is fixed to the top of the discharge pipe 18, and the material is discharged through the discharge piece 20.

[0038] The principle of circulating material extraction by the circulating extraction unit 7 is as follows: first, the capillary 8 is driven to rotate continuously through the driving unit 3, and then the piston plate 12 is driven to move up and down reciprocatingly. The initial position of the piston plate 12 is at the bottom. The piston plate 12 moves upward to make the receiving tube 10 negative pressure, thereby cooperating with the liquid suction tube 17 and the liquid suction part 19 to suck the raw materials at the bottom of the dilution tank 1 into the receiving tube 10, and then the piston plate 12 moves downward to squeeze the raw materials in the receiving tube 10 outward, and the discharge pipe 18 and the discharge part 20 cooperate with each other to discharge the raw materials in the receiving tube 10 toward the top of the dilution tank 1, and the piston plate 12 moves up and down through the circulation, so as to realize low liquid and high discharge operation, thereby achieving more efficient mixing.

[0039] For further information, see Figure 7 and Figure 8 The liquid suction member 19 includes a sealing ball 21 and a liquid suction outer tube 22 fixed to the outer end of the liquid suction tube 17, a sealing ring 23 matched with the sealing ball 21 is fixed to the outer end of the liquid suction outer tube 22, and a connecting rod 24 is fixed to the sealing ball 21, the outer side of the connecting rod 24 is fixed to the inner wall of the liquid suction outer tube 22 through a connecting frame, and the outer side of the connecting rod 24 is sleeved with an extrusion spring 25 for pushing the sealing ball 21 to fit the sealing ring 23;

[0040] At the same time, the discharge component 20 includes a sealing plate 26 and a discharge outer tube 27 fixed to the outer end of the discharge tube 18, a counter-ring 28 is fixed inside the discharge outer tube 27, a docking rod 29 is fixed on the sealing plate 26, the outer side of the docking rod 29 is fixed to the inner wall of the discharge outer tube 27 through a connecting frame, and the outer side of the docking rod 29 is sleeved with a tension spring 30 for pulling the sealing plate 26 to counteract the counter-ring 28.

[0041] It should be noted that: when the piston plate 12 moves up to absorb liquid, the tension spring 30 in the liquid discharge member 20 drives the sealing plate 26 to abut against the abutting ring 28, so that the liquid discharge member 20 is sealed and no liquid can enter. Then the negative pressure of the storage tube 10 sucks the sealing ball 21, so that the sealing ball 21 and the sealing ring 23 fall off, so that the liquid at the bottom of the dilution tank 1 enters the storage tube 10, and then moves down through the piston plate 12. At this time, under the action of the squeezing spring 25, the sealing ball 21 and the sealing ring 23 are fitted together, so that the liquid absorption member 19 is sealed. After that, the sealing plate 26 is squeezed outwardly away from the abutting ring 28 through the storage tube 10, and the liquid discharge operation begins. The design of the liquid absorption member 19 and the liquid discharge member 20 allows only one of the liquid absorption tube 17 and the liquid discharge tube 18 to absorb and discharge liquid when liquid is circulated, and liquid circulation cannot be carried out at the same time.

[0042] Further, referring to the figure, the driving unit 3 includes a driving motor 31 fixed on the dilution tank 1, a driving gear 32 is fixed to the output end of the driving motor 31, a transmission gear 33 is fixed to the outer side of the thick tube 9 located above, and the driving gear 32 is meshed with the transmission gear 33;

[0043] The driving motor 31 rotates, driving the driving gear 32 to rotate, so that the transmission gear 33 meshing therewith rotates along with it, thereby driving the rotating tube 2 to rotate.

[0044] In this scheme, the principle of efficient mixing is as follows: first, the rotating tube 2 is driven to rotate by the driving motor 31, and the stirring tube 5 is driven to rotate, so as to realize the discharge and rotation at the same time, so that the reaction solution and the waste mineral oil can be evenly mixed and stirred at the same time. Then, when the capillary 8 in the rotating tube 2 rotates, the piston plate 12 will move up and down, and cooperate with the suction tube 17 and the discharge tube 18 to suck the mixed liquid at the bottom of the dilution tank 1 into the storage tube 10, and squeeze and discharge it to the upper layer of the dilution tank 1, so as to realize the low liquid and high discharge operation. In addition to the rotation and stirring, it can also be transposed up and down, so as to facilitate the mixing effect between the low solution and the high solution, realize efficient mixing, and make the particularly fine impurities have a coagulation reaction, so as to facilitate the subsequent centrifugal extraction by the centrifugal extractor to obtain a refined liquid with better quality.

[0045] In this scheme, a process for a high-efficiency separation device for refining waste mineral oil comprises the following steps:

[0046] S1. Before the waste mineral oil is extracted, a flocculant is added, and then the waste mineral oil in the upper layer is extracted, which can achieve preliminary separation and rough processing;

[0047] S2, pumping the liquid into the dilution tank 1, and then pumping the extracted liquid into the rotating tube 2 through the pump, and discharging it through the stirring tube 5;

[0048] S3, the driving unit 3 drives the stirring tube 5 to rotate and discharge liquid, so that the extracted liquid is mixed with the waste mineral oil;

[0049] S4. The mixed liquid is pumped into a centrifugal extractor through a pump, and a refined liquid is obtained by centrifugal extraction.

[0050] In this scheme, the waste mineral oil is firstly roughened, and the larger solid impurities inside it are separated and removed, and then it is pumped into the dilution tank 1, and sodium hydroxide solution and coagulant are added to break the emulsion and polymerize the chloride in the waste mineral oil, so that the particularly fine impurities have a coagulation reaction, which is convenient for subsequent centrifugal extraction by a centrifugal extractor to obtain a refined liquid with better quality.

[0051] Example 2: Please refer to Figure 6 This embodiment further explains the first embodiment, and the difference lies in that the structure of the storage tube 10 is optimized, so that the sealing effect is better when the storage tube 10 is connected to the thick tube 9.

[0052] Specifically, a sealing ring 15 is fixed to the outer side of the thick tube 9 , and fitting rings 16 matching with the sealing ring 15 are fixed to both ends of the storage tube 10 .

[0053] In this solution, the designed sealing ring 15 and the fitting ring 16 enable the storage tube 10 to dock with the two thick tubes 9 without affecting the normal rotation of the rotating tube 2. At the same time, it can also achieve a better sealing effect.

[0054] Example 3: Please refer to Figure 3 and Figure 6 This embodiment further explains other embodiments, and the difference lies in the optimization of the structure of the discharge pipe 18 and the stirring pipe 5.

[0055] Specifically, the vertical end of the discharge pipe 18 is provided with a bent section, the shape of the stirring tube 5 is L-shaped, and a stirring plate 34 is fixed to the vertical end of the stirring tube 5. By optimizing the shape of the discharge pipe 18, in addition to meeting the normal high-altitude discharge, the stirring plate 34 can also rotate and pass through. Through multiple stirring plates 34, the mixing effect is improved.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency separation device for refining waste mineral oil, comprising: A dilution tank (1), wherein the top of the dilution tank (1) is provided with a feed inlet, and the bottom of the dilution tank (1) is provided with a discharge outlet; It is characterized by further comprising: A rotating tube (2), the rotating tube (2) being rotatably mounted in the dilution tank (1) via a bearing, and a driving unit (3) for driving the rotating tube (2) to rotate is mounted on the top of the dilution tank (1); and, A connecting pipe (4) is rotatably mounted on the top of the rotating tube (2), the outer end of the connecting pipe (4) is connected to the feeding device through a pipeline, and is fixedly connected to the stirring pipe (5) at the bottom of the rotating tube (2), and a discharge hole (6) is opened on the outer side of the stirring pipe (5), and the material is discharged through the discharge hole (6); and, A circulating pumping unit (7) installed outside the rotating tube (2), through which the material at the bottom of the dilution tank (1) is transferred to the top; The rotating tube (2) is composed of a thin tube (8) and two thick tubes (9), the two thick tubes (9) are rotatably connected to the top and bottom of the dilution tank (1) respectively, the two ends of the thin tube (8) are fixedly connected to the two thick tubes (9), the outer side of the thin tube (8) is engraved with a reciprocating thread groove, and the thin tube (8) is connected to the circulating pumping unit (7); The circulating pumping unit (7) comprises a receiving tube (10), the two ends of which are respectively fitted with the outsides of the two thick tubes (9), and the top of the receiving tube (10) is fixed to the top of the dilution tank (1) via a connecting frame, and a plurality of circulating units (11) are installed at the bottom of the receiving tube (10), the outer side of the thin tube (8) is threadedly sleeved with a piston plate (12), and the outer side of the piston plate (12) is provided with a sliding opening (13), and the inner side of the receiving tube (10) is fixed with a piston plate (12) which is in contact with the thin tube (8). The circulation unit (11) comprises a liquid suction pipe (17) and a liquid discharge pipe (18) which are fixedly connected to the bottom of the storage pipe (10); a liquid suction piece (19) is fixed to the outer end of the liquid suction pipe (17), and the material at the bottom of the dilution tank (1) is sucked in through the liquid suction piece (19); the shape of the liquid discharge pipe (18) is L-shaped, and a liquid discharge piece (20) is fixed to the top of the liquid discharge pipe (18), and the material is discharged through the liquid discharge piece (20).

2. The high-efficiency separation device for refining waste mineral oil according to claim 1, characterized in that: A sealing ring (15) is fixed on the outside of the thick tube (9), and fitting rings (16) matching the sealing ring (15) are fixed on both ends of the storage tube (10).

3. The high-efficiency separation device for refining waste mineral oil according to claim 1, characterized in that: The liquid suction component (19) comprises a sealing ball (21) and a liquid suction outer tube (22) fixed to the outer end of the liquid suction tube (17); a sealing ring (23) matched with the sealing ball (21) is fixed to the outer end of the liquid suction outer tube (22); a connecting rod (24) is fixed to the sealing ball (21); the outer side of the connecting rod (24) is fixed to the inner wall of the liquid suction outer tube (22) via a connecting frame; the outer side of the connecting rod (24) is sleeved with an extrusion spring (25) for pushing the sealing ball (21) toward the sealing ring (23) to fit.

4. The high-efficiency separation device for refining waste mineral oil according to claim 1, characterized in that: The liquid discharge member (20) comprises a sealing plate (26) and a liquid discharge outer tube (27) fixed to the outer end of the liquid discharge tube (18); a counter-ring (28) is fixed inside the liquid discharge outer tube (27); a docking rod (29) is fixed on the sealing plate (26); the outer side of the docking rod (29) is fixed to the inner wall of the liquid discharge outer tube (27) via a connecting frame; and a tension spring (30) is sleeved on the outer side of the docking rod (29) for pulling the sealing plate (26) and the counter-ring (28) to counteract each other.

5. The high-efficiency separation device for refining waste mineral oil according to claim 1, characterized in that: The driving unit (3) comprises a driving motor (31) fixed on the dilution tank (1), a driving gear (32) being fixed to the output end of the driving motor (31), a transmission gear (33) being fixed to the outside of the thick tube (9) located above, and the driving gear (32) being meshed with the transmission gear (33).

6. The high-efficiency separation device for refining waste mineral oil according to claim 1, characterized in that: The vertical end of the liquid discharge pipe (18) is provided with a bent section, the stirring pipe (5) is in an L-shape, and a stirring plate (34) is fixed to the vertical end of the stirring pipe (5).

7. A process for a high-efficiency separation device for refining waste mineral oil according to claims 1-6, characterized in that: The following steps are involved: S1. Before the waste mineral oil is extracted, a flocculant is added, and then the waste mineral oil in the upper layer is extracted, which can achieve rough separation and rough processing; S2, pumping the liquid into the dilution tank (1), then pumping the extracted liquid into the rotating tube (2) through the pump, and discharging the liquid through the stirring tube (5); S3, the driving unit (3) drives the stirring tube (5) to rotate and discharge liquid, so that the extracted liquid is mixed with the waste mineral oil. At the same time, the driving unit (3) drives the capillary tube (8) to rotate continuously, and then drives the piston plate (12) to move up and down reciprocatingly. The piston plate (12) moves upward, so that the receiving tube (10) is negatively pressurized, thereby cooperating with the liquid suction tube (17) and the liquid suction member (19) to suck the raw materials at the bottom of the dilution tank (1) into the receiving tube (10), and then the piston plate (12) moves downward to squeeze the raw materials in the receiving tube (10) outward, and the liquid discharge tube (18) and the liquid discharge member (20) cooperate with each other to discharge the raw materials in the receiving tube (10) toward the top of the dilution tank (1). The piston plate (12) moves up and down in a cycle, thereby realizing a low liquid and high discharge operation; S4. The mixed liquid is pumped into a centrifugal extractor through a pump, and a refined liquid is obtained by centrifugal extraction.

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