Brine refining equipment and method for extracting lithium from salt lake

Abstract

The invention discloses brine refining equipment and a brine refining method for extracting lithium from a salt lake, and belongs to the field of brine refining and lithium extraction. A brine refining device for salt lake lithium extraction comprises a precipitation cylinder and further comprises a mounting frame fixedly connected to the precipitation cylinder, a rotating shaft is rotationally connected between the mounting frame and the precipitation cylinder, and a brine refining unit is arranged on the rotating shaft and used for concentrating lithium ions in brine; the feeding unit is arranged on the side, close to the brine refining unit, of the mounting frame, a monitoring and stirring unit is arranged in the precipitation barrel, the feeding unit is located above the brine refining unit, and the monitoring and stirring unit is located below the brine refining unit; the linkage assembly is arranged between the brine refining unit and the monitoring and stirring unit, and the monitoring and stirring unit can drive the brine refining unit to rotate along a set track through the linkage assembly; the method can overcome the defects that the membrane method salt lake lithium extraction efficiency is low, and the equipment operation continuity and stability are poor.

Description

Technical Field

[0001] The invention relates to the technical field of brine refining and lithium extraction, and in particular to a brine refining device and method for extracting lithium from a salt lake. Background Art

[0002] China's salt lakes are rich in natural resources, including not only salt deposits and brine resources, but also salt lake biological resources and tourism resources. Among them, salt deposits and brine resources are the main natural resources of salt lakes. There are not only common salts such as rock salt, mirabilite, and natural soda in huge quantities, but also potassium salts, magnesium salts, nitrates, boron salts, lithium salts urgently needed for the development of the national economy, and precious metal resources such as rubidium, cesium, uranium, and thorium that can be comprehensively developed and utilized.

[0003] Among them, lithium is a key raw material in emerging fields such as new energy vehicles and energy storage technology, and its demand continues to grow. The domestic demand can be met through salt lake lithium extraction technology. Salt lake lithium extraction mainly includes crystallization precipitation, ion exchange, calcination leaching, solvent extraction, adsorption and membrane methods. The membrane method is often used as the main process flow for lithium extraction from salt lakes because of its simple process setting, easy operation and no pollution to the environment.

[0004] The current membrane method of lithium extraction from salt lakes requires frequent replacement of the membrane system due to the short service life of the membrane system. If it is not replaced in time, the efficiency of lithium extraction from salt lakes will be low and the continuity and stability of equipment operation will be affected. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of low efficiency of lithium extraction from salt lakes by membrane method in the prior art and poor continuity and stability of equipment operation, and to propose a brine refining equipment and method for lithium extraction from salt lakes.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A brine refining device for extracting lithium from a salt lake comprises a sedimentation cylinder, and also comprises: a mounting frame fixedly connected to the sedimentation cylinder, a rotating shaft being rotatably connected between the mounting frame and the sedimentation cylinder, a brine refining unit being arranged on the rotating shaft for concentrating lithium ions in the brine; a feeding unit arranged on a side of the mounting frame close to the brine refining unit, a monitoring and stirring unit being arranged inside the sedimentation cylinder, the feeding unit being located above the brine refining unit, and the monitoring and stirring unit being located below the brine refining unit; a linkage assembly being arranged between the brine refining unit and the monitoring and stirring unit, the monitoring and stirring unit being able to drive the brine refining unit to rotate along a predetermined trajectory through the linkage assembly, so as to switch the refining position of the brine refining unit.

[0008] In order to facilitate the replacement of the filter membrane elements, preferably, the brine refining unit includes a rotating shaft rotatably connected to the mounting frame, the outer wall of the sedimentation cylinder is fixedly connected to a fixing plate rotatably connected to the rotating shaft, the rotating shaft is fixedly connected to a connecting frame, and a plurality of groups of filter membrane elements are detachably connected to the connecting frame, a temporary storage ring is fixedly connected to one side of the rotating shaft close to the lower part of the filter membrane element, a sealing member is rotatably connected to the bottom of the temporary storage ring, a connecting pipe is connected between the plurality of groups of the filter membrane elements and the temporary storage ring, and a liquid outlet pipe connected to the sealing member is connected to the temporary storage ring.

[0009] In order to facilitate the control of the addition of salt lake brine and ensure the stability of the addition of salt lake brine, the feeding unit further includes a feeding pipe fixedly connected to the mounting frame, the feeding pipe is provided with a pneumatic valve, the inlet end of the filter membrane element is fixedly connected with a feeding hopper, the feeding hopper is located below the feeding pipe, the feeding hopper is arranged in a conical shape, and the size of the feeding hopper is larger than the size of the feeding pipe.

[0010] In order to facilitate the detection of the replacement status of the filter membrane element, it further includes a push plate fixedly connected to the outer wall of the connecting frame, and a compression cylinder is fixedly connected to the side of the mounting frame close to the push plate. The side of the compression cylinder close to the rotation direction of the push plate is inclined, and the outlet end of the compression cylinder is connected to the pneumatic valve.

[0011] In order to improve the utilization rate of the lithium-containing solution, further, the monitoring and stirring unit includes a mounting plate fixedly connected to the sedimentation cylinder, a connecting shaft is arranged on the mounting plate, a water wheel is fixedly connected to the top of the connecting shaft, a monitoring cylinder is fixedly connected to the side of the mounting plate away from the water wheel, a plurality of stirring frames are fixedly connected to the connecting shaft, a connecting pipe is connected between the monitoring cylinder and the pneumatic valve, wherein the water wheel is located below the filter membrane element, and the connecting pipe is located at the lower part of the outer wall of the monitoring cylinder and the end portion is connected to the inlet end of the monitoring cylinder.

[0012] In order to facilitate the detection of the efficiency of lithium extraction from salt lake brine, further, a spring is fixedly connected to the inside of the monitoring tube, and a piston plate is fixedly connected to the side of the connecting shaft close to the monitoring tube. The piston plate fits tightly against the inner wall of the monitoring tube, and the end of the spring is rotatably connected to the piston plate.

[0013] In order to facilitate timely replacement of the filter membrane element according to the usage status, the linkage assembly further includes a horizontal shaft rotatably connected to the sedimentation cylinder, the end of the horizontal shaft close to the connecting shaft is fixedly connected to the first driven bevel gear, the connecting shaft is fixedly connected to the first driving bevel gear meshing with the first driven bevel gear, the end of the horizontal shaft away from the first driven bevel gear extends to the outside of the sedimentation cylinder, and the end is fixedly connected to the second driving bevel gear, and the rotating shaft is fixedly connected to the second driven bevel gear meshing with the second driving bevel gear.

[0014] In order to ensure the stability of the filter membrane element after switching, it further includes a positioning piece fixedly connected to the bottom end of the rotating shaft, the positioning piece is provided with multiple groups of positioning holes, and the positioning piece is symmetrically provided with a guide slope on one side close to the positioning hole, and the sedimentation cylinder is fixedly connected with a fixing seat on one side close to the positioning piece, and a positioning cylinder is fixedly connected to the fixing seat, wherein the positioning cylinder is elastic, the end of the positioning cylinder is circular, and the end of the positioning cylinder matches the positioning hole, the positioning cylinder is connected to the inlet end of the monitoring cylinder by a pipeline, and the positioning cylinder is connected to the compression cylinder by a pipeline.

[0015] In order to facilitate the collection of solid lithium salt, preferably, the bottom of the sedimentation cylinder is conical, and a discharge port is provided at the bottom of the sedimentation cylinder, a valve is provided on the discharge port, and a support is fixedly connected to the outer wall of the sedimentation cylinder.

[0016] A brine refining method for extracting lithium from salt lakes comprises the following steps:

[0017] Step 1: Initially, the raw brine is refined. During the refining process, the working status of the membrane filter system can be monitored and the refined brine can be stirred;

[0018] Step 2: When the refining efficiency of the membrane filter system drops to a threshold, the membrane filter system is switched and the discharge of the raw brine is closed;

[0019] Step 3: During the switching process, the position of the filter membrane system is positioned to ensure stable refining of the brine;

[0020] Step 4: After the membrane filter system is switched, continue to discharge the original brine and fix the position of the membrane filter system;

[0021] Step 5: The refined high-concentration lithium ion brine is precipitated into lithium carbonate by adding soda ash, and finally the lithium carbonate is collected.

[0022] Compared with the prior art, the present invention provides a brine refining device and method for extracting lithium from salt lakes, which has the following beneficial effects:

[0023] 1. The brine refining equipment for extracting lithium from salt lakes can drive the monitoring and stirring unit to rotate through the feeding unit and the brine refining unit, which can not only accelerate the mixing of the lithium-containing solution and soda ash, thereby accelerating the precipitation of lithium carbonate, but also monitor the discharge efficiency of the lithium-containing solution to facilitate switching of the filter membrane element, so as to improve the efficiency of extracting lithium from the salt lake.

[0024] 2. The brine refining equipment used for lithium extraction from salt lakes can monitor the stirring unit and drive the brine refining unit to rotate through the linkage component when the separation efficiency of the filter membrane element is low, and at the same time close the feeding unit to prevent the salt lake brine from being directly discharged into the sedimentation cylinder. While ensuring the quality of lithium extraction by membrane method, there is no need to frequently stop the equipment to replace the filter membrane element, which improves the continuity and stability of the equipment operation.

[0025] 3. The brine refining equipment used for lithium extraction from salt lakes can accurately detect the switching status of the filter membrane element through the push plate and the compression cylinder, and at the same time drive the positioning cylinder and the positioning part to fix the replaced filter membrane element to ensure the stability of the filter membrane element during use.

[0026] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The present invention can overcome the low efficiency of lithium extraction from salt lakes by membrane method and the poor continuity and stability of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of a brine refining device for extracting lithium from salt lakes proposed by the present invention Figure 1 ;

[0028] Figure 2 A schematic diagram of the structure of a brine refining device for extracting lithium from salt lakes proposed by the present invention Figure 2 ;

[0029] Figure 3 This is a partial structural schematic diagram of a brine refining device for extracting lithium from a salt lake proposed by the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of a sedimentation cylinder in a brine refining device for extracting lithium from a salt lake proposed by the present invention;

[0031] Figure 5 This is a schematic diagram of a partial cross-sectional structure of a sedimentation cylinder in a brine refining device for extracting lithium from a salt lake proposed by the present invention;

[0032] Figure 6 This is a schematic diagram of the cross-sectional structure of a monitoring tube in a brine refining device for extracting lithium from a salt lake, as proposed by the present invention;

[0033] Figure 7 A brine refining device for extracting lithium from salt lakes proposed by the present invention Figure 4 Schematic diagram of the structure of part A.

[0034] In the figure: 1. sedimentation cylinder; 2. mounting frame; 3. fixing plate; 4. rotating shaft; 5. connecting frame; 6. filter membrane element; 7. feed hopper; 8. temporary storage ring; 9. sealing member; 10. connecting pipe; 11. liquid outlet pipe; 12. feed pipe; 13. pneumatic valve; 14. push plate; 15. compression cylinder; 16. mounting plate; 17. connecting shaft; 18. water wheel; 19. monitoring cylinder; 20. connecting pipe; 21. spring; 22. piston plate; 23. stirring frame; 24. first driving bevel gear; 25. horizontal axis; 26. first driven bevel gear; 27. second driving bevel gear; 28. second driven bevel gear; 29. ​​positioning member; 30. positioning hole; 31. guide slope; 32. fixing seat; 33. positioning cylinder; 34. support; 35. discharge port. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] Embodiment 1:

[0038] Reference Figure 1-Figure 7 , a brine refining device for extracting lithium from a salt lake, comprising a sedimentation cylinder 1, the specific structure of the sedimentation cylinder 1 can refer to the technical solutions in the prior art, and those skilled in the art can know it, and it will not be described in detail here, and also comprises: a mounting frame 2 fixedly connected to the sedimentation cylinder 1, a rotating shaft 4 is rotatably connected between the mounting frame 2 and the sedimentation cylinder 1, the rotating shaft 4 is located outside the sedimentation cylinder 1, and a brine refining unit is arranged on the rotating shaft 4 for concentrating lithium ions in the brine; a feeding unit is arranged on one side of the mounting frame 2 close to the brine refining unit, and the sedimentation cylinder 1 A monitoring and stirring unit is arranged inside, the feeding unit is located above the brine refining unit, and the monitoring and stirring unit is located below the brine refining unit; a linkage component is arranged between the brine refining unit and the monitoring and stirring unit, and the monitoring and stirring unit can drive the brine refining unit to rotate along a predetermined trajectory through the linkage component, so as to switch the refining position of the brine refining unit. The bottom of the sedimentation cylinder 1 is arranged in a conical shape, and a discharge port 35 is arranged at the bottom of the sedimentation cylinder 1, and a valve is arranged on the discharge port 35, and a support 34 is fixedly connected to the outer wall of the sedimentation cylinder 1.

[0039] In this embodiment, only part of the process flow of lithium extraction from salt lakes is shown. The membrane methods used to extract lithium from salt lake brine include a nanofiltration membrane system and a reverse osmosis membrane system, respectively. The nanofiltration membrane system is located before the reverse osmosis membrane system, that is, the salt lake brine needs to pass through the nanofiltration membrane system before passing through the reverse osmosis membrane system. The nanofiltration membrane system can also be replaced in the manner proposed in this application to further improve the overall continuity and stability of the salt lake lithium extraction equipment. Soda ash needs to be added to the refined lithium-containing solution to precipitate lithium ions in the form of lithium carbonate in the precipitation cylinder 1.

[0040] Reference Figure 1-Figure 3 The brine refining unit includes a rotating shaft 4 rotatably connected to a mounting frame 2, a fixing plate 3 rotatably connected to the rotating shaft 4 is fixedly connected to the outer wall of the sedimentation cylinder 1, a connecting frame 5 is fixedly connected to the rotating shaft 4, and a plurality of groups of filter membrane elements 6 are detachably connected to the connecting frame 5, a temporary storage ring 8 is fixedly connected to one side of the rotating shaft 4 close to the lower part of the filter membrane element 6, a sealing member 9 is rotatably connected to the bottom of the temporary storage ring 8, a connecting pipe 10 is connected between the plurality of groups of filter membrane elements 6 and the temporary storage ring 8, and a liquid outlet pipe 11 connected to the temporary storage ring 8 is connected to the sealing member 9.

[0041] It should be explained that the filter membrane element 6 is a conventional means in the prior art, so it is not described in detail. The filter membrane element 6 usually includes a group of inlet ends and two groups of outlet ends, one group of outlet ends is used to discharge salt lake brine, and the other group of outlet ends is used to discharge lithium-containing solution. No matter which group of filter membrane elements 6 is in working state, it can flow into the temporary storage ring 8 through the connecting pipe 10, and finally be discharged through the liquid outlet pipe 11, so as to recycle the salt lake brine. In addition, the number of filter membrane elements 6 is not limited, and the staff can set it according to the situation. The connecting frame 5 and the filter membrane element 6 can be detachably connected by bolts or the like, so as to disassemble and assemble the replaced filter membrane element 6.

[0042] Reference Figure 1-Figure 2 The feeding unit includes a feeding pipe 12 fixedly connected to the mounting frame 2, and a pneumatic valve 13 is arranged on the feeding pipe 12. The inlet end of the filter membrane element 6 is fixedly connected to a feeding hopper 7, and the feeding hopper 7 is located below the feeding pipe 12. The feeding hopper 7 is arranged in a conical shape, and the size of the feeding hopper 7 is larger than the size of the feeding pipe 12.

[0043] It needs to be explained that the pneumatic valve 13 is a conventional means in the prior art, and initially, the pneumatic valve 13 is in an open state. When the pneumatic valve 13 is inhaled, the pneumatic valve 13 is in a closed state, and the end of the feed pipe 12 is connected to the treated salt lake brine.

[0044] Reference Figure 2, and also includes a push plate 14 fixedly connected to the outer wall of the connecting frame 5, and a compression cylinder 15 is fixedly connected to the side of the mounting frame 2 close to the push plate 14, and the compression cylinder 15 is inclined on the side close to the rotation direction of the push plate 14, and the outlet end of the compression cylinder 15 is connected to the pneumatic valve 13.

[0045] When the push plate 14 passes through the compression cylinder 15, the compression cylinder 15 can be compressed. It should be explained that when the push plate 14 rotates, the pneumatic valve 13 is in a closed state and the interior is in a negative pressure state. At this time, after the gas compressed by the compression cylinder 15 enters the pneumatic valve 13, the pneumatic valve 13 can be in an initial state, that is, the pneumatic valve 13 is in an open state at this time.

[0046] Reference Figure 2 , Figure 4 and Figure 5 The monitoring and stirring unit includes a mounting plate 16 fixedly connected to the sedimentation cylinder 1, a connecting shaft 17 is arranged on the mounting plate 16, a water wheel 18 is fixedly connected to the top of the connecting shaft 17, a monitoring cylinder 19 is fixedly connected to the side of the mounting plate 16 away from the water wheel 18, a plurality of stirring frames 23 are fixedly connected to the connecting shaft 17, a connecting pipe 20 is connected between the monitoring cylinder 19 and the pneumatic valve 13, wherein the water wheel 18 is located below the filter membrane element 6, the connecting pipe 20 is located at the lower part of the outer wall of the monitoring cylinder 19 and the end thereof is connected to the inlet end of the monitoring cylinder 19.

[0047] When liquid passes through the water wheel 18, it can drive the water wheel 18 to rotate, wherein the torque of the water wheel 18 can be adjusted by the height difference between the liquid and the water wheel 18 and the amount of liquid passing through, that is, when the lithium-containing solution is separated normally, the amount of lithium-containing solution and the height difference are sufficient to drive the water wheel 18 to rotate, and when the separation amount of the lithium-containing solution decreases, on the one hand, the rotation speed of the water wheel 18 can be slowed down, and on the other hand, the resistance encountered by the water wheel 18 can be reduced.

[0048] Reference Figure 5-Figure 6 A spring 21 is fixedly connected to the inside of the monitoring tube 19, and a piston plate 22 is fixedly connected to the side of the connecting shaft 17 close to the monitoring tube 19. The piston plate 22 fits tightly against the inner wall of the monitoring tube 19, and the end of the spring 21 is rotatably connected to the piston plate 22.

[0049] When the lithium-containing solution is discharged normally, the water wheel 18 encounters a large resistance, which will drive the piston plate 22 to compress the spring 21. When the discharge amount of the lithium-containing solution decreases (at this time, the filter membrane element 6 is in a state that needs to be replaced), the spring 21 drives the piston plate 22 to move upward, and at the same time, the pneumatic valve 13 is adsorbed through the connecting pipe 20, thereby closing the pneumatic valve 13.

[0050] Reference Figure 4 , Figure 5 and Figure 7The linkage assembly includes a transverse shaft 25 rotatably connected to the sedimentation cylinder 1, and the end of the transverse shaft 25 close to the connecting shaft 17 is fixedly connected to the first driven bevel gear 26, and the connecting shaft 17 is fixedly connected to the first driving bevel gear 24 meshing with the first driven bevel gear 26. The end of the transverse shaft 25 away from the first driven bevel gear 26 extends to the outside of the sedimentation cylinder 1, and the end is fixedly connected to the second driving bevel gear 27, and the rotating shaft 4 is fixedly connected to the second driven bevel gear 28 meshing with the second driving bevel gear 27.

[0051] When the lithium-containing solution is discharged normally, the first driving bevel gear 24 does not mesh with the first driven bevel gear 26. When the discharge amount of the lithium-containing solution decreases, under the action of the spring 21, the first driving bevel gear 24 will mesh with the first driven bevel gear 26, thereby driving the filter element 6 to rotate through the second driving bevel gear 27 and the second driven bevel gear 28, so as to facilitate the replacement of the filter element 6. It should be explained that the resistance encountered by the connecting frame 5 and the rotating shaft 4 during rotation is relatively small (this method is a conventional means in the prior art), that is, when the lithium-containing solution drives the water wheel 18 to rotate, it is sufficient to drive the rotating shaft 4 and the connecting frame 5 to rotate.

[0052] Reference Figure 4 and Figure 7 , and also includes a positioning member 29 fixedly connected to the bottom end of the rotating shaft 4, the positioning member 29 is provided with multiple groups of positioning holes 30, and the positioning member 29 is symmetrically provided with a guide slope 31 on one side close to the positioning hole 30, and a fixing seat 32 is fixedly connected to the side of the sedimentation cylinder 1 close to the positioning member 29, and a positioning cylinder 33 is fixedly connected to the fixing seat 32, wherein the positioning cylinder 33 is elastic, and the end of the positioning cylinder 33 is circularly arranged, and the end of the positioning cylinder 33 matches the positioning hole 30, the positioning cylinder 33 is connected to the inlet end of the monitoring cylinder 19 through a pipeline, and the positioning cylinder 33 is connected to the compression cylinder 15 through a pipeline.

[0053] When the discharge amount of lithium-containing solution is small, the monitoring tube 19 is in an adsorption state, so that the positioning cylinder 33 is in a storage state, that is, the positioning hole 30 of the positioning cylinder 33 is disengaged. When the filter membrane element 6 rotates to a certain angle (the new filter membrane element 6 rotates to the bottom of the feed pipe 12), the compression cylinder 15 is compressed by the push plate 14, and the compressed gas is transported to the positioning cylinder 33, so that the positioning cylinder 33 matches the positioning hole 30, and under the action of the guide slope 31, the filter membrane element 6 is directly below the feed pipe 12 to ensure the stability of the salt lake brine discharge.

[0054] Embodiment 2:

[0055] A brine refining method for extracting lithium from salt lakes comprises the following steps:

[0056] Step 1: Initially, the raw brine is refined. During the refining process, the working status of the membrane filter system can be monitored and the refined brine can be stirred;

[0057] Step 2: When the refining efficiency of the membrane filter system drops to a threshold, the membrane filter system is switched and the discharge of the raw brine is closed;

[0058] Step 3: During the switching process, the position of the filter membrane system is positioned to ensure stable refining of the brine;

[0059] Step 4: After the membrane filter system is switched, continue to discharge the original brine and fix the position of the membrane filter system;

[0060] Step 5: The refined high-concentration lithium ion brine is precipitated into lithium carbonate by adding soda ash, and finally the lithium carbonate is collected.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A brine refining device for extracting lithium from salt lakes, comprising a sedimentation cylinder (1), characterized in that: Also includes: A mounting frame (2) fixedly connected to the sedimentation cylinder (1), a rotating shaft (4) rotatably connected between the mounting frame (2) and the sedimentation cylinder (1), and a brine refining unit is arranged on the rotating shaft (4) for concentrating lithium ions in the brine; A feeding unit is arranged on one side of the mounting frame (2) close to the brine refining unit, a monitoring and stirring unit is arranged inside the settling cylinder (1), the feeding unit is located above the brine refining unit, and the monitoring and stirring unit is located below the brine refining unit; A linkage assembly is arranged between the brine refining unit and the monitoring and stirring unit. The monitoring and stirring unit can drive the brine refining unit to rotate along a predetermined trajectory through the linkage assembly, so as to switch the refining position of the brine refining unit.

2. A brine refining equipment for extracting lithium from salt lakes according to claim 1, characterized in that: The brine refining unit comprises a rotating shaft (4) rotatably connected to a mounting frame (2); the outer wall of the sedimentation cylinder (1) is fixedly connected to a fixing plate (3) rotatably connected to the rotating shaft (4); the rotating shaft (4) is fixedly connected to a connecting frame (5); a plurality of groups of filter membrane elements (6) are detachably connected to the connecting frame (5); a temporary storage ring (8) is fixedly connected to one side of the rotating shaft (4) close to the lower part of the filter membrane element (6); a sealing member (9) is rotatably connected to the bottom of the temporary storage ring (8); a connecting pipe (10) is connected between the plurality of groups of the filter membrane elements (6) and the temporary storage ring (8); and a liquid outlet pipe (11) connected to the sealing member (9) is connected to the temporary storage ring (8).

3. A brine refining equipment for extracting lithium from salt lakes according to claim 2, characterized in that: The feed unit comprises a feed pipe (12) fixedly connected to a mounting frame (2), a pneumatic valve (13) being arranged on the feed pipe (12), a feed hopper (7) being fixedly connected to the inlet end of the filter membrane element (6), the feed hopper (7) being located below the feed pipe (12), the feed hopper (7) being arranged in a conical shape, and the size of the feed hopper 7 being larger than the size of the feed pipe (12).

4. A brine refining equipment for extracting lithium from salt lakes according to claim 3, characterized in that: It also includes a push plate (14) fixedly connected to the outer wall of the connecting frame (5); a compression cylinder (15) is fixedly connected to the side of the mounting frame (2) close to the push plate (14); the compression cylinder (15) is inclined on the side close to the rotation direction of the push plate (14); and the outlet end of the compression cylinder (15) is connected to the pneumatic valve (13).

5. A brine refining equipment for extracting lithium from salt lakes according to claim 4, characterized in that: The monitoring stirring unit comprises a mounting plate (16) fixedly connected to the sedimentation cylinder (1), a connecting shaft (17) being arranged on the mounting plate (16), a water wheel (18) being fixedly connected to the top end of the connecting shaft (17), a monitoring cylinder (19) being fixedly connected to the side of the mounting plate (16) away from the water wheel (18), a plurality of stirring frames (23) being fixedly connected to the connecting shaft (17), a connecting pipe (20) being connected between the monitoring cylinder (19) and the pneumatic valve (13), The water wheel (18) is located below the filter membrane element (6), and the connecting pipe (20) is located at the lower part of the outer wall of the monitoring tube (19) and the end thereof is connected to the inlet end of the monitoring tube (19).

6. The brine refining equipment for extracting lithium from salt lakes according to claim 5, characterized in that: A spring (21) is fixedly connected to the interior of the monitoring tube (19); a piston plate (22) is fixedly connected to the side of the connecting shaft (17) close to the monitoring tube (19); the piston plate (22) is tightly fitted to the inner wall of the monitoring tube (19); and the end of the spring (21) is rotatably connected to the piston plate (22).

7. The brine refining equipment for extracting lithium from salt lakes according to claim 5, characterized in that: The linkage assembly comprises a transverse shaft (25) rotatably connected to the sedimentation cylinder (1); an end of the transverse shaft (25) close to the connecting shaft (17) is fixedly connected to a first driven bevel gear (26); a first driving bevel gear (24) meshing with the first driven bevel gear (26) is fixedly connected to the connecting shaft (17); an end of the transverse shaft (25) away from the first driven bevel gear (26) extends to the outside of the sedimentation cylinder (1) and an end thereof is fixedly connected to a second driving bevel gear (27); and a second driven bevel gear (28) meshing with the second driving bevel gear (27) is fixedly connected to the rotating shaft (4).

8. The brine refining equipment for extracting lithium from salt lakes according to claim 5, characterized in that: The device further comprises a positioning member (29) fixedly connected to the bottom end of the rotating shaft (4), wherein the positioning member (29) is provided with a plurality of positioning holes (30), and a guide slope (31) is symmetrically provided on one side of the positioning member (29) close to the positioning holes (30), and a fixing seat (32) is fixedly connected to one side of the sedimentation cylinder (1) close to the positioning member (29), and a positioning cylinder (33) is fixedly connected to the fixing seat (32). The positioning cylinder (33) is elastic, the end of the positioning cylinder (33) is circular, and the end of the positioning cylinder (33) matches the positioning hole (30), the positioning cylinder (33) is connected to the inlet end of the monitoring tube (19) through a pipeline, and the positioning cylinder (33) is connected to the compression cylinder (15) through a pipeline.

9. The brine refining equipment for extracting lithium from salt lakes according to claim 1, characterized in that: The bottom of the sedimentation cylinder (1) is arranged in a conical shape, and a discharge port (35) is arranged at the bottom of the sedimentation cylinder (1), a valve is arranged on the discharge port (35), and a support (34) is fixedly connected to the outer wall of the sedimentation cylinder (1).

10. A method for refining brine for extracting lithium from a salt lake, using a brine refining device for extracting lithium from a salt lake as claimed in any one of claims 1 to 9, characterized in that: The steps include: Step 1: Initially, the raw brine is refined. During the refining process, the working status of the membrane filter system can be monitored and the refined brine can be stirred; Step 2: When the refining efficiency of the membrane filter system drops to a threshold, the membrane filter system is switched and the discharge of the raw brine is closed; Step 3: During the switching process, the position of the filter membrane system is positioned to ensure stable refining of the brine; Step 4: After the membrane filter system is switched, continue to discharge the original brine and fix the position of the membrane filter system; Step 5: The refined high-concentration lithium ion brine is precipitated into lithium carbonate by adding soda ash, and finally the lithium carbonate is collected.

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