Filtering filter core for extracting lithium from salt lake

Abstract

This utility model relates to the field of lithium extraction technology from salt lakes, specifically a filter element for lithium extraction from salt lakes. It includes a base plate and a corresponding top plate. From the outside to the inside, a first protective frame, a second protective frame, and a third protective frame are sequentially arranged on the upper surface of the mounting groove. The inner wall of the first protective frame is provided with first filter cotton, the inner wall of the second protective frame is provided with second filter cotton, and the inner wall of the third protective frame is provided with a filter screen. Several positioning posts are located at the center of the upper surface of the base plate. This filter element for lithium extraction from salt lakes features a top plate and a bottom plate with a positioning point that interlocks. The first protective frame and the bottom plate have a circular groove that interlocks. Fastening bolts are threaded into the screw holes at the top of the positioning posts to fix the top plate to the positioning posts. The first, second, and third protective frames work together to support three internal chambers. Furthermore, with the cooperation of the first filter cotton, the second filter cotton, and the filter screen, the filter material passes sequentially from the internal filter screen to the second filter cotton and then to the first filter cotton, achieving multi-layer filtration.

Description

Technical Field

[0001] This utility model relates to the field of lithium extraction technology from salt lakes, specifically a filter element for lithium extraction from salt lakes. Background Technology

[0002] Lithium extraction from salt lakes is a technology that extracts lithium resources from salt lake brine. It is mainly used to produce lithium salt products such as lithium carbonate to meet the needs of the new energy industry, such as lithium batteries. Its core principle is to use chemical and physical methods to separate lithium ions from other impurity ions, so as to achieve efficient enrichment and purification of lithium elements. The extracted raw brine must first be filtered through corresponding filter cartridges to intercept large suspended solids, sand, and other impurities, preventing clogging of the subsequent adsorption / membrane system. A high-precision pleated filter cartridge is installed at the rear end of the adsorption tower to intercept broken adsorbent resin particles, avoiding pipe blockage and equipment wear. A precision filter cartridge is installed before the first-stage nanofiltration membrane to further remove colloids and fine particles, preventing membrane fouling. However, this requires multiple filter cartridges to filter at different locations. It cannot be done before extracting the initial brine, making centralized filtration in one location inconvenient. Segmented filtration also makes centralized cleaning of the filter cartridges difficult, and filter cartridge replacement is not convenient. Utility Model Content

[0003] The purpose of this invention is to provide a filter element for lithium extraction from salt lakes, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A filter element for lithium extraction from salt lakes includes a base plate and a corresponding top plate. The upper surface of the base plate has a mounting groove, and from the outside to the inside, a first retaining ring, a second retaining ring, and a third retaining ring are sequentially arranged in the mounting groove. From the outside to the inside, the upper surface of the mounting groove has a first protective frame, a second protective frame, and a third protective frame sequentially arranged. The inner wall of the first protective frame is provided with first filter cotton, the inner wall of the second protective frame is provided with second filter cotton, and the inner wall of the third protective frame is provided with a filter screen. Several positioning posts are located at the center of the upper surface of the base plate, and screw holes are formed at the top of each positioning post. A water inlet is provided at the center of the upper surface of the top plate, a circular groove is provided on the lower surface of the top plate, and a through hole is provided on the upper surface of the top plate corresponding to the positioning post, and a fastening bolt is provided in each of the through holes.

[0005] Furthermore, several columns are provided on the lower surface of the base plate near the edge, and a first slag discharge pipe, a second slag discharge pipe and a third slag discharge pipe are provided on the lower surface of the base plate from the outside to the inside, and each end is provided with a sealing bolt.

[0006] In this invention, with the cooperation of the first slag discharge pipe, the second slag discharge pipe, and the third slag discharge pipe, removing the sealing bolts helps to discharge the residue filtered in the corresponding filter layer. The sealing bolts are threaded onto the corresponding first slag discharge pipe, the second slag discharge pipe, and the third slag discharge pipe to achieve the corresponding sealing.

[0007] Specifically, the outer walls of the first, second, and third protective frames are provided with several through slots, which are distributed at equal intervals. The bottoms of the first, second, and third protective frames are welded and fixed to the top of the base plate.

[0008] In this utility model, the first protective frame, the second protective frame, and the third protective frame with through grooves work together to increase the stability of the installation of the first filter cotton, the second filter cotton, and the filter screen, and the top plate is supported by the cooperation of the first protective frame, the second protective frame, and the third protective frame.

[0009] It should be noted that the width of the outer wall of the first filter cotton is adapted to the width of the inner wall of the first retaining ring, the width of the outer wall of the second filter cotton is adapted to the width of the inner wall of the second retaining ring, and the width of the outer wall of the filter screen is adapted to the width of the inner wall of the third retaining ring.

[0010] In this invention, the first filter cotton is inserted into the first retaining ring, the second filter cotton is inserted into the second retaining ring, and the filter screen is inserted into the third retaining ring, which increases the stability of the corresponding installation. The mesh size of the filter screen is 1-3mm, the filter pore size of the second filter cotton is 5-10μm, and the filter pore size of the first filter cotton is 1-4μm.

[0011] Furthermore, the positioning posts are distributed in a ring with equal spacing, and the positioning posts are located in the inner circle of the filter screen. The bottom of the positioning posts is welded and fixed to the base plate. The outer diameter of the positioning posts is adapted to the inner diameter of the perforation. The fastening bolts are threadedly connected to the screw holes.

[0012] In this utility model, the positioning post is inserted into the through hole on the top plate, and the lower surface of the knob at the top of the fastening bolt is in close contact with the upper surface of the top plate. Under the action of friction, the position of the top plate and the positioning post is fixed, so that the top plate is inserted and fixed on the top of the first protective frame.

[0013] It is worth adding that the inner diameter of the circular groove is adapted to the outer diameter of the first protective frame, the water inlet and the top plate are integrally formed, and the space inside the water inlet is interconnected with the space in the middle of the inner ring of the filter screen.

[0014] In this invention, the circular groove facilitates the insertion and connection between the bottom of the top plate and the first protective frame, increasing the stability of the installation. The inlet also helps to add the extracted brine to the center of the filter screen for filtration.

[0015] Furthermore, the internal space of the first slag discharge pipe is interconnected with the space between the first filter cotton and the second protective frame, the internal space of the second slag discharge pipe is interconnected with the space between the second filter cotton and the third protective frame, and the internal space of the third slag discharge pipe is interconnected with the space in the middle of the inner ring of the filter screen.

[0016] In this invention, with the cooperation of the first slag discharge pipe and the corresponding sealing bolts open, it is convenient to discharge and clean the filter residue between the first filter cotton and the second protective frame. With the cooperation of the second slag discharge pipe and the corresponding sealing bolts open, it is convenient to discharge and clean the filter residue between the second filter cotton and the third protective frame. With the cooperation of the third slag discharge pipe and the corresponding sealing bolts open, it is convenient to discharge and clean the large particles and silt intercepted in the middle of the filter screen, which helps to continuously perform long-term filtration and reduce the impact of clogging.

[0017] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model achieves the fixation of the top plate and the positioning column by setting the positioning points on the top plate and the bottom plate for insertion and matching, the first protective frame for insertion and matching the circular groove at the bottom of the top plate, and the fastening bolts for threaded connection with the screw holes at the top of the positioning column. With the cooperation of the first protective frame, the second protective frame and the third protective frame, the internal three-layer chamber is supported. With the cooperation of the first filter cotton, the second filter cotton and the filter screen, the extracted brine is added from the water inlet on the top plate and passes through the internal filter screen to the second filter cotton and the first filter cotton in sequence, achieving multi-layer filtration.

[0018] 2. This utility model uses multiple columns to support the base plate, which helps the whole unit to be installed in the position where filtration is required. The first, second, and third slag discharge pipes are fitted with sealing bolts. The removal of the sealing bolts helps to discharge and clean the filter residue inside the corresponding connected chamber, reducing blockage and affecting filtration. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the top plate and bottom plate separation structure of this utility model; Figure 3 This is a schematic diagram of the top plate structure of this utility model; Figure 4 This is a schematic diagram of the combined structure of the base plate, the first protective frame, the second protective frame, and the third protective frame of this utility model. Figure 5 This is a schematic diagram of the base plate structure of this utility model; Figure 6 This is a schematic diagram of the overall cross-sectional structure of this utility model.

[0020] The meanings of the labels in the diagram are as follows: 1. Base plate; 10. Positioning post; 100. Screw hole; 11. Mounting groove; 110. First retaining ring; 111. Second retaining ring; 112. Third retaining ring; 12. First slag discharge pipe; 13. Second slag discharge pipe; 14. Third slag discharge pipe; 15. Column.

[0021] 2. Top plate; 20. Inlet; 21. Perforation; 210. Fastening bolt; 22. Circular groove; 3. First protective frame; 30. First filter cotton; 4. Second protective frame; 40. Second filter cotton; 5. Third protective frame; 50. Filter screen. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-6 This embodiment provides a technical solution: A filter element for lithium extraction from salt lakes includes a base plate 1 and a top plate 2 corresponding to the base plate 1. Several columns 15 are provided on the lower surface of the base plate 1 near the edge. A first slag discharge pipe 12, a second slag discharge pipe 13 and a third slag discharge pipe 14 are provided on the lower surface of the base plate 1 from the outside to the inside, and each end is provided with a sealing bolt.

[0024] In this utility model, with the cooperation of the first slag discharge pipe 12, the second slag discharge pipe 13 and the third slag discharge pipe 14, the removal of the sealing bolt helps to discharge the residue filtered in the corresponding filter layer. The sealing bolt is threadedly connected to the corresponding first slag discharge pipe 12, the second slag discharge pipe 13 and the third slag discharge pipe 14 to achieve the corresponding sealing.

[0025] Furthermore, an installation groove 11 is provided on the upper surface of the base plate 1. A first retaining ring 110, a second retaining ring 111, and a third retaining ring 112 are provided on the installation groove 11 from the outside to the inside. A first protective frame 3, a second protective frame 4, and a third protective frame 5 are provided on the upper surface of the installation groove 11 from the outside to the inside. Several columns 15 are provided on the lower surface of the base plate 1 near the edge. A first slag discharge pipe 12, a second slag discharge pipe 13, and a third slag discharge pipe 14 are provided on the lower surface of the base plate 1 from the outside to the inside, and sealing bolts are provided at the ends of all of them.

[0026] In this utility model, with the cooperation of the first slag discharge pipe 12, the second slag discharge pipe 13 and the third slag discharge pipe 14, the removal of the sealing bolt helps to discharge the residue filtered in the corresponding filter layer. The sealing bolt is threadedly connected to the corresponding first slag discharge pipe 12, the second slag discharge pipe 13 and the third slag discharge pipe 14 to achieve the corresponding sealing.

[0027] Specifically, the inner wall of the first protective frame 3 is provided with a first filter cotton 30, the inner wall of the second protective frame 4 is provided with a second filter cotton 40, and the inner wall of the third protective frame 5 is provided with a filter screen 50. The width of the outer wall of the first filter cotton 30 is adapted to the width of the inner wall of the first retaining ring 110, the width of the outer wall of the second filter cotton 40 is adapted to the width of the inner wall of the second retaining ring 111, and the width of the outer wall of the filter screen 50 is adapted to the width of the inner wall of the third retaining ring 112.

[0028] In this utility model, the first filter cotton 30 is inserted into the first retaining ring 110, the second filter cotton 40 is inserted into the second retaining ring 111, and the filter screen 50 is inserted into the third retaining ring 112, which increases the stability of the corresponding installation. The mesh size of the filter screen 50 is 1-3mm, the filter pore size of the second filter cotton 40 is 5-10μm, and the filter pore size of the first filter cotton 30 is 1-4μm.

[0029] Secondly, a number of positioning posts 10 are provided at the center of the upper surface of the base plate 1, and screw holes 100 are provided at the top of the positioning posts 10; It should be noted that a water inlet 20 is provided at the center of the upper surface of the top plate 2, a circular groove 22 is provided on the lower surface of the top plate 2, and a through hole 21 is provided on the upper surface of the top plate 2 corresponding to the positioning post 10. Each through hole 21 is provided with a fastening bolt 210.

[0030] Furthermore, the positioning posts 10 are distributed in a ring at equal intervals, and the positioning posts 10 are located in the inner ring of the filter screen 50. The bottom of the positioning posts 10 is welded and fixed to the base plate 1. The outer diameter of the positioning posts 10 is adapted to the inner diameter of the through hole 21. The fastening bolt 210 is threadedly connected to the screw hole 100.

[0031] In this utility model, the positioning post 10 is inserted into the through hole 21 on the top plate 2, and the lower surface of the knob at the top of the fastening bolt 210 is tightly attached to the upper surface of the top plate 2. Under the action of friction, the position of the top plate 2 and the positioning post 10 is fixed, so that the top plate 2 is inserted and fixed on the top of the first protective frame 3.

[0032] Specifically, the inner diameter of the circular groove 22 is adapted to the outer diameter of the first protective frame 3, the water inlet 20 and the top plate 2 are integrally formed, and the space inside the water inlet 20 is connected to the space between the inner ring of the filter screen 50.

[0033] In this utility model, the circular groove 22 facilitates the corresponding insertion and engagement of the bottom of the top plate 2 with the first protective frame 3, increasing the stability of the installation. With the help of the water inlet 20, it helps to add the extracted brine to the center of the filter screen 50 for filtration.

[0034] It is worth noting that the internal space of the first slag discharge pipe 12 is connected to the space between the first filter cotton 30 and the second protective frame 4, the internal space of the second slag discharge pipe 13 is connected to the space between the second filter cotton 40 and the third protective frame 5, and the internal space of the third slag discharge pipe 14 is connected to the space in the middle of the inner ring of the filter screen 50.

[0035] In this invention, with the cooperation of the first slag discharge pipe 12 and the corresponding sealing bolt open, it is convenient to discharge and clean the filter residue between the first filter cotton 30 and the second protective frame 4. With the cooperation of the second slag discharge pipe 13 and the corresponding sealing bolt open, it is convenient to discharge and clean the filter residue between the second filter cotton 40 and the third protective frame 5. With the cooperation of the third slag discharge pipe 14 and the corresponding sealing bolt open, it is convenient to discharge and clean the large particles and silt intercepted and filtered in the middle of the filter screen 50, which helps to continuously perform long-term filtration and reduce the impact of clogging.

[0036] In this embodiment, when using the filter element for lithium extraction from salt lakes, the first protective frame 3, the second protective frame 4, and the third protective frame 5 are firstly combined and fixed to the upper surface of the corresponding base plate 1. The first filter cotton 30 is inserted and engaged with the first retaining ring 110, the second filter cotton 40 is inserted and engaged with the second retaining ring 111, the filter screen 50 is inserted and engaged with the third retaining ring 112, and the positioning post 10 with the screw hole 100 is combined and fixed to the base plate 1. Then, the top plate 2 with the water inlet 20 is inserted and engaged with the top of the first protective frame 3. The fastening bolt 210 passes through the through hole 21 and is threadedly connected to the screw hole 100 to fix the position of the base plate 1 and the positioning post 10. The first slag discharge pipe 12, the second slag discharge pipe 13, and the third slag discharge pipe 14 with the sealing bolt are combined and connected to the base plate 1. When brine filtration is required, the brine is guided from the inlet 20 into the center of the filter screen 50. After initial interception and filtration by the filter screen 50, large particles and silt are filtered out. Then, it enters the second filter cotton 40 for secondary filtration, filtering out fine particles. After a third filtration by the first filter cotton 30, the filtration process is reduced, which reduces the impact of clogging of the nanofiltration membrane on continuous filtration and lithium extraction. After long-term use, the sealing bolts on the first slag discharge pipe 12, the second slag discharge pipe 13, and the third slag discharge pipe 14 are opened in sequence to discharge and clean the filter residue. At the same time, the fastening bolts 210 are removed and the top plate 2 is opened, which facilitates the removal, replacement, or cleaning of the first filter cotton 30, the second filter cotton 40, and the filter screen 50, making it convenient for cleaning and long-term multi-layer filtration.

Claims

1. A filter element for lithium extraction from salt lakes, comprising a bottom plate (1) and a corresponding top plate (2) above the bottom plate (1), characterized in that: The upper surface of the base plate (1) is provided with an installation groove (11). The installation groove (11) is provided with a first retaining ring (110), a second retaining ring (111), and a third retaining ring (112) from the outside to the inside. The upper surface of the installation groove (11) is provided with a first protective frame (3), a second protective frame (4), and a third protective frame (5) from the outside to the inside. The inner wall of the first protective frame (3) is provided with a first filter cotton (30), the inner wall of the second protective frame (4) is provided with a second filter cotton (40), and the inner wall of the third protective frame (5) is provided with a filter screen (50). Several positioning posts (10) are provided at the center of the upper surface of the base plate (1). The top of the positioning posts (10) is provided with screw holes (100). A water inlet (20) is provided at the center of the upper surface of the top plate (2), a circular groove (22) is provided on the lower surface of the top plate (2), and a through hole (21) is provided on the upper surface of the top plate (2) corresponding to the positioning post (10), and a fastening bolt (210) is provided in each of the through holes (21).

2. The filter element for lithium extraction from salt lakes according to claim 1, characterized in that: Several columns (15) are provided on the lower surface of the base plate (1) near the edge. The lower surface of the base plate (1) is provided with a first slag discharge pipe (12), a second slag discharge pipe (13) and a third slag discharge pipe (14) from the outside to the inside, and each end is provided with a sealing bolt.

3. The filter element for lithium extraction from salt lakes according to claim 1, characterized in that: The outer walls of the first protective frame (3), the second protective frame (4) and the third protective frame (5) are provided with several through slots, which are distributed at equal intervals. The bottom of the first protective frame (3), the second protective frame (4) and the third protective frame (5) are welded and fixed to the top of the base plate (1).

4. The filter element for lithium extraction from salt lakes according to claim 1, characterized in that: The width of the outer wall of the first filter cotton (30) is adapted to the width of the inner wall of the first retaining ring (110), the width of the outer wall of the second filter cotton (40) is adapted to the width of the inner wall of the second retaining ring (111), and the width of the outer wall of the filter screen (50) is adapted to the width of the inner wall of the third retaining ring (112).

5. The filter element for lithium extraction from salt lakes according to claim 1, characterized in that: The positioning posts (10) are distributed in a ring with equal spacing, and the positioning posts (10) are located in the inner ring of the filter screen (50). The bottom of the positioning posts (10) is welded and fixed to the base plate (1). The outer diameter of the positioning posts (10) is adapted to the inner diameter of the through hole (21). The fastening bolt (210) is threadedly connected to the screw hole (100).

6. The filter element for lithium extraction from salt lakes according to claim 1, characterized in that: The inner diameter of the circular groove (22) is adapted to the outer diameter of the first protective frame (3). The water inlet (20) and the top plate (2) are integrally formed. The space inside the water inlet (20) is connected to the space in the middle of the inner ring of the filter screen (50).

7. The filter element for lithium extraction from salt lakes according to claim 2, characterized in that: The internal space of the first slag discharge pipe (12) is connected to the space between the first filter cotton (30) and the second protective frame (4), the internal space of the second slag discharge pipe (13) is connected to the space between the second filter cotton (40) and the third protective frame (5), and the internal space of the third slag discharge pipe (14) is connected to the space in the middle of the inner ring of the filter screen (50).

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