Filtering and washing device special for lithium extraction by desodium halogen adsorption

Abstract

This invention discloses a dedicated filtration and washing device for sodium halogen adsorption-to-lithium extraction, comprising a main body, a filtration assembly, a washing assembly, a stirring assembly, and a discharge assembly. The main body contains, from top to bottom, a feeding chamber, a filtration chamber, and a collection chamber. The feeding chamber and the filtration chamber are separated by a guide plate, and the filtration chamber and the collection chamber are separated by a filter plate assembly. The filtration assembly includes a corrosion-resistant filter frame, a reinforcing filter cloth, and clamping components. The corrosion-resistant filter frame is detachably installed within the filtration chamber, the reinforcing filter cloth is fixed within the corrosion-resistant filter frame, and the clamping components are symmetrically arranged on both sides of the corrosion-resistant filter frame. This invention, by using a dedicated corrosion-resistant filter frame and reinforcing filter cloth—the corrosion-resistant filter frame being made of polytetrafluoroethylene (PTFE) and the reinforcing filter cloth being made of glass fiber reinforced polyvinylidene fluoride composite filter cloth with a nano-anti-stick coating—effectively improves the device's corrosion resistance and anti-clogging ability, adapting to the operating conditions of sodium halogen adsorption-to-lithium extraction and extending the service life of the filter media.

Description

Technical Field

[0001] This invention relates to the field of lithium extraction technology from salt lakes, specifically a dedicated filtration and washing device for lithium extraction through sodium desulfurization and adsorption. Background Technology

[0002] In the lithium extraction process from salt lakes, adsorption for lithium extraction after sodium removal from the brine is a crucial step. This step requires first adsorbing lithium ions from the desodium-containing brine using an adsorbent, followed by filtration, separation, and washing of the adsorbent to enrich and purify the lithium ions. Existing filtration and washing devices used in this process are mostly general-purpose equipment, which presents the following problems: First, the desodium-containing brine is corrosive and contains fine impurities, easily corroding or clogging the filter media of general-purpose filtration devices, leading to decreased filtration efficiency and shortened service life. Second, the adsorbent tends to accumulate into a cake during filtration, and the washing structure of general-purpose devices cannot achieve uniform spraying of the filter cake, resulting in insufficient washing and some adsorbed lithium ions not being effectively washed away, reducing the lithium recovery rate. Third, the filtration and washing processes are often carried out in steps, requiring manual material transfer, which not only increases labor intensity but also easily leads to material loss and secondary pollution, affecting production continuity.

[0003] To address the aforementioned issues, there is an urgent need to design a filtration and washing device specifically adapted to the sodium halogen adsorption lithium extraction process, in order to overcome the shortcomings of poor compatibility of general-purpose equipment, low lithium recovery rate, and low production efficiency. Summary of the Invention

[0004] To address the problems in related technologies, this invention proposes a dedicated filtration and washing device for sodium halogen adsorption and lithium extraction, which overcomes the issues of easy corrosion and clogging of filter media, uneven washing, and low production efficiency in existing related technologies.

[0005] The aforementioned technical issues.

[0006] Therefore, the specific technical solution adopted by the present invention is as follows: A dedicated filtration and washing device for sodium halogen adsorption and lithium extraction includes a main body, a filtration assembly, a washing assembly, a stirring assembly, and a discharge assembly. The main body contains, from top to bottom, a feeding chamber, a filtration chamber, and a collection chamber. The feeding chamber and the filtration chamber are separated by a guide plate, and the filtration chamber and the collection chamber are separated by a filter plate assembly. The filtration assembly includes a corrosion-resistant filter frame, a reinforcing filter cloth, and clamping components. The corrosion-resistant filter frame is detachably installed inside the filtration chamber, the reinforcing filter cloth is fixed inside the corrosion-resistant filter frame, and the clamping components are symmetrically arranged on both sides of the corrosion-resistant filter frame and slidably connected to the inner wall of the main body. The washing assembly includes an annular spray pipe, branch spray heads, and a liquid inlet pipe. The annular spray pipe is fixed at the top of the filtration chamber, below the guide plate, and the branch spray heads are uniformly sprayed... Distributed inside the annular spray pipe and facing the anti-corrosion filter frame, the liquid inlet pipe has one end penetrating the main body of the device and communicating with the annular spray pipe, and the other end connected to an external washing liquid supply device; the stirring assembly includes a drive motor, a stirring shaft, and a stirring paddle. The drive motor is fixed at the top center of the main body of the device. One end of the stirring shaft is connected to the output end of the drive motor, and the other end extends through the guide plate into the filter chamber. The stirring paddle is fixed at the end of the stirring shaft and is in contact with the surface of the reinforcing filter cloth; the discharge assembly includes a filter residue discharge pipe and a mother liquor discharge pipe. The filter residue discharge pipe is located on one side of the main body of the device and communicates with the bottom of the filter chamber. The mother liquor discharge pipe is located on the other side of the main body of the device and communicates with the bottom of the collection chamber. Both the filter residue discharge pipe and the mother liquor discharge pipe are equipped with control valves.

[0007] Preferably, the anti-corrosion filter frame is made of polytetrafluoroethylene and has several reinforcing ribs inside. The reinforcing ribs are distributed in a mesh pattern and are integrally formed with the anti-corrosion filter frame.

[0008] Preferably, the reinforcing filter cloth is a glass fiber reinforced polyvinylidene fluoride composite filter cloth with a nano anti-stick coating on its surface.

[0009] Preferably, the guide plate has an inverted conical structure with a guide hole at its center, and a one-way valve is provided inside the guide hole.

[0010] Preferably, the clamping component includes a sliding block, a clamping plate, and an adjusting screw. The sliding block is slidably connected to a groove on the inner wall of the device body. The clamping plate is fixedly connected to the sliding block and fits against the side of the anti-corrosion filter frame. One end of the adjusting screw is threadedly connected to the sliding block, and the other end extends through the device body to the outside. An adjusting handle is provided at the end of the adjusting screw.

[0011] Preferably, the stirring paddle is made of elastic rubber material, and its surface is provided with several protrusions.

[0012] Preferably, the liquid collection chamber is equipped with an inclined plate settler, which is inclinedly positioned at the inlet of the mother liquor discharge pipe.

[0013] Preferably, the outer side of the main body of the device is provided with an observation window and a level gauge, the observation window is provided corresponding to the filter chamber, and the level gauge is provided corresponding to the liquid collection chamber.

[0014] The beneficial effects of this invention are as follows: 1. This invention improves the corrosion resistance and anti-clogging ability of the device by setting up a special anti-corrosion filter frame and a reinforced filter cloth. The anti-corrosion filter frame is made of polytetrafluoroethylene, and the reinforced filter cloth is made of glass fiber reinforced polyvinylidene fluoride composite filter cloth with a nano anti-stick coating. This makes it suitable for the working conditions of sodium halogen adsorption and lithium extraction, and extends the service life of the filter material.

[0015] 2. The washing assembly uses a ring-shaped spray pipe with branch spray heads to achieve uniform ring-shaped spraying of the filter cake. At the same time, the elastic stirring paddle of the stirring assembly can gently agitate the filter cake, breaking its dense structure and allowing the washing liquid to fully contact the adsorbent. This solves the problem of uneven washing in traditional devices and significantly improves the lithium recovery rate.

[0016] 3. The device integrates feeding, filtering, washing, slag discharge and liquid collection functions, eliminating the need for manual material transfer, reducing labor intensity, avoiding material loss and secondary pollution. At the same time, the inverted conical structure of the guide plate and the one-way valve design ensure the stability of material flow and improve production continuity and efficiency.

[0017] 4. The inclined plate settler in the collection chamber can perform secondary sedimentation of the mother liquor to further remove impurities and improve the quality of the mother liquor. The observation window and level gauge on the outside of the device facilitate real-time monitoring of the operating conditions by the operator, improving the ease of operation and reliability of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a cross-sectional view of the front of the present invention.

[0020] Figure 3 This is a schematic diagram of the internal partial structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the filter window structure of the present invention.

[0022] Figure 5 This is a schematic diagram of a partial cleaning structure of the present invention.

[0023] In the picture: 1-Main body of the device, 2-Feeding chamber, 3-Filtering chamber, 4-Collection chamber, 5-Guide plate, 6-Anti-corrosion filter frame, 7-Reinforced filter cloth, 8-Clamping component, 9-Annular spray pipe, 10-Branch spray head, 11-Liquid inlet pipe, 12-Drive motor, 13-Agitator shaft, 14-Agitator paddle, 15-Filter residue discharge pipe, 16-Mother liquor discharge pipe, 17-Control valve, 18-Reinforcing rib, 19-Guide hole, 20-One-way valve, 21-Sliding block, 22-Clamping plate, 23-Adjusting screw, 24-Adjusting handle, 25-Protrusion, 26-Inclined plate settler, 27-Observation window, 28-Level gauge, 29-Crater. Detailed Implementation

[0024] See Figures 1 to 5 This invention provides a dedicated filtration and washing device for sodium halogen adsorption and lithium extraction, comprising a main body 1, a filtration assembly, a washing assembly, a stirring assembly, and a discharge assembly. The main body 1 contains, from top to bottom, a feeding chamber 2, a filtration chamber 3, and a collection chamber 4. The feeding chamber 2 and the filtration chamber 3 are separated by a guide plate 5, and the filtration chamber 3 and the collection chamber 4 are separated by a filter plate assembly. The filtration assembly includes a corrosion-resistant filter frame 6, a reinforcing filter cloth 7, and a clamping component 8. The corrosion-resistant filter frame 6 is detachably installed within the filtration chamber 3, the reinforcing filter cloth 7 is fixed within the corrosion-resistant filter frame 6, and the clamping component 8 is symmetrically arranged on both sides of the corrosion-resistant filter frame 6 and slidably connected to the inner wall of the main body 1. The washing assembly includes an annular spray pipe 9, branch spray heads 10, and a liquid inlet pipe 11. The annular spray pipe 9 is fixed at the top of the filtration chamber 3, located below the guide plate 5, and the branch spray heads 10 are evenly distributed within the annular spray pipe 9. The spray pipe 9 is located inside the device body 1 and faces the anti-corrosion filter frame 6. One end of the liquid inlet pipe 11 passes through the main body 1 and is connected to the annular spray pipe 9, while the other end is connected to an external washing liquid supply device. The stirring assembly includes a drive motor 12, a stirring shaft 13, and a stirring paddle 14. The drive motor 12 is fixed at the top center of the main body 1. One end of the stirring shaft 13 is connected to the output end of the drive motor 12, and the other end extends through the guide plate 5 into the filter chamber 3. The stirring paddle 14 is fixed at the end of the stirring shaft 13 and is in contact with the surface of the reinforcing filter cloth 7. The discharge assembly includes a filter residue discharge pipe 15 and a mother liquor discharge pipe 16. The filter residue discharge pipe 15 is located on one side of the main body 1 and is connected to the bottom of the filter chamber 3. The mother liquor discharge pipe 16 is located on the other side of the main body 1 and is connected to the bottom of the collection chamber 4. Both the filter residue discharge pipe 15 and the mother liquor discharge pipe 16 are equipped with control valves 17.

[0025] The corrosion-resistant filter frame 6 is made of polytetrafluoroethylene (PTFE) and has several reinforcing ribs 18 arranged in a mesh pattern, integrally formed with the corrosion-resistant filter frame 6. The reinforcing filter cloth 7 is made of glass fiber reinforced polyvinylidene fluoride composite filter cloth with a nano anti-stick coating on its surface. The guide plate 5 has an inverted conical structure with a guide hole 19 in the center, and a one-way valve 20 is installed inside the guide hole 19. The clamping component 8 includes a sliding block 21, a clamping plate 22, and an adjusting screw 23. The sliding block 21 is slidably connected to the sliding groove 29 on the inner wall of the device body 1. The clamping plate 22 is fixedly connected to the sliding block 21 and fits against the side of the corrosion-resistant filter frame 6. One end of the adjusting screw 23 is threaded to the sliding block 21, and the other end extends through the device body 1 to the outside. An adjusting handle 24 is provided at the end of the adjusting screw 23. The stirring paddle 14 is made of elastic rubber and has several protrusions 25 on its surface. The liquid collection chamber 4 is equipped with an inclined plate settler 26, which is inclinedly positioned at the inlet of the mother liquor discharge pipe 16. The main body 1 of the device is equipped with an observation window 27 and a level gauge 28. The observation window 27 is positioned in relation to the filter chamber 3, and the level gauge 28 is positioned in relation to the liquid collection chamber 4.

[0026] The working process of this embodiment is as follows: First, the mixture of desodium brine and adsorbent after adsorption of lithium ions is injected from the top of the feed chamber 2. The material is guided by the inverted conical guide plate 5 and flows evenly into the filter chamber 3 through the one-way valve 20 in the guide hole 19. Rotating the adjustment handle 24 drives the sliding block 21 to move the pressing plate 22 through the adjustment screw 23, pressing and fixing the anti-corrosion filter frame 6 to ensure that the reinforcing filter cloth 7 is tightly attached to the filter frame. Under the action of gravity, the mother liquor enters the collection chamber 4 after being filtered through the reinforcing filter cloth 7. The inclined plate settler 26 in the collection chamber 4 performs secondary sedimentation on the mother liquor to remove residual fine adsorbent particles. The clarified mother liquor is discharged through the mother liquor discharge pipe 16.

[0027] Once a filter cake of a certain thickness has formed in the filtration chamber 3, the control valve 17 of the mother liquor discharge pipe 16 is closed, and the washing liquid is introduced into the annular spray pipe 9 through the liquid inlet pipe 11. The washing liquid is evenly sprayed onto the surface of the filter cake through the branch spray head 10. At the same time, the drive motor 12 is started, which drives the stirring shaft 13 and the stirring paddle 14 to rotate. The elastic rubber stirring paddle 14, in conjunction with the protrusions 25 on its surface, gently agitates the filter cake, breaking its dense structure and allowing the washing liquid to fully contact the adsorbent, thus washing away the adsorbed lithium ions. The washed filtrate enters the collection chamber 4. After washing is completed, the control valve 17 of the filter residue discharge pipe 15 is opened to discharge the desorbed adsorbent filter residue, completing one filtration and washing cycle.

[0028] Operators can observe the formation and washing of filter cake in the filtration chamber 3 in real time through the observation window 27, and monitor the liquid level of mother liquor in the collection chamber 4 through the liquid level gauge 28, so as to control the timing of discharge in a timely manner and ensure the stable operation of the device.

Claims

1. A dedicated filtration and washing device for sodium halogen adsorption and lithium extraction, characterized in that, The device includes a main body (1), a filter assembly, a washing assembly, a stirring assembly, and a discharge assembly. The main body (1) has a feeding chamber (2), a filter chamber (3), and a liquid collection chamber (4) arranged sequentially from top to bottom. The feeding chamber (2) and the filter chamber (3) are separated by a guide plate (5), and the filter chamber (3) and the liquid collection chamber (4) are separated by a filter plate assembly. The filter assembly includes a corrosion-resistant filter frame (6), a reinforcing filter cloth (7), and a clamping component (8). The corrosion-resistant filter frame (6) is detachable. Installed inside the filter chamber (3), the reinforcing filter cloth (7) is fixed inside the anti-corrosion filter frame (6), and the clamping parts (8) are symmetrically arranged on both sides of the anti-corrosion filter frame (6) and are slidably connected to the inner wall of the main body (1) of the device; the washing assembly includes an annular spray pipe (9), branch spray heads (10) and an inlet pipe (11). The annular spray pipe (9) is fixed at the top of the filter chamber (3) and located below the guide plate (5). The branch spray heads (10) are evenly distributed inside the annular spray pipe (9) and face towards the filter. A corrosion-resistant filter frame (6) is provided with an inlet pipe (11) that passes through the main body (1) of the device and connects to the annular spray pipe (9) at one end, and connects to an external washing liquid supply device at the other end. The stirring assembly includes a drive motor (12), a stirring shaft (13), and a stirring paddle (14). The drive motor (12) is fixed at the top center of the main body (1). One end of the stirring shaft (13) is connected to the output end of the drive motor (12), and the other end extends through the guide plate (5) into the filter chamber (3). The paddle (14) is fixed to the end of the stirring shaft (13) and is in contact with the surface of the reinforcing filter cloth (7); the discharge assembly includes a filter residue discharge pipe (15) and a mother liquor discharge pipe (16). The filter residue discharge pipe (15) is located on one side of the main body of the device (1) and is connected to the bottom of the filter chamber (3). The mother liquor discharge pipe (16) is located on the other side of the main body of the device (1) and is connected to the bottom of the collection chamber (4). Both the filter residue discharge pipe (15) and the mother liquor discharge pipe (16) are equipped with control valves (17).

2. The dedicated filtration and washing device for sodium desulfurization and lithium extraction according to claim 1, characterized in that, The anti-corrosion filter frame (6) is made of polytetrafluoroethylene and has several reinforcing ribs (18) inside. The reinforcing ribs (18) are distributed in a mesh pattern and are integrally formed with the anti-corrosion filter frame (6).

3. The dedicated filtration and washing device for sodium desulfurization and lithium extraction according to claim 1, characterized in that, The reinforced filter cloth (7) is made of glass fiber reinforced polyvinylidene fluoride composite filter cloth, and its surface is provided with a nano anti-stick coating.

4. The dedicated filtration and washing device for sodium desulfurization and lithium extraction according to claim 1, characterized in that, The guide plate (5) has an inverted cone shape and a guide hole (19) in the center. A one-way valve (20) is provided in the guide hole (19).

5. The dedicated filtration and washing device for sodium desulfurization and lithium extraction according to claim 1, characterized in that, The clamping component (8) includes a sliding block (21), a clamping plate (22), and an adjusting screw (23). The sliding block (21) is slidably connected to the sliding groove (29) on the inner wall of the device body (1). The clamping plate (22) is fixedly connected to the sliding block (21) and fits against the side of the anti-corrosion filter frame (6). One end of the adjusting screw (23) is threadedly connected to the sliding block (21), and the other end extends through the device body (1) to the outside. An adjusting handle (24) is provided at the end of the adjusting screw (23).

6. The dedicated filtration and washing device for sodium desulfurization and lithium extraction according to claim 1, characterized in that, The stirring paddle (14) is made of elastic rubber and has several protrusions (25) on its surface.

7. The dedicated filtration and washing device for sodium desulfurization and lithium extraction according to claim 1, characterized in that, The liquid collection chamber (4) is equipped with an inclined plate sedimentation device (26), which is inclinedly set at the inlet of the mother liquor discharge pipe (16).

8. The dedicated filtration and washing device for sodium desulfurization and lithium extraction according to claim 1, characterized in that, The main body (1) of the device is provided with an observation window (27) and a level gauge (28) on the outside. The observation window (27) is set in the filter chamber (3), and the level gauge (28) is set in the liquid collection chamber (4).

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