Cellulose filter and salt lake lithium extraction membrane treatment system

Abstract

The utility model relates to the technical field of salt lake lithium extraction, and the utility model provides a cellulose filter and salt lake lithium extraction acid film treatment system, including the jar body with the containing cavity, first pipe spare setting in containing cavity, for the lake water of receiving, first pipe spare has the water outlet part, and the water outlet part has a plurality of even arrangement, and is used for the first water outlet hole of lake water discharge, second pipe spare is set in the outer periphery of water outlet part, and the filter water space is formed between second pipe spare and jar body, and second pipe spare has a plurality of even arrangement's second water outlet hole, sealing ring, slidingly sets up in the outer periphery of first pipe spare, and sealing ring can slide along the axial direction of first pipe spare, and sealing ring can block the lake water in the filtration space and overflow to the upper portion of sealing ring. Through the above technical scheme, the lake water and cellulose are contacted fully and evenly, the large particle suspended matter and colloid in the lake water are effectively removed, the burden of subsequent filtration structure is reduced, and the filtration effect of the whole filtration unit is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of lithium extraction technology from salt lakes, specifically to a cellulose filter and a salt lake lithium extraction acid membrane treatment system. Background Technology

[0002] With the rapid development of the new energy industry, especially electric vehicles and energy storage batteries, the demand for lithium, as the core raw material for lithium-ion batteries, has surged, posing a challenge to the traditional lithium resource supply system. Salt lake lithium extraction refers to the technology of extracting lithium resources from salt lake brine. Globally, approximately 70% of lithium resources are found in salt lake brine, far exceeding the reserves of solid minerals such as spodumene. Compared to solid mineral extraction, salt lake lithium extraction, if the technology matures, can be directly extracted from the brine, eliminating the need for ore mining and transportation, potentially reducing costs by 30%-50%. Since the 21st century, China has developed technologies such as adsorption and membrane separation methods specifically for the characteristics of salt lakes in Qinghai and Tibet, gradually achieving industrialization. In the process of salt lake lithium extraction, the lake water often needs to be filtered first, which involves the use of cellulose filters. Cellulose filters can remove large suspended solids and some colloids from the lake water. The performance of the cellulose filter affects the service life and effectiveness of subsequent filters. However, existing cellulose filters suffer from uneven contact between cellulose and lake water due to issues with the distribution of cellulose packing and the way the lake water enters, affecting the filtration effect. Therefore, there is an urgent need for a device that can effectively solve the above problems, so as to enable the cellulose filler to have more uniform and sufficient contact with lake water. Utility Model Content

[0003] To overcome the above-mentioned defects, this utility model provides a cellulose filter and a lithium acid extraction membrane treatment system for salt lakes, which solves the technical problem of uneven and insufficient contact between the cellulose filler in the cellulose filter and the lake water in related technologies.

[0004] According to one aspect, at least one embodiment of the present invention provides a cellulose filter, comprising:

[0005] The tank body has a receiving cavity;

[0006] The first pipe fitting is disposed in the receiving cavity for receiving lake water. The first pipe fitting coincides with the central axis of the tank body. The first pipe fitting has a water outlet, and the water outlet has a plurality of evenly arranged first water outlet holes for discharging lake water.

[0007] The second pipe fitting is sleeved on the outer periphery of the water outlet. A filtration space is formed between the water outlet and the second pipe fitting. A water filtration space is formed between the second pipe fitting and the tank. The water filtration space is used to contain the filtered lake water. The water filtration space is used to contain the cellulose that filters the lake water. The second pipe fitting has several evenly arranged second water outlet holes.

[0008] A sealing ring is slidably fitted around the outer periphery of the first pipe fitting. The sealing ring can slide along the axial direction of the first pipe fitting. The sealing ring can prevent lake water in the filtration space from overflowing to the upper part of the sealing ring. The bottom of the sealing ring is provided with several hooks for hooking cellulose.

[0009] For example, at least one embodiment of this utility model provides a cellulose filter, wherein the tank has an inlet at the top and an outlet at the bottom, and further includes:

[0010] An installation plate is disposed within the receiving cavity and connected to the inner wall of the receiving cavity. The first pipe and the second pipe are disposed above the installation plate. The installation plate has a plurality of third water outlet holes, which are located outside the second pipe and are used to discharge the filtered lake water in the filtration space.

[0011] For example, at least one embodiment of this utility model provides a cellulose filter in which a water-guiding frustum is provided on the mounting plate. The water-guiding frustum is located inside the first pipe and is coaxially arranged with the first pipe. The water-guiding frustum is used to guide lake water to the lower outer periphery of the first pipe so that the lake water is discharged through the first outlet hole.

[0012] For example, at least one embodiment of the present invention provides a cellulose filter that further includes:

[0013] The telescopic component is provided in a plurality of such components, which are spaced apart around the outer periphery of the first pipe. One end of each telescopic component is connected to the outer wall of the first pipe and the other end is connected to the sealing ring. The telescopic component can drive the sealing ring to move up and down.

[0014] For example, at least one embodiment of the present invention provides a cellulose filter in which a limiting ring is also sleeved on the outer periphery of the first tube, the limiting ring being located below the sealing ring and used to limit the downward movement of the sealing ring.

[0015] For example, at least one embodiment of the present invention provides a cellulose filter that further includes:

[0016] A water inlet pipe is provided, which penetrates the top wall of the tank and is connected to the first pipe fitting. A water inlet valve is provided on the water inlet pipe.

[0017] The outlet pipe is connected to the bottom of the tank and is used to discharge the filtered lake water.

[0018] For example, at least one embodiment of the present invention provides a cellulose filter that further includes:

[0019] A backwash inlet pipe is connected to the inlet pipe and the outlet pipe respectively, and is used to supply backwash water to the outlet pipe. A backwash inlet valve is provided on the backwash inlet pipe.

[0020] The backwash drain pipe is connected to the inlet pipe and the outlet pipe respectively, and is used to discharge the backwash water in the inlet pipe. A backwash outlet valve is provided between the inlet pipe and the backwash drain pipe, and a drain valve is provided between the outlet pipe and the backwash drain pipe.

[0021] According to another aspect, at least one embodiment of the present invention also provides a lithium acid extraction membrane treatment system for salt lakes, comprising:

[0022] The filtration unit is used to filter suspended solids and microorganisms from the lake water;

[0023] An adsorption unit, connected to the filtration unit, is used to receive lake water filtered by the filtration unit. The adsorption unit is used to adsorb lithium ions in the lake water and form a lithium-loaded adsorbent.

[0024] The desorption unit is connected to the adsorption unit and is used to receive the lithium-loaded adsorbent formed by the adsorption unit. The desorption unit can wash the lithium-loaded adsorbent with alkaline lithium salt solution and desorb it with dilute acid to form a qualified desorption solution.

[0025] An acid membrane unit, connected to the desorption unit, is used to receive the qualified desorption solution produced in the desorption unit. The acid membrane unit is used to concentrate and separate the qualified desorption solution to form a lithium-ion-rich concentrate and acid membrane permeate.

[0026] For example, at least one embodiment of this utility model provides a lithium acid extraction membrane treatment system from salt lakes, wherein the filtration unit includes:

[0027] A cellulose filter, wherein the cellulose filter is used to filter large particulate suspended matter and colloids in lake water and form a first filtered lake water;

[0028] A first security filter is connected to the cellulose filter. The first security filter can filter out small particulate suspended matter in the first filtered lake water and form second filtered lake water.

[0029] An ultrafiltration device is connected to the first security filter. The ultrafiltration device can filter microorganisms and macromolecular organic matter in the second filtered lake water and form a third filtered lake water.

[0030] For example, at least one embodiment of the present invention provides a lithium acid extraction membrane treatment system for salt lakes, which further includes:

[0031] A second security filter is disposed between the desorption unit and the acid membrane unit, and is connected to both the desorption unit and the acid membrane unit.

[0032] The beneficial effects of the embodiments of this utility model are as follows:

[0033] The first pipe fitting, aligned with the central axis of the tank, along with the evenly distributed first water outlet, ensures that lake water enters the filtration space uniformly, guaranteeing that cellulose in all areas of the filtration space participates in filtration and improving filtration efficiency. The second pipe fitting, working in conjunction with the first, forms the filtration space and the water filtration space. The filtration space houses the cellulose to filter the lake water, while the water filtration space collects the filtered lake water. The evenly distributed second water outlet ensures that the filtered lake water flows smoothly into the water filtration space. The sliding design of the sealing ring allows the cellulose to expand and contract within the filtration space, adjusting its distribution and preventing localized accumulation or thinning due to long-term use, thus ensuring stable filtration performance. Simultaneously, the sealing ring prevents lake water overflow, avoiding interference with the expansion and contraction components. Through this structural combination, the cellulose filter effectively removes large suspended solids and colloids from the lake water, providing pre-treated lake water for subsequent filtration structures such as the first security filter, reducing the burden on subsequent filtration structures and ensuring the overall filtration effect of the filtration unit. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0035] Figure 1 This is a schematic diagram of a lithium acid extraction membrane treatment system from a salt lake in one embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of a cellulose filter in another embodiment of the present invention;

[0037] Figure 3 This is a top view of a cellulose filter according to the present utility model;

[0038] Figure 4 for Figure 3 A cross-sectional view along the AA direction in the embodiment;

[0039] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0040] Figure 6 for Figure 4 Enlarged diagram of point C in the middle.

[0041] In the diagram: 1. Filtration unit, 2. Adsorption unit, 3. Desorption unit, 4. Acid membrane unit, 5. Cellulose filter, 501. Tank, 502. Receiving cavity, 503. First pipe fitting, 5031. Water outlet, 5032. First water outlet, 5033. Limiting ring, 504. Second pipe fitting, 5041. Second water outlet, 505. Filtration space, 506. Filtering space, 507. Sealing ring, 508. Water inlet. 509. Water outlet; 510. Mounting plate; 5101. Third water outlet hole; 511. Water guide frustum; 512. Telescopic component; 513. Water inlet pipe; 514. Water inlet valve; 515. Water outlet pipe; 516. Backwash water inlet pipe; 517. Backwash water inlet valve; 518. Backwash drain pipe; 519. Backwash water outlet valve; 520. Drain valve; 6. First security filter; 7. Ultrafiltration device; 8. Second security filter. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0043] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0044] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0047] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0048] like Figures 2-6 As shown, a cellulose filter 5 according to an embodiment of the present invention includes a tank 501, a first pipe 503, a second pipe 504, and a sealing ring 507. The tank 501 has an internal cavity 502. The first pipe 503 is disposed within the cavity 502 and coincides with the central axis of the tank 501. The first pipe 503 has a water outlet 5031, on which several evenly arranged first water outlet holes 5032 are formed, allowing lake water to enter the first pipe 503 and exit through the first water outlet holes 5032. The second pipe fitting 504 is sleeved on the outside of the first pipe fitting 503. The water outlet 5031 of the first pipe fitting 503 is located inside the second pipe fitting 504. A filtration space 505 is formed between the water outlet 5031 and the second pipe fitting 504. A water filtration space 506 is formed between the second pipe fitting 504 and the tank 501. The water filtration space 506 is used to contain the filtered lake water. The filtration space 505 contains cellulose used to filter the lake water. Several evenly arranged second water outlet holes 5041 are opened on the second pipe fitting 504.

[0049] A sealing ring 507 is slidably fitted onto the first pipe fitting 503, allowing it to slide up and down along the central axis of the first pipe fitting 503. It also prevents lake water in the filtration space 505 from overflowing to the upper part of the sealing ring 507. The top of the cellulose in the filtration space 505 is connected to the sealing ring 507 via a hook and can move up and down with the sealing ring 507. During operation, external lake water enters the receiving cavity 502 of the tank 501, flows into the first pipe fitting 503, and enters the filtration space 505 through the first outlet hole 5032 of the outlet section 5031. The cellulose in the filtration space 505 filters the incoming lake water, removing large suspended solids and colloids. The filtered lake water enters the water filtration space 506 through the second outlet hole 5041 on the second pipe fitting 504, and then is discharged from the tank 501 to the next stage of the filtration unit 1. During the filtration process, the sealing ring 507 slides up and down along the first pipe 503, causing the cellulose connected to it to expand or contract within the filtration space 505, while preventing lake water overflow and ensuring that the lake water is in full contact with the cellulose within the filtration space 505. A limiting ring 5033 is also fitted around the outer periphery of the first pipe 503. The limiting ring 5033 is located below the sealing ring 507 and is used to limit the downward movement of the sealing ring 507.

[0050] Specifically, the first pipe fitting 503 is aligned with the central axis of the tank 501, and together with the evenly distributed first water outlet holes 5032 on the water outlet section 5031, the lake water can enter the filtration space 505 evenly, ensuring that the cellulose in each area of ​​the filtration space 505 can participate in filtration, thus improving filtration efficiency. The second pipe fitting 504 cooperates with the first pipe fitting 503 to form the filtration space 505 and the filtration water space 506. The filtration space 505 contains the cellulose to filter the lake water, and the filtration water space 506 collects the filtered lake water. The evenly distributed second water outlet holes 5041 ensure that the filtered lake water can smoothly enter the filtration water space 506. The sliding setting of the sealing ring 507 can drive the cellulose to expand and contract within the filtration space 505, adjusting the distribution of the cellulose and preventing local accumulation or thinning of the cellulose due to long-term use, thus ensuring the stability of the filtration effect. At the same time, the sealing ring 507 also prevents lake water from overflowing, preventing lake water from affecting the expansion joint 512. The cellulose filter 5, through the above-mentioned structural combination, effectively removes large particulate matter and colloids from the lake water, providing pretreated lake water for subsequent filtration structures such as the first security filter 6, reducing the burden on subsequent filtration structures, and ensuring the filtration effect of the entire filtration unit 1.

[0051] like Figures 4-6As shown, the cellulose filter 5 has an inlet 508 at the top of its tank 501 and an outlet 509 at the bottom. A mounting plate 510 is disposed within the receiving cavity 502. The first pipe fitting 503 and the second pipe fitting 504 are both mounted on the mounting plate 510. Several third outlet holes 5101 are formed on the mounting plate 510 outside the second pipe fitting 504, allowing filtered lake water to be transported to the outlet 509. A water-guiding frustum 511 is mounted on the mounting plate 510 and located within the first pipe fitting 503, guiding lake water to the outlet section 5031. During operation, external lake water enters the receiving cavity 502 of the tank 501 through the inlet 508, comes into contact with the water guiding frustum 511 located inside the first pipe 503, and flows to the outlet 5031 of the first pipe 503 under the guidance of the water guiding frustum 511. It then enters the filtration space 505 through the first outlet hole 5032. The lake water filtered by cellulose enters the filtration space 506 through the second outlet hole 5041 of the second pipe 504, and then flows into the third outlet hole 5101 on the mounting plate 510. It is then transported through the third outlet hole 5101 to the outlet 509 at the bottom of the tank 501, and then discharged to the next stage of the filtration unit 1.

[0052] Specifically, the third water outlet 5101 on the mounting plate 510 connects the filtration space 506 with the outlet 509, allowing the filtered lake water in the filtration space 506 to flow to the outlet 509 in an orderly and efficient manner, avoiding stagnation in the filtration space 506 and improving the treatment efficiency of the lake water. The water guiding truncated cone 511 is located inside the first pipe 503 and at the bottom of the first pipe 503. It can guide the lake water entering the receiving cavity 502, causing the lake water to flow downwards to the side away from the central axis of 501, and then discharge the lake water through the third water outlet 5101 on the outlet part 5031. This allows the lake water to disperse and flow to the outer periphery of the first pipe 503, ensuring that more lake water enters the filtration space 505 through the first water outlet 5032, thereby improving the contact efficiency between the lake water and cellulose. The flow path of lake water within the cellulose filter 5 has been further optimized, allowing the filtered lake water to be discharged more smoothly. In conjunction with structures such as the sealing ring 507, the filtration effect and operational stability of the entire cellulose filter 5 are improved.

[0053] like Figures 2-4As shown, the cellulose filter 5 also includes an inlet pipe 513, an outlet pipe 515, a backwash inlet pipe 516, and a backwash drain pipe 518. The inlet pipe 513 is connected to the inlet 508 of the tank 501 and is equipped with an inlet valve 514. The outlet pipe 515 is connected to the outlet 509 of the tank 501 and is equipped with an outlet valve. The backwash inlet pipe 516 is connected to both the inlet pipe 513 and the outlet pipe 515 and is equipped with a backwash inlet valve 517. The backwash drain pipe 518 is connected to both the inlet pipe 513 and the outlet pipe 515. A backwash outlet valve 519 is installed between the inlet pipe 513 and the backwash drain pipe 518, and a drain valve 520 is installed between the outlet pipe 515 and the backwash drain pipe 518. During normal filtration, open the inlet valve 514 and the outlet valve, and close the backwash inlet valve 517, the backwash outlet valve 519, and the drain valve 520. Lake water enters the tank 501 through the inlet pipe 513 and the inlet 508, is guided by the water guide cone 511 to the outlet 5031 of the first pipe fitting 503, enters the filtration space 505 through the first outlet hole 5032, passes through the cellulose filter, and enters the water filtration space 506 through the second outlet hole 5041 of the second pipe fitting 504. It is then discharged through the third outlet hole 5101 of the mounting plate 510, the outlet 509, and the outlet pipe 515. When backwashing is required, close the inlet valve 514 and the outlet valve, and open the backwash inlet valve 517, the backwash outlet valve 519, and the drain valve 520. Backwash water enters the inlet pipe 513 and the outlet pipe 515 through the backwash inlet pipe 516. Backwash water entering the outlet pipe 515 flows through outlet 509 and the third outlet 5101 into the filtration space 506, and then through the second outlet 5041 into the filtration space 505 to backwash the cellulose. Backwash water entering the inlet pipe 513 flows through inlet 508 into the tank 501 for auxiliary rinsing. Wastewater generated during rinsing flows through the first outlet 5032 into the first pipe fitting 503, and then through the backwash outlet valve 519 into the backwash drain pipe 518. Simultaneously, wastewater in the filtration space 506 flows through the third outlet 5101, outlet 509, and drain valve 520 into the backwash drain pipe 518, and is finally discharged through the backwash drain pipe 518. By reversing the flow of backwash water, impurities trapped by the cellulose can be removed, restoring the cellulose's filtration performance, extending the cellulose replacement cycle, and reducing maintenance costs. This ensures the continuous and stable operation of the entire brine lake lithium acid extraction membrane treatment system.

[0054] like Figure 1As shown, this invention illustrates a lithium acid extraction membrane treatment system for salt lakes according to one embodiment. The input end of the filtration unit 1 is connected to an external lake water supply source, and its output end is connected to the input end of the adsorption unit 2 via a pipe. The filtration unit 1 is used to intercept suspended solids and microorganisms in the lake water. After being treated by the filtration structure, the lake water enters the adsorption unit 2. The adsorption unit 2 has several adsorption channels inside, which are filled with adsorbent. The filtered lake water flows within the adsorption channels and comes into contact with the adsorbent, which adsorbs lithium ions from the lake water to form a lithium-loaded adsorbent. The bottom of the adsorption unit 2 is connected to the top of the desorption unit 3 via a pipe, and the lithium-loaded adsorbent enters the desorption unit 3 via the pipe. The desorption unit 3 is equipped with a desorption chamber, which is connected to both an alkaline lithium salt solution supply pipe and a dilute acid supply pipe. First, an alkaline lithium salt solution is supplied to the desorption chamber through the alkaline lithium salt solution supply pipe to wash the lithium-loaded adsorbent. Then, dilute acid is supplied to the desorption chamber through the dilute acid supply pipe to desorb the washed lithium-loaded adsorbent, forming a qualified desorption solution, which is then transported to the acid membrane unit 4 via a pipeline. The acid membrane unit 4 is equipped with a membrane module, which includes a concentration side and a permeate side. The qualified desorption solution enters the concentration side of the membrane module. Under the pressure difference across the membrane, water molecules in the qualified desorption solution permeate through the membrane into the permeate side, forming acid membrane permeate. Lithium ions accumulate on the concentration side, forming a lithium-ion-rich concentrate. A concentrate outlet is provided on the concentration side, and an acid membrane permeate outlet is provided on the permeate side.

[0055] Specifically, filtration unit 1 removes suspended solids and microorganisms from the lake water, preventing them from entering adsorption unit 2 and contaminating the adsorbent, thus ensuring the adsorption efficiency of the adsorbent for lithium ions. Adsorption unit 2 achieves selective adsorption of lithium ions by contacting the adsorbent with the lake water through adsorption channels. The resulting lithium-loaded adsorbent enters desorption unit 3 through a discharge port connected to it, ensuring continuous adsorption and desorption processes. Desorption unit 3 removes impurities from the surface of the lithium-loaded adsorbent by rinsing with an alkaline lithium salt solution, followed by dilute acid desorption to obtain a qualified desorbed solution. This qualified desorbed solution directly enters acid membrane unit 4 through a pipeline, eliminating the need for alkali neutralization in existing technologies. The membrane module of acid membrane unit 4 directly processes the qualified desorbed solution, utilizing the selective permeability of the membrane to concentrate lithium ions and separate water. This eliminates the need for a neutralization container, reduces the use of alkaline solutions, lowers system operating costs, and improves the overall efficiency of lithium extraction from salt lakes.

[0056] Main water quality data table of acid membrane unit product liquid

[0057]

[0058] As shown in the table above, after acid membrane concentration and separation, the qualified desorption solution influent flow rate is 10,000 t / d, the acid membrane permeate flow rate is 7,000 t / d, and the acid membrane concentrate flow rate is 3,000 t / d. Most of the ions are concentrated in the concentrate. The data in the table shows that after acid membrane concentration and separation, the desalination rate of the acid membrane is as high as 98%, and the recovery rate can reach 70%. The acid membrane permeate can be recycled, and the acid membrane concentrate volume is less than the qualified desorption solution volume, which reduces the storage tank volume, thereby reducing the floor space required and improving space utilization. At the same time, the smaller volume of treated water also reduces the use of alkaline reagents.

[0059] like Figure 1 As shown, filtration unit 1 includes a cellulose filter 5, a first security filter 6, an ultrafiltration device 7, and a second security filter 8. The input end of the cellulose filter 5 is connected to an external lake water supply source, allowing it to receive external lake water. The cellulose filter 5 is connected to the first security filter 6 via a pipe. The cellulose filter 5 treats the lake water, intercepting large suspended particles and colloids to form first filtered lake water, which is then transported to the first security filter 6. The first security filter 6 is connected to the ultrafiltration device 7 via a pipe. The first filtered lake water enters the first security filter 6, where small suspended particles are intercepted, forming second filtered lake water, which is then transported to the ultrafiltration device 7. The ultrafiltration device 7 is connected to the second security filter 8 via a pipe. After entering the ultrafiltration device 7, microorganisms and large organic molecules are removed, forming third filtered lake water, which is then transported to the adsorption unit 2. The second security filter 8 is connected to both the desorption unit 3 and the acid membrane unit 4, and is used to receive qualified desorption liquid. After treatment by the second security filter 8, the liquid is transported to the acid membrane unit 4.

[0060] Specifically, the cellulose filter 5 first treats the lake water, removing large suspended particles and colloids to prevent these impurities from entering the subsequent first security filter 6, thus preventing rapid clogging of the filter elements and extending its service life. The first security filter 6 receives the first filtered lake water discharged from the cellulose filter 5 and further removes small suspended particles, significantly reducing the particulate impurity content in the second filtered lake water entering the ultrafiltration unit 7. This reduces wear and contamination of the membrane modules in the ultrafiltration unit 7, ensuring its filtration efficiency. The ultrafiltration unit 7 treats the second filtered lake water, removing microorganisms and large organic molecules. The resulting qualified desorption solution enters the second security filter 8, preventing microbial growth in the subsequent acid membrane unit 4 and preventing organic matter from adversely affecting the membrane modules in the acid membrane unit 4. The second security filter 8 performs final treatment on the qualified desorption solution, further reducing the impurity content in the fluid entering the acid membrane unit 4. Adsorption unit 2 receives the fluid treated by the second security filter 8, which reduces the coverage of the adsorbent by impurities, ensures the contact area between the adsorbent and lithium ions, and maintains adsorption efficiency. Acid membrane unit 4 receives the fluid treated by the second security filter 8, which prevents impurities from adhering to the membrane surface, maintains the membrane's separation performance, and reduces the frequency of membrane cleaning. The components of filtration unit 1 are connected sequentially to form a progressively advanced filtration process. Each stage of filtration treats impurities of different types and sizes, gradually improving the purification level of the lake water. This ensures the stable operation of adsorption unit 2 and acid membrane unit 4, thereby enhancing the reliability and continuity of the entire salt lake lithium extraction acid membrane treatment system.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A cellulose filter, characterized in that, include: The tank (501) has a receiving cavity (502); The first pipe fitting (503) is disposed in the receiving cavity (502) for receiving lake water. The first pipe fitting (503) coincides with the central axis of the tank (501). The first pipe fitting (503) has a water outlet (5031). The water outlet (5031) has a plurality of evenly arranged first water outlet holes (5032) for discharging lake water. The second pipe fitting (504) is sleeved on the outer periphery of the water outlet (5031). A filtration space (505) is formed between the water outlet (5031) and the second pipe fitting (504). A water filtration space (506) is formed between the second pipe fitting (504) and the tank (501). The water filtration space (506) is used to contain the filtered lake water. The filtration space (505) is used to contain the cellulose that was used to filter the lake water. The second pipe fitting (504) has a plurality of evenly arranged second water outlet holes (5041). A sealing ring (507) is slidably sleeved on the outer periphery of the first pipe fitting (503). The sealing ring (507) can slide along the axial direction of the first pipe fitting (503). The sealing ring (507) can prevent lake water in the filter space (505) from overflowing to the upper part of the sealing ring (507). The bottom of the sealing ring (507) is provided with several hooks for hooking cellulose.

2. A cellulose filter according to claim 1, characterized in that, The tank (501) has an inlet (508) at the top and an outlet (509) at the bottom, and also includes: An installation plate (510) is disposed inside the receiving cavity (502) and connected to the inner wall of the receiving cavity (502). The first pipe (503) and the second pipe (504) are disposed above the installation plate (510). The installation plate (510) has a plurality of third water outlet holes (5101). The third water outlet holes (5101) are located outside the second pipe (504). The third water outlet holes (5101) are used to discharge the filtered lake water in the filtration space (506).

3. A cellulose filter according to claim 2, characterized in that, The mounting plate (510) is provided with a water guiding frustum (511), which is located inside the first pipe fitting (503) and coaxially arranged with the first pipe fitting (503). The water guiding frustum (511) is used to guide lake water to the lower outer periphery of the first pipe fitting (503) so that the lake water is discharged through the first water outlet (5032).

4. A cellulose filter according to claim 2, characterized in that, Also includes: There are several telescopic components (512), and several telescopic components (512) are arranged at intervals around the outer periphery of the first pipe (503) in the circumferential direction. One end of the telescopic component (512) is connected to the outer wall of the first pipe (503), and the other end is connected to the sealing ring (507). The telescopic component (512) can drive the sealing ring (507) to move up and down.

5. A cellulose filter according to claim 2, characterized in that, The outer periphery of the first pipe fitting (503) is also fitted with a limiting ring (5033), which is located below the sealing ring (507) and is used to limit the downward movement of the sealing ring (507).

6. A cellulose filter according to claim 1, characterized in that, Also includes: A water inlet pipe (513) is provided through the top wall of the tank (501) and is connected to the first pipe fitting (503). A water inlet valve (514) is provided on the water inlet pipe (513). The outlet pipe (515) is connected to the bottom of the tank (501) and is used to discharge filtered lake water.

7. A cellulose filter according to claim 6, characterized in that, Also includes: The backwash inlet pipe (516) is connected to the inlet pipe (513) and the outlet pipe (515) respectively, and is used to supply backwash water to the outlet pipe (515). The backwash inlet pipe (516) is equipped with a backwash inlet valve (517). The backwash drain pipe (518) is connected to the water inlet pipe (513) and the water outlet pipe (515) respectively, and is used to discharge the backwash water in the water inlet pipe (513). A backwash outlet valve (519) is provided between the water inlet pipe (513) and the backwash drain pipe (518), and a drain valve (520) is provided between the water outlet pipe (515) and the backwash drain pipe (518).

8. A lithium acid extraction membrane treatment system from a salt lake, used in a cellulose filter as described in any one of claims 1-7, characterized in that, include: Filter unit (1) is used to filter suspended solids and microorganisms in lake water; The adsorption unit (2) is connected to the filtration unit (1) and is used to receive the lake water filtered by the filtration unit (1). The adsorption unit (2) is used to adsorb lithium ions in the lake water and form a lithium-loaded adsorbent. The desorption unit (3) is connected to the adsorption unit (2) and is used to receive the lithium-loaded adsorbent formed by the adsorption unit (2). The desorption unit (3) can perform alkaline lithium salt solution rinsing and dilute acid desorption on the lithium-loaded adsorbent to form a qualified desorption solution. The acid membrane unit (4) is connected to the desorption unit (3) and is used to receive the qualified desorption liquid generated in the desorption unit (3). The acid membrane unit (4) is used to concentrate and separate the qualified desorption liquid to form a lithium-ion-rich concentrate and acid membrane permeate.

9. The lithium acid extraction membrane treatment system from salt lakes according to claim 8, characterized in that, The filter unit (1) includes: Cellulose filter (5), the cellulose filter (5) is used to filter large particulate suspended matter and colloids in lake water and form the first filtered lake water; The first security filter (6) is connected to the cellulose filter (5). The first security filter (6) can filter small particulate suspended matter in the first filtered lake water and form the second filtered lake water. The ultrafiltration device (7) is connected to the first security filter (6). The ultrafiltration device (7) can filter microorganisms and macromolecular organic matter in the second filtered lake water and form the third filtered lake water.

10. A membrane treatment system for lithium acid extraction from salt lakes according to claim 8, characterized in that, Also includes: The second security filter (8) is disposed between the desorption unit (3) and the acid membrane unit (4), and is connected to the desorption unit (3) and the acid membrane unit (4) respectively.

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