Filtering device in aluminum oxide lithium extraction adsorbent separation section and use method

Abstract

The invention belongs to the technical field of aluminum oxide lithium extraction adsorbent separation, and particularly relates to a filtering device in an aluminum oxide lithium extraction adsorbent separation workshop section and a using method, the device comprises a filtering tank, the top of the filtering tank is provided with a feeding port and an air inlet, the bottom of the filtering tank is provided with a discharging port, and the discharging port is provided with a thick slurry discharging structure; a spraying structure is arranged at the top of the inner side of the filtering tank, a stirring shaft is rotationally connected to the inner side of the filtering tank, stirring blades are arranged on the stirring shaft, the top end of the stirring shaft penetrates out of the filtering tank and is in transmission connection with a driving structure, and the bottom end of the stirring shaft is in transmission connection with a thick slurry discharging structure; and an upper filtering structure is arranged at the upper part of the inner side of the filtering tank, and a lower filtering structure is arranged at the lower part of the inner side of the filtering tank. By utilizing the structure and the method, the invention provides the filtering device and the use method, which can realize the integrated functions of efficient solid-liquid separation, continuous filtering operation, spraying for preventing blockage, stirring for promoting material dispersion, double-layer gradient filtering and linkage discharging in the separation section of the adsorbent for extracting lithium from aluminum oxide.

Description

Technical Field

[0001] This invention belongs to the field of alumina lithium extraction adsorbent separation technology, and particularly relates to a filtration device and its usage method in the alumina lithium extraction adsorbent separation process. Background Technology

[0002] Lithium extraction from alumina represents a significant breakthrough in lithium resource extraction in recent years, primarily recovering lithium from bauxite, alumina production waste, or intermediate products. In the Bayer process, adding a composite lithium adsorbent to the concentrate achieves synergistic effects between lithium and alumina production, significantly improving resource utilization efficiency and economic benefits while maintaining the stability of alumina production. Precise solid-liquid filtration separation plays a crucial role, directly impacting product yield. Traditional processes use leaf filters for separation, but these filters rely on filter cloth, which is prone to tearing and damage during filtration, requiring frequent cloth replacements and consuming significant labor. Therefore, selecting a reliable and stable filtration system is essential.

[0003] The prior art (Chinese Patent CN201310382435.2) discloses an integrated filtration device and method for producing alumina using the Bayer process. Although it reduces equipment such as seed tanks and stirring equipment, as well as corresponding pipes, valves, and fittings, thus reducing the workload of equipment maintenance during device operation, its filtration structure still uses a leaf filter for separation. Moreover, it has poor ability to filter liquids with high concentrations, cannot effectively discharge the filter cake, and cannot remove the filter cake adhering to the leaf filter. Summary of the Invention

[0004] The purpose of this invention is to provide a filtration device and method for use in the separation process of lithium adsorbent in alumina extraction, so as to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention provides the following solution: A filtration device in the separation section of lithium alumina adsorbent separation process includes: a filter tank, the top of which is provided with a feed inlet and an air inlet, the bottom of which is provided with a discharge outlet, and the discharge outlet is provided with a slurry discharge structure; The filter tank is equipped with a spray structure at the top of its inner side. A stirring shaft is rotatably connected to the inner side of the filter tank. The stirring shaft is equipped with stirring blades. The top end of the stirring shaft extends out of the filter tank and is connected to the drive structure. The bottom end of the stirring shaft is connected to the slurry discharge structure. The upper part of the inner side of the filter tank is provided with an upper filter structure, which is connected to the collection pipe on the outside of the filter tank through an upper drain pipe. The lower part of the inner side of the filter tank is provided with a lower filter structure, which is connected to the collection pipe through a lower drain pipe.

[0006] Preferably, the spray structure includes at least two annular spray pipes, which are fixedly connected to the top of the inner side of the filter tank. The bottom surface of the annular spray pipes has a plurality of spray holes. Adjacent annular spray pipes are connected to each other through pressure equalization pipes, and one of the pressure equalization pipes is connected to the external liquid supply unit through a spray connecting pipe.

[0007] Preferably, the drive structure includes a fixed frame fixed to the top of the filter tank, a speed reducer and a drive motor are fixedly connected to the fixed frame, the output shaft of the drive motor is coaxially connected to the input shaft of the speed reducer, and the output shaft of the speed reducer is coaxially connected to the top of the stirring shaft.

[0008] Preferably, the upper filter structure includes an upper support frame fixed in the middle of the inner side of the filter tank, an upper annular connecting pipe fixedly connected to the upper support frame, and a plurality of upper filter pipes fixedly connected to the top surface of the upper annular connecting pipe, the axis of the upper filter pipe being vertically arranged.

[0009] Preferably, the lower filtration structure includes a lower support frame fixed to the lower part of the inner side of the filter tank, a lower annular connecting pipe fixedly connected to the lower support frame, a plurality of lower filter pipes fixedly connected to the top surface of the lower annular connecting pipe, and the axis of the lower filter pipes being vertically arranged.

[0010] Preferably, the upper and lower filter tubes are sintered high molecular weight polyethylene filter tubes.

[0011] Preferably, the slurry discharge structure includes a slurry discharge pipe communicating with the discharge port, and a slurry discharge auger is provided inside the slurry discharge pipe. The top end of the slurry discharge auger is coaxially connected to the bottom end of the stirring shaft.

[0012] A method of using a filtration device in the separation section of the lithium alumina extract adsorbent, comprising: S1. Feed material into the filter tank from the feed inlet; S2. Start the drive structure to drive the stirring shaft to stir; S3. Perform continuous filtration, feeding the material while filtering it through the upper and lower filtration structures, and collecting the filtrate through the collection tube; S4. After continuous filtration is completed, the feed inlet is closed, and positive pressure filtration is provided to the filter tank by blowing air into the air inlet. S5. After the upper filter structure is fully exposed above the liquid surface, the upper filter structure is closed, and the lower filter structure is used alone for filtration. S6. After the lower filter structure is fully exposed above the liquid surface, reverse the stirring shaft to discharge the slurry from the slurry discharge structure.

[0013] Compared with the prior art, the present invention has the following advantages and technical effects: In this invention, the filtration device achieves material input and air pressure regulation through the feed inlet and air inlet at the top of the filtration tank. The spray structure inside the tank can evenly spray liquid to prevent filter pore blockage. The stirring shaft running through the tank rotates continuously under the drive structure, and its stirring blades effectively break up material agglomerates and promote solid-liquid separation. The upper and lower double-layer filtration structures are located at different heights in the tank. The filtrate is collected into the collection pipe through independent upper and lower drain pipes, forming a multi-stage gradient filtration system, which significantly improves filtration efficiency. The bottom of the stirring shaft is linked to the concentrated slurry discharge structure. Reversing the stirring shaft at the end of filtration will simultaneously activate the bottom discharge function, realizing an integrated operation of filtration-concentration-discharge. This avoids the tediousness of traditional filter cloth replacement and significantly reduces energy consumption through mechanical continuous design. Ultimately, it achieves efficient, stable, and low-cost solid-liquid separation in the separation of lithium adsorbents for alumina extraction.

[0014] Utilizing these structures and methods, this invention provides a filtration device and method for achieving efficient solid-liquid separation, continuous filtration, spray anti-clogging, stirring to promote material dispersion, dual-layer gradient filtration, and integrated discharge in the alumina lithium extraction adsorbent separation section. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the internal structure of the device; Figure 2 This is a schematic diagram of the overall structure of the device; Figure 3 This is a schematic diagram of the process flow of this device.

[0016] The components include: 1. Filter tank; 2. Feed inlet; 3. Spray structure; 4. Drive structure; 5. Stirring shaft; 6. Upper filter structure; 7. Lower filter structure; 8. Thick slurry discharge structure; 9. Upper drain pipe; 10. Lower drain pipe; 11. Collection pipe; 301. Annular spray pipe; 302. Pressure equalization pipe; 401. Fixing frame; 402. Reducer; 403. Drive motor; 601. Upper support frame; 602. Upper annular connecting pipe; 603. Upper filter pipe; 701. Lower support frame; 702. Lower annular connecting pipe; 703. Lower filter pipe; 801. Slurry discharge pipe; 802. Slurry discharge auger. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figures 1 to 3 The present invention discloses a filtration device in the separation section of lithium adsorbent for alumina extraction, comprising: a filter tank 1, the top of the filter tank 1 being provided with a feed inlet 2 and an air inlet, the bottom of the filter tank 1 being provided with a discharge outlet, and the discharge outlet being provided with a concentrated slurry discharge structure 8. The top of the inner side of the filter tank 1 is equipped with a spray structure 3. The inner side of the filter tank 1 is rotatably connected to a stirring shaft 5. The stirring shaft 5 is equipped with stirring blades. The top end of the stirring shaft 5 passes through the filter tank 1 and is connected to the drive structure 4. The bottom end of the stirring shaft 5 is connected to the thick slurry discharge structure 8. The upper part of the inner side of the filter tank 1 is provided with an upper filter structure, which is connected to the collection pipe 11 on the outside of the filter tank 1 through the upper drain pipe 9. The lower part of the inner side of the filter tank 1 is provided with a lower filter structure, which is connected to the collection pipe 11 through the lower drain pipe 10.

[0020] Further optimization of the scheme: the spray structure 3 includes at least two annular spray pipes 301. The annular spray pipes 301 are fixedly connected to the top of the inner side of the filter tank 1. Several spray holes are opened on the bottom surface of the annular spray pipes 301. Adjacent annular spray pipes 301 are connected to each other through equalizing pipes 302. One of the equalizing pipes 302 is connected to the external liquid supply unit through a spray connecting pipe.

[0021] Multiple annular spray pipes 301 are designed with different diameters and are arranged with the same center. They are connected by multiple pressure equalization pipes 302. When liquid is supplied to them, the liquid pressure is transmitted to each annular spray pipe 301 through the pressure equalization pipes 302, and then sprayed through the spray holes provided on them.

[0022] Further optimization of the scheme: the drive structure 4 includes a fixed frame 401 fixed to the top of the filter tank 1. A reducer 402 and a drive motor 403 are fixedly connected to the fixed frame 401. The output shaft of the drive motor 403 is coaxially connected to the input shaft of the reducer 402. The output shaft of the reducer 402 is coaxially connected to the top of the stirring shaft 5.

[0023] Further optimization of the scheme: the upper filter structure 6 includes an upper support frame 601 fixed in the middle of the inner side of the filter tank 1. An upper annular connecting pipe 602 is fixedly connected to the upper support frame 601. Several upper filter pipes 603 are fixedly connected to the top surface of the upper annular connecting pipe 602. The axis of the upper filter pipes 603 is set vertically.

[0024] Further optimization of the scheme: the lower filter structure 7 includes a lower support frame 701 fixed to the lower part of the inner side of the filter tank 1, a lower annular connecting pipe 702 fixedly connected to the lower support frame 701, and a number of lower filter pipes 703 fixedly connected to the top surface of the lower annular connecting pipe 702, with the axis of the lower filter pipes 703 set vertically.

[0025] Both the upper drain pipe 9 and the lower drain pipe 10 are equipped with an electrically controlled valve or other valve structure to enable a quick closed-loop seal when closure is required.

[0026] The design was further optimized so that the upper filter tube 603 and the lower filter tube 703 are sintered high molecular weight polyethylene filter tubes.

[0027] The filter element is made of high molecular weight polyethylene sintered tube, which makes it resistant to high temperature (110°) and strong alkali. It has excellent adaptability under different working conditions. In addition, the high molecular weight polyethylene sintered filter tube can withstand high frequency and high pressure gas-liquid backflushing, has good structural adaptability, and the filter element can be regenerated by strong alkali periodically. It has the advantages of long service life, high stability, high precision and high throughput.

[0028] The scheme is further optimized. The slurry discharge structure 8 includes a slurry discharge pipe 801 connected to the discharge port. The slurry discharge pipe 801 is equipped with a slurry discharge auger 802. The top of the slurry discharge auger 802 is coaxially connected to the bottom of the stirring shaft 5.

[0029] A method of using a filtration device in the separation section of an alumina lithium extraction adsorbent includes: S1. Feed material into filter tank 1 through inlet 2; S2. Start the drive structure 4 to drive the stirring shaft 5 to stir; S3. Perform continuous filtration, feeding the material while filtering it through the upper filtration structure 6 and the lower filtration structure 7, and collecting the filtrate through the collection pipe 11. S4. After continuous filtration is completed, close the feed inlet 2 and provide positive pressure filtration into the filter tank 1 by blowing air into the air inlet. S5. When the upper filter structure 6 is fully exposed above the liquid surface, close the upper filter structure 6 and use the lower filter structure 7 alone for filtration. S6. After the entire filter structure 7 is exposed above the liquid surface, reverse the stirring shaft 5 to discharge the concentrated slurry from the concentrated slurry discharge structure 8. In this step, reversing the stirring shaft 5 not only allows the discharge auger 802 in the concentrated slurry discharge structure 8 to rotate and discharge the concentrated slurry, but also impacts the filter cake on the lower filter tube 703 to remove the filter cake. At this time, negative pressure or other methods can be used to further remove the filter cake.

[0030] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, 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, and therefore should not be construed as a limitation of this invention.

[0031] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A filtration device in the separation section of an alumina lithium extraction adsorbent, characterized in that, include: The filter tank (1) is provided with a feed inlet (2) and an air inlet at the top, and a discharge outlet at the bottom. The discharge outlet is provided with a slurry discharge structure (8). The filter tank (1) has a spray structure (3) on the top of its inner side. The filter tank (1) is rotatably connected to a stirring shaft (5). The stirring shaft (5) has stirring blades. The top of the stirring shaft (5) passes through the filter tank (1) and is connected to the drive structure (4). The bottom of the stirring shaft (5) is connected to the slurry discharge structure (8). The filter tank (1) has an upper filter structure on the upper inner side. The upper filter structure is connected to the collection pipe (11) on the outside of the filter tank (1) through the upper drain pipe (9). The filter tank (1) has a lower filter structure on the lower inner side. The lower filter structure is connected to the collection pipe (11) through the lower drain pipe (10).

2. The filtration device in the separation section of the lithium alumina adsorbent extraction process according to claim 1, characterized in that: The spray structure (3) includes at least two annular spray pipes (301), which are fixedly connected to the top of the inner side of the filter tank (1). The bottom surface of the annular spray pipe (301) is provided with a plurality of spray holes. Adjacent annular spray pipes (301) are connected by equalizing pipes (302), and one of the equalizing pipes (302) is connected to the external liquid supply unit through a spray connecting pipe.

3. The filtration device in the separation section of the lithium extraction adsorbent for alumina as described in claim 1, characterized in that: The drive structure (4) includes a fixed frame (401) fixed at the top of the filter tank (1). A speed reducer (402) and a drive motor (403) are fixedly connected on the fixed frame (401). The output shaft of the drive motor (403) is coaxially connected to the input shaft of the speed reducer (402). The output shaft of the speed reducer (402) is coaxially connected to the top of the stirring shaft (5).

4. The filtration device in the separation section of the lithium extraction adsorbent for alumina as described in claim 1, characterized in that: The upper filter structure (6) includes an upper support frame (601) fixed in the middle of the inner side of the filter tank (1). An upper annular connecting pipe (602) is fixedly connected to the upper support frame (601). A plurality of upper filter pipes (603) are fixedly connected to the top surface of the upper annular connecting pipe (602). The axis of the upper filter pipe (603) is vertically arranged.

5. The filtration device in the separation section of the lithium alumina adsorbent extraction process according to claim 4, characterized in that: The lower filter structure (7) includes a lower support frame (701) fixed to the lower part of the inner side of the filter tank (1). A lower annular connecting pipe (702) is fixedly connected to the lower support frame (701). A number of lower filter pipes (703) are fixedly connected to the top surface of the lower annular connecting pipe (702). The axis of the lower filter pipe (703) is vertically arranged.

6. The filtration device in the separation section of the lithium extraction adsorbent for alumina as described in claim 5, characterized in that: The upper filter tube (603) and the lower filter tube (703) are high molecular weight polyethylene sintered filter tubes.

7. The filtration device in the separation section of the lithium alumina adsorbent extraction process according to claim 1, characterized in that: The slurry discharge structure (8) includes a slurry discharge pipe (801) connected to the discharge port. The slurry discharge pipe (801) is equipped with a slurry discharge auger (802). The top of the slurry discharge auger (802) is coaxially connected to the bottom of the stirring shaft (5).

8. A method of using a filtration device in the separation section of the lithium alumina adsorbent extraction process according to any one of claims 1-7, characterized in that, include: S1. Feed material into the filter tank (1) through the feed inlet (2); S2. Start the drive structure (4) to drive the stirring shaft (5) to stir; S3. Perform continuous filtration, feeding the material while filtering through the upper filtration structure (6) and the lower filtration structure (7), and collecting the filtrate through the collection pipe (11). S4. After continuous filtration is completed, the feed inlet (2) is closed, and positive pressure filtration is provided to the filter tank (1) by blowing air into the air inlet; S5. When the upper filter structure (6) is fully exposed above the liquid surface, close the upper filter structure (6) and use the lower filter structure (7) alone for filtration. S6. When the lower filter structure (7) is fully exposed above the liquid surface, reverse the stirring shaft (5) to discharge the slurry from the slurry discharge structure (8).

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