Titanium-based adsorbent and lithium sink mother liquor multistage dynamic adsorption reaction device

Abstract

The utility model provides a kind of titanium adsorbent and lithium sink mother liquor multistage dynamic adsorption reaction device, including fixed frame table, multiple upper positive cone type adsorption tower and multiple lower inverted cone type adsorption tower.The utility model, by the detachable connection of upper positive cone type adsorption tower and lower inverted cone type adsorption tower, realize multistage adsorption tower flexible assembly and convenient maintenance, cooperate flow mechanism to make adsorbent and lithium sink mother liquor dynamic contact, improve adsorption efficiency;Titanium adsorption filter screen filter hole is designed from top to bottom gradually, can capture different particle size impurities and lithium ion in layer, enhance adsorption precision;Uniform mechanism composed of spray disc and nozzle ensures that mother liquor is evenly distributed, avoids local adsorption uneven;The equal spacing of liquid storage tank, circulating tank and other components and symmetrical layout, optimize fluid path and equipment stability, overall realize lithium resource in lithium sink mother liquor High-efficiency recovery and low consumption stable operation of device.

Description

Technical Field

[0001] This utility model relates to the field of lithium extraction from salt lakes or lithium resource recovery, and in particular to a multi-stage dynamic adsorption reaction device for titanium-based adsorbents and lithium precipitation mother liquor. Background Technology

[0002] Lithium precipitation mother liquor is a high-sodium, low-lithium residual liquid produced during lithium salt production. Its lithium content is typically between 1.5-3.0 g / L, accounting for 15%-30% of the total lithium resources. Due to the presence of large amounts of impurities such as sodium carbonate and sodium sulfate in the mother liquor, traditional lithium extraction methods, such as precipitation and membrane separation, suffer from high energy consumption and low separation efficiency. Titanium-based adsorbents, as a novel functional material, offer advantages such as high selectivity, high adsorption capacity, and good cycle stability, making them particularly suitable for carbonate-type brine systems. A multi-stage dynamic adsorption process, through the series operation of multiple adsorption towers, can achieve gradient enrichment of lithium ions in the mother liquor, improving lithium recovery rate by 10%-15% compared to traditional static adsorption processes.

[0003] Current lithium extraction technologies from lithium-precipitated mother liquor suffer from the following problems: 1. Low adsorbent utilization: Traditional fixed-bed adsorption towers are prone to "tunneling effect," leading to local compaction and pulverization of the adsorbent, thus reducing the effective adsorption area; 2. Uneven liquid distribution: Existing liquid distribution devices struggle to achieve uniform distribution of the mother liquor, resulting in concentration gradient differences within the adsorption tower and premature saturation of local adsorbents; 3. Complex equipment maintenance: The internal structure of the adsorption tower is complex, and packing replacement requires manual disassembly, resulting in long maintenance times. Therefore, we propose a multi-stage dynamic adsorption reaction device for titanium-based adsorbents and lithium-precipitated mother liquor to address these issues. Utility Model Content

[0004] The technical problem to be solved by this invention is to overcome the defects of the existing technology. This invention proposes a multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor.

[0005] To solve the above technical problems, the technical solution adopted by this utility model is: a multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor, including a fixed frame, multiple upper conical adsorption towers and multiple lower inverted conical adsorption towers. The bottom opening of the upper conical adsorption tower and the top opening of the lower inverted conical adsorption tower are detachably connected by multiple bolts in the vertical direction. The fixed frame is provided with a flow mechanism that allows multiple adsorbents to flow in the upper conical adsorption tower and the lower inverted conical adsorption tower.

[0006] The flow mechanism includes multiple liquid storage tanks fixedly installed on the inner wall of the fixed frame. A circulation tank is fixedly installed on the top of the fixed frame. The bottoms of adjacent liquid storage tanks and the top of the upper conical adsorption tower are detachably connected to the bottom of the lower inverted conical adsorption tower and the top of the circulation tank through connecting joints. An inlet pipe is fixedly installed on the top of one of the liquid storage tanks. An alloy pump is fixedly installed at the bottom of the circulation tank. The unidirectional alloy pump is connected and communicated with the adjacent liquid storage tank through a connecting pipe. An outlet pipe is fixedly installed at the outlet of one of the alloy pumps.

[0007] The upper conical adsorption tower and the lower inverted conical adsorption tower are equipped with adsorption mechanisms on their inner sidewalls;

[0008] The adsorption mechanism includes multiple fixed ring blocks fixedly installed on the inner walls of the upper conical adsorption tower and the lower inverted conical adsorption tower. Titanium-based adsorption filters are fixedly installed on the inner walls of the fixed ring blocks, and the filter pore size of the multiple titanium-based adsorption filters gradually decreases from top to bottom.

[0009] The distance between any two adjacent storage tanks is the same, the distance between any two adjacent circulation tanks is the same, and the distance between any two adjacent storage tanks and the distance between any two adjacent circulation tanks are the same.

[0010] A control valve is fixedly installed on the outer wall of the connector.

[0011] The fixed ring block and the titanium adsorption filter are also detachably connected by multiple bolts.

[0012] The distance between any two adjacent titanium-based adsorption filters in the vertical direction is the same.

[0013] A homogenizing mechanism is provided on the inner wall of the upper conical adsorption tower. The homogenizing mechanism includes a spray disc fixedly installed at the top of the upper conical adsorption tower and connected to the connecting joint. Multiple nozzles are fixedly installed at the bottom of the spray disc.

[0014] The upper conical adsorption tower and the spray plate are arranged coaxially.

[0015] Compared with the prior art, the beneficial effects of this utility model include:

[0016] The upper conical adsorption tower and the lower inverted conical adsorption tower are detachably connected by bolts, enabling flexible assembly and convenient maintenance of multi-stage adsorption towers. The flow mechanism allows the adsorbent to dynamically contact the lithium precipitation mother liquor, improving adsorption efficiency. The titanium-based adsorption filter screen has a gradually decreasing pore size from top to bottom, which can capture impurities and lithium ions of different particle sizes in layers, enhancing adsorption precision. The uniform structure composed of spray discs and nozzles ensures uniform distribution of mother liquor and avoids uneven local adsorption. The equal spacing and symmetrical layout of components such as storage tanks and circulation tanks optimize fluid paths and equipment stability, achieving efficient recovery of lithium resources from lithium precipitation mother liquor and low-consumption and stable operation of the device. Attached Figure Description

[0017] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0018] Figure 1 The schematic diagram shows a multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor according to one embodiment of the present invention.

[0019] Figure 2 The schematic diagram shows the bottom structure of the upper conical adsorption tower in a multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor according to one embodiment of the present invention.

[0020] Figure 3 The diagram illustrates the distribution of multiple circulating tanks in a multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor according to one embodiment of the present invention.

[0021] Numbering on the map:

[0022] 1. Fixed frame; 2. Upper conical adsorption tower; 3. Lower inverted conical adsorption tower; 4. Bolts; 5. Storage tank; 6. Circulation tank; 7. Connecting joint; 8. Inlet pipe; 9. Alloy pump; 10. Connecting pipe; 11. Outlet pipe; 12. Fixing ring block; 13. Titanium-based adsorption filter screen; 14. Control valve; 15. Spray plate; 16. Nozzle. Detailed Implementation

[0023] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0024] According to one embodiment of the present invention, in conjunction with Figure 1 As shown. A multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor includes a fixed frame 1, multiple upper conical adsorption towers 2 and multiple lower inverted conical adsorption towers 3. The bottom opening of the upper conical adsorption tower 2 and the top opening of the lower inverted conical adsorption tower 3 are detachably connected by multiple bolts 4.

[0025] To further explain, the upper conical adsorption tower 2 and the lower inverted conical adsorption tower 3 are detachably connected by bolts 4, which facilitates installation, disassembly and maintenance, and allows for flexible combination of different numbers of adsorption towers as needed.

[0026] like Figure 1-3 As shown, a flow mechanism is provided on the fixed frame 1 to allow multiple adsorbents to flow in the upper conical adsorption tower 2 and the lower inverted conical adsorption tower 3. The flow mechanism includes multiple storage tanks 5 fixedly installed on the inner wall of the fixed frame 1. A circulation tank 6 is fixedly installed on the top of the fixed frame 1. The bottom of adjacent storage tanks 5 and the top of the upper conical adsorption tower 2 are detachably connected to the bottom of the lower inverted conical adsorption tower 3 and the top of the circulation tank 6 through connecting joints 7. An inlet pipe 8 is fixedly installed on the top of one of the storage tanks 5. An alloy pump 9 is fixedly installed on the bottom of the circulation tank 6. The one-way alloy pump 9 and the adjacent storage tank 5 are connected and communicated through a connecting pipe 10. An outlet pipe 11 is fixedly installed at the outlet of one of the alloy pumps 9.

[0027] To further explain, the flow mechanism enables the adsorbent to flow dynamically within the adsorption tower, ensuring full contact with the lithium precipitation mother liquor. The multi-stage adsorption tower structure allows for multi-stage dynamic adsorption, improving adsorption efficiency and lithium recovery rate.

[0028] like Figure 1 and Figure 3 As shown, the distance between any two adjacent storage tanks 5 is the same, the distance between any two adjacent circulation tanks 6 is the same, and the distance between any two adjacent storage tanks 5 and the distance between any two adjacent circulation tanks 6 are the same.

[0029] like Figure 1 As shown, a control valve 14 is fixedly installed on the outer wall of the connecting joint 7.

[0030] To further explain, this design allows for convenient control of fluid flow and volume, facilitating precise control of the adsorption process. It also allows for flexible adjustment of the flow path and flow rate of the lithium precipitation mother liquor and adsorbent according to actual production needs, thereby improving the operational stability and controllability of the device.

[0031] To further explain, this design facilitates the neat layout and space utilization of the device, makes it easier for pipe connections and fluid transport, and makes the entire device structure more compact and reasonable. It also helps the fluid to be evenly distributed and flow among the various components.

[0032] like Figure 1 As shown, an adsorption mechanism is provided on the inner wall of the upper conical adsorption tower 2 and the lower inverted conical adsorption tower 3. The adsorption mechanism includes multiple fixed ring blocks 12 fixedly installed on the inner wall of the upper conical adsorption tower 2 and the lower inverted conical adsorption tower 3. A titanium adsorption filter screen 13 is fixedly installed on the inner wall of the fixed ring block 12. The filter pore size of the multiple titanium adsorption filter screens 13 gradually decreases from top to bottom.

[0033] To further explain, the pores of the titanium-based adsorption filter 13 in the adsorption mechanism gradually decrease from top to bottom, which allows titanium-based adsorbents of different particle sizes to play their role at different positions. Initial adsorption is performed by the filter with larger pores first, and then fine adsorption is performed by the filter with smaller pores, thereby improving the adsorption effect on lithium ions in the lithium precipitation mother liquor.

[0034] like Figure 1 As shown, the fixed ring block 12 and the titanium adsorption filter screen 13 are also detachably connected by multiple bolts 4.

[0035] To further explain, this design facilitates the replacement of the titanium-based adsorption filter 13. When the filter becomes clogged, damaged, or its adsorption performance declines, it can be replaced in a timely manner to ensure the normal operation and adsorption effect of the adsorption device and reduce maintenance costs.

[0036] like Figure 1 and Figure 2 As shown, the distance between two adjacent titanium-based adsorption filters 13 in the vertical direction is the same.

[0037] To further explain, this design helps to ensure that the adsorbent is evenly distributed in the adsorption tower, so that the lithium precipitation mother liquor and the adsorbent can be in full and uniform contact, avoiding local over- or under-adsorption, and further improving the adsorption effect and stability.

[0038] like Figure 1 and Figure 2 As shown, a homogenizing mechanism is provided on the inner wall of the upper conical adsorption tower 2. The homogenizing mechanism includes a spray plate 15 fixedly installed at the top of the upper conical adsorption tower 2 and connected to the connecting joint 7. Multiple nozzles 16 are fixedly installed at the bottom of the spray plate 15.

[0039] To further explain, the spray plate 15 and nozzle 16 in the uniform mechanism can uniformly spray the lithium precipitation mother liquor or adsorbent entering the upper conical adsorption tower 2 into the tower, thereby achieving uniform distribution of materials.

[0040] like Figure 1 As shown, the upper conical adsorption tower 2 and the spray plate 15 are arranged coaxially.

[0041] To further explain, this design can better ensure the uniformity of spraying, making the adsorption conditions of the material consistent at all locations within the tower, improving the consistency of adsorption efficiency and adsorption effect, and reducing adsorption differences caused by uneven material distribution.

[0042] The functional principle of this utility model can be explained through the following operation methods:

[0043] I. Symmetrical assembly installation before device startup

[0044] Symmetrical construction of adsorption tower groups

[0045] Select the same number of upper conical adsorption towers 2 (hereinafter referred to as "upper towers") and lower inverted conical adsorption towers 3 (hereinafter referred to as "lower towers") according to the processing requirements. For example, if a 3-stage adsorption device needs to be built, take 3 upper towers and 3 lower towers.

[0046] The vertical structure is stacked layer by layer in the form of "upper tower + lower tower". Each group is connected and fixed by bolts 4 at the bottom and top of the tower, and connected by connecting pipes 10 to form a symmetrical multi-level tower group (for example, when 3 groups are stacked, the overall structure is upper tower 1 → lower tower 1 → connecting pipe 10 → upper tower 2 → lower tower 2 → connecting pipe 10 → upper tower 3 → lower tower 3).

[0047] Advantages: Equal quantities ensure consistent fluid flow paths in each level of the tower group, avoiding pressure imbalances or adsorption blind spots caused by asymmetry between levels.

[0048] Symmetrical connection of fluid pipelines

[0049] Each upper tower is connected to a storage tank 5 at the top, and each lower tower is connected to a circulation tank 6 at the bottom, forming an independent unit pipeline of "storage tank 5 - upper tower - lower tower - circulation tank 6".

[0050] The circulation tank 6 of the adjacent unit and the storage tank 5 of the next unit are connected in series through the alloy pump 9 and the connecting pipe 10 (e.g., circulation tank 6 → alloy pump 9 → storage tank 5 → upper tower 2 → lower tower 2 → circulation tank 6) to ensure that the multi-stage pipeline is symmetrical and the fluid direction is consistent.

[0051] Key points of operation: When connecting, it is necessary to confirm that the position of each tower group corresponds to the corresponding liquid storage tank 5 and circulation tank 6 to avoid cross-connection of pipelines.

[0052] II. Symmetrical Adsorbent Loading and Mother Liquor Distribution

[0053] Symmetrical filling and fixing of filter screens

[0054] Each upper and lower tower is filled with titanium-based adsorption filter screen 13 according to the principle of "the filter pores gradually decrease from top to bottom", and the filter screen pore size distribution of the same level tower (such as upper tower 1 and upper tower 2, lower tower 1 and lower tower 2) is consistent.

[0055] Example: All upper column first-layer filters have a pore size of 50μm, middle layer 30μm, and lower layer 10μm; all lower column first-layer filters have a pore size of 30μm, and lower layer 10μm (can be adjusted according to requirements, but the filter configuration of the same level of column must be the same).

[0056] Objective: To ensure consistent adsorption capacity in symmetrical tower groups and avoid overall efficiency imbalance caused by differences in individual tower filters.

[0057] Symmetrical introduction and uniform distribution of mother liquor

[0058] Lithium-precipitated mother liquor is injected into the first storage tank 5 through the inlet pipe 8. Then, the control valves 14 of each level of storage tank 5 and the corresponding upper tower are opened in sequence. The mother liquor flow rate is balanced within the same level tower group by utilizing the conical structure of the tower body (the upper tower's positive cone accelerates liquid diffusion, while the lower tower's inverted cone slows down the flow rate).

[0059] For example, when the three towers are running, the inlet flow rate of each tower is adjusted by valves to ensure that it is 1 / 3 of the total flow rate, thus ensuring that the adsorption load of each stage is consistent.

[0060] III. Symmetrical Multi-stage Dynamic Adsorption Operation

[0061] Adsorption process within a single tower

[0062] After the mother liquor is evenly sprayed by the spray plate 15 at the top of the upper tower, it diffuses along the positive cone wall towards the bottom of the tower. First, it is initially adsorbed by the large-pore filter screen in the upper layer, which adsorbs large particles of impurities and some lithium ions. Then, it is finely adsorbed by the small-pore filter screen in the lower layer.

[0063] The liquid flowing into the lower column has a slower flow rate due to the inverted cone structure (small lower opening and large upper opening), which forms a vortex inside the column, prolonging the contact time with the filter screen and achieving secondary adsorption.

[0064] Key parameters: The total adsorption residence time for a single tower (upper tower + lower tower) is recommended to be ≥30 minutes (15 minutes for upper tower + 15 minutes for lower tower), which can be controlled by adjusting the flow rate through valves.

[0065] Symmetrical Cycle of Multi-Stage Towers

[0066] The liquid discharged from each group of lower towers is pressurized by the alloy pump 9 in the circulation tank 6 and then symmetrically input into the next group of storage tanks 5 (such as circulation tank 6 → storage tank 5, circulation tank 6 → storage tank 5), forming a "step-by-step" adsorption path.

[0067] If recirculation adsorption is required (e.g., the final stage treated liquid does not meet the standards), the final stage recirculation tank 6 can be connected to the first stage storage tank 5 through pipelines to form a closed loop. At this time, all tower groups participate in the circulation synchronously to ensure that the adsorption intensity of each stage is consistent.

[0068] IV. Symmetrical Maintenance and Troubleshooting

[0069] Group-based shutdown and tiered maintenance

[0070] When shutting down, operate in "groups". For example, when maintaining the second group of towers (upper tower 2 + lower tower 2), only close the valves of the storage tank 5 and the circulation tank 6, while keeping the other groups running to avoid shutting down the entire unit.

[0071] When replacing the filter, disassemble it layer by layer in the order of "upper tower → lower tower". The filters of the same level tower (such as upper tower 1 and upper tower 2) need to be checked or replaced at the same time to ensure symmetrical adsorption performance.

[0072] Symmetrical fault diagnosis

[0073] If an abnormal flow occurs in a certain tower group (such as the liquid level in storage tank 5 dropping too quickly), first check whether the nozzle 16 of the corresponding upper tower is blocked and whether the filter screen of the lower tower is damaged. At the same time, compare the operating parameters (such as flow rate and pressure) of other tower groups of the same level to quickly locate the fault point.

[0074] For example, if nozzle 16 of the upper column 2 is blocked, the liquid level in its corresponding storage tank 5 will rise abnormally, while the liquid levels in other storage tanks 5 are normal, which can quickly pinpoint the problematic column group.

[0075] V. The core advantage of quantity parity

[0076] Structural stability: The symmetrical tower group is connected by bolts 4 to form a rigid whole, avoiding tilting or leakage of the device caused by unbalanced weight on one side.

[0077] Fluid uniformity: The inlet flow rate and adsorption path of the same level tower group are completely consistent, which can eliminate the "flow deviation" phenomenon (i.e., the liquid flows to a certain level tower group in a concentrated manner) and ensure that the adsorption efficiency of each level is balanced.

[0078] High efficiency in maintenance: The group-based maintenance and synchronous filter replacement mode can significantly shorten downtime, making it especially suitable for continuous production scenarios.

[0079] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor, characterized in that, It includes a fixed frame (1), multiple upper conical adsorption towers (2) and multiple lower inverted conical adsorption towers (3). The bottom opening of the upper conical adsorption tower (2) and the top opening of the lower inverted conical adsorption tower (3) are detachably connected by multiple bolts (4) in the vertical direction. The fixed frame (1) is provided with a flow mechanism that allows multiple adsorbents to flow in the upper conical adsorption tower (2) and the lower inverted conical adsorption tower (3). The flow mechanism includes multiple storage tanks (5) fixedly installed on the inner wall of the fixed frame (1). A circulation tank (6) is fixedly installed on the top of the fixed frame (1). The bottom of the adjacent storage tanks (5) and the top of the upper conical adsorption tower (2) are detachably connected to the bottom of the lower inverted conical adsorption tower (3) and the top of the circulation tank (6) through connecting joints (7). An inlet pipe (8) is fixedly installed on the top of one of the storage tanks (5). An alloy pump (9) is fixedly installed at the bottom of the circulation tank (6). The unidirectional alloy pump (9) is connected and communicated with the adjacent storage tanks (5) through connecting pipes (10). An outlet pipe (11) is fixedly installed at the outlet of one of the alloy pumps (9). The upper conical adsorption tower (2) and the lower inverted conical adsorption tower (3) are provided with adsorption mechanisms on their inner sidewalls; The adsorption mechanism includes multiple fixed ring blocks (12) fixedly installed on the inner sidewalls of the upper conical adsorption tower (2) and the lower inverted conical adsorption tower (3). The inner sidewalls of the fixed ring blocks (12) are fixedly installed with titanium adsorption filters (13), and the filter pore size of the multiple titanium adsorption filters (13) gradually decreases from top to bottom.

2. The multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor according to claim 1, characterized in that, The distance between any two adjacent storage tanks (5) is the same, the distance between any two adjacent circulation tanks (6) is the same, and the distance between any two adjacent storage tanks (5) and the distance between any two adjacent circulation tanks (6) are the same.

3. The multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor according to claim 1, characterized in that, A control valve (14) is fixedly installed on the outer wall of the connecting joint (7).

4. The multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor according to claim 1, characterized in that, The fixed ring block (12) and the titanium adsorption filter screen (13) are also detachably connected by multiple bolts (4).

5. The multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor according to claim 1, characterized in that, The distance between two adjacent titanium-based adsorption filters (13) in the vertical direction is the same.

6. The multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor according to claim 1, characterized in that, A homogenizing mechanism is provided on the inner wall of the upper conical adsorption tower (2). The homogenizing mechanism includes a spray plate (15) fixedly installed at the top of the upper conical adsorption tower (2) and connected to the connecting joint (7). Multiple nozzles (16) are fixedly installed at the bottom of the spray plate (15).

7. The multi-stage dynamic adsorption reaction device for titanium-based adsorbent and lithium precipitation mother liquor according to claim 6, characterized in that, The upper conical adsorption tower (2) and the spray plate (15) are arranged coaxially.

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