A system for reducing lithium entrainment in a lithium precipitation mother liquor

Abstract

The utility model relates to lithium carbonate production technical field, the utility model provides a system of reducing lithium entrainment in lithium precipitation mother liquor, it includes the lithium precipitation reaction kettle for mixing sodium carbonate solution and sodium sulfate, lithium sulfate raw material, lithium precipitation reaction kettle includes jar body, is used to accommodate reaction raw material, still includes stirring rod body, one end of stirring rod body is rotatively established at the top of jar body for being connected with rotary drive spare, the other end extends to jar body bottom, is equipped with stirring paddle no.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of lithium carbonate production technology, specifically to a system for reducing the amount of lithium entrained in lithium precipitation mother liquor. Background Technology

[0002] In lithium extraction processes, the lithium precipitation step is a crucial step in converting lithium elements in a lithium-containing solution into solid lithium salt precipitates. This is typically achieved by adding sodium carbonate solution to a lithium sulfate-containing feed solution, causing lithium ions to react with carbonate ions to form lithium carbonate precipitate. However, uneven mixing within the reaction system can lead to incomplete local reactions, resulting in some lithium elements failing to fully precipitate and remaining in the mother liquor. Furthermore, if the precipitate particles agglomerate, they can carry a large amount of mother liquor, increasing the amount of lithium entrained in the mother liquor, wasting lithium resources, and increasing the difficulty and cost of subsequent mother liquor treatment. Existing lithium precipitation reactors often employ a unidirectional stirring structure. During stirring, materials tend to form directional circulation, leading to insufficient mixing of raw materials in different areas and low reaction efficiency. Moreover, a single stirring direction has limited effect on dispersing precipitate particles, making it difficult to effectively suppress particle agglomeration, thus affecting the lithium precipitation rate and the control of lithium entrainment in the mother liquor. Therefore, how to improve the uniformity of material mixing and reduce the agglomeration of precipitated particles by optimizing the structure of the lithium precipitation reaction device, thereby reducing the amount of lithium entrained in the lithium precipitation mother liquor, has become an urgent problem to be solved in this field. Utility Model Content

[0003] To overcome the above-mentioned defects, embodiments of this utility model provide a system for reducing the amount of lithium entrained in lithium precipitation mother liquor, which solves the technical problem of insufficient mixing of reaction raw materials in the lithium precipitation reactor in the prior art.

[0004] According to one aspect, at least one embodiment of the present invention provides a system for reducing the lithium entrainment in lithium precipitation mother liquor, comprising a lithium precipitation reactor, the lithium precipitation reactor being used for mixing sodium carbonate solution and sodium sulfate and lithium sulfate raw materials, the lithium precipitation reactor comprising:

[0005] A tank, the tank being used to contain the reaction raw materials;

[0006] A stirring rod, one end of which is rotatably mounted on the top of the tank for connection with a rotating drive component, and the other end extending to the bottom of the tank, with a stirring paddle mounted on the stirring rod;

[0007] A sleeve is rotatably mounted on the stirring rod. A transmission component is provided on the sleeve and located inside the tank. The transmission component can drive the sleeve to rotate in the opposite direction to the rotation of the stirring rod. A second stirring paddle is provided on the sleeve.

[0008] For example, in a system for reducing lithium entrainment in lithium precipitation mother liquor provided by at least one embodiment of the present invention, the transmission component includes:

[0009] A connecting frame is disposed on the inner wall of the tank.

[0010] An intermediate drive wheel is rotatably mounted on the connecting frame.

[0011] Gear 1 is mounted on the stirring rod and can rotate coaxially with the stirring rod. Gear 1 meshes with the intermediate transmission wheel.

[0012] Gear 2, which is mounted on the sleeve and can drive the sleeve to rotate, and gear 2 is meshed with the intermediate transmission wheel;

[0013] The intermediate transmission wheel, gear one, and gear two are all bevel gears, and the rotation axis of the intermediate transmission wheel is perpendicular to the rotation axes of gear one and gear two, so that gear one and gear two rotate in opposite directions.

[0014] For example, in a system for reducing lithium entrainment in lithium precipitation mother liquor provided by at least one embodiment of the present invention, the system further includes:

[0015] A transfer tank, which is used to receive the material after the reaction in the lithium precipitation reactor;

[0016] A transfer mixing component is rotatably disposed inside the transfer tank and is used to mix the materials inside the transfer tank.

[0017] For example, in a system for reducing lithium entrainment in lithium precipitation mother liquor provided by at least one embodiment of the present invention, the system further includes:

[0018] A raw material transfer pump is used to transfer the material in the lithium precipitation reactor to the transfer tank.

[0019] For example, in a system for reducing lithium entrainment in lithium precipitation mother liquor provided by at least one embodiment of the present invention, the system further includes:

[0020] The three-in-one unit is used to receive materials in the transfer tank. The three-in-one unit can separate the lithium mother liquor from the lithium carbonate crystals after the materials are subjected to primary pressure filtration with compressed air, secondary pressure filtration with high temperature pure water, and filter cake drying.

[0021] A transfer pump is used to transport materials from the transfer tank to the three-in-one unit.

[0022] For example, in a system for reducing lithium entrainment in lithium precipitation mother liquor provided by at least one embodiment of the present invention, the system further includes:

[0023] The lithium deposition reactor is equipped with a jacket. The upper part of the jacket is connected to a steam pipe, and the lower part is connected to a condensate pipe. The jacket is used to introduce steam.

[0024] For example, in a system for reducing lithium entrainment in lithium precipitation mother liquor provided by at least one embodiment of the present invention, the stirring paddle is provided with at least one blade along the circumference of the rod body, and the blade is inclined.

[0025] The stirring paddle two is provided with at least one blade two along the circumference of the sleeve, and the blade two is inclined.

[0026] For example, in a system for reducing lithium entrainment in lithium precipitation mother liquor provided by at least one embodiment of the present invention, the first impeller and the second impeller are tilted in the same direction, which enables the materials in the stirring area of ​​the first impeller and the stirring area of ​​the second impeller to come close to each other and mix thoroughly.

[0027] For example, in a system for reducing lithium entrainment in lithium precipitation mother liquor provided by at least one embodiment of the present invention, the material inlet of the lithium precipitation reactor is equipped with a flow meter and a regulating valve to control the proportion of material entering the lithium precipitation reactor.

[0028] For example, in a system for reducing lithium entrainment in lithium precipitation mother liquor provided by at least one embodiment of the present invention, an isolation box is also included. The isolation box is disposed in the tank body, and the connecting frame, the first gear, the second gear and the intermediate transmission wheel are all disposed in the isolation box.

[0029] The beneficial effects of the embodiments of this utility model are as follows:

[0030] In this invention, the stirring rod drives the first stirring paddle to rotate, while the sleeve rotates in the opposite direction under the action of the transmission component, causing the second stirring paddle to form a counter-stirring with the first stirring paddle. This counter-stirring method can significantly enhance the turbulence of the materials inside the tank, allowing the sodium carbonate solution to mix more evenly and have more thorough contact with the sodium sulfate and lithium sulfate raw materials, thereby improving reaction efficiency and lithium precipitation conversion rate. The counter-rotating stirring paddles one and two can shear the precipitated particles generated by the reaction, reducing particle agglomeration and making the precipitated particles more uniform in size, thus reducing the probability of particles carrying lithium elements from the mother liquor due to agglomeration. In addition, the flow field generated by counter-stirring can reduce material residue at the bottom and inner wall of the tank, allowing more lithium elements to participate in the reaction and precipitate, further reducing the amount of lithium entrained in the mother liquor, improving the utilization rate of lithium resources, and reducing the cost of subsequent mother liquor treatment. Attached Figure Description

[0031] 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.

[0032] Figure 1 This is a schematic diagram of a system for reducing the amount of lithium entrained in lithium precipitation mother liquor according to one embodiment of the present invention;

[0033] Figure 2 for Figure 1 A schematic diagram of the structure of a lithium precipitation reactor for a system to reduce the amount of lithium entrainment in lithium precipitation mother liquor in an embodiment of the present invention.

[0034] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the embodiment;

[0035] In the diagram: 1. Lithium deposition reactor; 11. Tank body; 12. Stirring rod; 121. Stirring paddle one; 1211. Paddle blade one; 13. Sleeve; 131. Stirring paddle two; 1311. Paddle blade two; 14. Transmission component; 141. Connecting frame; 142. Intermediate transmission wheel; 143. Gear one; 144. Gear two; 2. Rotary drive component; 3. Transfer tank; 31. Transfer stirring component; 4. Raw material transfer pump; 5. Three-in-one unit; 6. Transfer pump; 7. Jacket; 8. Flow meter; 9. Regulating valve; 100. Isolation box. Detailed Implementation

[0036] 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.

[0037] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] like Figures 1-3As shown, this invention illustrates a system for reducing lithium entrainment in lithium precipitation mother liquor according to one embodiment. In the lithium precipitation stage of the lithium extraction process, a lithium precipitation reactor 1 is designed to achieve thorough mixing of sodium carbonate solution with sodium sulfate and lithium sulfate raw materials. The lithium precipitation reactor 1 is based on a tank body 11, which serves as a spatial carrier for containing the reaction raw materials and is in the shape of a vertical cylinder. One end of a stirring rod 12 is mounted on the top of the tank body 11 via a rotatable connection structure such as a bearing, and the other end extends to the bottom of the tank body 11. The top of the stirring rod 12 is connected to a rotating drive component 2, which can be a combination of a motor and a reducer. When the motor is running, the reducer reduces the speed and increases the torque, driving the stirring rod 12 to rotate stably. A stirring paddle 121 is mounted on the stirring rod 12. A sleeve 13 is fitted onto the stirring rod 12 via a rotatable connection structure such as a bearing, and can rotate relative to the stirring rod 12. A second stirring paddle 131 is mounted on the sleeve 13. A raised annular structure can be machined above and below the sleeve corresponding to the stirring rod. After the sleeve is fitted onto the stirring rod, its upper and lower end faces contact the sides of the two annular protrusions, respectively. In this way, during the rotation of the sleeve, regardless of whether it is subjected to upward or downward axial force, it will be blocked by the protrusions and cannot move axially. A transmission component 14 is provided on the sleeve 13. The transmission component 14 is located inside the tank 11. Its structure is designed such that the connecting frame 141 is fixed to the inner wall of the tank 11, which serves as a support.

[0043] The intermediate drive wheel 142 is rotatably mounted on the connecting frame 141 via bearings; gear one 143 is mounted on the stirring rod 12, coaxial with the stirring rod 12, and rotates together with the stirring rod 12, and gear one 143 meshes with the intermediate drive wheel 142; gear two 144 is mounted on the sleeve 13, which can drive the sleeve 13 to rotate, and gear two 144 also meshes with the intermediate drive wheel 142. The intermediate drive wheel 142, gear one 143, and gear two 144 are all bevel gears, and the rotation axis of the intermediate drive wheel 142 is perpendicular to the rotation axes of gear one 143 and gear two 144. When the stirring rod 12 rotates and drives gear one 143 to rotate, the intermediate drive wheel 142 drives gear two 144 to drive the sleeve 13 to rotate in the opposite direction to the stirring rod 12. A smaller stirring paddle can be added to the bottom of the tank to specifically enhance the fluidity of the local liquid, redistribute the deposited particles into the mother liquor, and prevent them from accumulating in the tank to form hard scale. This not only reduces the frequency and difficulty of cleaning the bottom of the tank, but also prevents sediment from clogging subsequent pipes, valves or pumps, ensuring production continuity.

[0044] In the transmission component 14, the connecting frame 141 is fixed to the inner wall of the tank 11 by welding or bolting to ensure its stability. The connecting frame can be designed as a U-shaped structure, with the two side walls of the U-shaped structure supporting the two ends of the intermediate transmission wheel respectively. Compared with a single support structure, it can better withstand the radial and axial forces generated by the intermediate transmission wheel during meshing, reducing the shaking of the intermediate transmission wheel and ensuring its stability in meshing with gear 143 and gear 2 144, thereby ensuring the synchronicity and reliability of the counter-rotation of the sleeve and the stirring rod. The intermediate transmission wheel 142 is mounted on the connecting frame 141 by bearings and can rotate on the connecting frame 141. Gear 143 is mounted on the stirring rod 12 by key connection or other means to ensure synchronous rotation with the stirring rod 12. Gear 2 144 is mounted on the sleeve 13 by key connection or other means to drive the sleeve 13 to rotate. When the stirring rod 12 rotates, the gear 143 rotates accordingly. Since the gear 143 meshes with the intermediate transmission wheel 142, the intermediate transmission wheel 142 is driven to rotate. Since the intermediate transmission wheel 142 meshes with the gear 144, the gear 144 drives the sleeve 13 to rotate in the opposite direction.

[0045] This transmission structure, consisting of a connecting frame 141, an intermediate transmission wheel 142, gear one 143, and gear two 144, achieves the reverse rotation of the stirring rod 12 and the sleeve 13 through the meshing transmission between bevel gears. The special structural design of the bevel gears can change the transmission direction within a limited space, and the transmission is smooth and reliable. Compared with other complex transmission methods, the structure is simple and compact, occupies little space inside the tank 11, and can effectively transmit torque, ensuring that the stirring paddle one 121 and stirring paddle two 131 stably stir the material in opposite directions, further improving the uniformity of material mixing and reaction efficiency.

[0046] The working process of the lithium precipitation mother liquor tank 1 is as follows: The drive unit 2 is activated, causing the stirring rod 12 to rotate. The first stirring paddle 121 then rotates to stir the material. Simultaneously, the gear 143 on the stirring rod 12 rotates, driving the second gear 144 via the intermediate transmission wheel 142, causing the sleeve 13 to rotate in the opposite direction. The second stirring paddle 131 also begins to stir the material. Under this bidirectional stirring action, the sodium carbonate solution, sodium sulfate, and lithium sulfate raw materials are fully mixed and reacted within the tank 11. During the lithium precipitation reaction, the stirring rod 12 and the sleeve 13 drive their respective stirring paddles to rotate in opposite directions, forming a unique stirring pattern. The inclined arrangement of the first stirring paddle 121 and the second stirring paddle 131 ensures that the material not only experiences horizontal stirring but also vertical flow during the stirring process, increasing the flow range of the material within the tank 11. This results in more thorough mixing of the material, effectively avoiding incomplete local reactions caused by uneven mixing. More lithium elements participate in the reaction to form precipitate, reducing the residual lithium content in the mother liquor. Meanwhile, the counter-rotating agitator has a shearing effect on the precipitated particles generated by the reaction, which can effectively reduce particle agglomeration. The precipitated particles are more uniform in size, which reduces the probability of particles carrying lithium elements from the mother liquor due to agglomeration. This reduces the amount of lithium carried in the lithium precipitation mother liquor, improves the utilization rate of lithium resources, and reduces the cost of subsequent mother liquor treatment.

[0047] Based on the lithium deposition reactor 1, a transfer tank 3 is added. The transfer tank 3 is connected to the discharge port of the lithium deposition reactor 1 via a pipeline, and valves can be installed on the pipeline to control material conveying. The stirring method in the transfer tank 3 can be the same as or different from that in the lithium deposition reactor 1. One end of the transfer stirring component 31 is set at the top of the transfer tank 3 via a rotatable connection structure such as a bearing, and the other end extends to the bottom of the transfer tank 3. The transfer stirring component 31 includes a stirring shaft and stirring blades. The top of the stirring shaft is connected to a drive motor. The drive motor drives the stirring shaft to rotate, thereby causing the stirring blades to stir the material conveyed from the lithium deposition reactor 1 in the transfer tank 3. The material after the reaction in the lithium deposition reactor 1 enters the transfer tank 3. The transfer stirring component 31 continuously stirs the material, which can prevent the material from settling and stratifying in the transfer tank 3, ensuring the uniformity of the material and providing stable and uniform material for subsequent processes. At the same time, the transfer tank 3 acts as a buffer, which can regulate the production rhythm of the lithium deposition reactor 1 and subsequent processes, improving the stability and continuity of the entire production process. A raw material transfer pump 4 is installed on the material conveying pipeline between the lithium deposition reactor 1 and the transfer tank 3. The inlet of the raw material transfer pump 4 is connected to the outlet of the lithium deposition reactor 1, and the outlet is connected to the inlet of the transfer tank 3. The raw material transfer pump 4 can be a centrifugal pump or similar type. It is driven by a motor to rotate the impeller, generating a pressure difference to transport the material in the lithium deposition reactor 1 to the transfer tank 3. The conveying flow rate can be controlled by adjusting the motor speed. The raw material transfer pump 4 provides power for the conveying of material from the lithium deposition reactor 1 to the transfer tank 3, ensuring timely and efficient material delivery and preventing material accumulation in the lithium deposition reactor 1, which would affect the reaction process. Furthermore, by controlling the flow rate of the transfer pump, the material conveying speed can be adjusted according to the capacity of the transfer tank 3 and the processing capacity of subsequent processes, further optimizing the production process.

[0048] The three-in-one unit 5 is connected to the transfer tank 3 via a pipeline, and a transfer pump 6 is installed on the pipeline. The inlet of the transfer pump 6 is connected to the outlet of the transfer tank 3, and the outlet is connected to the inlet of the three-in-one unit 5. The transfer pump 6 can be a screw pump or other pump type suitable for conveying materials containing solid particles. The screw is driven by a motor to rotate, conveying the material in the transfer tank 3 to the three-in-one unit 5. The three-in-one unit 5 has functions of primary pressure filtration with compressed air, secondary pressure filtration with high-temperature pure water, and filter cake drying. It has corresponding pressure filtration chambers, compressed air pipelines, high-temperature pure water pipelines, and drying devices. When the material enters the three-in-one unit 5, it undergoes primary pressure filtration with compressed air in sequence, using the pressure of compressed air to squeeze out most of the mother liquor from the material; then, it undergoes secondary pressure filtration with high-temperature pure water to further clean the filter cake and remove residual impurities; finally, the filter cake is dried by the drying device to achieve efficient separation of lithium precipitation mother liquor and lithium carbonate crystals.

[0049] A jacket 7 is installed outside the lithium precipitation reactor 1, tightly enclosing the tank body 11 of the reactor 1. The upper part of the jacket 7 has an interface for connecting to a steam pipe, and the lower part has an interface for connecting to a condensate pipe. When heating of the material inside the reactor is required, steam enters the jacket 7 through the steam pipe, flows within the jacket 7, and indirectly heats the material inside through the wall of the tank body 11. The condensate formed after the steam condenses is discharged from the condensate pipe at the bottom of the jacket 7. The design of introducing steam into the jacket 7 provides a stable heating environment for the lithium precipitation reaction. A suitable reaction temperature helps to increase the reaction rate, allowing the sodium carbonate solution to react more fully with the sodium sulfate and lithium sulfate raw materials, promoting the formation of lithium precipitation, and further reducing the residual lithium content in the lithium precipitation mother liquor. The blades 1211 of the first agitator 121 are distributed circumferentially along the agitator rod 12. The number is determined according to the diameter of the tank 11 and the reaction requirements, with at least one blade. Blade 1211 is fixed to the agitator rod 12 by welding or bolting, and is inclined, with an inclination angle generally between 15° and 45°, which can be adjusted according to the material characteristics and reaction requirements. The blades 1311 of the second agitator 131 are distributed circumferentially along the sleeve 13, with at least one blade. They are also fixed to the sleeve 13 by welding or bolting, and are inclined. Blade 1211 and blade 1311 are inclined in the same direction, for example, both inclined clockwise (or both inclined counterclockwise), and the inclination angle is set to be the same or similar depending on the actual situation. During the mixing process, when the first agitator 121 rotates, its blades 1211 push the material to flow in an oblique direction. When the second agitator 131 rotates, its blades 1311 push the material to flow in the opposite oblique direction, causing the materials in the mixing areas of the first agitator 121 and the second agitator 131 to move closer together and mix thoroughly. The blades with the same inclination direction enhance the material's aggregation and mixing effect. The agitator 121 and the second agitator 131 push the material to flow in the same oblique direction, accelerating the aggregation of materials from different areas, further improving the uniformity and speed of material mixing, promoting a faster and more complete reaction, and more effectively reducing the amount of lithium entrained in the lithium precipitation mother liquor, thus improving lithium precipitation efficiency and product quality. At the material inlet of the lithium precipitation reactor 1, a flow meter 8 and a regulating valve 9 are installed respectively. The flow meter 8, which can be an electromagnetic flow meter or similar type, is installed on the material conveying pipeline to monitor the material flow rate entering the lithium precipitation reactor 1 in real time and transmit the flow data to the control system. The regulating valve 9 is installed on the material conveying pipeline downstream of the flow meter 8. It can be an electric regulating valve or the like. By receiving the control signal issued by the control system based on the preset material ratio and the feedback data from the flow meter, the valve opening is adjusted to control the material ratio entering the lithium precipitation reactor 1.

[0050] An isolation box 100 is installed inside the tank 11, and the isolation box 100 is fixed in a suitable position inside the tank 11 by welding or bolting. The connecting frame 141, gear one 143, gear two 144, and intermediate transmission wheel 142 are all located inside the isolation box 100. The wall of the isolation box 100 has through holes for the stirring rod 12 and sleeve 13 to pass through. Sealing devices, such as sealed bearings, are installed at the through holes to prevent materials from entering the isolation box 100 and affecting the normal operation of the transmission components. The isolation box 100 isolates the transmission component 14 from the reactants, preventing corrosion and wear of the transmission components, extending their service life, ensuring the stability and reliability of the transmission structure, and thus ensuring the continuous and stable counter-rotation of the stirring rod 12 and sleeve 13. This maintains efficient mixing of materials and the normal progress of the reaction, reduces equipment maintenance costs, and improves production efficiency.

[0051] like Figure 1 As shown, the system operation process for reducing lithium entrainment in lithium precipitation mother liquor is as follows:

[0052] First, sodium carbonate solution and sodium sulfate and lithium sulfate raw materials enter tank 11 through the material inlet of lithium precipitation reactor 1. Flow meter 8 at the inlet monitors the material flow rate in real time, and regulating valve 9 adjusts the valve opening according to a preset ratio to ensure that the mass ratio of sodium carbonate to lithium sulfate is 1.1~1.2:1. After the materials enter tank 11, the drive unit 2 is activated, driving the stirring rod 12 to rotate. Stirring paddle 121 rotates accordingly, and gear 143 on the stirring rod 12 rotates, driving gear 144 to rotate through meshing with the intermediate transmission wheel 142. This causes the sleeve 13 to rotate in the opposite direction to the stirring rod 12, and stirring paddle 131 rotates synchronously. The inclined blades of stirring paddle 121 and stirring paddle 131 propel the materials to flow horizontally and vertically. Because the inclination directions are the same, materials in different areas approach each other and mix thoroughly, promoting the reaction. During the reaction, steam is introduced into the jacket 7 outside tank 11, heating the internal materials through the tank wall and maintaining a suitable reaction temperature of approximately 95℃. After the steam is condensed, it is discharged from the condensate pipe. The connecting frame 141, gear one 143, gear two 144 and intermediate transmission wheel 142 are located in the isolation box 100 to avoid contact with the materials.

[0053] After the reaction is complete, the raw material transfer pump 4 starts, transporting the material in tank 11 to transfer tank 3 through pipeline. During the transport process, the transport speed can be controlled by adjusting the flow rate of the raw material transfer pump 4. After the material enters the transfer tank 3, the transfer agitator 31 rotates under the drive motor, continuously agitating the material and preventing sedimentation and stratification.

[0054] When the material in the transfer tank 3 reaches a certain amount, the transfer pump 6 starts and transports the material to the three-in-one unit 5. After the material enters the three-in-one unit 5, it first undergoes a primary pressure filtration with compressed air to squeeze out most of the mother liquor using compressed air pressure; then it undergoes a secondary pressure filtration with high-temperature pure water to wash the filter cake and remove impurities; finally, the filter cake is dried by a drying device to achieve the separation of lithium precipitation mother liquor and lithium carbonate crystals.

[0055] 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 system for reducing lithium entrainment in lithium precipitation mother liquor, characterized in that, The reactor includes a lithium precipitation reactor (1), which is used to mix sodium carbonate solution and sodium sulfate and lithium sulfate raw materials. The lithium precipitation reactor (1) includes: Tank (11), the tank (11) being used to contain the reaction raw materials; A stirring rod (12) is rotatably mounted on the top of the tank (11) at one end for connection with the rotating drive (2), and the other end extends to the bottom of the tank (11). A stirring paddle (121) is provided on the stirring rod (12). A sleeve (13) is rotatably mounted on the stirring rod (12). A transmission component (14) is provided on the sleeve (13). The transmission component (14) is located inside the tank (11). The transmission component (14) can drive the sleeve (13) to rotate with the stirring rod (12) and in the opposite direction to the rotation of the stirring rod (12). A second stirring paddle (131) is provided on the sleeve (13).

2. The system for reducing lithium entrainment in lithium precipitation mother liquor according to claim 1, characterized in that, The transmission component (14) includes: A connecting frame (141) is disposed on the inner wall of the tank body (11). An intermediate drive wheel (142) is rotatably mounted on the connecting frame (141); Gear 1 (143) is mounted on the stirring rod (12) and can rotate coaxially with the stirring rod (12). Gear 1 (143) meshes with the intermediate transmission wheel (142). Gear 2 (144) is mounted on the sleeve (13) and can drive the sleeve (13) to rotate. Gear 2 (144) is meshed with the intermediate transmission wheel (142). The intermediate transmission wheel (142), the first gear (143) and the second gear (144) are all bevel gears, and the rotation axis of the intermediate transmission wheel (142) is perpendicular to the rotation axes of the first gear (143) and the second gear (144) so ​​that the first gear (143) and the second gear (144) rotate in opposite directions.

3. The system for reducing lithium entrainment in lithium precipitation mother liquor according to claim 1, characterized in that, Also includes: Transfer tank (3), the transfer tank (3) is used to receive the material after reaction in the lithium precipitation reactor (1); The transfer mixing component (31) is rotatably disposed inside the transfer tank (3) and is used to mix the materials inside the transfer tank (3).

4. The system for reducing lithium entrainment in lithium precipitation mother liquor according to claim 3, characterized in that, Also includes: Raw material transfer pump (4) is used to transfer the material in the lithium precipitation reactor (1) to the transfer tank (3).

5. The system for reducing lithium entrainment in lithium precipitation mother liquor according to claim 3, characterized in that, Also includes: The three-in-one unit (5) is used to receive the material in the transfer tank (3). The three-in-one unit (5) can separate the lithium mother liquor from the lithium carbonate crystals after the material is subjected to one-time compressed air filtration, two-time high-temperature pure water filtration and filter cake drying. Transfer pump (6) is used to transport materials in transfer tank (3) to three-in-one unit (5).

6. The system for reducing lithium entrainment in lithium precipitation mother liquor according to claim 1, characterized in that, The lithium deposition reactor (1) is provided with a jacket (7) on the outside. The upper part of the jacket (7) is used to connect with the steam pipe and the lower part is used to connect with the condensate pipe. The jacket (7) is used to introduce steam.

7. The system for reducing lithium entrainment in lithium precipitation mother liquor according to claim 1, characterized in that, The stirring paddle (121) is provided with at least one blade (1211) along the circumference of the stirring rod (12), and the blade (1211) is inclined. The stirring paddle (131) is provided with at least one blade (1311) along the circumference of the sleeve (13), and the blade (1311) is inclined.

8. The system for reducing lithium entrainment in lithium precipitation mother liquor according to claim 7, characterized in that, The first blade (1211) and the second blade (1311) are tilted in the same direction, which enables the materials in the mixing area of ​​the first blade (121) and the mixing area of ​​the second blade (131) to be brought close to each other and fully mixed.

9. The system for reducing lithium entrainment in lithium precipitation mother liquor according to claim 1, characterized in that, The lithium deposition reactor (1) is equipped with a flow meter (8) and a regulating valve (9) at the material inlet to control the proportion of material entering the lithium deposition reactor (1).

10. A system for reducing lithium entrainment in lithium precipitation mother liquor according to claim 2, characterized in that, It also includes an isolation box (100), which is disposed inside the tank body (11). The connecting frame (141), the first gear (143), the second gear (144) and the intermediate transmission wheel (142) are all disposed inside the isolation box (100).

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