A device for preparing battery-grade lithium carbonate based on mother liquor water concentrate and a process thereof

Abstract

The application discloses a device and process for preparing battery-grade lithium carbonate based on mother liquor water concentrate, and belongs to the field of lithium carbonate preparation. The device and process for preparing battery-grade lithium carbonate based on mother liquor water concentrate comprises a preparation bin, a material distributor input port is arranged on the top of the preparation bin, a stirring rod driven by a servo motor is arranged in the preparation bin, and a discharge port is arranged on the side of the preparation bin. The device and process for preparing battery-grade lithium carbonate based on mother liquor water concentrate input sodium hydroxide solution into the material distributor input port, and the stirring rod driven by the servo motor is started, and the chain wheel one, chain, rotating rod one, chain wheel two, gear one, material distributor body, pipe joint, gear two, nozzle and bidirectional gear ring are matched, so that the sodium hydroxide solution is rotated and sprayed, the coverage range is improved, and each position on the surface of the liquid at the bottom is covered, and the reaction efficiency of the device is improved.

Description

Technical Field

[0001] This invention belongs to the field of lithium carbonate preparation, specifically relating to an apparatus and process for preparing battery-grade lithium carbonate based on a mother liquor concentrate. Background Technology

[0002] In the field of lithium resource extraction and battery material preparation, mother liquor concentrate is usually derived from the evaporation and concentration process of brine from salt lakes or lithium ore leachate, and it is a key raw material for the preparation of battery-grade lithium carbonate. Currently, the commonly used industrial preparation process mainly includes three core steps: pretreatment, carbonation reaction, and post-treatment.

[0003] Chinese patent CN121292481A, published on January 9, 2026, discloses a process and apparatus for preparing battery-grade lithium carbonate based on mother liquor concentrate. The apparatus includes: a lithium precipitation tank, with a feeder at the top of the tank. The feeder has a ring structure and is used to spray purification liquid into the lithium precipitation tank. A purification liquid valve is provided through the top side of the lithium precipitation tank.

[0004] The aforementioned application describes a preparation process where sodium hydroxide solution is sprayed into lithium precipitate using a ring-shaped feeder. However, when the sodium hydroxide solution is sprayed, the nozzles on the feeder are relatively stationary, making it difficult to directly cover all areas of the bottom liquid surface, thus affecting the reaction efficiency of the device. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an apparatus and process for preparing battery-grade lithium carbonate based on mother liquor concentrate, solving the problems mentioned in the background section. To achieve the above objectives, this invention is implemented through the following technical solution: An apparatus and process for preparing battery-grade lithium carbonate based on mother liquor concentrate, comprising a preparation chamber, a feeder inlet mounted on the top of the preparation chamber, a stirring rod driven by a servo motor mounted inside the preparation chamber, and a discharge outlet mounted on the side of the preparation chamber; A sprocket is fixedly connected to the outside of the stirring rod. The inside of the feeder inlet is equipped with the feeder body. A pipe joint is rotatably connected to the bottom of the feeder body. A transmission component for transmission is assembled between the sprocket and the pipe joint. A nozzle is assembled at the bottom of the pipe joint. A mixing component is assembled inside the preparation chamber. An auxiliary stirring component is assembled inside the preparation chamber.

[0006] Preferably, the transmission component includes a chain mounted on the outside of a sprocket, a through-type rotating rod rotatably connected inside the preparation chamber, a sprocket and a gear fixedly connected to the outside of the rotating rod, a bidirectional gear ring rotatably connected inside the preparation chamber, the bidirectional gear ring meshing with the gear one, and a gear two fixedly connected to the outside of the pipe joint, the gear two meshing with the bidirectional gear ring. This device configuration allows the sodium hydroxide solution to be sprayed out in a rotating manner, increasing its coverage area and thus covering all positions on the bottom liquid surface, thereby improving the reaction efficiency of the device.

[0007] Preferably, the end of the chain furthest from the first sprocket is fitted to the outer side of the second sprocket.

[0008] Preferably, there are six nozzles in total, and the six nozzles are arranged in a circumferential array about the main body of the fabric distributor.

[0009] Preferably, the mixing assembly includes an eccentric wheel fixed to the outside of the rotating rod, a through hydraulic chamber I is installed inside the preparation chamber, a force-bearing rod I is slidably connected to the side of the hydraulic chamber I via a piston, a spring I is installed on the side of the force-bearing rod I, a hydraulic chamber II is installed inside the stirring rod, a shaped rod is slidably connected to the side of the hydraulic chamber II via a piston, and a mixing plate is rotatably connected to the side of the stirring rod via a rotating block I. By configuring the mixing assembly, the revolving mixing plate simultaneously performs a reciprocating oscillation at a certain angle, improving the mixing effect of the device on the internal solution, thereby increasing the reaction efficiency of the device.

[0010] Preferably, the force-bearing rod is located on the side of the eccentric wheel and is in contact with the eccentric wheel.

[0011] Preferably, the second hydraulic chamber is rotatably connected to the first hydraulic chamber, and is rotatably connected to the first hydraulic chamber.

[0012] Preferably, the mixing plate is located on the side of the irregular rod and is fixed to the irregular rod.

[0013] Preferably, the auxiliary stirring component includes a square opening on the mixing plate, a rotating block two is rotatably connected inside the square opening, a rotating shaft is fixedly connected to the side of the rotating block two, a tilting plate is fixedly connected to the outside of the rotating shaft, and a placement groove is formed inside the tilting plate, with a gravity column installed inside the placement groove. By configuring the auxiliary stirring component, a variable angle is formed between the tilting plate and the mixing plate, allowing the stirred portion of the solution to be diverted through this angle, further improving the mixing effect of the device.

[0014] A process for preparing battery-grade lithium carbonate based on a mother liquor concentrate includes the following steps: Step 1: Place the concentrated mother liquor into the preparation chamber, inject sodium hydroxide solution using the main body of the distributor, adjust the pH to 10-12, and perform pretreatment operations such as stirring to remove magnesium and calcium ions. Step 2: The pretreated concentrate is subjected to a carbonation reaction to generate lithium carbonate precipitate; Step 3: Wash and dry the lithium carbonate precipitate multiple times to obtain battery-grade lithium carbonate with a purity of not less than 99.5%.

[0015] The advantages of this application are: (1) The apparatus and process for preparing battery-grade lithium carbonate based on mother liquor concentrate, sodium hydroxide solution is introduced into the feeder inlet, and the stirring rod driven by the servo motor is activated. In conjunction with sprocket one, chain, rotating rod one, sprocket two, gear one, feeder body, pipe joint, gear two, nozzle and bidirectional gear ring, the sodium hydroxide solution can be rotated and sprayed out, increasing its coverage range, thereby covering various positions on the bottom liquid surface and improving the reaction efficiency of the apparatus.

[0016] (2) The apparatus and process for preparing battery-grade lithium carbonate based on mother liquor concentrate, when the rotating rod one rotates, it can drive the eccentric wheel to rotate. In conjunction with hydraulic chamber one, force rod one, spring one, hydraulic chamber two, irregular rod and rotating block one, the mixing plate that is revolving will simultaneously swing back and forth at a certain angle, which improves the mixing effect of the device on the internal solution, thereby improving the reaction efficiency of the device.

[0017] (3) The apparatus and process for preparing battery-grade lithium carbonate based on mother liquor concentrate, when the mixing plate swings back and forth at a certain angle, the square opening inside it rotates synchronously. Together with the rotating block 2, the rotating shaft, the placement groove and the gravity column, a variable angle is formed between the flipping plate and the mixing plate. The part of the solution that is stirred can be diverted through this angle, which further improves the mixing effect of the apparatus. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the overall appearance of the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional three-dimensional structure of the present invention; Figure 3 This is a three-dimensional structural diagram of some parts of the present invention; Figure 4 This is a three-dimensional structural diagram of some parts of the present invention; Figure 5 This is a three-dimensional structural diagram of the hybrid component of the present invention; Figure 6 This is a three-dimensional structural diagram of some parts of the hybrid component of the present invention; Figure 7 This is a three-dimensional structural diagram of the auxiliary stirring component of the present invention; Figure 8 This is a three-dimensional structural diagram of some parts of the auxiliary stirring component of the present invention.

[0019] Explanation of key figure labels: 100. Preparation chamber; 200. Feeder inlet; 300. Stirring rod; 400. Discharge outlet; 501. Sprocket 1; 502. Chain; 503. Rotating rod 1; 504. Sprocket 2; 505. Gear 1; 506. Feeder body; 507. Pipe joint; 508. Gear 2; 509. Nozzle; 510. Bidirectional gear ring; 600. Mixing component; 601. Eccentric wheel; 602. Hydraulic chamber one; 603. Force rod one; 604. Spring one; 605. Hydraulic chamber two; 606. Irregular rod; 607. Rotating block one; 608. Mixing plate; 700. Auxiliary stirring component; 701. Square opening; 702. Rotating block two; 703. Rotating shaft; 704. Flipping plate; 705. Placement slot; 706. Gravity column. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort should fall within the scope of protection of the present application.

[0021] Example 1, please refer to Figures 1-4 An apparatus and process for preparing battery-grade lithium carbonate based on mother liquor concentrate includes a preparation chamber 100, a feeder inlet 200 is installed on the top of the preparation chamber 100, a stirring rod 300 driven by a servo motor is installed inside the preparation chamber 100, and an outlet 400 is installed on the side of the preparation chamber 100. A sprocket 501 is fixedly connected to the outer side of the stirring rod 300. When sodium hydroxide solution is introduced into the feeder inlet 200, the stirring rod 300, driven by a servo motor, is activated. The rotating stirring rod 300 then drives the sprocket 501 fixedly connected to it to rotate.

[0022] The feeder body 506 is assembled inside the feeder inlet 200. A pipe joint 507 is rotatably connected to the bottom of the feeder body 506. A transmission component for transmission is assembled between the sprocket 501 and the pipe joint 507. The transmission component includes a chain 502 assembled on the outside of the sprocket 501. A through rotating rod 503 is rotatably connected inside the preparation chamber 100. A sprocket 504 and a gear 505 are fixedly connected to the outside of the rotating rod 503. The end of the chain 502 away from the sprocket 501 is assembled on the outside of the sprocket 504. When the sprocket 501 rotates, it cooperates with the chain 502 assembled on the outside of the sprocket 501, causing the sprocket 504, which is transmitted through the chain 502 to the sprocket 501, to rotate. The rotating sprocket 504 can then drive the rotating rod 503, which is fixedly connected to it, to rotate.

[0023] The preparation chamber 100 is internally connected to a bidirectional gear ring 510, which meshes with a first gear 505. A second gear 508 is fixedly connected to the outside of the pipe connector 507, and meshes with the bidirectional gear ring 510. When the rotating rod 503 rotates, it drives the fixedly connected gear 505 to rotate. The rotating gear 505 then drives the meshing bidirectional gear ring 510 to rotate, which in turn drives the meshing gear 508 to rotate.

[0024] Six nozzles 509 are mounted on the bottom of the pipe connector 507, arranged in a circumferential array around the main body 506 of the distributor. When the gear 2 508 rotates, it drives the pipe connector 507, which is fixedly connected to it, to rotate. This causes the nozzles 509 mounted on its bottom to rotate. The sodium hydroxide solution introduced into the distributor inlet 200 is then sprayed out through the distributor body 506, the pipe connector 507, and the nozzles 509. This increases the coverage area of ​​the sodium hydroxide solution, thereby covering all areas of the liquid surface at the bottom and improving the reaction efficiency of the device.

[0025] In use, sodium hydroxide solution is introduced into the feed inlet 200 of the fabric feeder. The stirring rod 300, driven by a servo motor, is activated. The rotating stirring rod 300 drives the sprocket 501, which is fixedly connected to it, to rotate. This, in conjunction with the chain 502 mounted on the outside of the sprocket 501, causes the sprocket 504, which is connected to the sprocket 501 via the chain 502, to rotate. The rotating sprocket 504 then drives the rotating rod 503, which is fixedly connected to it, to rotate. This causes the rotating rod 503 to drive the gear fixedly connected to it. When gear 505 rotates, the rotating gear 505 drives the bidirectional gear ring 510 that meshes with it to rotate, which in turn drives the bidirectional gear ring 510 to drive the gear 508 that meshes with it to rotate. The rotating gear 508 then drives the pipe joint 507 that is fixedly connected to it to rotate, which in turn drives the nozzle 509 mounted at its bottom to rotate. The sodium hydroxide solution that is introduced into the feeder inlet 200 can then be sprayed out through the feeder body 506, the pipe joint 507, and the nozzle 509.

[0026] Example 2, please refer to Figures 1-6 Based on Example 1, the preparation chamber 100 is equipped with a mixing component 600, which includes an eccentric wheel 601 fixed to the outside of the rotating rod 503. When the rotating rod 503 rotates, it drives the eccentric wheel 601 fixedly connected to it to rotate.

[0027] The preparation chamber 100 is internally equipped with a through hydraulic chamber 602. A force-bearing rod 603 is slidably connected to the side of the hydraulic chamber 602 via a piston. The force-bearing rod 603 is located on the side of the eccentric wheel 601 and is in contact with the eccentric wheel 601. When the protruding part of the eccentric wheel 601 rotates to the side position of the force-bearing rod 603, it can compress the force-bearing rod 603, and the compressed force-bearing rod 603 can move to the side.

[0028] A spring 604 is mounted on the side of the force-bearing rod 603, and a hydraulic chamber 605 is mounted inside the stirring rod 300. The hydraulic chamber 605 is rotatably connected to and rotatably connected to the hydraulic chamber 602. When the force-bearing rod 603 moves to the side, it cooperates with the hydraulic chamber 602, which is slidably connected to the force-bearing rod 603 via a piston. As the force-bearing rod 603 moves into the hydraulic chamber 602, it compresses the oil originally stored in the hydraulic chamber 602. The oil, under compression, flows into the hydraulic chamber 605, which is connected to it.

[0029] A shaped rod 606 is slidably connected to the side of the hydraulic chamber 605 via a piston. When oil flows into the hydraulic chamber 605, the oil in the hydraulic chamber 605 flows towards the side closer to the shaped rod 606, causing the shaped rod 606, which is slidably connected to the hydraulic chamber 605 via the piston, to extend out of the hydraulic chamber 605.

[0030] A mixing plate 608 is rotatably connected to the side of the stirring rod 300 via a rotating block 607. The mixing plate 608 is located on the side of the shaped rod 606 and is fixed to it. When the eccentric wheel 601 continues to rotate, and its protruding part moves away from the force-bearing rod 603, the force-bearing rod 603 loses its restraint and can be reset under the action of the spring 604. Similarly, the shaped rod 606 can retract into the hydraulic chamber 605. The shaped rod 606, in a reciprocating motion, can drive the mixing plate 608 to reciprocate at a certain angle. As the stirring rod 300 revolves, the mixing plate 608 simultaneously reciprocates at a certain angle, improving the mixing effect of the internal solution and thus increasing the reaction efficiency of the device.

[0031] In use, based on Embodiment 1, when the rotating rod 503 rotates, it drives the eccentric wheel 601 fixedly connected to it to rotate. When the protruding part of the eccentric wheel 601 rotates to the side position of the force-bearing rod 603, it can squeeze the force-bearing rod 603. The squeezed force-bearing rod 603 can move to the side. In conjunction with the hydraulic chamber 602 which is slidably connected to the force-bearing rod 603 by a piston, the force-bearing rod 603, as it moves into the hydraulic chamber 602, squeezes the oil originally stored in the hydraulic chamber 602. The oil, under pressure, can flow into the hydraulic chamber 605 connected to it, so that the hydraulic chamber... The oil in hydraulic chamber 605 flows towards the side closer to the shaped rod 606, causing the shaped rod 606, which is connected to hydraulic chamber 605 by a piston, to extend out of hydraulic chamber 605. As the eccentric wheel 601 continues to rotate, when its protruding part moves away from the force rod 603, the force rod 603 loses its restraint and can be reset under the action of spring 604. Similarly, the shaped rod 606 can retract into hydraulic chamber 605. The shaped rod 606, which is in a reciprocating state, can drive the mixing plate 608 to reciprocate at a certain angle. The mixing plate 608, which revolves with the stirring rod 300, also reciprocates at a certain angle.

[0032] Example 3, please refer to Figures 1-8Based on Embodiments 1 and 2, the preparation chamber 100 is equipped with an auxiliary stirring component 700, which includes a square opening 701 on the mixing plate 608. When the mixing plate 608 oscillates at a certain angle, the square opening 701 inside it rotates synchronously.

[0033] A rotating block 702 is rotatably connected inside the square opening 701. A rotating shaft 703 is fixedly connected to the side of the rotating block 702. A flipping plate 704 is fixedly connected to the outside of the rotating shaft 703. A placement groove 705 is opened inside the flipping plate 704, and a gravity column 706 is installed inside the placement groove 705. When the square opening 701 rotates synchronously, because the gravity column 706 is installed inside the placement groove 705, the rotating shaft 703 and the flipping plate 704 are restricted to their initial state during the reciprocating swing of the mixing plate 608 and the square opening 701. This allows the mixing plate 608 to form a variable angle between the flipping plate 704 and the mixing plate 608 during its revolution. The stirred part of the solution can be diverted through this angle, further improving the mixing effect of the device.

[0034] In use, based on Embodiment 1 and Embodiment 2, when the mixing plate 608 reciprocates at a certain angle, the square opening 701 inside it rotates synchronously. Because the placement groove 705 is equipped with a gravity column 706, the rotating shaft 703 and the flipping plate 704 are restricted to their initial state during the reciprocating swing of the mixing plate 608 and the square opening 701. This allows the flipping plate 704 and the mixing plate 608 to form a variable angle during the revolution of the mixing plate 608, through which the stirred part of the solution can be diverted.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An apparatus for preparing battery-grade lithium carbonate based on mother liquor concentrate, comprising a preparation chamber, characterized in that, The top of the preparation chamber is equipped with a fabric feeder inlet, the interior of the preparation chamber is equipped with a stirring rod driven by a servo motor, and the side of the preparation chamber is equipped with a discharge outlet. A sprocket is fixedly connected to the outside of the stirring rod. The inside of the feeder inlet is equipped with the feeder body. A pipe joint is rotatably connected to the bottom of the feeder body. A transmission component for transmission is assembled between the sprocket and the pipe joint. A nozzle is assembled at the bottom of the pipe joint. A mixing component is assembled inside the preparation chamber. An auxiliary stirring component is assembled inside the preparation chamber.

2. The apparatus for preparing battery-grade lithium carbonate based on mother liquor concentrate according to claim 1, characterized in that, The transmission component includes a chain mounted on the outside of a sprocket, a through rotating rod rotatably connected inside the preparation chamber, a sprocket 2 and a gear 1 fixedly connected to the outside of the rotating rod 1, a bidirectional gear ring rotatably connected inside the preparation chamber, the bidirectional gear ring meshing with the gear 1, and a gear 2 fixedly connected to the outside of the pipe joint, the gear 2 meshing with the bidirectional gear ring.

3. The apparatus for preparing battery-grade lithium carbonate based on mother liquor concentrate according to claim 2, characterized in that, The end of the chain furthest from the first sprocket is fitted onto the outer side of the second sprocket.

4. The apparatus for preparing battery-grade lithium carbonate based on mother liquor concentrate according to claim 2, characterized in that, There are a total of six nozzles, and the six nozzles are arranged in a circumferential array about the main body of the fabric distributor.

5. The apparatus for preparing battery-grade lithium carbonate based on mother liquor concentrate according to claim 2, characterized in that, The mixing assembly includes an eccentric wheel fixed to the outside of the rotating rod. The preparation chamber is equipped with a through hydraulic chamber. A force-bearing rod is slidably connected to the side of the hydraulic chamber via a piston. A spring is mounted on the side of the force-bearing rod. The stirring rod is equipped with a hydraulic chamber. A shaped rod is slidably connected to the side of the hydraulic chamber via a piston. A mixing plate is rotatably connected to the side of the stirring rod via a rotating block.

6. The apparatus for preparing battery-grade lithium carbonate based on mother liquor concentrate according to claim 5, characterized in that, The force-bearing rod is located on the side of the eccentric wheel and is in contact with the eccentric wheel.

7. The apparatus for preparing battery-grade lithium carbonate based on mother liquor concentrate according to claim 5, characterized in that, The second hydraulic chamber is rotatably connected to the first hydraulic chamber, and is rotatably connected to the first hydraulic chamber.

8. The apparatus for preparing battery-grade lithium carbonate based on mother liquor concentrate according to claim 5, characterized in that, The mixing plate is located on the side of the irregular rod and is fixed to the irregular rod.

9. The apparatus for preparing battery-grade lithium carbonate based on mother liquor concentrate according to claim 5, characterized in that, The auxiliary stirring component includes a square opening on the mixing plate, a rotating block two is rotatably connected inside the square opening, a rotating shaft is fixedly connected to the side of the rotating block two, a flipping plate is fixedly connected to the outside of the rotating shaft, a placement groove is opened inside the flipping plate, and a gravity column is assembled inside the placement groove.

10. The preparation process of the apparatus for preparing battery-grade lithium carbonate based on mother liquor concentrate according to any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: Place the concentrated mother liquor into the preparation chamber, inject sodium hydroxide solution using the main body of the distributor, adjust the pH to 10-12, and perform pretreatment operations such as stirring to remove magnesium and calcium ions. Step 2: The pretreated concentrate is subjected to a carbonation reaction to generate lithium carbonate precipitate; Step 3: Wash and dry the lithium carbonate precipitate multiple times to obtain battery-grade lithium carbonate with a purity of not less than 99.5%.

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