A reactor for preparing battery-grade lithium carbonate by single lithium precipitation

Abstract

The utility model discloses a reactor for preparing battery-grade lithium carbonate by one-time lithium precipitation, comprising a cylinder and a slurry crushing mechanism, wherein the slurry crushing mechanism comprises a shear pump, the feed port of the shear pump is connected to the slurry outlet, the discharge port of the shear pump is connected to the slurry inlet, the discharge port of the shear pump is also connected to the lithium carbonate outlet, and a screen is provided between the discharge port of the shear pump and the lithium carbonate outlet. The reactor of the utility model can crush lithium carbonate particles by setting the slurry crushing mechanism, not only can lithium carbonate grains with uniform particle size be obtained, but also more salt impurities can be exposed, which is beneficial to reduce the impurity content in the lithium carbonate crystals, so that the preparation of battery-grade lithium carbonate can be achieved by one-time lithium precipitation, and has the advantages of less material loss, high production efficiency, high and stable product quality, etc., which is of great significance for meeting the market demand for high-quality lithium carbonate products.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium carbonate production equipment and relates to a lithium precipitation reaction kettle for preparing battery-grade lithium carbonate, in particular to a reaction kettle for preparing battery-grade lithium carbonate by single lithium precipitation. Background Art

[0002] In recent years, with the rapid development of power lithium batteries, especially with the expansion of the application market of battery-grade lithium carbonate, the demand for lithium carbonate has increased sharply at home and abroad. In order to meet the market demand, the process of preparing battery-grade lithium carbonate based on one-time lithium precipitation has received great attention. This process is to directly convert the lithium precipitation pre-liquid (Li 2 SO 4 ) is added to a sodium carbonate solution and mixed to produce a lithium precipitation reaction to generate a crude lithium carbonate product, which is then separated into a solid and liquid state, washed, filtered, and dried to obtain a battery-grade lithium carbonate product. The key to obtaining a battery-grade lithium carbonate product is to improve the crystallization effect of lithium carbonate and reduce the impurity content in the crude lithium carbonate product.

[0003] In response to the above problems, some researchers have proposed a lithium precipitation reactor for improving the quality of lithium carbonate. The reactor uses a spiral nozzle to atomize and feed lithium sulfate liquid, which is then stirred and mixed using a stirring blade. A baffle is used to block the liquid on the outside of the cylinder to suppress the generation of vortices, thereby making the crystallization of lithium carbonate better and more uniform. Impurities such as potassium and sodium are not easily wrapped in the lithium carbonate crystal nucleus, and the resulting lithium carbonate crystals are finer and more uniform, thereby improving the quality of lithium carbonate. However, the lithium precipitation reactor still needs to be improved in the following aspects: (1) The atomization feeding through the spiral nozzle can easily cause the feed liquid to adhere to the reactor wall, which can easily cause material pollution and loss, and cannot be recovered, thereby reducing economic benefits and being unfavorable for industrial production. At the same time, the atomization spray feeding method requires an additional booster pump, which increases equipment investment and maintenance costs. The more prominent problem is that the atomization feeding method still has the defects of slow feeding rate and low production efficiency; (2) The cross-section of the baffle plate used is an isosceles right-angle fan structure, and the right-angle side of the baffle plate points to the center line of the cylinder, which has the disadvantage of small blocking area, resulting in poor effect of suppressing the generation of eddy currents, making it difficult to form lithium carbonate with uniform grains. Furthermore, due to the uneven grains, it is also difficult to remove the potassium and sodium impurity ions contained in the grains through slurry washing, and it is difficult to obtain high-quality battery-grade lithium carbonate that meets national standards, and only industrial-grade lithium carbonate can be obtained. Lithium, at the same time, lithium carbonate is likely to adhere between the baffle and the inner wall of the cylinder, which may easily cause material loss; (3) Although a sieve plate cover with through holes is provided on the discharge port at the bottom of the lithium precipitation chamber to filter larger crystals, when these crystals are deposited in large quantities at the bottom of the lithium precipitation chamber, manual cleaning and maintenance are required, which will not only reduce the production efficiency of the reactor but also increase labor costs; (4) The reaction temperature is adjusted by steam heating, which has high requirements for the quality of high-temperature steam, and steam containing corrosive impurities will affect the heating effect and even damage the reactor. At the same time, steam heating requires special heating equipment and steam generators, which significantly increases the equipment construction cost and maintenance cost, is not conducive to industrial production, and has a limited scope of application; (5) The bottom of the lithium precipitation chamber is arc-shaped, that is, a flat-bottomed reactor. During the reaction process, some crystals will accumulate in the corners of the reactor, resulting in poor reaction effect, and some finished products will accumulate at the bottom of the reactor during unloading and cannot be discharged normally. Therefore, how to overcome the above defects and obtain a reactor with less material loss, high production efficiency, high product quality and stability for preparing battery-grade lithium carbonate with one-time lithium precipitation is of great significance to meet the market demand for high-quality lithium carbonate products. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a reaction kettle for preparing battery-grade lithium carbonate by single lithium precipitation, with low material loss, high production efficiency, high product quality and stability, in view of the deficiencies in the prior art.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions.

[0006] A reaction kettle for preparing battery-grade lithium carbonate by primary lithium precipitation comprises a cylinder and a support for fixing the cylinder, wherein a feeding mechanism is connected to the cylinder, a stirring mechanism is arranged inside the cylinder, a baffle is arranged on the inner side wall of the cylinder, a slurry inlet is arranged on the top of the cylinder, a slurry outlet is arranged at the bottom of the cylinder, and also comprises a slurry crushing mechanism; the slurry crushing mechanism comprises a shear pump, a feeding port of the shear pump is connected to the slurry outlet, and a discharge port of the shear pump is connected to the slurry inlet; the discharge port of the shear pump is also connected to a lithium carbonate outlet; a screen is arranged between the discharge port of the shear pump and the lithium carbonate outlet.

[0007] As a further improvement of the above technical solution: the feeding mechanism includes a distribution pipe; the distribution pipe is located above the cylinder body; the distribution pipe is annular or polygonal and is horizontally arranged; a plurality of holes are arranged on the distribution pipe; the diameter of the holes is 2mm to 4mm; the outlet direction of the holes is vertically downward.

[0008] As a further improvement of the above technical solution: it also includes a lithium precipitation pre-liquid storage tank and a sodium carbonate solution storage tank; the lithium precipitation pre-liquid storage tank and the sodium carbonate solution storage tank are located above the cylinder; the height difference between the lithium precipitation pre-liquid storage tank and the cylinder is ≥2m; the height difference between the sodium carbonate solution storage tank and the cylinder is ≥2m.

[0009] As a further improvement of the above technical solution: the inlet of the distribution pipe is connected to the outlet of the lithium precipitation pre-liquid storage tank through a first feed pipe; the outlet of the sodium carbonate solution storage tank is connected to the cylinder through a second feed pipe.

[0010] As a further improvement of the above technical solution: the stirring mechanism includes a stirring shaft, an auxiliary stirring blade, a main stirring blade and a stirring motor; the stirring shaft is vertically arranged in the cylinder and is located at the center of the cylinder; the auxiliary stirring blade and the main stirring blade are detachably installed on the stirring shaft from bottom to top; the output end of the stirring motor is connected to the stirring shaft, and is used to drive the auxiliary stirring blade and the main stirring blade to rotate; the stirring motor is electrically connected to a control cabinet; the control cabinet is detachably installed on the support.

[0011] As a further improvement of the above technical solution: it also includes an upper head; the upper head is arranged on the top of the cylinder to seal the cylinder; the stirring motor is detachably mounted on the upper head.

[0012] As a further improvement of the above technical solution: the baffle is in the shape of a right-angled trapezoidal plate; the long right-angled side of the right-angled trapezoidal plate is connected to the cylinder, and the short right-angled side is located below the cylinder; the number of the baffles is at least three; the baffles are symmetrically arranged on the inner wall of the cylinder.

[0013] As a further improvement of the above technical solution: a plurality of inclined holes are provided on the right-angle trapezoidal plate; the openings of the inclined holes face upward.

[0014] As a further improvement of the above technical solution: a heating chamber is also provided inside the cylinder, the heating chamber is filled with heat transfer oil, an electric heating rod is provided in the heat transfer oil; the electric heating rod is electrically connected to a control cabinet; a heat transfer oil inlet and a heat transfer oil outlet are provided on the heating chamber.

[0015] As a further improvement of the above technical solution: the bottom of the cylinder is conical.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] (1) In the reactor of the utility model, the raw materials (lithium precipitation pre-liquid, sodium carbonate solution) enter the lithium precipitation chamber in the cylinder body and then undergo lithium precipitation reaction to generate lithium carbonate slurry. The slurry enters the shear pump through the slurry outlet at the bottom of the cylinder body and returns to the lithium precipitation chamber in the cylinder body through the slurry inlet. During the circulation process, the rotor and spindle in the shear pump rotate and move at a relatively high speed in the extremely narrow space of the pump body, generating strong mechanical impact force, mechanical motion force, mechanical shear force, and tangential shear force, which can crush the lithium carbonate particles, making the lithium carbonate crystals finer and more uniform, and then passing through the screen and being discharged from the lithium carbonate outlet to obtain fine lithium carbonate crystals with a particle size that meets the requirements; more importantly, through the crushing action of the shear pump, more impurity salts (such as Na + , K + 、SO 4 2- ) are exposed, that is, by reducing peritectic, it is beneficial to achieve the complete dissolution of these salts in the washing process, thereby completely removing the salt impurities in the lithium carbonate crystals, and achieving the purpose of obtaining battery-grade lithium carbonate products after one lithium precipitation and washing. Compared with the conventional lithium precipitation reactor, in the reactor of the utility model, by setting a slurry crushing mechanism, the lithium carbonate particles can be crushed, not only lithium carbonate grains with uniform particle size can be obtained, but also more salt impurities can be exposed, which is beneficial to reduce the impurity content in the lithium carbonate crystals, so that the preparation of battery-grade lithium carbonate can be achieved through one lithium precipitation, which is of great significance for meeting the market demand for high-quality lithium carbonate products.

[0018] (2) In the reactor of the utility model, by arranging a distribution pipe above the cylinder, the lithium precipitate pre-liquid can be directly added to the lithium precipitate cavity in the cylinder through the holes arranged on the distribution pipe, which can not only improve the feeding efficiency and reaction rate, but also effectively overcome the problem of liquid sticking to the wall, reduce the amount of liquid sticking to the inner wall of the cylinder, significantly reduce the loss of materials, and thus improve the utilization rate of materials and improve economic benefits. In particular, a lithium precipitate pre-liquid storage tank is arranged above the distribution pipe, and the lithium precipitate pre-liquid stored in the lithium precipitate pre-liquid storage tank is transported to the distribution pipe through the feeding pipe, thereby the holes on the distribution pipe and the gravity can be used to make the lithium precipitate pre-liquid drip into the lithium precipitate cavity in the cylinder in the form of water drops, thereby better improving the feeding efficiency and completely solving the problem of liquid sticking to the wall, and thus significantly improving the preparation efficiency of lithium precipitate once. The reactor of the utility model does not require pump pressurization, reduces equipment investment, saves investment, and is convenient for industrial application.

[0019] (3) In the reactor of the utility model, the baffle plate used is a right-angle trapezoidal plate, which has a larger baffle area, and thus has a better baffle effect on the material in the cylinder. More importantly, a number of inclined holes are opened on the baffle plate, so that better liquid flow can be achieved during operation, the stirring effect of the material is increased, which is beneficial to improve the reaction rate and thus generate lithium carbonate crystals more quickly. At the same time, by setting the inclined holes, the adhesion of the product lithium carbonate to the baffle plate can also be reduced, which is beneficial to reduce material loss.

[0020] (4) In the reactor of the utility model, heat transfer oil heating is used to maintain the reaction temperature in the cylinder. The heating speed is faster and more stable, the damage to the reactor is small, and it is beneficial to improve the life of the equipment. In particular, the heat transfer effect of the heat transfer oil is good, which is more conducive to maintaining the stability of the reaction temperature in the cylinder and has a wider range of applications.

[0021] (5) In the reactor of the utility model, the bottom of the cylinder is conical, and the conical cylinder can effectively reduce the accumulation of generated lithium carbonate crystals in the corners of the reactor, making the generated lithium carbonate finer and facilitating the unloading of finished lithium carbonate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0023] Figure 1 It is a schematic diagram of the structure of the reaction kettle in the embodiment of the utility model.

[0024] Figure 2 It is a schematic diagram of the structure of the shear pump in the embodiment of the utility model.

[0025] Figure 3It is a structural schematic diagram of the feeding mechanism in the embodiment of the utility model.

[0026] Figure 4 It is a structural schematic diagram of the baffle in the embodiment of the utility model.

[0027] Legend:

[0028] 1. Storage tank for lithium precipitation pre-liquid; 2. Storage tank for sodium carbonate solution; 3. Support; 4. Cylinder; 5. Distribution pipe; 6. Shear pump; 61. Rotor; 62. Ingot; 7. First feed pipe; 8. Baffle; 9. Stirring shaft; 10. Auxiliary stirring blade; 11. Main stirring blade; 12. Upper head; 13. Second feed pipe; 14. Stirring motor; 15. Lithium carbonate outlet; 16. Slurry inlet; 17. Slurry outlet; 18. Heat transfer oil inlet; 19. Electric heating rod; 20. Control cabinet; 21. Heat transfer oil outlet; 22. Screen. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0030] The materials and instruments used in the following examples are all commercially available.

[0031] Example:

[0032] like Figure 1 and Figure 2As shown, the reactor of this embodiment for preparing battery-grade lithium carbonate by single lithium precipitation includes a cylinder 4 and a support 3 for fixing the cylinder 4, a feeding mechanism is connected to the cylinder 4, a stirring mechanism is arranged inside the cylinder 4, a baffle 8 is arranged on the inner wall of the cylinder 4, a slurry inlet 16 is arranged on the top of the cylinder 4, a slurry outlet 17 is arranged at the bottom of the cylinder 4, and also includes a slurry crushing mechanism; the slurry crushing mechanism includes a shear pump 6, the feeding port of the shear pump 6 is connected to the slurry outlet 17, and the discharge port of the shear pump 6 is connected to the slurry inlet 16; the discharge port of the shear pump 6 is also connected to the lithium carbonate outlet 15; a screen 22 is arranged between the discharge port of the shear pump 6 and the lithium carbonate outlet 15, and the aperture of the screen 22 is adjusted according to actual production needs. In this embodiment, after the raw materials (lithium precipitation pre-liquid, sodium carbonate solution) enter the lithium precipitation chamber in the cylinder, a lithium precipitation reaction occurs to generate lithium carbonate slurry. These slurries enter the shear pump through the slurry outlet at the bottom of the cylinder and return to the lithium precipitation chamber in the cylinder through the slurry inlet. During the circulation process, the rotor 61 and the spindle 62 in the shear pump rotate and move at a relatively high speed in the extremely narrow space of the pump body, generating a strong mechanical impact force, mechanical motion force, mechanical shear force, and tangential shear force, which can crush the lithium carbonate particles, making the lithium carbonate crystals finer and more uniform, and then pass through the screen and discharge through the lithium carbonate outlet to obtain fine lithium carbonate crystals with a particle size that meets the requirements, and enter the subsequent washing process; more importantly, through the crushing action of the shear pump, more impurity salts (such as Na + , K + 、SO 4 2- ) is exposed, that is, by reducing the peritectic, it is beneficial to achieve the complete dissolution of these salts in the washing process, thereby completely removing the salt impurities in the lithium carbonate crystals, and achieving the purpose of obtaining battery-grade lithium carbonate products after one lithium precipitation and washing.

[0033] like Figure 1 and Figure 3 As shown, in this embodiment, the feeding mechanism includes a distribution pipe 5; the distribution pipe 5 is located above the cylinder 4; the distribution pipe 5 is annular or polygonal, specifically a regular hexagon, and is arranged horizontally; a number of holes are arranged on the distribution pipe 5; the diameter of the hole is 2mm, and the diameter of the hole can be adjusted according to the flow rate required for actual production; the outlet direction of the hole is vertically downward. In this embodiment, by arranging a distribution pipe for feeding above the cylinder, the regular hexagonal distribution pipe can be used to increase the feeding surface, and there are evenly distributed holes with a diameter of 2mm on the distribution pipe, and the holes are used for uniform drip feeding, so that the material liquid is mixed more evenly and the reaction rate is improved.

[0034] like Figure 1As shown, in this embodiment, a lithium pre-liquid storage tank 1 and a sodium carbonate solution storage tank 2 are also included; the lithium pre-liquid storage tank 1 and the sodium carbonate solution storage tank 2 are located above the cylinder 4; the height difference between the lithium pre-liquid storage tank 1 and the cylinder 4 is 2m; the height difference between the sodium carbonate solution storage tank 2 and the cylinder 4 is 2m. In this embodiment, the lithium pre-liquid storage tank and the sodium carbonate solution storage tank are located above the cylinder, and the height difference is used to realize the feeding by the gravity of the solution itself, and there is no need to set a booster pump, which can reduce energy consumption and save costs.

[0035] like Figure 1 and Figure 3 As shown, the inlet of the distribution pipe 5 is connected to the outlet of the lithium precipitation pre-liquid storage tank 1 through the first feeding pipe 7; the outlet of the sodium carbonate solution storage tank 2 is connected to the cylinder 4 through the second feeding pipe 13.

[0036] like Figure 1 As shown, in this embodiment, the stirring mechanism includes a stirring shaft 9, an auxiliary stirring blade 10, a main stirring blade 11 and a stirring motor 14; the stirring shaft 9 is vertically arranged in the cylinder 4, located at the center of the cylinder 4; the auxiliary stirring blade 10 and the main stirring blade 11 are detachably mounted on the stirring shaft 9 from bottom to top; the output end of the stirring motor 14 is connected to the stirring shaft 9, and is used to drive the auxiliary stirring blade 10 and the main stirring blade 11 to rotate; the stirring motor 14 is electrically connected to the control cabinet 20; the control cabinet 20 is detachably mounted on the support 3. In this embodiment, the stirring blades include main stirring blades and auxiliary stirring blades, which are distributed on the stirring shaft from bottom to top. The main stirring blades are combined with the auxiliary stirring blades to stir, so that the stock solution is mixed more fully and evenly. At the same time, the control cabinet can accurately control the rotation speed of the stirring shaft, so as to obtain the best reaction stirring rate, make the stirring more uniform, and improve the quality of lithium carbonate.

[0037] like Figure 1 As shown, in this embodiment, an upper head 12 is further included; the upper head 12 is arranged on the top of the cylinder 4 and is used to seal the cylinder 4; the stirring motor 14 is detachably mounted on the upper head 12. In this embodiment, the cylinder is sealed with the upper head to form a lithium sinking cavity, which can prevent the material from splashing outward during the stirring process, which is beneficial to reducing the loss of the material.

[0038] like Figure 1 and Figure 4 As shown, in this embodiment, the baffle plate 8 is in the shape of a right-angled trapezoidal plate, the long right-angled side of the right-angled trapezoidal plate is connected to the cylinder 4, and the short right-angled side is located below the cylinder 4; there are three baffle plates 8; the baffle plates 8 are symmetrically arranged on the inner wall of the cylinder 4. At the same time, a number of inclined holes are opened on each right-angled trapezoidal plate, for example, there are 3 inclined holes, which are sequentially distributed on the plate surface of the right-angled trapezoidal plate, and the openings of these inclined holes face upward. In this embodiment, the right-angled trapezoidal plate is used as a baffle, which can effectively suppress eddy currents, will not produce large dead angles, and will not produce large crystals encapsulating Na+ , K + 、SO 4 2- The three baffles have evenly distributed oblique holes, which can effectively reduce the adhesion of lithium carbonate to the baffles and reduce the wall sticking phenomenon.

[0039] In this embodiment, a heating chamber is further provided inside the cylinder 4, and the heating chamber is filled with heat transfer oil, and two electric heating rods 19 are provided in the heat transfer oil; the electric heating rods 19 are electrically connected to a control cabinet 20; and the heating chamber is provided with a heat transfer oil inlet 18 and a heat transfer oil outlet 21. In this embodiment, by using the control cabinet to control the heating rate of the electric heating rods, the temperature of the optimal lithium precipitation reaction can be accurately controlled, the reaction rate can be accelerated, and the lithium carbonate can be better crystallized.

[0040] In this embodiment, the bottom of the cylinder 4 is conical, and the conical cylinder can effectively reduce the accumulation of generated lithium carbonate crystals in the corners of the kettle, making the generated lithium carbonate finer and facilitating the unloading of finished lithium carbonate.

[0041] Compared with conventional lithium precipitation reactors, the reactor of the utility model can realize the pulverization of lithium carbonate particles by setting a slurry crushing mechanism, which can not only obtain lithium carbonate grains with uniform particle size, but also expose more salt impurities, which is beneficial to reduce the impurity content in the lithium carbonate crystals. Therefore, battery-grade lithium carbonate can be prepared through one-time lithium precipitation, which has the advantages of less material loss, high production efficiency, high and stable product quality, etc., which is of great significance for meeting the market demand for high-quality lithium carbonate products.

[0042] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above in the preferred embodiment, it is not used to limit the utility model. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the methods and technical contents disclosed above without departing from the spirit and technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model, still fall within the scope of protection of the technical solution of the utility model.

Claims

1. A reactor for preparing battery-grade lithium carbonate by primary lithium precipitation, comprising a cylinder (4) and a support (3) for fixing the cylinder (4), wherein a feeding mechanism is connected to the cylinder (4), a stirring mechanism is arranged inside the cylinder (4), a baffle (8) is arranged on the inner side wall of the cylinder (4), a slurry inlet (16) is arranged on the top of the cylinder (4), and a slurry outlet (17) is arranged at the bottom of the cylinder (4), characterized in that: It also includes a slurry crushing mechanism; the slurry crushing mechanism includes a shear pump (6), the feed port of the shear pump (6) is connected to the slurry outlet (17), and the discharge port of the shear pump (6) is connected to the slurry inlet (16); the discharge port of the shear pump (6) is also connected to the lithium carbonate outlet (15); a screen (22) is provided between the discharge port of the shear pump (6) and the lithium carbonate outlet (15).

2. The reactor for preparing battery-grade lithium carbonate by single lithium precipitation according to claim 1, characterized in that: The feeding mechanism comprises a distribution pipe (5); the distribution pipe (5) is located at the upper part of the cylinder (4); the distribution pipe (5) is annular or polygonal and is arranged horizontally; a plurality of holes are arranged on the distribution pipe (5); the diameter of the holes is 2 mm to 4 mm; the outlet direction of the holes is vertically downward.

3. The reactor for preparing battery-grade lithium carbonate by single lithium precipitation according to claim 2, characterized in that: It also comprises a lithium precipitation pre-liquid storage tank (1) and a sodium carbonate solution storage tank (2); the lithium precipitation pre-liquid storage tank (1) and the sodium carbonate solution storage tank (2) are located above the cylinder (4); the height difference between the lithium precipitation pre-liquid storage tank (1) and the cylinder (4) is ≥2m; the height difference between the sodium carbonate solution storage tank (2) and the cylinder (4) is ≥2m; The inlet of the material distribution pipe (5) is connected to the outlet of the lithium precipitation pre-liquid storage tank (1) through a first material feeding pipe (7); The outlet of the sodium carbonate solution storage tank (2) is connected to the cylinder (4) via a second feed pipe (13).

4. The reactor for preparing battery-grade lithium carbonate by primary lithium precipitation according to any one of claims 1 to 3, characterized in that: The stirring mechanism comprises a stirring shaft (9), an auxiliary stirring blade (10), a main stirring blade (11) and a stirring motor (14); the stirring shaft (9) is vertically arranged in the cylinder (4) and is located at the center of the cylinder (4); the auxiliary stirring blade (10) and the main stirring blade (11) are detachably mounted on the stirring shaft (9) from bottom to top; the output end of the stirring motor (14) is connected to the stirring shaft (9); the stirring motor (14) is electrically connected to a control cabinet (20); and the control cabinet (20) is detachably mounted on the support (3).

5. The reactor for preparing battery-grade lithium carbonate by single lithium precipitation according to claim 4, characterized in that: It also comprises an upper sealing head (12); the upper sealing head (12) is arranged on the top of the cylinder (4); and the stirring motor (14) is detachably mounted on the upper sealing head (12).

6. The reactor for preparing battery-grade lithium carbonate by primary lithium precipitation according to any one of claims 1 to 3, characterized in that: The baffle plate (8) is in the shape of a right-angled trapezoidal plate; the long right-angled side of the right-angled trapezoidal plate is connected to the cylinder (4), and the short right-angled side is located below the cylinder (4); the number of the baffle plates (8) is at least three; and the baffle plates (8) are symmetrically arranged on the inner side wall of the cylinder (4).

7. The reactor for preparing battery-grade lithium carbonate by primary lithium precipitation according to claim 6, characterized in that: The right-angle trapezoidal plate is provided with a plurality of inclined holes, and the openings of the inclined holes face upward.

8. The reactor for preparing battery-grade lithium carbonate by primary lithium precipitation according to any one of claims 1 to 3, characterized in that: A heating chamber is also provided inside the cylinder (4), the heating chamber is filled with heat transfer oil, an electric heating rod (19) is provided in the heat transfer oil; the electric heating rod (19) is electrically connected to a control cabinet (20); and a heat transfer oil inlet (18) and a heat transfer oil outlet (21) are provided on the heating chamber.

9. The reactor for preparing battery-grade lithium carbonate by primary lithium precipitation according to any one of claims 1 to 3, characterized in that: The bottom of the cylinder (4) is conical.

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