A forced external circulation lithium precipitation device

Abstract

The utility model provides a kind of forced external circulation's lithium precipitation device, lithium carbonate production device, comprising: lithium precipitator, with reaction cavity;Circulation structure, including circulation feed pipe, circulation discharge pipe and circulation pump, circulation feed pipe and circulation discharge pipe are communicated respectively in circulation pump, circulation feed pipe is worn in lithium precipitator, and it is bent downward in lithium precipitator, and the outlet of circulation feed pipe is close to the bottom of lithium precipitator;Circulation discharge pipe is communicated with lithium precipitator, and the import of circulation discharge pipe is higher than the outlet of circulation feed pipe;Circulation feed pipe has venturi structure, and venturi structure includes throat pipe, and lithium sulfate feed inlet is provided on throat pipe;The part of circulation discharge pipe located outside lithium precipitator is provided with sodium carbonate feed inlet;Heating structure is used to maintain slurry in reaction cavity at preset temperature, the structure of the application optimizes lithium precipitator, and slurry is forced to carry out multiple external circulation, help the growth of lithium carbonate crystallization, obtain larger particle size, higher concentration lithium carbonate product.

Description

Technical Field

[0001] This utility model relates to lithium carbonate production equipment, and in particular to a lithium precipitation device with forced external circulation. Background Technology

[0002] The lithium precipitation reaction is mainly used for the precipitation and crystallization of lithium ions in the lithium salt production process. Its main function is to precipitate lithium ions from the solution in solid form by controlling the reaction conditions.

[0003] Currently, the lithium precipitation process mainly employs an intermittent operation procedure: Sodium carbonate solution prepared in the sodium carbonate solution preparation workshop is heated to 90°C by steam and then added to the lithium precipitation reactor. Lithium sulfate solution, after specific purification, impurity removal, and evaporation concentration treatment, is heated to 90°C by steam heat exchange, and then slowly added to the lithium precipitation reactor. The total feeding time and reaction time are approximately 8 hours. After the reaction is complete, the resulting lithium carbonate slurry is transported to a centrifuge for solid-liquid separation.

[0004] When using this intermittent operation process, the lithium carbonate slurry in the lithium deposition reactor is prone to agglomerate on the reactor wall and fall off, causing a series of problems such as pipe blockage and agitator damage. At the same time, the entire process chain is long, occupies a large area, and has high operating costs, which is not conducive to ensuring the long-term efficient and stable operation of the lithium deposition process. Utility Model Content

[0005] This invention provides a lithium deposition device with forced external circulation, which aims to solve the problems of clumping and damage caused by the use of stirring devices in existing equipment.

[0006] To achieve the above objectives, embodiments of this utility model provide a forced external circulation lithium deposition device, comprising:

[0007] A lithium depositor, which has a reaction chamber;

[0008] The circulation structure includes a circulation feed pipe, a circulation discharge pipe, and a circulation pump. The circulation feed pipe and the circulation discharge pipe are respectively connected to the inlet and outlet of the circulation pump. The circulation feed pipe passes through the lithium depositor and bends downward inside the lithium depositor. The outlet of the circulation feed pipe is close to the bottom of the lithium depositor. The inlet of the circulation discharge pipe is connected to the lithium depositor, and the inlet of the circulation discharge pipe is higher than the outlet of the circulation feed pipe.

[0009] The portion of the circulating feed pipe located outside the lithium depositor has a Venturi structure for increasing the dynamic pressure head of the mixed solution. The Venturi structure includes a throat on which a lithium sulfate inlet is provided.

[0010] The portion of the circulating discharge pipe located outside the lithium sinker is equipped with a sodium carbonate inlet.

[0011] The heating structure is used to maintain the slurry in the reaction chamber at a preset temperature.

[0012] Preferably, the Venturi structure further includes a contraction tube and a diffusion tube, the contraction tube and the diffusion tube gradually increasing in size from one end to the other, and the smaller end of the contraction tube and the diffusion tube respectively communicating with the two ends of the throat.

[0013] The Venturi structure also includes a sleeve, which is fitted over the outside of the throat and its two ends are connected to a contraction tube and a diffusion tube, respectively, thereby forming a feeding chamber between the sleeve and the throat. Several feed inlets are provided on the walls of the throat, contraction tube and diffusion tube in the feeding chamber, and the lithium sulfate feed inlet is provided on the wall of the sleeve.

[0014] Preferably, the circulating feed pipe has a horizontal section and a vertical section in the lithium sink, which are smoothly connected. The lower end of the horizontal section is the outlet of the circulating feed pipe. Several guide plates are also fixed on the vertical section. The plane where the guide plate is located makes an acute angle with the horizontal plane. The end of the guide plate away from the vertical section is inclined downward.

[0015] Preferably, the lower end of the lithium depositor is further provided with a lithium carbonate outlet, which includes a primary lithium carbonate outlet and a secondary lithium carbonate outlet. The primary lithium carbonate outlet is lower than the secondary lithium carbonate outlet, and the primary lithium carbonate outlet and the secondary lithium carbonate outlet are used to discharge lithium carbonate of different particle sizes.

[0016] Preferably, the lithium sinker includes a cylindrical body and a settling cone, the cylindrical body being disposed above the settling cone, and the inner cavity of the cylindrical body and the inner cavity of the settling cone forming the reaction chamber;

[0017] The top of the cylinder is provided with an openable flat cover, the bottom end of the settling cone is spherical, and the bottom of the settling cone is provided with a drain pipe, which is connected to the reaction chamber.

[0018] The primary lithium carbonate outlet and the secondary lithium carbonate outlet are located on the side wall of the settling cone.

[0019] Preferably, the lithium depositor is also provided with a lithium deposit mother liquor outlet near the upper end.

[0020] Preferably, the heating structure includes a heat tracing pipe, which is coiled around the side wall of the lithium depositor, and the heat tracing pipe is used to introduce a temperature medium;

[0021] The heat tracing pipe includes a first heat tracing pipe coiled around the outside of the cylinder and a second heat tracing pipe coiled around the outside of the settling cone.

[0022] The above-described solution of this utility model has the following beneficial effects:

[0023] 1. An improved Venturi structure is used to replace the stirring and mixing function of the stirring structure. Furthermore, the filling method of lithium sulfate is optimized by improving the Venturi structure to ensure that lithium sulfate can be added to the sodium carbonate solution slowly and evenly, avoiding agglomeration caused by improper feeding.

[0024] 2. Optimizing the structure of the lithium depositor and forcing the slurry to undergo multiple external circulations helps the growth of lithium carbonate crystals, resulting in lithium carbonate products with larger particle size and higher concentration.

[0025] 3. The baffle plate not only serves to fix the circulating feed pipe, but also increases the turbulence of the slurry in the lithium depositor, further improving the utilization of the material.

[0026] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the principle of this utility model;

[0028] Figure 2 yes Figure 1 Enlarged view of section A;

[0029] Figure 3 This is a schematic diagram of the vertical section and the guide vane;

[0030] Figure 4 This is a top view of the deflector and the vertical section;

[0031] Figure 5 This is a schematic diagram of the improved Venturi structure;

[0032] Figure 6 yes Figure 5 Enlarged view of section B.

[0033] [Explanation of Labels in the Attached Image]

[0034] 100-Lithium precipitator, 110-Cylinder body, 111-Flat cover, 112-Lithium precipitator mother liquor outlet, 113-First heat tracing pipe, 114-Second heat tracing pipe

[0035] 120 - Settlement cone, 121 - Sewage pipe

[0036] 200 - Circulation structure, 210 - Circulation feed pipe, 220 - Circulation discharge pipe, 211 - Horizontal section, 212 - Vertical section, 213 - Guide plate.

[0037] 230 - Circulation pump, 240 - Venturi structure, 241 - Throat, 242 - Lithium sulfate inlet, 243 - Sodium carbonate inlet, 244 - Contraction tube, 245 - Diffusion tube, 246 - Sleeve, 247 - Inlet

[0038] 251 - Export of primary lithium carbonate; 252 - Export of secondary lithium carbonate. Detailed Implementation

[0039] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0040] like Figures 1-5 As shown, an embodiment of this utility model provides a forced external circulation lithium deposition device, including a lithium deposition unit 100, a circulation structure 200, and a heating structure. The lithium deposition unit 100 has a reaction chamber for holding the slurry. The circulation structure 200 includes a circulation feed pipe 210, a circulation discharge pipe 220, and a circulation pump 230. The circulation pump 230 has an inlet and an outlet. The inlet of the circulation feed pipe 210 is connected to the outlet of the circulation pump 230, and the outlet of the circulation discharge pipe 220 is connected to the inlet of the circulation pump 230. The circulation feed pipe 210 passes through the side wall of the lithium deposition unit 100 and bends downward within the reaction chamber. The outlet of the circulation feed pipe 210 is close to the bottom of the lithium deposition unit 100. The inlet of the circulation discharge pipe 220 is connected to the lithium deposition unit 100, and the inlet of the circulation discharge pipe 220 is ensured to be higher than the outlet of the circulation discharge pipe 220. Under the action of the circulation pump 230, the slurry in the reaction chamber is circulated from outside the lithium depositor 100 through the circulation outlet pipe 220, the circulation pump 230 and the circulation inlet pipe 210.

[0041] The portion of the circulating feed pipe 210 located outside the lithium depositor 100 has a venturi structure 240, which is used to increase the dynamic head of the mixed solution. The venturi structure 240 has a throat 241, on which a lithium sulfate inlet 242 is provided.

[0042] A sodium carbonate inlet 243 is located on a portion of the circulating discharge pipe 220 outside the lithium depositor 100. Understandably, a sealing cap or valve is installed at the filling port to prevent backflow.

[0043] The heating structure is used to bring the slurry in the reaction chamber to a preset temperature, which is beneficial to the lithium precipitation reaction and the growth of lithium carbonate crystals.

[0044] In this application, a lithium sulfate inlet 242 is provided at the throat 241, allowing the lithium sulfate solution to be rapidly dispersed by the action of the Venturi structure 240. A sodium carbonate inlet 243 is provided at the circulation outlet pipe 220, through which the sodium carbonate solution enters the circulation outlet pipe 220. The sodium carbonate solution undergoes preliminary mixing with the lithium sulfate solution in the circulation outlet pipe 220 by the action of the circulation pump 230, and is ejected from the outlet of the circulation outlet pipe 220 at a very high speed under the action of the Venturi structure 240. It collides with the slurry that has been reacted and settled in the previous circulation in the reactor, which not only plays a stirring role, allowing the lithium sulfate solution and sodium carbonate solution to fully react and produce lithium carbonate crystals, but also prevents the phenomenon of lithium carbonate crystals clumping and adhering to the wall.

[0045] In addition to the aforementioned throat 241, the Venturi structure 240 also includes a contraction tube 244 and a diffuser tube 245. The contraction tube 244 and diffuser tube 245 have identical structures, both gradually increasing in size from one end to the other. In this embodiment, the end faces of both the contraction tube 244 and diffuser tube 245 are circular. The smaller ends of the contraction tube 244 and diffuser tube 245 are connected to the throat 241 on both sides, respectively. Liquid flowing in the circulating feed pipe 210 can generate a large dynamic head and velocity after passing through the Venturi structure 240.

[0046] When the lithium sulfate solution is filled into the lithium sulfate inlet 242 at the throat 241, the flow rate at the throat 241 is reduced due to the small cross-sectional radius. This allows the added lithium sulfate solution to slowly enter the circulating feed pipe 210 and mix with the mixture of slurry and sodium carbonate solution flowing through the circulating feed pipe, or the sodium carbonate solution itself. Subsequently, under the action of the diffuser 245, the mixed solution generates a large velocity and is quickly sprayed out from the circulating outlet pipe 220 to react.

[0047] In some embodiments of this application, the Venturi structure 240 further includes a sleeve 246, which is sleeved on the outside of the throat 241. The sleeve 246 is coaxial with the throat 241, and both ends of the sleeve 246 are connected to the contraction tube 244 and the diffuser tube 245. Under the seal of the contraction tube 244 and the diffuser tube 245, a sealed feeding chamber is formed between the throat 241 and the sleeve 246. If there are feed inlets 247 evenly arranged on the walls of the throat 241, the contraction tube 244, and the diffuser tube 245 within the range of the feeding chamber, it can be understood that the feed inlets 247 are arranged circumferentially around the throat 241, the contraction tube 244, and the diffuser tube 245.

[0048] The aforementioned lithium sulfate inlet 242 is located on the wall of the sleeve 246.

[0049] In this embodiment, the circulating feed pipe has an extension section outside the lithium depositor 100. One end of the extension section is connected to the outlet of the circulating pump 230, and the other end is connected to the larger diameter end of the shrink tube 244. The larger diameter end of the diffuser 245 is connected to the horizontal tube 211, so that the slurry entering the circulating feed pipe 210 passes through the extension section, the Venturi structure 240, the horizontal section 211 and the vertical section 212 in sequence before entering the reaction chamber.

[0050] A sleeve 246 is installed over the throat 241 of the Venturi structure 240, so that the lithium sulfate solution can enter the throat 241 uniformly and slowly through the feed port 247, thereby ensuring that the lithium sulfate solution and sodium carbonate solution are uniformly mixed.

[0051] Therefore, in this embodiment, by improving the Venturi structure 240, a mixed solution with a large dynamic head is generated, which helps the mixed solution to collide with the slurry that has been reacted and settled in the previous circulation in the reactor, thus replacing the stirring device. At the same time, the lithium sulfate solution can be added to the sodium carbonate solution uniformly and slowly, reducing the operation difficulty of the packing.

[0052] In some embodiments of this application, the circulating feed pipe 210 within the lithium depositor 100 consists of a horizontal section 211 and a vertical section 212. The horizontal section 211 connects to the upper end of the vertical section 212, and the lower end of the vertical section 212 is the outlet of the circulating discharge pipe 220. The horizontal section 211 and the vertical section 212 have a smooth transition, thereby reducing the kinetic energy loss when the mixed liquid changes direction. A plurality of guide plates 213 arranged circumferentially around the vertical section 212 are also provided on the vertical section 212. The plane containing the guide plates 213 forms an acute angle with the horizontal plane. The guide plates 213 have a free end and a fixed end fixed to the vertical section 212. The free end is lower than the fixed end and is fixed to the inner wall of the lithium depositor 100.

[0053] In this embodiment, the guide plate 213 serves two purposes: firstly, it provides support to prevent the lithium deposition device from becoming unstable due to excessive vibration of the circulating discharge pipe 220; secondly, the mixed solution bounces off the bottom of the device and impacts the guide plate 213, increasing turbulence and improving the mixing effect.

[0054] Preferably, the vertical section 212 is located on the central axis of the lithium sink 100.

[0055] Preferably, the plane containing the guide plate 213 forms an angle of 45 degrees with the horizontal plane, and the line connecting the free end and the fixed end of the guide plate 213 forms an angle of 60 degrees with the axis of the vertical section 212. When setting the guide plate 213, the direction of the line connecting the free end and the fixed end is defined as the direction of the long side of the guide plate 213. First, the guide plate 213 is placed vertically and rotated 45° around the long side of the guide plate 213. Then, the free end is rotated upward with the fixed end as the rotation point, so that the long side forms an angle of 60° with the axis of the vertical section 212. Finally, the fixed end is welded to the vertical section 212, and the free end is welded to the inner wall of the lithium depositor 100.

[0056] In some embodiments of this application, the lower end of the lithium depositor 100 is further provided with a lithium carbonate outlet, including a primary lithium carbonate outlet 251 and a secondary lithium carbonate outlet 252. These two different lithium carbonate outlets are used to discharge lithium sulfate with different particle sizes. In this embodiment, the primary lithium carbonate outlet 251, used to discharge larger particle sizes, is located below the secondary lithium carbonate outlet 252, used to discharge smaller particle sizes. It is understood that a switch or valve is provided at the lithium carbonate outlet.

[0057] In some embodiments of this application, the lithium depositor 100 includes a cylindrical body 110 and a settling cone 120. The cylindrical body 110 is cylindrical and has open ends. The settling cone 120 has a generally conical profile, with the upper end having the same shape as the cylindrical body 110 and the lower end gradually narrowing in diameter. The inner cavity of the settling cone 120 is also conical. The cylindrical body 110 is positioned above the settling cone 120 and connected to it. The inner cavity of the cylindrical body 110 and the inner cavity of the settling cone 120 communicate to form the aforementioned reaction chamber.

[0058] A flat cover 111 is provided at the top of the cylinder 110, and the flat cover 111 can be opened. The end cap at the bottom of the settling cone 120 is spherical, and a drain pipe 121 is provided at the bottom of the settling cone 120, which connects to the reaction chamber. Understandably, a switch or valve is provided on the drain pipe 121.

[0059] The aforementioned primary lithium carbonate outlet 251 and secondary lithium carbonate outlet 252 are located on the side wall of the settling cone 120. The aforementioned guide plate 213 is welded to the inner wall of the settling cone 120.

[0060] The horizontal section 211 of the aforementioned circulating feed pipe 210 passes through the side wall of the cylinder 110, the vertical section 212 coincides with the axis of the settling cone 120, and the outlet of the circulating discharge pipe 220 is located on the cylinder 110.

[0061] In some embodiments of this application, the lithium depositor 100 is further provided with a lithium deposit mother liquor outlet 112 near its upper end, and the lithium deposit mother liquor outlet 112 is located on the side wall of the cylinder 110. It is understood that the lithium deposit mother liquor outlet 112 is higher than the inlet of the circulation discharge pipe 220, and a switch or valve is provided on the lithium deposit mother liquor outlet 112.

[0062] The aforementioned heating structure includes a heat tracing pipe, which is coiled around the side wall of the lithium depositor 100. The heat tracing pipe is used to introduce a medium, such as steam or water, and to use heat exchange to keep the slurry in the lithium depositor 100 within a preset temperature range.

[0063] Preferably, in this embodiment, two heat tracing pipes are provided, namely a first heat tracing pipe 113 and a second heat tracing pipe 114, wherein the first heat tracing pipe 113 is coiled around the outside of the cylinder 110, and the second heat tracing pipe 114 is coiled around the outside of the settling cone 120.

[0064] In this embodiment, steam is introduced into the heat tracing pipe. The steam enters from the inlet at the upper end of the first heat tracing pipe 113 and the second heat tracing pipe 114 and flows out from the outlet at the lower end. This arrangement ensures that the condensate formed by the steam flows smoothly out from the lower outlet of the heat tracing pipe.

[0065] Preferably, the steam temperature in the first heat tracing pipe 113 and the second heat tracing pipe 114 is between 85-95°C.

[0066] In this application, the stirring device is eliminated, and the venturi structure 240 is used to accelerate the mixed solution, resulting in a high dynamic head. The mixed solution collides with the slurry that has already reacted and settled in the preceding circulation within the reactor, which facilitates the mixing and stirring of the lithium sulfate solution and sodium carbonate solution, thereby increasing the reaction rate. During the crystallization and growth process, lithium carbonate is continuously impacted by the fluid, reducing the probability of it adhering to the inner wall of the lithium depositor and the inner wall of the pipes.

[0067] Secondly, by utilizing the structural characteristics of the lithium precipitator 100, the forced slurry to participate in multiple cycles helps to increase the crystal size of lithium carbonate, resulting in lithium carbonate products with larger particle size, higher concentration, and better quality, while also making full use of the corresponding elements in the slurry.

[0068] Finally, the improvement of the Venturi structure 240 facilitates the slow, uniform addition and rapid dispersion of lithium sulfate solution, allowing it to mix more thoroughly with sodium carbonate solution, thus solving the problem of rapid reaction agglomeration caused by the inability of existing feeding technologies to add materials uniformly.

[0069] The method of using this application is as follows:

[0070] First, a sodium carbonate solution is added to the lithium depositor 100, ensuring the sodium carbonate level is high enough to allow it to be drained out of the lithium depositor 100. The sodium carbonate solution in the reaction chamber is preheated to a preset temperature and maintained at this preset temperature during the lithium deposit process.

[0071] In this application, a sodium carbonate solution is added to the lithium precipitator 100 by opening the flat cover 111. The liquid level of the sodium carbonate solution is higher than the height of the circulation outlet pipe 220, so that the sodium carbonate solution can be discharged from the lithium precipitator 100 through the circulation outlet pipe 220. Preferably, the liquid level of the sodium carbonate solution is also lower than the lithium precipitator mother liquor outlet 112.

[0072] In this application, a heating structure is used to raise the sodium carbonate solution in the reaction chamber to 85-95°C. Specifically, steam is introduced into the first heat tracing pipe 113 and the second heat tracing pipe 114 respectively. The heat exchange of the steam raises the sodium carbonate solution in the reaction chamber to the preset temperature. Using two heat tracing pipes to maintain the same temperature for the cylinder 110 and the settling cone 120 as a whole is ensured.

[0073] Second, the slurry in the reaction chamber is discharged outside the lithium depositor 100.

[0074] In this application, before the first cycle, the slurry in the lithium depositor 100 is a sodium carbonate solution. After one cycle, the slurry in the reactor is a combination solution of sodium carbonate solution, lithium sulfate solution, and their reactants. The circulation pump 230 is turned on to force the slurry out of the reaction chamber along the circulation discharge pipe 220, and the slurry circulates outside the lithium depositor 100.

[0075] Third, lithium sulfate solution and sodium carbonate solution are added to the exported slurry to form a mixed solution.

[0076] In this application, sodium carbonate solution is first added through sodium carbonate inlet 243, and lithium sulfate solution is added through lithium sulfate inlet 242. Due to the presence of the Venturi structure 240, the lithium sulfate solution can slowly enter the throat 241, achieving slow and uniform addition of lithium sulfate solution. After the lithium sulfate solution mixes with the sodium carbonate solution and slurry, a mixed solution is formed. The mixed solution gains a high velocity under the action of the diffuser 245. The high-velocity mixed solution impacts the slurry at the bottom of the lithium settling tank 100, causing collisions and mixing between the mixed solution and the slurry, which acts as a stirrer, ensuring that the lithium sulfate solution and sodium carbonate solution mix to form lithium carbonate crystals. Larger-diameter lithium carbonate crystals precipitate at the bottom of the lithium settling tank 100, that is, below the settling cone 120. The high-velocity mixed solution also agitates the lithium carbonate crystals settled at the bottom of the settling cone 120, preventing agglomeration and pipe blockage. Other smaller lithium carbonate crystals are recycled through the slurry discharge pipe 220 until they settle at the bottom of the lithium settling tank 100 due to their increased volume.

[0077] During the circulation process, the guide plate 213 not only fixes the vertical section 212, but also increases the turbulence of the slurry and improves the reaction efficiency.

[0078] Fourth, wait for lithium carbonate to crystallize and precipitate, forming lithium carbonate particles, which are then discharged from the bottom of the reaction chamber.

[0079] In this application, due to the continuous collision and mixing of lithium sulfate solution and sodium carbonate solution, lithium carbonate crystals are generated, and larger lithium carbonate crystals are deposited at the bottom of the lithium precipitator 100. The lithium carbonate deposited at the bottom of the lithium precipitator 100 is discharged from the lithium precipitator 100 according to the size of the formed lithium carbonate crystals.

[0080] In this application, there are a primary lithium carbonate outlet 251 and a secondary lithium carbonate outlet 252, wherein the primary lithium carbonate outlet 251 is lower than the secondary lithium carbonate outlet 252. Therefore, most of the larger lithium carbonate particles deposited at the bottom of the lithium depositor 100 can be discharged from the primary lithium carbonate outlet 251, and most of the smaller lithium carbonate particles can be discharged from the secondary lithium carbonate outlet 252. The primary lithium carbonate outlet 251 and the secondary lithium carbonate outlet 252 discharge materials intermittently.

[0081] During the lithium precipitation process, the continuous addition of sodium carbonate solution and lithium sulfate solution causes the liquid level in the lithium precipitation tank 100 to rise continuously. Furthermore, the material imbalance within the lithium precipitation tank 100 necessitates periodically opening the lithium precipitation mother liquor outlet 112 to discharge the lithium precipitation mother liquor into subsequent processes for decarbonization.

[0082] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A lithium deposition device with forced external circulation, characterized in that, include: Lithium depositor (100) has a reaction chamber; The circulation structure (200) includes a circulation feed pipe (210), a circulation discharge pipe (220), and a circulation pump (230). The circulation feed pipe (210) and the circulation discharge pipe (220) are respectively connected to the inlet and outlet of the circulation pump (230). The circulation feed pipe (210) passes through the lithium depositor (100) and bends downward inside the lithium depositor (100). The outlet of the circulation feed pipe (210) is close to the bottom of the lithium depositor (100). The inlet of the circulation discharge pipe (220) is connected to the lithium depositor (100), and the inlet of the circulation discharge pipe (220) is higher than the outlet of the circulation feed pipe (210). The portion of the circulating feed pipe (210) outside the lithium depositor (100) has a Venturi structure (240) for increasing the dynamic pressure head of the mixed solution. The Venturi structure (240) includes a throat (241) on which a lithium sulfate inlet (242) is provided. The portion of the circulating discharge pipe (220) located outside the lithium depositor (100) is provided with a sodium carbonate inlet (243). The heating structure is used to maintain the slurry in the reaction chamber at a preset temperature.

2. The forced external circulation lithium deposition device according to claim 1, characterized in that: The Venturi structure (240) further includes a constriction tube (244) and a diffuser tube (245), the constriction tube (244) and the diffuser tube (245) gradually increase in size from one end to the other, and the smaller end of the constriction tube (244) and the diffuser tube (245) are respectively connected to both ends of the throat tube (241); The Venturi structure (240) also includes a sleeve (246), which is sleeved on the outside of the throat (241) and the two ends of the sleeve (246) are connected to the contraction tube (244) and the diffusion tube (245) respectively, thereby forming a feeding chamber between the sleeve (246) and the throat (241). Several feed inlets (247) are provided on the tube walls of the throat (241), contraction tube (244) and diffusion tube (245) in the feeding chamber. The lithium sulfate feed inlet (242) is provided on the tube wall of the sleeve (246).

3. The forced external circulation lithium deposition device according to claim 1, characterized in that: The circulating feed pipe (210) inside the lithium sink (100) is divided into a horizontal section (211) and a vertical section (212). The horizontal section (211) and the vertical section (212) are smoothly connected. The lower end of the horizontal section (211) is the outlet of the circulating feed pipe (210). Several guide plates (213) are also fixed on the vertical section (212). The plane where the guide plate (213) is located makes an acute angle with the horizontal plane. The end of the guide plate (213) away from the vertical section (212) is inclined downward.

4. The forced external circulation lithium deposition device according to claim 1, characterized in that: The lower end of the lithium depositor (100) is also provided with a lithium carbonate outlet, which includes a primary lithium carbonate outlet (251) and a secondary lithium carbonate outlet (252). The primary lithium carbonate outlet (251) is lower than the secondary lithium carbonate outlet (252). The primary lithium carbonate outlet (251) and the secondary lithium carbonate outlet (252) are used to discharge lithium carbonate of different particle sizes.

5. The forced external circulation lithium deposition device according to claim 4, characterized in that: The lithium sinker (100) includes a cylindrical body (110) and a settling cone (120). The cylindrical body (110) is disposed above the settling cone (120), and the inner cavity of the cylindrical body (110) and the inner cavity of the settling cone (120) constitute the reaction chamber. The top of the cylinder (110) is provided with an openable flat cover (111), the bottom end of the settling cone (120) is spherical, and the bottom of the settling cone (120) is provided with a drain pipe (121), which is connected to the reaction chamber. The primary lithium carbonate outlet (251) and the secondary lithium carbonate outlet (252) are located on the side wall of the settling cone (120).

6. The lithium deposition device with forced external circulation according to claim 1, characterized in that: The lithium depositor (100) is also provided with a lithium deposit mother liquor outlet (112) near the upper end.

7. The lithium deposition device with forced external circulation according to claim 5, characterized in that: The heating structure includes a heat tracing pipe, which is coiled around the side wall of the lithium depositor (100) and is used to introduce a temperature medium. The heat tracing pipe includes a first heat tracing pipe (113) coiled outside the cylinder (110) and a second heat tracing pipe (114) coiled outside the settling cone (120).

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