Lithium precipitation crystallizer system and method

Abstract

The invention provides a lithium precipitation crystallizer system and method. The lithium precipitation crystallizer system comprises a shell, a feeding pipe, guide cylinders, a discharging pipe, a mixing assembly and a stirring assembly, the discharging pipe is arranged at the bottom of the shell, the guide cylinders comprise the first guide cylinder, the first guide cylinder is arranged in the shell, the bottom of the first guide cylinder is closed, the upper portion of the first guide cylinder is open, and the feeding pipe is connected to the first guide cylinder; the stirring end of the stirring assembly extends into the first guide cylinder, the feeding pipe comprises a first feeding pipe and a second feeding pipe, the material mixing assembly is arranged in the first guide cylinder, a first material flows into the material mixing assembly through the first feeding pipe, and a second material flows into the material mixing assembly through the second feeding pipe; and the first material and the second material are mixed in the material mixing assembly and then flow to the first guide cylinder. According to the lithium precipitation crystallizer system and method provided by the invention, the technical problem of insufficient reaction caused by non-uniform material mixing is effectively solved, and the crystallization quality and production efficiency of lithium carbonate are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium carbonate preparation, and in particular to a lithium precipitation crystallizer system and method. Background Art

[0002] Lithium carbonate has become one of the important raw materials in industrial production and manufacturing due to its unique physical and chemical properties. Lithium carbonate can be used to manufacture lithium-ion batteries, which has made a significant contribution to promoting global energy transformation and reducing carbon emissions. Secondly, lithium carbonate is widely used to prepare lithium compounds such as lithium hydroxide and metallic lithium, which have irreplaceable applications in aviation, medicine, glass and ceramic manufacturing and other industries. Therefore, lithium carbonate is not only an important basic material for modern industry, but also a key resource for promoting scientific and technological progress and responding to environmental challenges. Its stable supply and quality improvement have a far-reaching impact on ensuring the security of the global supply chain and promoting sustainable development.

[0003] Lithium carbonate precipitation and crystallization is a key step in the process of lithium extraction from brine. Its main purpose is to generate lithium carbonate crystals from brine solution containing lithium ions through chemical reaction. Lithium carbonate precipitation and crystallization usually use evaporation crystallizer or stirring crystallizer to extract lithium carbonate crystals from brine solution. However, the existing lithium carbonate precipitation and crystallization equipment cannot fully and evenly mix the materials during the lithium precipitation and crystallization process, resulting in insufficient reaction between lithium solution and soda ash solution, which seriously affects the formation of lithium carbonate crystals, and then leads to reduced product quality and production efficiency. Summary of the invention

[0004] The main purpose of the present invention is to provide a lithium precipitation crystallizer system and method, which effectively solves the technical problem of insufficient reaction caused by uneven material mixing and improves the crystallization quality and production efficiency of lithium carbonate.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a lithium precipitation crystallizer system is provided, including a shell, a feed pipe, a guide tube, a discharge pipe, a mixing assembly and a stirring assembly, the discharge pipe is arranged at the bottom of the shell, the guide tube includes a first guide tube, the first guide tube is arranged in the shell, the bottom of the first guide tube is closed and the top is open, the feed pipe is connected to the first guide tube, the stirring end of the stirring assembly extends into the first guide tube, the feed pipe includes a first feed pipe and a second feed pipe, the mixing assembly is arranged in the first guide tube, the first material flows into the mixing assembly from the first feed pipe, the second material flows into the mixing assembly from the second feed pipe, and the first material and the second material are mixed in the mixing assembly and then flow to the first guide tube.

[0006] Furthermore, the mixing assembly includes a mixer and a distribution pipe, the mixer includes a first mixer, the first mixer is arranged in the first guide tube, the distribution pipe includes a first distribution pipe and a second distribution pipe, the first distribution pipe and the second distribution pipe are arranged along the inner wall of the first guide tube, the first distribution pipe is connected to the first feed pipe, the second distribution pipe is connected to the second feed pipe, the first mixer is connected to the first distribution pipe and the second distribution pipe, and the first mixer is provided with a mixed liquid outlet.

[0007] Further, the first distribution pipe and the second distribution pipe are arranged on the first guide tube, and the first distribution pipe is arranged below the second distribution pipe; or, the first distribution pipe is arranged on the first guide tube, and the second distribution pipe is arranged on the inner side of the first distribution pipe.

[0008] Further, the first mixer includes a first mixing tube and a second mixing tube, the first mixing tube includes a first vertical section, a second vertical section and a first bending section, the second mixing tube includes a third vertical section, a fourth vertical section and a second bending section, one end of the first vertical section is connected to the first distribution tube, and the other end is connected to the second vertical section through the first bending section, the first vertical section extends downward, the first bending section bends upward, and the second vertical section extends upward, one end of the third vertical section is connected to the second distribution tube, and the other end is connected to the fourth vertical section through the second bending section, the third vertical section extends upward, the second bending section bends downward, and the fourth vertical section extends downward, one end of the fourth vertical section away from the second bending section is connected to one end of the second vertical section away from the first bending section, and a mixed liquid outlet is provided on the second vertical section.

[0009] Furthermore, the diameter of the first mixing tube is greater than the diameter of the second mixing tube, and the diameter ratio of the first mixing tube to the second mixing tube is in a range of 1.2:1 to 1.4:1.

[0010] Furthermore, the plurality of first mixers are evenly distributed along the circumferential direction on the inner wall of the first guide tube.

[0011] Furthermore, the mixer also includes a second mixer, which is arranged in the first guide tube, and the distribution pipe also includes a third distribution pipe and a fourth distribution pipe, the third distribution pipe is connected to the first feed pipe, the fourth distribution pipe is connected to the second feed pipe, the second mixer is connected to the third distribution pipe and the fourth distribution pipe, and the second mixer is provided with a mixed liquid outlet.

[0012] Further, the third distribution pipe and the fourth distribution pipe are arranged on the first guide tube, and the fourth distribution pipe is arranged below the third distribution pipe; or, the third distribution pipe is arranged on the first guide tube, and the fourth distribution pipe is arranged on the inner side of the third distribution pipe.

[0013] Further, the second mixer includes a third mixing tube and a fourth mixing tube, the third mixing tube includes a fifth vertical section, a sixth vertical section and a third bending section, the fourth mixing tube includes a seventh vertical section, an eighth vertical section and a fourth bending section, one end of the fifth vertical section is connected to the third distribution tube, and the other end is connected to the sixth vertical section through the third bending section, the fifth vertical section extends upward, the third bending section is bent downward, and the sixth vertical section extends downward, one end of the seventh vertical section is connected to the fourth distribution tube, and the other end is connected to the eighth vertical section through the fourth bending section, the seventh vertical section extends downward, the fourth bending section is bent upward, the eighth vertical section extends upward, one end of the sixth vertical section away from the third bending section is connected to one end of the eighth vertical section away from the fourth bending section, and a mixed liquid outlet is provided on the sixth vertical section.

[0014] Furthermore, the diameter of the third mixing tube is greater than the diameter of the fourth mixing tube, and the diameter ratio of the third mixing tube to the fourth mixing tube is in a range of 1:0.7 to 1:0.5.

[0015] Furthermore, the plurality of second mixers are evenly distributed along the circumferential direction on the inner wall of the first guide tube.

[0016] Furthermore, the stirring assembly includes a driving device, a rotating shaft and a stirring structure. The driving device is arranged on the shell, one end of the rotating shaft is drivingly connected to the driving device, and the other end extends into the first guide tube. The stirring structure is arranged on the rotating shaft.

[0017] Furthermore, the stirring structure includes a first stirring part, which is disposed on the rotating shaft, and the first stirring part stirs the material in the first flow guide cylinder to move upward along the first flow guide cylinder.

[0018] Furthermore, the stirring structure also includes a second stirring part, the mixer includes a first mixer and a second mixer, the first stirring part is arranged at the discharge position of the first mixer, the second stirring part is arranged on the rotating shaft, and the second stirring part is arranged at the discharge position of the second mixer, and the second stirring part stirs the material in the first guide tube to move upward along the first guide tube.

[0019] Furthermore, the flow guide tube also includes a second flow guide tube, which is arranged between the first flow guide tube and the shell, one end of the second flow guide tube is connected to the shell, a material flow area is formed between the second flow guide tube and the first flow guide tube, an overflow area is formed between the second flow guide tube and the shell, the material flow area and the overflow area are connected at the bottom, an overflow port is arranged on the shell, and the overflow port is connected to the overflow area.

[0020] Furthermore, an annular plate is provided in the overflow area, and a water filter is provided on the annular plate.

[0021] Furthermore, the plurality of water filters are evenly distributed along the circumference of the annular plate.

[0022] Furthermore, the lithium precipitation crystallizer system also includes a heating component, and the heating component is arranged on the shell.

[0023] A lithium precipitation crystallization method is also provided, comprising:

[0024] Adding lithium chloride solution and soda ash solution to the mixing component in the first guide tube; mixing the lithium chloride solution and the soda ash solution in the mixing component and flowing out into the first guide tube;

[0025] The mixed liquid in the first guide tube is stirred, and the mixed liquid reacts to obtain lithium carbonate.

[0026] Further, the step of adding lithium chloride solution and soda ash solution to the mixing assembly in the first guide tube includes:

[0027] Adding soda ash solution into the lithium precipitation crystallizer system;

[0028] Heating lithium precipitation crystallizer system;

[0029] When the liquid level of the soda ash solution in the first guide tube reaches the stirring area where the second stirring part is located, the driving device is started;

[0030] Add lithium chloride solution and soda ash solution into the mixing assembly at the same time.

[0031] Furthermore, the concentration of the soda ash solution is adjusted to 300 g / L, and after filtering the impurity particles and colloids in the soda ash solution, the soda ash solution is added into the lithium precipitation crystallizer system.

[0032] Further, the step of heating the lithium precipitation crystallizer system includes:

[0033] The lithium precipitation crystallizer system is heated by a heating component, and the internal temperature of the lithium precipitation crystallizer is controlled between 90°C and 95°C, so that the soda ash solution is in a boiling state.

[0034] According to the technical solution of the present invention, the shell is used to contain materials and provide a closed reaction environment for them to ensure the safety of the reaction process, prevent material leakage, and maintain the stability of the internal reaction environment; the first feed pipe and the second feed pipe are used to transport the lithium chloride solution and the soda ash solution to accurate positions respectively; the discharge pipe is used to discharge the lithium carbonate crystals after the reaction is completed from the system to avoid the accumulation and blockage of lithium carbonate crystals in the reactor, which is helpful to achieve continuous processing and transportation of lithium carbonate crystals; the mixing component is mainly used to pre-mix the lithium chloride solution and the soda ash solution before entering the reaction area to avoid incomplete reaction due to uneven local reactant concentration after the lithium chloride solution and the soda ash solution directly enter the crystallizer, thereby affecting the quality of the lithium carbonate crystals; the first guide tube is used to guide the mixed material into the reaction area, and cooperate with the stirring component to form a specific flow field in the reaction area, so that the mixed liquid is fully stirred and reacted, thereby improving the production quality and efficiency of the lithium chloride product, and the closed bottom design of the first guide tube can ensure that the material entering the guide tube can only flow out through the upper opening, thereby controlling the flow path of the material and preventing the already settled The lithium carbonate crystals precipitated to the bottom of the crystallizer are stirred and returned to the reaction area in the first guide tube. The closed bottom design also helps to reduce the circulation of the reaction completion liquid, and avoids the impurities in the mixed liquid after the reaction is completed from entering the reaction area again from the bottom of the first guide tube, affecting the reaction process; the design of the opening on the top of the first guide tube can ensure that the mixed liquid flows from the top of the first guide tube to the material flow area under the action of the stirring component, and the stirring structure can more effectively improve the efficiency of material mixing; the function of the stirring component is to rotate and stir the mixed material in the first guide tube, further improve the uniformity of material mixing, and make the mixed material fully react in the reaction area. At the same time, the stirring component stirs the mixed material and drives the mixed material to flow upward, so that the mixed material flows from the opening on the top of the first guide tube to the material flow area; the lithium precipitation crystallizer system proposed by the present invention pre-mixes the lithium chloride solution and the soda ash solution before entering the reaction area by setting a mixing component, which significantly improves the mixing effect of the materials, thereby effectively solving the problem of insufficient reaction due to uneven material mixing, thereby improving the crystallization quality and production efficiency of lithium carbonate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 The overall structural schematic diagram of the lithium sinking crystallizer system of an embodiment of the present invention is shown;

[0037] Figure 2A schematic diagram of the overall structure of a first guide tube and a mixing assembly of a lithium precipitation crystallizer system according to an embodiment of the present invention is shown;

[0038] Figure 3 A schematic diagram showing the overall structure of a first mixer of a lithium precipitation crystallizer according to an embodiment of the present invention is shown;

[0039] Figure 4 A schematic diagram showing the overall structure of a second mixer of a lithium precipitation crystallizer according to an embodiment of the present invention; and

[0040] Figure 5 A top view of a mixing assembly of a lithium sinking crystallizer system according to an embodiment of the present invention is shown.

[0041] The above drawings include the following reference numerals:

[0042] 1. Shell; 2. First feed pipe; 3. Second feed pipe; 4. First guide tube; 5. First feed port; 6. Second feed port; 7. Third feed port; 8. Fourth feed port; 9. Second guide tube; 10. Discharge pipe; 11. Driving device; 12. Rotating shaft; 13. First stirring part; 14. Second stirring part; 15. First mixer; 151. First mixing tube; 1511. First vertical section; 1512. Second vertical section; 1513. First bending section; 152. Second mixing tube; 1521. Third vertical section; 1522. Fourth vertical section; 1523. Second bending section; 16. Second mixer; 161. Third mixing pipe; 1611. Fifth vertical section; 1612. Sixth vertical section; 1613. Third bending section; 162. Fourth mixing pipe; 1621. Seventh vertical section; 1622. Eighth vertical section; 1623. Fourth bending section; 17. Distribution pipe; 171. First distribution pipe; 172. Second distribution pipe; 173. Third distribution pipe; 174. Fourth distribution pipe; 18. Material flow area; 19. Overflow area; 20. Overflow port; 21. Ring plate; 22. Water filter; 23. Drain port; 24. Heating assembly; 25. Mixed liquid outlet. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] like Figures 1 to 5As shown, according to an embodiment of the present invention, a lithium precipitation crystallizer system includes a shell 1, a feed pipe, a guide tube, a discharge pipe 10, a mixing assembly and a stirring assembly, the discharge pipe 10 is arranged at the bottom of the shell 1, the guide tube includes a first guide tube 4, the first guide tube 4 is arranged in the shell 1, the first guide tube 4 is closed at the bottom and opened at the top, the feed pipe is connected to the first guide tube 4, the stirring end of the stirring assembly extends into the first guide tube 4, the feed pipe includes a first feed pipe 2 and a second feed pipe 3, the mixing assembly is arranged in the first guide tube 4, the first material flows into the mixing assembly from the first feed pipe 2, the second material flows into the mixing assembly from the second feed pipe 3, the first material and the second material are mixed in the mixing assembly and flow to the first guide tube 4.

[0045] In the above technical scheme, the shell 1 is used to contain the material and provide a closed reaction environment for it to ensure the safety of the reaction process, prevent material leakage, and maintain the stability of the internal reaction environment; the first feed pipe 2 and the second feed pipe 3 are used to transport the lithium chloride solution and the soda ash solution to the accurate position respectively; the discharge pipe 10 is used to discharge the lithium carbonate crystals after the reaction is completed from the system to avoid the accumulation and blockage of lithium carbonate crystals in the reactor, which is helpful to achieve the continuous processing and transportation of lithium carbonate crystals; the mixing component is mainly used to pre-mix the lithium chloride solution and the soda ash solution before entering the reaction area to avoid the lithium chloride solution and the soda ash solution directly entering the crystallizer. The reaction is incomplete due to uneven concentration of local reactants, thereby affecting the quality of the lithium carbonate crystals; the first guide tube 4 is used to guide the mixed material into the reaction area, and cooperate with the stirring component to form a specific flow field in the reaction area, so that the mixed liquid is fully stirred and reacted, thereby improving the production quality and efficiency of lithium chloride products. The closed bottom design of the first guide tube 4 can ensure that the material entering the guide tube can only flow out through the upper opening, thereby controlling the flow path of the material and preventing the precipitation to the crystallizer. The lithium carbonate crystals at the bottom of the crystallizer are stirred back to the reaction area in the first guide tube 4. The closed bottom design also helps to reduce the circulation of the reaction completion liquid, and avoids the impurities in the mixed liquid after the reaction is completed from entering the reaction area again from the bottom of the first guide tube 4, affecting the reaction process; the design of the opening at the top of the first guide tube 4 can ensure that the mixed liquid flows from the top of the first guide tube 4 to the material flow area 18 under the action of the stirring component, and the stirring structure can more effectively improve the efficiency of material mixing; the function of the stirring component is to rotate and stir the mixed material in the first guide tube 4, further improve the uniformity of material mixing, and make the mixed material fully react in the reaction area. At the same time, the stirring component stirs the mixed material and drives the mixed material to flow upward, so that the mixed material flows from the opening at the top of the first guide tube 4 to the material flow area 18; the lithium precipitation crystallizer system proposed by the present invention pre-mixes the lithium chloride solution and the soda ash solution before entering the reaction area by setting a mixing component, which significantly improves the mixing effect of the materials, thereby effectively solving the problem of insufficient reaction due to uneven material mixing, thereby improving the crystallization quality and production efficiency of lithium carbonate.

[0046] In one embodiment, the mixing assembly includes a mixer and a distribution pipe 17, the mixer includes a first mixer 15, the first mixer 15 is arranged in the first guide tube 4, the distribution pipe 17 includes a first distribution pipe 171 and a second distribution pipe 172, the first distribution pipe 171 and the second distribution pipe 172 are arranged along the inner wall of the first guide tube 4, the first distribution pipe 171 is connected to the first feed pipe 2, the second distribution pipe 172 is connected to the second feed pipe 3, the first mixer 15 is connected to the first distribution pipe 171 and the second distribution pipe 172, and the first mixer 15 is provided with a mixed liquid outlet 25.

[0047] In the above technical scheme, the first mixer 15 is located inside the first guide tube 4, and premixes the lithium chloride solution and the soda ash solution to ensure that the lithium chloride solution and the soda ash solution reach a sufficient and uniform mixing state before entering the guide tube, thereby improving the reaction efficiency and product quality of lithium precipitation crystallization; the first distribution pipe 171 is connected to the first feed pipe 2, and is used to convey the first material to the first mixer 15, and the second distribution pipe 172 is connected to the second feed pipe 3, and is responsible for conveying the second material to the first mixer 15. In the first mixer 15, the first material and the second material contact each other and are fully mixed. When multiple mixers are arranged in the first guide tube 4, the material is evenly flowed into each mixer through the distribution pipe 17, thereby improving the mixing efficiency and quality of the material in the mixer; the mixed liquid outlet 25 is arranged on the first mixer 15, and the premixed mixed liquid flows out of the first mixer 15 from the mixed liquid outlet 25 to reach the reaction area in the first guide tube 4.

[0048] In one embodiment, the first distribution pipe 171 and the second distribution pipe 172 are arranged on the first guide tube 4, and the first distribution pipe 171 is arranged below the second distribution pipe 172; or, the first distribution pipe 171 is arranged on the first guide tube 4, and the second distribution pipe 172 is arranged on the inner side of the first distribution pipe 171.

[0049] In the above technical solution, by arranging the first distribution pipe 171 below the second distribution pipe 172, or arranging the second distribution pipe 172 on the inner side of the first distribution pipe 171, the lithium chloride solution and the soda ash solution enter the mixing area through different paths before entering the reaction area in the first guide tube 4. Through the conveying pressure of the lithium chloride solution and the soda ash solution in the pipeline, the lithium chloride solution and the soda ash solution are pressed into the mixing assembly from the first distribution pipe 171 and the second distribution pipe 172, so that the lithium chloride solution and the soda ash solution contact and mix with each other at the mixing position in the mixing assembly, thereby promoting convection of the two solutions, thereby improving the mixing efficiency and quality of the lithium chloride solution and the soda ash solution.

[0050] In one embodiment, a spacer is disposed between the first material distribution tube 171 and the second material distribution tube 172 .

[0051] In the above technical solution, by providing a spacer between the first distribution pipe 171 and the second distribution pipe 172, it is further ensured that the lithium chloride solution and the soda ash solution in the first distribution pipe 171 and the second distribution pipe 172 will not contact and mix with each other before reaching the mixing position in the mixer.

[0052] In one embodiment, the optional pipeline specification of the distribution pipe 17 includes DN150, and the distribution pipe 17 is divided into a first distribution pipe 171 and a second distribution pipe 172 by a partition, and the ratio of the cross-sectional area of ​​the first distribution pipe 171 to the second distribution pipe 172 is 2:1.

[0053] In the above technical solution, compared with the method of setting two independent first distribution tubes 171 and second distribution tubes 172, the method of dividing the interior of one distribution tube 17 into the first distribution tube 171 and the second distribution tube 172 reduces the difficulty of installation and fixation.

[0054] In one embodiment, the first mixer 15 includes a first mixing tube 151 and a second mixing tube 152. The first mixing tube 151 includes a first vertical section 1511, a second vertical section 1512 and a first bending section 1513. The second mixing tube 152 includes a third vertical section 1521, a fourth vertical section 1522 and a second bending section 1523. One end of the first vertical section 1511 is connected to the first distribution tube 171, and the other end is connected to the second vertical section 1512 through the first bending section 1513. The first vertical section 1511 extends downward, and the first bending section 1513 is connected to the second vertical section 1512. 513 bends upward, the second vertical section 1512 extends upward, one end of the third vertical section 1521 is connected to the second distribution pipe 172, and the other end is connected to the fourth vertical section 1522 through the second bending section 1523, the third vertical section 1521 extends upward, the second bending section 1523 bends downward, the fourth vertical section 1522 extends downward, one end of the fourth vertical section 1522 away from the second bending section 1523 is connected to one end of the second vertical section 1512 away from the first bending section 1513, and the second vertical section 1512 is provided with a mixed liquid outlet 25.

[0055] In the above technical solution, the lithium chloride solution in the first distribution pipe 171 flows downward under the guidance of the first vertical section 1511, and then the lithium chloride solution enters the first bending section 1513, and the first bending section 1513 bends upward, changing the flow direction of the lithium chloride solution, and then the lithium chloride solution enters the second vertical section 1512 through the first bending section 1513; the soda ash solution in the second distribution pipe 172 flows upward under the guidance of the third vertical section 1521, and then the soda ash solution enters the second bending section 1523, and the second bending section 1523 bends downward, changing the flow direction of the soda ash solution, and then the soda ash solution enters the second vertical section 1512 through the first bending section 1513, and the end of the fourth vertical section 1522 away from the second bending section 1523 is connected to the end of the second vertical section 1512 away from the first bending section 1513, so that the lithium chloride solution and the soda ash solution contact and mix with each other, and premixing is completed in the mixing area at the mixed liquid outlet 25, and the premixed mixed liquid flows through the mixed liquid outlet 25 to the reaction area in the first guide tube 4.

[0056] In one embodiment, the diameter of the first mixing tube 151 is greater than the diameter of the second mixing tube 152 , and the diameter ratio of the first mixing tube 151 to the second mixing tube 152 is in a range of 1.2:1 to 1.4:1.

[0057] In the above technical solution, the density of the lithium chloride solution is greater than that of the soda ash solution, and it may have a higher viscosity at a higher concentration. Using a second mixing tube 152 with a smaller diameter to transport the soda ash solution can make the soda ash solution have a higher flow rate in the second mixing tube 152, thereby helping to overcome the influence of density and viscosity and ensure that the soda ash solution can be quickly mixed with the lithium chloride solution after being injected into the first mixing tube 151.

[0058] In one embodiment, the plurality of first mixers 15 are evenly distributed along the circumferential direction on the inner wall of the first guide tube 4 .

[0059] In the above technical scheme, multiple first mixers 15 are evenly distributed on the inner wall of the first guide tube 4, which can ensure that the lithium chloride solution and the soda ash solution can be evenly dispersed in the reaction area when flowing into the first guide tube 4 from the first mixer 15, thereby avoiding insufficient or excessive local reaction of the mixed solution in the first guide tube 4, reducing the possibility of impurities entrained on the outside or wrapped inside the lithium carbonate crystals, and improving the purity and crystallization quality of the lithium carbonate.

[0060] In one embodiment, the mixer also includes a second mixer 16, which is arranged in the first guide tube 4, and the distribution pipe 17 also includes a third distribution pipe 173 and a fourth distribution pipe 174, the third distribution pipe 173 is connected to the first feed pipe 2, and the fourth distribution pipe 174 is connected to the second feed pipe 3, the second mixer 16 is connected to the third distribution pipe 173 and the fourth distribution pipe 174, and a mixed liquid outlet 25 is provided on the second mixer 16.

[0061] In the above technical scheme, the second mixer 16 is located inside the first guide tube 4, and premixes the lithium chloride solution and the soda ash solution to ensure that the lithium chloride solution and the soda ash solution reach a sufficient and uniform mixing state before entering the guide tube, thereby improving the reaction efficiency and product quality of lithium precipitation crystallization; the third distribution pipe 173 is connected to the first feed pipe 2, and is used to convey the first material to the second mixer 16, and the fourth distribution pipe 174 is connected to the second feed pipe 3, and is responsible for conveying the second material to the second mixer 16. In the second mixer 16, the first material and the second material contact each other and are fully mixed. When multiple mixers are arranged in the first guide tube 4, the material is evenly flowed into each mixer through the distribution pipe 17, thereby improving the mixing efficiency and quality of the material in the mixer; the mixed liquid outlet 25 is arranged on the second mixer 16, and the premixed mixed liquid flows out of the second mixer 16 from the mixed liquid outlet 25 to reach the reaction area in the first guide tube 4.

[0062] In one embodiment, the third distribution pipe 173 and the fourth distribution pipe 174 are arranged on the first guide tube 4, and the fourth distribution pipe 174 is arranged below the third distribution pipe 173; or, the third distribution pipe 173 is arranged on the first guide tube 4, and the fourth distribution pipe 174 is arranged on the inner side of the third distribution pipe 173.

[0063] In the above technical solution, by arranging the fourth distribution pipe 174 below the third distribution pipe 173, or arranging the fourth distribution pipe 174 on the inner side of the third distribution pipe 173, the lithium chloride solution and the soda ash solution enter the mixing area through different paths under the action of the conveying pressure in the pipeline before entering the reaction area in the first guide tube 4. At the same time, since the density of the lithium chloride solution is relatively large and the density of the soda ash solution is relatively small, the third distribution pipe 173 for conveying the lithium chloride solution is arranged above the fourth distribution pipe 174 for conveying the soda ash solution, so that the lithium chloride solution can utilize gravity and density difference to enhance the convection of the lithium chloride solution and the soda ash solution, thereby improving the mixing efficiency and quality of the lithium chloride solution and the soda ash solution.

[0064] In one embodiment, the third material distribution tube 173 and the fourth material distribution tube 174 are separated by a spacer.

[0065] In the above technical solution, the third distribution pipe 173 is separated from the fourth distribution pipe 174 by a spacer, thereby further ensuring that the lithium chloride solution and the soda ash solution in the third distribution pipe 173 and the fourth distribution pipe 174 will not contact and mix with each other before reaching the mixing position in the mixer.

[0066] In one embodiment, the second mixer 16 includes a third mixing tube 161 and a fourth mixing tube 162. The third mixing tube 161 includes a fifth vertical section 1611, a sixth vertical section 1612 and a third bending section 1613. The fourth mixing tube 162 includes a seventh vertical section 1621, an eighth vertical section 1622 and a fourth bending section 1623. One end of the fifth vertical section 1611 is connected to the third distribution tube 173, and the other end is connected to the sixth vertical section 1612 through the third bending section 1613. The fifth vertical section 1611 extends upward, and the third bending section 1613 extends upward. The sixth vertical segment 1612 extends downward, one end of the seventh vertical segment 1621 is connected to the fourth distribution pipe 174, and the other end is connected to the eighth vertical segment 1622 through the fourth bending segment 1623. The seventh vertical segment 1621 extends downward, the fourth bending segment 1623 bends upward, and the eighth vertical segment 1622 extends upward. One end of the sixth vertical segment 1612 away from the third bending segment 1613 is connected to one end of the eighth vertical segment 1622 away from the fourth bending segment 1623. The sixth vertical segment 1612 is provided with a mixed liquid outlet 25.

[0067] In the above technical solution, the lithium chloride solution in the third distribution pipe 173 flows upward under the guidance of the fifth vertical section 1611, and then the first material enters the third bending section 1613. The third bending section 1613 bends downward, which changes the flow direction of the first material on the one hand and slows down the first material on the other hand. Then the lithium chloride solution enters the sixth vertical section 1612 through the third bending section 1613; the soda ash solution in the second distribution pipe 172 flows downward under the guidance of the seventh vertical section 1621, and then the soda ash solution enters the fourth bending section 1623. The fourth bending section 1623 bends upward, changing the flow direction of the second material, and then the soda ash solution passes through the fourth bending section 1623 and enters the eighth vertical section 1622. The end of the sixth vertical section 1612 away from the third bending section 1613 is connected to the end of the eighth vertical section 1622 away from the fourth bending section 1623, so that the lithium chloride solution and the soda ash solution contact and mix with each other, and premixing is completed in the mixing area at the mixed liquid outlet 25. The premixed mixed liquid flows through the mixed liquid outlet 25 to the reaction area in the first guide tube 4.

[0068] In one embodiment, the diameter of the fourth mixing tube 162 is smaller than the diameter of the third mixing tube 161 , and the diameter ratio of the third mixing tube 161 to the fourth mixing tube 162 is in a range of 1:0.7 to 1:0.5.

[0069] In the above technical solution, the density of the lithium chloride solution is greater than that of the soda ash solution, and it may have a higher viscosity at a higher concentration. The use of the fourth mixing tube 162 with a smaller diameter to transport the soda ash solution can enable the soda ash solution to have a higher flow rate in the fourth mixing tube 162, thereby helping to overcome the influence of density and viscosity and ensure that the soda ash solution can be quickly mixed with the lithium chloride solution after being injected into the third mixing tube 161.

[0070] In one embodiment, the plurality of second mixers 16 are evenly distributed along the circumferential direction on the inner wall of the first guide tube 4 .

[0071] In the above technical scheme, multiple second mixers 16 are evenly distributed on the inner wall of the first guide tube 4, which can ensure that when the lithium chloride solution and the soda ash solution flow from the second mixer 16 into the first guide tube 4, they can be evenly dispersed in the reaction area, thereby avoiding insufficient or excessive local reaction of the mixed solution in the first guide tube 4, reducing the possibility of impurities entrained on the outside or wrapped inside the lithium carbonate crystals, and improving the purity and crystallization quality of the lithium carbonate.

[0072] In one embodiment, the stirring assembly includes a driving device 11, a rotating shaft 12 and a stirring structure. The driving device 11 is arranged on the shell 1, one end of the rotating shaft 12 is drivingly connected to the driving device 11, and the other end extends into the first guide tube 4, and the stirring structure is arranged on the rotating shaft 12.

[0073] In the above technical solution, a driving device 11 such as a motor is used as a power source of the stirring assembly to drive the rotating shaft 12 to rotate. The rotation speed of the stirring structure can be adjusted by precise control of the driving device 11. An appropriate rotation speed can avoid excessive crushing of lithium carbonate crystals or the formation of large agglomerates, thereby improving product quality; the rotating shaft 12 is used to connect the driving device 11 and the stirring structure, and the rotating shaft 12 transmits the rotational motion of the driving device to the stirring structure, so that the stirring structure can rotate in the mixed liquid; the stirring structure is in direct contact with the mixed liquid, and stirs the mixed liquid through its rotational motion, thereby promoting rapid mixing of the lithium chloride solution and the soda ash solution, and further improving the mixing effect of the lithium chloride solution and the soda ash solution.

[0074] In one embodiment, the stirring structure includes a first stirring portion 13 , which is disposed on the rotating shaft 12 , and the first stirring portion 13 stirs the material in the first guide tube 4 to move upward along the first guide tube 4 .

[0075] In the above technical solution, the driving device 11 drives the rotating shaft 12 to rotate, thereby driving the first stirring part 13 to rotate, and the material in the first guide tube 4 is stirred by the first stirring part 13. The first stirring part 13 includes at least one group of upward-turned blades. The mixed liquid in the first guide tube 4 moves upward under the stirring action of the first stirring part 13, so that the mixed liquid can flow from the opening at the upper end of the first guide tube 4 to the material flow area 18.

[0076] In one embodiment, the stirring structure also includes a second stirring part 14, the mixer includes a first mixer 15 and a second mixer 16, the first stirring part 13 is arranged at the discharge position of the first mixer 15, the second stirring part 14 is arranged on the rotating shaft 12, and the second stirring part 14 is arranged at the discharge position of the second mixer 16, and the second stirring part 14 stirs the material in the first guide tube 4 to move upward along the first guide tube 4.

[0077] In the above technical scheme, the second stirring part 14 has the same function as the first stirring part 13, and is also used to stir the material in the first guide tube 4. The second stirring part 14 includes at least one group of upward-turned blades, so that the mixed liquid in the first guide tube 4 moves upward and flows from the opening at the upper end of the first guide tube 4 to the material flow area 18; the first stirring part 13 is set at the discharge position of the first mixer 15, and the second stirring part 14 is set at the discharge position of the second mixer 16, so that the stirring part can directly stir the mixed liquid just discharged from the mixer, further improving the stirring effect of the mixed liquid and improving the uniformity of the mixed liquid. In addition, the mixed liquid in the first guide tube 4 is stirred together by multiple stirring parts, thereby improving the stirring and conveying efficiency of the mixed liquid.

[0078] In one embodiment, the guide tube also includes a second guide tube 9, which is arranged between the first guide tube 4 and the shell 1, and one end of the second guide tube 9 is connected to the shell 1, and a material flow area 18 is formed between the second guide tube 9 and the first guide tube 4, and an overflow area 19 is formed between the second guide tube 9 and the shell 1, and the material flow area 18 and the overflow area 19 are connected at the bottom, and an overflow port 20 is arranged on the shell 1, and the overflow port 20 is connected to the overflow area 19.

[0079] In the above technical scheme, the second guide tube 9 is used to separate the material flow area 18 and the overflow area 19 in the shell 1. The material flow area 18 is the main area for the reaction of the mixed liquid. The lithium carbonate generated by the reaction of the mixed liquid in the material flow area 18 is precipitated to the bottom of the shell 1. The remaining waste liquid after the reaction is completed, the material flow area 18 and the overflow area 19 are connected at the bottom, so that the waste liquid can flow from the material flow area 18 to the overflow area 19. The overflow port 20 is used to discharge the waste liquid in the overflow area 19 from the crystallizer system. Under the action of the pressure difference between the inside and outside of the lithium precipitation crystallizer, the waste liquid in the material flow area 18 flows from the material flow area 18 to the overflow area 19, and then is discharged from the crystallizer through the overflow port 20 from the overflow area 19.

[0080] In one embodiment, the top of the second guide tube 9 is sealed with the shell to prevent the mixed liquid from flowing directly from the top of the second guide tube 9 to the overflow port 20, thereby discharging the lithium precipitation crystallizer system and causing material waste.

[0081] In one embodiment, the overflow port 20 is also provided with a monitoring device, which can monitor the properties of the discharged waste liquid in real time, such as the carbonate concentration and pH value of the waste liquid, so as to adjust the feed ratio and reaction time to ensure the consistency of product quality.

[0082] In one embodiment, an annular plate 21 is disposed in the overflow area 19 , and a water filter 22 is disposed on the annular plate 21 .

[0083] In the above technical scheme, the function of the annular plate 21 is to block the waste liquid in the overflow area 19, increase the residence time of the waste liquid in the overflow area 19, ensure the full sedimentation of the lithium carbonate crystals, reduce the number of lithium carbonate crystals entrained in the overflowing waste liquid, thereby improving the yield of lithium carbonate. In addition, the annular plate 21 can also guide the flow of liquid, ensure the uniform distribution of liquid in the overflow area 19, avoid excessive local flow rate, and affect the overflow and solid-liquid separation effect. The water filter 22 is used to filter the lithium carbonate crystals entrained in the waste liquid, further reduce the number of lithium carbonate crystals entrained in the overflowing waste liquid, thereby improving the yield of lithium carbonate.

[0084] In one embodiment, the plurality of water filters 22 are evenly distributed along the circumference of the annular plate 21 .

[0085] In the above technical solution, the uniform distribution of the water filter 22 ensures that the waste liquid can be evenly discharged from different positions of the crystallizer, which can avoid local clear liquid aggregation or local excessive concentration, thereby improving the overall clear liquid quality and uniformity. In addition, the lithium carbonate crystals filtered out by the water filter 22 may clog the water filter 22. The uniformly distributed water filter 22 can effectively reduce the risk of clogging and improve the reliability of the water filter 22.

[0086] In one embodiment, the lithium precipitation crystallizer system further includes a heating component 24 , and the heating component 24 is disposed on the shell 1 .

[0087] In the above technical solution, the main function of the heating component 24 is to control and maintain the temperature inside the lithium precipitation crystallizer system within an ideal range. Since temperature has a significant effect on the crystallization process of lithium carbonate, especially the solubility of lithium carbonate decreases with increasing temperature, an appropriate temperature is more conducive to the crystallization of lithium carbonate, thereby improving the generation efficiency and crystal quality of lithium carbonate. The heating component 24 can use low-pressure steam or electric heating or heat transfer oil as a heat source to ensure that the temperature in the entire reactor is constant at 90°C to 95°C, which is not only conducive to the generation of lithium carbonate, but also promotes the uniform growth of crystals and reduces the encapsulation or entrainment of impurities in lithium carbonate crystals.

[0088] In one embodiment, the heating component 24 includes a heating pipe, which is arranged around the outer wall of the lithium precipitation crystallizer. A heating medium flows in the heating pipe, and the heating medium includes low-pressure steam or electrically heated thermal oil.

[0089] In the above technical solution, the heat tracing pipe is installed on the outer wall of the lithium crystallizer, and the heating medium flowing through it transfers heat to the reaction liquid inside the crystallizer. The heating process is efficient and uniform, avoiding crystallization problems that may be caused by local overheating or uneven temperature. The heating medium can provide stable and uniform heat energy to ensure that the internal temperature of the lithium crystallizer is maintained within the target range.

[0090] In one embodiment, the lithium precipitation crystallizer system further includes a sewage outlet 23 , and the sewage outlet 23 is arranged at the bottom of the shell 1 .

[0091] In the above technical solution, when the lithium precipitation crystallizer system is cleaned and maintained, the internal liquid is drained through the drain port 23.

[0092] In one embodiment, a first feed port 5 and a second feed port 6 are provided on the first guide tube 4, the first feed pipe 2 is connected to the mixing component through the first feed port 5, the second feed pipe 3 is connected to the mixing component through the second feed port 6, and the first feed port 5 and the second feed port 6 are arranged opposite to each other.

[0093] In the above technical solution, the relatively arranged first feed port 5 and second feed port 6 can ensure that the two reaction materials can be more uniform and stable when entering the distribution pipe 17 through the feed ports, which helps to evenly mix the materials in the mixing component.

[0094] In one embodiment, a third feed port 7 and a fourth feed port 8 are provided on the first guide tube 4, the first feed pipe 2 is connected to the third distribution pipe 173 through the third feed port 7, the second feed pipe 3 is connected to the fourth distribution pipe 174 through the fourth feed port 8, and the first feed port 5 and the second feed port 6 are arranged opposite to each other.

[0095] In the above technical solution, the relatively arranged third feed port 7 and fourth feed port 8 can ensure that the two reaction materials can be more uniform and stable when entering the third distribution pipe 173 and the fourth distribution pipe 174 through the feed ports respectively, which helps to evenly mix the materials in the mixing component.

[0096] In one embodiment, the optional pipeline specifications of the first feed pipe 2 include DN50 and DN65, and the optional pipeline specifications of the second feed pipe 3 include DN50 and DN65.

[0097] In one embodiment, the optional pipeline specifications of the overflow port include DN400.

[0098] In one embodiment, optional pipeline specifications for the water filter 22 include DN80.

[0099] According to an embodiment of the present invention, the lithium precipitation crystallization method includes: adding lithium chloride solution and soda ash solution to a mixing component in a first guide tube; mixing the lithium chloride solution and the soda ash solution in the mixing component and flowing them out into the first guide tube; stirring the mixed solution in the first guide tube, and the mixed solution reacts to obtain lithium carbonate.

[0100] In the above technical scheme, by adding lithium chloride solution and soda ash solution to the mixing assembly arranged in the first guide tube, the premixing of the two materials before entering the first guide tube is achieved. Premixing can make the lithium chloride solution and the soda ash solution more uniform when entering the first guide tube, ensure more complete reaction, reduce material waste, and also help control the local concentration during the reaction process, avoiding incomplete reaction of the mixed solution due to uneven concentration of local reactants, thereby affecting the quality of lithium carbonate crystals; by stirring the mixed solution in the first guide tube, the uniformity of material mixing can be further promoted, so that the mixed material can react fully. The present invention provides a lithium precipitation crystallization method, which significantly improves the mixing effect of the materials by premixing the lithium chloride solution and the soda ash solution in the mixing assembly, thereby effectively solving the problem of insufficient reaction due to uneven material mixing, thereby improving the crystallization quality and production efficiency of lithium carbonate.

[0101] In one embodiment, the step of adding lithium chloride solution and soda ash solution to the mixing component in the first guide tube includes: adding soda ash solution to the lithium precipitation crystallizer system; heating the lithium precipitation crystallizer system; when the liquid level of the soda ash solution in the first guide tube 4 reaches the stirring area where the second stirring part 14 is located, starting the driving device 11; and adding lithium chloride solution and soda ash solution to the mixing component at the same time.

[0102] In the above technical scheme, if a mixture of lithium chloride solution and soda ash solution is directly added to the first guide tube 4, the mixture has reacted to produce lithium carbonate. Before the mixture reaches the stirring area where the second stirring section 14 is located, the second stirring section 14 cannot be used to stir the mixture to suspend the reactants, which causes the reactants to precipitate and solidify at the bottom of the first guide tube 4, causing waste of materials and increasing the difficulty of cleaning. Therefore, the soda ash solution is added first, and the lithium precipitation crystallizer system is heated to ensure that the soda ash solution has reached the ideal reaction temperature before the lithium chloride solution is added. When the soda ash solution reaches the stirring area where the second stirring section 14 is located, the drive device 11 is started to drive the stirring structure to stir the soda ash solution, and then the lithium chloride solution and the soda ash solution are added to the mixing assembly at the same time to ensure that the lithium carbonate produced by the reaction of the mixed solution at this time will not precipitate to the bottom of the first guide tube 4, avoiding the reactants from crystallizing and solidifying at the bottom of the first guide tube 4, thereby reducing material waste and reducing the difficulty of cleaning the first guide tube 4.

[0103] In one embodiment, the concentration of the soda ash solution is adjusted to 300 g / L, and after filtering the impurity particles and colloids in the soda ash solution, the soda ash solution is added into the lithium precipitation crystallizer system.

[0104] In the above technical scheme, when the concentration of the soda ash solution is 300g / L, the mixed solution has sufficient carbonate ions, which helps to speed up the reaction speed and improve the lithium precipitation efficiency, so as to obtain more lithium carbonate crystals in a shorter time. The impurity particles and colloids in the soda ash solution are filtered to ensure the quality of the final lithium carbonate product. If the soda ash solution contains too many impurities, these impurities will combine with the lithium carbonate crystals during the lithium precipitation process, resulting in an increase in the impurity content in the final product, affecting its quality.

[0105] In one embodiment, the step of heating the lithium precipitating crystallizer system includes: heating the lithium precipitating crystallizer system by a heating component, controlling the internal temperature of the lithium precipitating crystallizer to between 90° C. and 95° C., and making the soda ash solution in a boiling state.

[0106] In the above technical solution, controlling the internal temperature of the lithium precipitation crystallizer at 90℃~95℃ can make the mixture of lithium chloride solution and soda ash solution reach suitable reaction conditions, promoting the combination of lithium ions and carbonate ions to form lithium carbonate crystals. At high temperature, the reaction rate is accelerated, which helps to improve the efficiency of lithium precipitation and shorten the reaction time.

[0107] It can be seen from the above description that the above-mentioned embodiments of the present invention achieve the following technical effects: the shell 1 is used to contain the material and provide a closed reaction environment for it to ensure the safety of the reaction process, while preventing material leakage and maintaining the stability of the internal reaction environment; the first feed pipe 2 and the second feed pipe 3 are used to transport the lithium chloride solution and the soda ash solution to the accurate position respectively; the discharge pipe 10 is used to discharge the lithium carbonate crystals after the reaction is completed from the system to avoid the accumulation and blockage of the lithium carbonate crystals in the reactor, which is helpful to achieve the continuous processing and transportation of the lithium carbonate crystals; the mixing component is mainly used to pre-mix the lithium chloride solution and the soda ash solution before entering the reaction area to avoid the lithium chloride solution and the soda ash solution directly entering the crystallizer. The reaction is incomplete due to uneven concentration of local reactants, thereby affecting the quality of the lithium carbonate crystals; the first guide tube 4 is used to guide the mixed material into the reaction area, and cooperate with the stirring component to form a specific flow field in the reaction area, so that the mixed liquid is fully stirred and reacted, thereby improving the production quality and efficiency of the lithium chloride product. The closed bottom design of the first guide tube 4 can ensure that the material entering the guide tube can only flow out through the upper opening, thereby controlling the flow path of the material , and at the same time prevent the lithium carbonate crystals that have settled to the bottom of the crystallizer from being stirred back to the reaction area in the first guide tube 4. The closed bottom design also helps to reduce the circulation of the reaction completed liquid, and prevents the impurities in the mixed liquid after the reaction from entering the reaction area again from the bottom of the first guide tube 4, which affects the reaction process; the design of the opening at the top of the first guide tube 4 can ensure that the mixed liquid flows from the top of the first guide tube 4 to the material flow area 18 under the action of the stirring component, and with the stirring structure, the efficiency of material mixing can be more effectively improved; the role of the stirring component is to stir the mixed liquid in the first guide tube 4 The mixed materials are rotated and stirred to further improve the uniformity of material mixing, so that the mixed materials can fully react in the reaction area. At the same time, the stirring component stirs the mixed materials and drives the mixed materials to flow upward, so that the mixed materials flow from the opening at the top of the first guide tube 4 to the material flow area 18; the lithium precipitation crystallizer system proposed in the present invention pre-mixes the lithium chloride solution and the soda ash solution before entering the reaction area by setting a mixing component, which significantly improves the mixing effect of the materials, thereby effectively solving the problem of insufficient reaction due to uneven material mixing, thereby improving the crystallization quality and production efficiency of lithium carbonate.

[0108] Obviously, the above described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0109] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lithium precipitation crystallizer system, characterized in that: The invention comprises a shell (1), a feed pipe, a guide tube, a discharge pipe (10), a mixing component and a stirring component, wherein the discharge pipe (10) is arranged at the bottom of the shell (1), the guide tube comprises a first guide tube (4), the first guide tube (4) is arranged in the shell (1), the first guide tube (4) is closed at the bottom and open at the top, the feed pipe is connected to the first guide tube (4), the stirring end of the stirring component extends into the first guide tube (4), the feed pipe comprises a first feed pipe (2) and a second feed pipe (3), the mixing component is arranged in the first guide tube (4), a first material flows into the mixing component from the first feed pipe (2), a second material flows into the mixing component from the second feed pipe (3), the first material and the second material are mixed in the mixing component and then flow to the first guide tube (4).

2. The lithium sinking crystallizer system according to claim 1, characterized in that: The mixing assembly comprises a mixer and a distribution pipe (17), wherein the mixer comprises a first mixer (15), wherein the first mixer (15) is arranged in the first flow guide tube (4), wherein the distribution pipe (17) comprises a first distribution pipe (171) and a second distribution pipe (172), wherein the first distribution pipe (171) and the second distribution pipe (172) are arranged along the inner wall of the first flow guide tube (4), wherein the first distribution pipe (171) is connected to the first feed pipe (2), wherein the second distribution pipe (172) is connected to the second feed pipe (3), wherein the first mixer (15) is connected to the first distribution pipe (171) and the second distribution pipe (172), and wherein a mixed liquid outlet (25) is arranged on the first mixer (15).

3. The lithium sinking crystallizer system according to claim 2, characterized in that: The first distribution pipe (171) and the second distribution pipe (172) are arranged on the first flow guide tube (4), and the first distribution pipe (171) is arranged below the second distribution pipe (172); or the first distribution pipe (171) is arranged on the first flow guide tube (4), and the second distribution pipe (172) is arranged on the inner side of the first distribution pipe (171).

4. The lithium sinking crystallizer system according to claim 2, characterized in that: The first mixer (15) comprises a first mixing tube (151) and a second mixing tube (152); the first mixing tube (151) comprises a first vertical section (1511), a second vertical section (1512) and a first bent section (1513); the second mixing tube (152) comprises a third vertical section (1521), a fourth vertical section (1522) and a second bent section (1523); one end of the first vertical section (1511) is connected to the first distribution tube (171), and the other end is connected to the second vertical section (1512) via the first bent section (1513); the first vertical section (1511) extends downward, and the first bent section (1513) extends upward. The second vertical section (1512) is bent upward, one end of the third vertical section (1521) is connected to the second distribution pipe (172), and the other end is connected to the fourth vertical section (1522) through the second bending section (1523), the third vertical section (1521) extends upward, the second bending section (1523) is bent downward, the fourth vertical section (1522) extends downward, one end of the fourth vertical section (1522) away from the second bending section (1523) is connected to one end of the second vertical section (1512) away from the first bending section (1513), and the second vertical section (1512) is provided with a mixed liquid outlet (25).

5. The lithium sinking crystallizer system according to claim 4, characterized in that: The diameter of the first mixing tube (151) is greater than the diameter of the second mixing tube (152), and the diameter ratio of the first mixing tube (151) to the second mixing tube (152) is in the range of 1.2:1 to 1.4:

1.

6. The lithium sinking crystallizer system according to claim 4, characterized in that: A plurality of the first mixers (15) are evenly distributed along the circumferential direction on the inner wall of the first guide tube (4).

7. The lithium sinking crystallizer system according to claim 2, characterized in that: The mixer further comprises a second mixer (16), the second mixer (16) being arranged in the first flow guide tube (4), the distribution pipe (17) further comprising a third distribution pipe (173) and a fourth distribution pipe (174), the third distribution pipe (173) being connected to the first feed pipe (2), the fourth distribution pipe (174) being connected to the second feed pipe (3), the second mixer (16) being connected to the third distribution pipe (173) and the fourth distribution pipe (174), and the second mixer (16) being provided with a mixed liquid outlet (25).

8. The lithium sinking crystallizer system according to claim 7, characterized in that: The third distribution pipe (173) and the fourth distribution pipe (174) are arranged on the first flow guide tube (4), and the fourth distribution pipe (174) is arranged below the third distribution pipe (173); or, the third distribution pipe (173) is arranged on the first flow guide tube (4), and the fourth distribution pipe (174) is arranged on the inner side of the third distribution pipe (173).

9. The lithium sinking crystallizer system according to claim 7, characterized in that: The second mixer (16) comprises a third mixing tube (161) and a fourth mixing tube (162); the third mixing tube (161) comprises a fifth vertical section (1611), a sixth vertical section (1612) and a third bending section (1613); the fourth mixing tube (162) comprises a seventh vertical section (1621), an eighth vertical section (1622) and a fourth bending section (1623); one end of the fifth vertical section (1611) is connected to the third distribution tube (173), and the other end is connected to the sixth vertical section (1612) via the third bending section (1613); the fifth vertical section (1611) extends upward, and the third bending section (1613) extends downward. The sixth vertical section (1612) bends downward, the sixth vertical section (1612) extends downward, one end of the seventh vertical section (1621) is connected to the fourth distribution pipe (174), and the other end is connected to the eighth vertical section (1622) through the fourth bending section (1623), the seventh vertical section (1621) extends downward, the fourth bending section (1623) bends upward, the eighth vertical section (1622) extends upward, one end of the sixth vertical section (1612) away from the third bending section (1613) is connected to one end of the eighth vertical section (1622) away from the fourth bending section (1623), and the sixth vertical section (1612) is provided with a mixed liquid outlet (25).

10. The lithium sinking crystallizer system according to claim 9, characterized in that: The diameter of the third mixing tube (161) is greater than the diameter of the fourth mixing tube (162), and the diameter ratio of the third mixing tube (161) to the fourth mixing tube (162) is in the range of 1:0.7 to 1:0.

5.

11. The lithium sinking crystallizer system according to claim 7, characterized in that: A plurality of the second mixers (16) are evenly distributed along the circumferential direction on the inner wall of the first guide tube (4).

12. The lithium sinking crystallizer system according to claim 1, characterized in that: The stirring assembly comprises a driving device (11), a rotating shaft (12) and a stirring structure; the driving device (11) is arranged on the housing (1); one end of the rotating shaft (12) is drivingly connected to the driving device (11) and the other end extends into the first guide tube (4); and the stirring structure is arranged on the rotating shaft (12).

13. The lithium sinking crystallizer system according to claim 12, characterized in that: The stirring structure comprises a first stirring portion (13), wherein the first stirring portion (13) is arranged on the rotating shaft (12), and the first stirring portion (13) stirs the material in the first flow guide cylinder (4) to move upward along the first flow guide cylinder (4).

14. The lithium sinking crystallizer system according to claim 13, characterized in that: The stirring structure further comprises a second stirring portion (14); the mixer comprises a first mixer (15) and a second mixer (16); the first stirring portion (13) is arranged at a material discharging position of the first mixer (15); the second stirring portion (14) is arranged on the rotating shaft (12); the second stirring portion (14) is arranged at a material discharging position of the second mixer (16); the second stirring portion (14) stirs the material in the first guide tube (4) to move upward along the first guide tube (4).

15. The lithium sinking crystallizer system according to claim 1, characterized in that: The flow guide tube also includes a second flow guide tube (9), which is arranged between the first flow guide tube (4) and the shell (1), one end of the second flow guide tube (9) is connected to the shell (1), a material flow area (18) is formed between the second flow guide tube (9) and the first flow guide tube (4), an overflow area (19) is formed between the second flow guide tube (9) and the shell (1), the material flow area (18) and the overflow area (19) are connected at the bottom, and an overflow port (20) is arranged on the shell (1), and the overflow port (20) is connected to the overflow area (19).

16. The lithium sinking crystallizer system according to claim 15, characterized in that: An annular plate (21) is arranged in the overflow area (19), and a water filter (22) is arranged on the annular plate (21).

17. The lithium sinking crystallizer system according to claim 16, characterized in that: The plurality of water filters (22) are evenly distributed along the circumference of the annular plate (21).

18. The lithium sinking crystallizer system according to claim 1, characterized in that: The lithium precipitation crystallizer system further comprises a heating component (24), and the heating component (24) is arranged on the shell (1).

19. A lithium precipitation crystallization method, characterized in that: The lithium precipitation crystallizer system according to any one of claims 1 to 18 is used to carry out lithium precipitation crystallization, the method comprising: Adding lithium chloride solution and soda ash solution to the mixing component in the first guide tube; mixing the lithium chloride solution and the soda ash solution in the mixing component and flowing out into the first guide tube; The mixed liquid in the first guide tube is stirred, and the mixed liquid reacts to obtain lithium carbonate.

20. The lithium precipitation crystallization method according to claim 19, characterized in that: The step of adding lithium chloride solution and soda ash solution to the mixing assembly in the first draft tube comprises: Adding soda ash solution into the lithium precipitation crystallizer system; Heating lithium precipitation crystallizer system; When the liquid level of the soda ash solution in the first guide tube (4) reaches the stirring area where the second stirring part (14) is located, the driving device (11) is started; Add lithium chloride solution and soda ash solution into the mixing assembly at the same time.

21. The lithium precipitation crystallization method according to claim 19, characterized in that: The concentration of the soda ash solution is adjusted to 300 g / L, and after filtering the impurity particles and colloids in the soda ash solution, the soda ash solution is added to the lithium precipitation crystallizer system.

22. The lithium precipitation crystallization method according to claim 19, characterized in that: The step of heating the lithium precipitating crystallizer system includes: heating the lithium precipitating crystallizer system through a heating component, controlling the internal temperature of the lithium precipitating crystallizer to between 90° C. and 95° C., and making the soda ash solution in a boiling state.

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