Multistage continuous lithium precipitation reaction system for lithium precipitation process in lithium carbonate production and lithium precipitation method

Abstract

The invention relates to the technical field of lithium carbonate production, and provides a lithium carbonate production lithium precipitation process multistage continuous lithium precipitation reaction system and a lithium precipitation method. The lithium precipitation reaction system comprises a finished liquid tank, a primary lithium precipitation kettle, a sodium carbonate kettle and a secondary lithium precipitation kettle; adding the solution in the sodium carbonate kettle into the primary lithium precipitation kettle from the bottom of the primary lithium precipitation kettle to a specified liquid level, and then adding the solution in the liquid tank into the primary lithium precipitation kettle from the top of the primary lithium precipitation kettle; the reaction completion material overflows into a secondary lithium precipitation kettle from an overflow port of the primary lithium precipitation kettle; each of the primary lithium precipitation kettle and the secondary lithium precipitation kettle comprises a shell, a cover body covering the shell, a distributor mounted between the shell and the cover body and a stirring assembly mounted on the cover body; when the solution in the finished solution tank is added into the primary lithium precipitation kettle from the kettle top of the primary lithium precipitation kettle, starting a stirring assembly; the stirring assembly comprises a driving assembly arranged on the cover body, a first stirring assembly driven by the driving assembly and a second stirring assembly driven by the driving assembly.

Description

Technical Field

[0001] The invention relates to the technical field of lithium carbonate production, and in particular to a multi-stage continuous lithium precipitation reaction system and a lithium precipitation method for a lithium carbonate production lithium precipitation process. Background Art

[0002] At present, the lithium carbonate production process widely uses single-stage or multi-stage intermittent reaction technology. Although it is flexible in operation, this inherent batch processing mode is facing severe challenges in the actual application of lithium precipitation reaction. Especially in the context of increasingly fierce market competition, its limitations cannot be ignored. Specifically, since the intermittent lithium precipitation process requires multiple reactors to operate alternately, and discharge and cleaning steps are required after each reaction, the production cycle is extended, the equipment utilization rate is not high, and the production efficiency is low; in addition, the intermittent lithium precipitation process requires frequent manual intervention and monitoring. The low level of automation not only increases labor costs, but also limits the precise control and efficiency optimization of the production process. Summary of the invention

[0003] In view of this, the object of the present invention is to provide a multi-stage continuous lithium precipitation reaction system and lithium precipitation method for the lithium carbonate production lithium precipitation process that can solve or at least alleviate the above-mentioned problems, so as to improve production efficiency, improve the stability of product quality, reduce operation complexity, and reduce labor costs.

[0004] The technical solution provided by the present invention is: a multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process, comprising a finishing liquid tank, a primary lithium precipitation kettle connected to the finishing liquid tank, a sodium carbonate kettle connected to the primary lithium precipitation kettle, and a secondary lithium precipitation kettle connected to the primary lithium precipitation kettle; the solution in the sodium carbonate kettle is added to the primary lithium precipitation kettle from the bottom of the primary lithium precipitation kettle to a specified liquid level, and then the solution in the finishing liquid tank is added to the primary lithium precipitation kettle from the top of the primary lithium precipitation kettle; the overflow port valve of the primary lithium precipitation kettle is opened to adjust the overflow flow and control the liquid level in the primary lithium precipitation kettle to be stable, and the reaction completed material overflows from the overflow port of the primary lithium precipitation kettle into the secondary lithium precipitation kettle; the primary lithium precipitation kettle and the secondary lithium precipitation kettle respectively comprise a shell, a cover body covered on the shell, a distributor installed between the shell and the cover body, and a stirring assembly installed on the cover body; ... solution in the finishing liquid tank is added to the primary lithium precipitation kettle from the top of the primary lithium precipitation kettle; the solution in the finishing liquid tank is added to the primary lithium precipitation kettle from the top of the primary lithium precipitation kettle; the solution in the finishing liquid tank is added to the primary lithium precipitation kettle from the top of the primary lithium precipitation kettle; the solution in the finishing liquid tank is added to the primary lithium precipitation kettle from the top of the primary lithium precipitation kettle; the solution in the finishing liquid tank is added to the primary lithium precipitation kettle from the top of the primary lithium precipitation kettle; the solution in the finishing liquid During the process of adding liquid from the top of the primary lithium precipitation kettle into the primary lithium precipitation kettle, the stirring component is started; the stirring component includes a driving component arranged on the cover body, a first stirring component driven by the driving component, and a second stirring component driven by the driving component; the first stirring component includes a first rotating shaft rotatably mounted on the mounting seat of the driving component, and a first stirring member mounted on the first rotating shaft; the second stirring component includes a first rotating member mounted on the first stirring member and rotating with the rotation of the first rotating shaft, a second rotating shaft sleeved in the first rotating shaft and rotatably mounted on the mounting seat, a connecting seat sleeved on the outer side of the second rotating shaft, a connecting member mounted on the connecting seat, a second stirring member rotatably mounted on the connecting seat, and a second rotating member mounted on the second stirring member and located in the connecting seat.

[0005] In some embodiments, the driving assembly includes a motor mounted on the cover body, a driving member mounted on the output shaft of the motor, the mounting seat mounted on the cover body, and a first follower and a second follower driven by the driving member, wherein the driving member, the first follower and the second follower are accommodated in the mounting seat, and the driving member is located between the first follower and the second follower.

[0006] In some embodiments, the first rotating shaft is a hollow cylinder with openings at both ends, the upper end of the first rotating shaft is rotatably mounted in the mounting opening on the lower side plate of the mounting seat through a bearing, and the first follower is mounted on the first rotating shaft; the first rotating shaft passes downward through the cover body and the distributor and extends into the shell.

[0007] In some embodiments, the first stirring member is installed on the lower end of the first rotating shaft, and includes a first stirring member body, ribs and a scraper plate; the first stirring member body is in a square frame shape, and a plurality of the ribs are provided between the opposite sides of the first stirring member body, and a mounting portion is provided at the center position of the ribs, and the mounting portion is a hollow cylinder with openings at both ends; a connecting portion is provided at the center position of the lower side of the first stirring member body, and the connecting portion is arranged opposite to the mounting portion; a plurality of through openings are provided on the upper side of the first stirring member body; a plurality of the scraper plates are provided on the side of the first stirring member body facing the distributor, and the scraper plates are adjacent to the distributor on the side away from the first stirring member body.

[0008] In some embodiments, one end of the second stirring component is rotatably mounted on the mounting seat, and the other end is rotatably mounted on the connecting portion of the first stirring member body.

[0009] In some embodiments, the first rotating member is mounted on the mounting portion; the upper end of the first rotating member is set as a bevel gear portion, and the lower end of the first rotating member is provided with an annular groove formed by a radial depression along the first rotating member; the upper end of the second rotating shaft is rotatably mounted in the mounting opening on the upper side plate of the mounting seat through a bearing, and the second driven member is mounted on the second rotating shaft, the second rotating shaft passes downward through the mounting portion and the first rotating member mounted on the mounting portion, and extends to the connecting portion, and the lower end of the second rotating shaft is rotatably mounted on the connecting portion through a bearing; the connecting member is mounted on the open end of the connecting seat, and the connecting member is rotatably engaged in the annular groove; mounting holes are respectively provided on both sides of the connecting seat; the second stirring member is rotatably mounted in the mounting hole; the second stirring member includes a square frame and a plurality of connecting ribs arranged on the inner side of the square frame, and a connecting column is provided on a side of the second stirring member adjacent to the first rotating member, the connecting column is rotatably mounted in the mounting hole, and the connecting column extends into the connecting seat; the second rotating member is mounted on one end of the connecting column located in the connecting seat, and the second rotating member is engaged with the bevel gear portion.

[0010] In some embodiments, the shell is a hollow cylinder with one end open, and the cover body is covered on the open end of the shell; a feed port is provided at the bottom of the shell, and the solution in the sodium carbonate kettle enters the primary lithium precipitation kettle from the feed port; a plurality of recessed notches are provided on the side of the cover body facing the shell; the distributor is engaged between the notch and the open end of the shell.

[0011] In some embodiments, the distributor is provided with a liquid inlet pipe and a distribution pipe, the solution in the completion liquid tank enters the distribution pipe from the liquid inlet pipe, and then enters the primary lithium precipitation kettle through the distribution pipe; the liquid inlet pipe is L-shaped, including a first part connected to the distribution pipe, and a second part engaged between the notch and the open end of the shell, the first part and the second part are arranged perpendicular to each other.

[0012] In some embodiments, the distribution tube includes a circular outer tube portion and a plurality of straight tubes arranged on the inner side of the outer tube portion; a plurality of feed holes are opened on the side of the distribution tube facing the bottom of the kettle.

[0013] In addition, the present invention also provides a multi-stage continuous lithium precipitation method for lithium carbonate production lithium precipitation process, which uses the multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process to continuously precipitate lithium, comprising the following steps: S1, subjecting the lithium chloride or lithium sulfate solution in the completion liquid tank and the sodium carbonate solution in the sodium carbonate kettle to temperature adjustment treatment; S2, adding the sodium carbonate solution from the sodium carbonate kettle into the primary lithium precipitation kettle from the bottom of the primary lithium precipitation kettle to a specified liquid level; S3, after step S2, adding the lithium chloride or lithium sulfate solution from the completion liquid tank into the primary lithium precipitation kettle through the distributor, and simultaneously starting the stirring assembly to stir and mix the sodium carbonate solution with the lithium chloride or lithium sulfate solution to obtain lithium carbonate slurry by reaction; S4, opening the overflow valve of the primary lithium precipitator to adjust the overflow flow and control the liquid level in the primary lithium precipitator to be stable, the reaction completed material overflows from the overflow port of the primary lithium precipitator into the secondary lithium precipitator, and at the same time starting the stirring assembly of the secondary lithium precipitator to further react the solution; S5, performing secondary lithium precipitation and aging process in the secondary lithium precipitation kettle; S6, detecting the lithium ion content in the secondary lithium precipitation kettle; S7, discharging the lithium carbonate after aging in the secondary lithium precipitation kettle, and then performing subsequent lithium washing, separation and drying processes.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: 1. The multi-stage continuous lithium precipitation reaction system and lithium precipitation method for lithium carbonate production provided by the present invention can improve production efficiency, improve the stability of product quality, reduce operation complexity, and reduce labor costs.

[0015] 2. The stirring assembly in the present invention allows the two solutions to react quickly in the primary lithium precipitation kettle and can prevent the lithium carbonate slurry generated by the reaction from clogging the feed hole of the distributor.

[0016] 3. In the present invention, when the first rotating shaft rotates along the first direction and the second rotating shaft rotates along the second direction, the first rotating shaft drives the first stirring member to rotate along the first direction, and the second rotating shaft drives the second stirring member and the connecting seat to rotate along the second direction. At the same time, the second stirring member rotates relative to the connecting seat under the action of the first rotating member and the second rotating member, so that the two solutions can be quickly mixed to react quickly to obtain lithium carbonate.

[0017] 4. In the present invention, the scraping plate is adjacent to the distributor on the side away from the first stirring member body, so that the scraping plate can scrape off the lithium carbonate slurry attached to the feed hole to prevent the lithium carbonate slurry from clogging the feed hole.

[0018] 5. The present invention realizes multi-stage continuous reaction by setting up a primary lithium precipitation kettle and a secondary lithium precipitation kettle, realizes rapid reaction in the primary lithium precipitation kettle, maintains reaction and continuous aging in the secondary lithium precipitation kettle. By adopting a continuous process, it can effectively solve the problems existing in the intermittent lithium precipitation process and improve production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process according to an embodiment of the present invention is shown.

[0020] Figure 2 A three-dimensional diagram of a primary lithium precipitation reactor of a multi-stage continuous lithium precipitation reaction system in the lithium precipitation process of lithium carbonate production is shown, in which some components are omitted.

[0021] Figure 3 Shows Figure 2 The exploded view of the primary lithium precipitation kettle is shown.

[0022] Figure 4 Shows Figure 2 An exploded view of some components of a primary lithium precipitation reactor is shown.

[0023] Figure 5 Shows Figure 2 The three-dimensional diagram of the stirring assembly of the primary lithium precipitation kettle is shown, in which some parts are omitted.

[0024] Figure 6 A perspective view of a first agitation assembly of the agitation assembly is shown.

[0025] Figure 7 An exploded view of a second agitation assembly of the agitation assembly is shown.

[0026] Figure 8 Shows Figure 7 An exploded view of some components of the second stirring assembly is shown.

[0027] Description of the reference numerals: 1-finished liquid tank; 2-primary lithium precipitation kettle; 21-shell; 22-cover; 23-distributor; 31-liquid inlet pipe; 32-distributor pipe; 33-feeding hole; 24-stirring assembly; 41-driving assembly; 411-motor; 412-driving member; 413-first driven member; 414-second driven member; 415-mounting seat; 42-first stirring assembly; 421-first rotating shaft; 422-first stirring member; 423-first stirring member body; 4 24-rib; 425-mounting part; 426-scraper; 427-connecting part; 428-opening; 43-second stirring component; 431-second rotating shaft; 432-connecting seat; 321-mounting hole; 433-connecting piece; 434-second stirring piece; 435-first rotating piece; 351-conical tooth part; 352-annular groove; 436-second rotating piece; 3-sodium carbonate kettle; 4-second lithium precipitation kettle; 5-filter; 6-regulating valve; 7-delivery pump; 8-flow meter. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. 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 "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and should not be understood as limitations on the present invention.

[0032] In the present invention, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meanings of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0033] like Figure 1 As shown, the multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process provided by the present invention comprises a finished liquid tank 1, a primary lithium precipitation kettle 2 connected to the finished liquid tank 1 through a first pipeline, a sodium carbonate kettle 3 connected to the primary lithium precipitation kettle 2 through a second pipeline, and a secondary lithium precipitation kettle 4 connected to the primary lithium precipitation kettle 2 through a third pipeline, the finished liquid tank 1 contains lithium chloride or lithium sulfate solution, the sodium carbonate kettle 3 contains sodium carbonate solution, in the multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process, the solutions in the finished liquid tank 1 and the sodium carbonate kettle 3 are both subjected to temperature adjustment treatment, so that the solutions in the finished liquid tank 1 and the sodium carbonate kettle 3 are The temperature of the solution is maintained in the range of 80℃-90℃ respectively; the solution in the sodium carbonate kettle 3 is added to the primary lithium precipitating kettle 2 from the bottom of the primary lithium precipitating kettle 2 to the specified liquid level, and then the solution in the completion tank 1 is added to the primary lithium precipitating kettle 2 from the top of the primary lithium precipitating kettle 2, and the two solutions react in the primary lithium precipitating kettle 2 to obtain lithium carbonate slurry; the overflow port valve of the primary lithium precipitating kettle 2 is opened to adjust the overflow flow and control the liquid level in the primary lithium precipitating kettle 2 to be stable, and the reaction-completed material overflows from the overflow port of the primary lithium precipitating kettle 2 into the secondary lithium precipitating kettle 4 for secondary lithium precipitating and aging process; the reaction is monitored by detecting the lithium ion content in the secondary lithium precipitating kettle 4. The solution in the completion tank 1 enters the primary lithium precipitating kettle 2 through the first pipeline, and the solution in the sodium carbonate kettle 3 enters the primary lithium precipitating kettle 2 through the second pipeline. The first pipeline and the second pipeline are respectively provided with a filter 5, a regulating valve 6, a delivery pump 7 and a flowmeter 8 in the direction of solution flow. The filter 5, the regulating valve 6, the delivery pump 7 and the flow meter 8 can all adopt the existing structures in the prior art, and will not be described in detail here. The third pipeline is connected between the overflow port of the primary lithium precipitating kettle 2 and the kettle top feed port of the secondary lithium precipitating kettle 4. Preferably, the primary lithium precipitating kettle 2 and the secondary lithium precipitating kettle 4 have the same structure, and the primary lithium precipitating kettle 2 is taken as an example for description below.

[0034] Also refer to Figure 2 and Figure 3 The primary lithium precipitation kettle 2 includes a shell 21, a cover 22 covering the shell 21, a distributor 23 installed between the shell 21 and the cover 22, and a stirring assembly 24 installed on the cover 22. The shell 21 is roughly a hollow cylinder with one end open, and the cover 22 is covered on the open end of the shell 21. A feed port is provided at the bottom of the shell 21 (that is, the bottom of the primary lithium precipitation kettle 2), and the solution in the sodium carbonate kettle 3 enters the primary lithium precipitation kettle 2 from the feed port. A plurality of recessed notches are provided on one side of the cover 22 facing the shell 21. The distributor 23 is engaged between the notch and the open end of the shell 21.

[0035] Also refer to Figure 4, the distributor 23 is provided with a liquid inlet pipe 31 and a distribution pipe 32, so that the solution in the liquid tank 1 enters the distribution pipe 32 from the liquid inlet pipe 31, and then enters the primary lithium precipitation kettle 2 through the distribution pipe 32. Preferably, the liquid inlet pipe 31 is roughly L-shaped, including a first part connected to the distribution pipe 32, and a second part connected between the notch and the open end of the shell 21, and the first part and the second part are arranged perpendicular to each other. It is also preferred that four liquid inlet pipes 31 are provided in this embodiment. The distribution pipe 32 includes a roughly circular outer tube portion, and a plurality of straight tubes arranged on the inner side of the outer tube portion. A plurality of feed holes 33 are opened on the side of the distribution pipe 32 facing the bottom of the kettle. Preferably, the feed holes 33 are roughly circular. It is also preferred that the plurality of feed holes 33 are evenly distributed on the distribution pipe 32. More preferably, the diameter of the feed hole 33 is 1.5 mm, which can avoid the risk of blockage caused by the diameter of the feed hole 33 being too small, and ensure a moderate flow rate to achieve the best dispersion effect. The distance between the side of the distributing pipe 32 facing the bottom of the kettle and the bottom of the kettle is 5 / 6 of the height of the shell 21, so as to preliminarily prevent the liquid surface material from splashing onto the distributing device 23 during the stirring process. The solution in the sodium carbonate kettle 3 is added to the primary lithium precipitation kettle 2 from the feed port at the bottom of the kettle of the primary lithium precipitation kettle 2, and then the solution in the liquid tank 1 enters the distributing pipe 32 from the liquid inlet pipe 31, and then enters the primary lithium precipitation kettle 2 through the feed hole 33 on the distributing pipe 32, and the stirring component 24 is started to stir the two solutions to fully mix. The stirring component 24 allows the two solutions to react quickly in the primary lithium precipitation kettle 2, and can prevent the lithium carbonate slurry generated by the reaction from clogging the feed hole 33 of the distributor 23.

[0036] Also refer to Figures 3 to 5 The stirring assembly 24 includes a driving assembly 41 disposed on the cover body 22 , a first stirring assembly 42 driven by the driving assembly 41 , and a second stirring assembly 43 driven by the driving assembly 41 .

[0037] The driving assembly 41 includes a motor 411 mounted on the cover 22, a driving member 412 mounted on the output shaft of the motor 411, a mounting seat 415 mounted on the cover 22, and a first follower 413 and a second follower 414 driven by the driving member 412, wherein the driving member 412, the first follower 413 and the second follower 414 are accommodated in the mounting seat 415, and the driving member 412 is between the first follower 413 and the second follower 414. Preferably, the driving member 412, the first follower 413 and the second follower 414 are bevel gears respectively. The mounting seat 415 is roughly a hollow square body. The upper side plate and the lower side plate of the mounting seat 415 are respectively provided with mounting openings. The motor 411 runs, driving the driving member 412 to rotate, and the driving member 412 drives the first follower member 413 to rotate along a first direction. At the same time, the driving member 412 drives the second follower member 414 to rotate along a second direction opposite to the first direction. The first follower member 413 drives the first stirring component 42 to rotate, and the second follower member 414 drives the second stirring component 43 to rotate.

[0038] Also refer to Figure 6 The first stirring assembly 42 includes a first rotating shaft 421 rotatably mounted on the mounting seat 415, and a first stirring member 422 mounted on the first rotating shaft 421. The first rotating shaft 421 is roughly a hollow cylinder with openings at both ends. The upper end of the first rotating shaft 421 is rotatably mounted in the mounting opening on the lower side plate of the mounting seat 415 through a bearing, and the first follower 413 is mounted on the first rotating shaft 421. The first rotating shaft 421 passes through the cover body 22 and the distributor 23 downward, and extends into the housing 21. The first stirring member 422 is mounted on the lower end of the first rotating shaft 421. The first stirring member 422 includes a first stirring member body 423, ribs 424 and a scraper plate 426. The first stirring member body 423 is roughly in the shape of a square frame. A plurality of ribs 424 are provided between the opposite sides of the first stirring member body 423. A mounting portion 425 is provided at the center of the ribs 424. Preferably, the mounting portion 425 is roughly a hollow cylinder with openings at both ends. A connecting portion 427 is provided at the center position of the lower side of the first stirring member body 423, and the connecting portion 427 is arranged opposite to the mounting portion 425. A plurality of through openings 428 are provided on the upper side of the first stirring member body 423. A plurality of scraping plates 426 are provided on the side of the first stirring member body 423 facing the distributor 23, and the scraping plates 426 are adjacent to the distributor 23 on the side facing away from the first stirring member body 423, so that the scraping plates 426 can scrape off the lithium carbonate slurry attached to the feed hole 33 to prevent the lithium carbonate slurry from clogging the feed hole 33. Preferably, the scraping plates 426 are roughly C-shaped. Also refer to Figure 7 and Figure 8 One end of the second stirring component 43 is rotatably mounted on the mounting seat 415 , and the other end is rotatably mounted on the connecting portion 427 of the first stirring member body 423 .

[0039] The second stirring assembly 43 includes a first rotating member 435, a second rotating shaft 431, a connecting seat 432, a connecting member 433, a second stirring member 434 and a second rotating member 436. The first rotating member 435 is mounted on the mounting portion 425 and rotates with the rotation of the first rotating shaft 421. The first rotating member 435 is roughly a hollow column with two ends open. The upper end of the first rotating member 435 is set as a bevel gear portion 351. The lower end of the first rotating member 435 is provided with an annular groove 352 formed by a radial depression along the first rotating member 435. The second rotating shaft 431 is sleeved in the first rotating shaft 421, and the upper end of the second rotating shaft 431 is rotatably mounted in the mounting opening on the upper side plate of the mounting seat 415 through a bearing, and the second follower 414 is mounted on the second rotating shaft 431. The second rotating shaft 431 passes downward through the mounting portion 425 and the first rotating member 435 mounted on the mounting portion 425, and extends to the connecting portion 427, and the lower end of the second rotating shaft 431 is rotatably mounted on the connecting portion 427 through a bearing. The connecting seat 432 is sleeved on the outer side of the second rotating shaft 431. The connecting seat 432 is roughly a hollow column with an open lower end. The connecting member 433 is mounted on the open end of the connecting seat 432, and the connecting member 433 is rotatably engaged in the annular groove 352 of the first rotating member 435. Preferably, the connecting member 433 is a rotary seal, and the inner side of the connecting member 433 is rotatably engaged in the annular groove 352. The two sides of the connecting seat 432 are respectively provided with mounting holes 321. The second stirring member 434 is rotatably mounted in the mounting hole 321. The second stirring member 434 includes a square frame and a plurality of connecting ribs arranged on the inner side of the square frame. A connecting column is provided on one side of the second stirring member 434 adjacent to the first rotating member 435, and the connecting column is rotatably mounted in the mounting hole 321, and the connecting column extends into the connecting seat 432. A second rotating member 436 is mounted on one end of the connecting column located in the connecting seat 432, and the second rotating member 436 is engaged with the bevel gear portion 351 of the first rotating member 435. Preferably, the second rotating member 436 is a bevel gear. When the first rotating shaft 421 rotates in the first direction and the second rotating shaft 431 rotates in the second direction, the first rotating shaft 421 drives the first stirring member 422 to rotate in the first direction, and the second rotating shaft 431 drives the second stirring member 434 and the connecting seat 432 to rotate in the second direction, and at the same time, the second stirring member 434 rotates relative to the connecting seat 432 under the action of the first rotating member 435 and the second rotating member 436, so that the two solutions can be quickly mixed to react quickly to obtain lithium carbonate.

[0040] The present invention also provides a multi-stage continuous lithium precipitation method for lithium carbonate production lithium precipitation process, which utilizes the multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process to continuously precipitate lithium, comprising the following steps: S1. Temperature adjustment is performed on the lithium chloride or lithium sulfate solution in the finished liquid tank 1 and the sodium carbonate solution in the sodium carbonate kettle 3. Preferably, the temperature of the lithium chloride or lithium sulfate solution in the finished liquid tank 1 and the sodium carbonate solution in the sodium carbonate kettle 3 are maintained in the range of 80°C-90°C, respectively.

[0041] S2, adding the sodium carbonate solution from the sodium carbonate kettle 3 to the primary lithium precipitation kettle 2 from the bottom of the primary lithium precipitation kettle 2 to the specified liquid level. Preferably, the distance between the specified liquid level (i.e., the preset liquid level height) and the bottom of the primary lithium precipitation kettle 2 is 2 / 3 of the height of the shell 21.

[0042] S3. After step S2, the lithium chloride or lithium sulfate solution from the completion liquid tank 1 is added to the primary lithium precipitation kettle 2 through the distributor 23, and the stirring component 24 is started to stir the sodium carbonate solution and the lithium chloride or lithium sulfate solution to fully mix them, and react to obtain lithium carbonate slurry.

[0043] S4, the overflow valve of the primary lithium precipitating kettle 2 is opened to adjust the overflow flow and control the liquid level in the primary lithium precipitating kettle 2 to be stable, and the reaction-completed material overflows from the overflow port of the primary lithium precipitating kettle 2 into the secondary lithium precipitating kettle 4, and the stirring component of the secondary lithium precipitating kettle 4 is started to further make the solution fully react. Preferably, the reaction-completed material enters the secondary lithium precipitating kettle 4 from the overflow port of the primary lithium precipitating kettle 2 through the distributor of the secondary lithium precipitating kettle 4.

[0044] S5, carrying out secondary lithium precipitation and aging process in the secondary lithium precipitation kettle 4.

[0045] S6, detecting the lithium ion content in the secondary lithium precipitation kettle 4.

[0046] S7, discharging the lithium carbonate after aging in the secondary lithium precipitation kettle 4, and then performing subsequent lithium washing, separation and drying processes.

[0047] The multi-stage continuous lithium precipitation method for lithium carbonate production lithium precipitation process provided by the present invention realizes multi-stage continuous reaction by setting a primary lithium precipitation kettle 2 and a secondary lithium precipitation kettle 4, realizes rapid reaction in the primary lithium precipitation kettle 2, maintains reaction and continuous aging in the secondary lithium precipitation kettle 4, and by adopting a continuous process, can effectively solve the problems existing in the intermittent lithium precipitation process, and improve production efficiency and product quality.

[0048] 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 multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process, comprising a finishing liquid tank, a primary lithium precipitation kettle connected to the finishing liquid tank, a sodium carbonate kettle connected to the primary lithium precipitation kettle, and a secondary lithium precipitation kettle connected to the primary lithium precipitation kettle; the solution in the sodium carbonate kettle is added to the primary lithium precipitation kettle from the bottom of the primary lithium precipitation kettle to a specified liquid level, and then the solution in the finishing liquid tank is added to the primary lithium precipitation kettle from the top of the primary lithium precipitation kettle; characterized in that The overflow valve of the primary lithium precipitator is opened to adjust the overflow flow and control the liquid level in the primary lithium precipitator to be stable, and the reaction completed material overflows from the overflow port of the primary lithium precipitator into the secondary lithium precipitator; the primary lithium precipitator and the secondary lithium precipitator respectively include a shell, a cover body covered on the shell, a distributor installed between the shell and the cover body, and a stirring assembly installed on the cover body; during the process of the solution in the completion liquid tank being added to the primary lithium precipitator from the top of the primary lithium precipitator, the stirring assembly is started; the stirring assembly includes a driving assembly arranged on the cover body, a first stirring assembly driven by the driving assembly, and a stirring assembly driven by the driving assembly The second stirring component is driven by a member; the first stirring component includes a first rotating shaft rotatably mounted on the mounting seat of the driving component, and a first stirring member mounted on the first rotating shaft; the second stirring component includes a first rotating member mounted on the first stirring member and rotating with the rotation of the first rotating shaft, a second rotating shaft sleeved in the first rotating shaft and rotatably mounted on the mounting seat, a connecting seat sleeved on the outer side of the second rotating shaft, a connecting member mounted on the connecting seat, a second stirring member rotatably mounted on the connecting seat, and a second rotating member mounted on the second stirring member and located in the connecting seat.

2. The multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process according to claim 1, characterized in that: The driving assembly includes a motor mounted on the cover body, a driving member mounted on the output shaft of the motor, the mounting seat mounted on the cover body, and a first follower and a second follower driven by the driving member, wherein the driving member, the first follower and the second follower are accommodated in the mounting seat, and the driving member is located between the first follower and the second follower.

3. The multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process according to claim 2, characterized in that: The first rotating shaft is a hollow cylinder with openings at both ends. The upper end of the first rotating shaft is rotatably mounted in the mounting opening on the lower side plate of the mounting seat through a bearing, and the first follower is mounted on the first rotating shaft; the first rotating shaft passes downward through the cover body and the distributor and extends into the shell.

4. The multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process according to claim 3, characterized in that: The first stirring member is installed on the lower end of the first rotating shaft, and includes a first stirring member body, ribs and a scraper plate; the first stirring member body is in a square frame shape, and a plurality of the ribs are provided between the opposite sides of the first stirring member body, and a mounting portion is provided at the center position of the ribs, and the mounting portion is a hollow cylinder with openings at both ends; a connecting portion is provided at the center position of the lower side of the first stirring member body, and the connecting portion is arranged opposite to the mounting portion; a plurality of through openings are provided on the upper side of the first stirring member body; a plurality of the scraper plates are provided on the side of the first stirring member body facing the distributor, and the scraper plates are adjacent to the distributor on the side away from the first stirring member body.

5. The multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process according to claim 4, characterized in that: One end of the second stirring component is rotatably mounted on the mounting seat, and the other end is rotatably mounted on the connecting portion of the first stirring member body.

6. The multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process according to claim 5, characterized in that: The first rotating member is mounted on the mounting portion; the upper end of the first rotating member is set as a bevel gear portion, and the lower end of the first rotating member is provided with an annular groove formed by a radial depression of the first rotating member; the upper end of the second rotating shaft is rotatably mounted in the mounting opening on the upper side plate of the mounting seat through a bearing, and the second driven member is mounted on the second rotating shaft, the second rotating shaft passes downward through the mounting portion and the first rotating member mounted on the mounting portion, and extends to the connecting portion, and the lower end of the second rotating shaft is rotatably mounted on the connecting portion through a bearing; the connecting member is mounted on the open end of the connecting seat, and the connecting member is rotatably engaged in the annular groove; mounting holes are respectively provided on both sides of the connecting seat; the second stirring member is rotatably mounted in the mounting hole; the second stirring member includes a square frame and a plurality of connecting ribs arranged on the inner side of the square frame, and a connecting column is provided on a side of the second stirring member adjacent to the first rotating member, the connecting column is rotatably mounted in the mounting hole, and the connecting column extends into the connecting seat; the second rotating member is mounted on one end of the connecting column located in the connecting seat, and the second rotating member is engaged with the bevel gear portion.

7. The multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process according to claim 1, characterized in that: The shell is a hollow cylinder with one end open, and the cover body is covered on the open end of the shell; a feed port is provided at the bottom of the shell, and the solution in the sodium carbonate kettle enters the primary lithium precipitation kettle from the feed port; a plurality of recessed notches are provided on the side of the cover body facing the shell; the distributor is engaged between the notches and the open end of the shell.

8. The multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process according to claim 7, characterized in that: The distributor is provided with a liquid inlet pipe and a material distribution pipe, and the solution in the finished liquid tank enters the material distribution pipe from the liquid inlet pipe, and then enters the primary lithium precipitation kettle through the material distribution pipe; The liquid inlet pipe is L-shaped, and comprises a first portion communicating with the material distribution pipe, and a second portion engaged between the notch and the open end of the shell, wherein the first portion and the second portion are arranged perpendicular to each other.

9. The multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process according to claim 8, characterized in that: The material distribution pipe comprises a circular outer pipe portion and a plurality of straight pipes arranged on the inner side of the outer pipe portion; a plurality of material feed holes are provided on a side of the material distribution pipe facing the bottom of the kettle.

10. A multi-stage continuous lithium precipitation method for lithium carbonate production lithium precipitation process, characterized in that: Continuous lithium precipitation is carried out using the multi-stage continuous lithium precipitation reaction system for lithium carbonate production lithium precipitation process according to any one of claims 1 to 9, comprising the following steps: S1, subjecting the lithium chloride or lithium sulfate solution in the completion liquid tank and the sodium carbonate solution in the sodium carbonate kettle to temperature adjustment treatment; S2, adding the sodium carbonate solution from the sodium carbonate kettle into the primary lithium precipitation kettle from the bottom of the primary lithium precipitation kettle to a specified liquid level; S3, after step S2, adding the lithium chloride or lithium sulfate solution from the completion liquid tank into the primary lithium precipitation kettle through the distributor, and simultaneously starting the stirring assembly to stir and mix the sodium carbonate solution with the lithium chloride or lithium sulfate solution to obtain lithium carbonate slurry by reaction; S4, opening the overflow valve of the primary lithium precipitator to adjust the overflow flow and control the liquid level in the primary lithium precipitator to be stable, the reaction completed material overflows from the overflow port of the primary lithium precipitator into the secondary lithium precipitator, and at the same time starting the stirring assembly of the secondary lithium precipitator to further react the solution; S5, performing secondary lithium precipitation and aging process in the secondary lithium precipitation kettle; S6, detecting the lithium ion content in the secondary lithium precipitation kettle; S7, discharging the lithium carbonate after aging in the secondary lithium precipitation kettle, and then performing subsequent lithium washing, separation and drying processes.

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