Lithium precipitation reaction device and application method

Abstract

The invention relates to the technical field of lithium carbonate precipitation equipment, in particular to a lithium precipitation reaction device and an application method. The device comprises a lithium precipitation reaction kettle, a stirring part, a flow blocking assembly and a fluid shearing part, a lithium-rich liquid feeding pipe, an alkali liquid feeding pipe, a discharging pipe and a material returning pipe which are communicated with the interior of the lithium precipitation reaction kettle are arranged on the lithium precipitation reaction kettle; the stirring part is arranged on the lithium precipitation reaction kettle, and the stirring end of the stirring part is arranged in the lithium precipitation reaction kettle; the flow blocking assembly is arranged in the lithium precipitation reaction kettle; and the fluid shearing component is arranged at the bottom or outside the lithium precipitation reaction kettle. The application method of the device not only can promote collision aggregation and sedimentation among lithium carbonate particles in the lithium sedimentation process, but also can effectively solve the problem of high impurity content of lithium carbonate, so that the product quality is improved, and the lithium sedimentation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium carbonate precipitation equipment, and in particular to a lithium precipitation reaction device and an application method thereof. Background Art

[0002] Currently, the lithium carbonate precipitation process mostly uses the traditional lithium precipitation kettle stirring method. This stirring method mostly uses paddle stirring in the kettle body, which often has low dispersion efficiency. As a result, the probability of lithium-rich solution and alkali solution reacting and colliding during the precipitation process is reduced, which leads to a decrease in the probability of lithium carbonate particles agglomerating and settling. This in turn leads to reduced lithium precipitation efficiency and long production cycles. In addition, the stirred lithium carbonate solution rotates in a single direction, which easily causes sodium carbonate microcrystals and / or sodium chloride microcrystals to be trapped between lithium carbonate crystal particles, resulting in high impurity content and making it difficult to achieve high-quality lithium carbonate standards.

[0003] In summary, it is necessary to develop a lithium precipitation reaction device and application method to solve the problems of lithium carbonate solution in the prior art, such as low lithium precipitation efficiency and high impurity content due to the single stirring method and low dispersion efficiency. Summary of the Invention

[0004] The present invention aims to provide a lithium precipitation reaction device and an application method, and the specific technical solutions are as follows: In a first aspect, the present invention provides a lithium precipitation reaction device, comprising a lithium precipitation reactor, a stirring component, a flow blocking component and a fluid shearing component; A lithium-rich liquid feed pipe, an alkaline liquid feed pipe, a discharge pipe and a return pipe are provided on the lithium precipitation reactor, which are connected to the lithium precipitation reactor; one end of the discharge pipe is a feed end, which is connected to the bottom of the lithium precipitation reactor, and the other end includes a first openable and closable discharge end and a second openable and closable discharge end in parallel, the first openable and closable discharge end is connected to the return pipe; an end of the return pipe away from the first openable and closable discharge end is connected to the top of the lithium precipitation reactor; the second openable and closable discharge end is connected to a collector; The stirring component is arranged on the lithium precipitation reactor, and the stirring end thereof is arranged in the lithium precipitation reactor; The baffle assembly is arranged in the lithium sinking reactor, and includes a plurality of baffles; each of the baffles is arranged at intervals on the annular inner wall of the lithium sinking reactor, and the length direction of each baffle is the same as the axial direction of the lithium sinking reactor; The fluid shearing component is arranged at the bottom of the lithium precipitation reactor, and its shearing end is arranged inside the lithium precipitation reactor; or, the fluid shearing component is arranged outside the lithium precipitation reactor, and its feed port is connected to the first openable and closable discharge end, and its discharge port is connected to the return pipe.

[0005] Optionally, the fluid shearing component includes a high shear mixer provided with a stator and rotor; the high shear mixer includes any one of a continuous high shear mixer and an intermittent high shear mixer; the high shear mixer is arranged at the bottom of the lithium precipitation reactor.

[0006] Optionally, the fluid shearing component includes a high shear mixer provided with a stator and rotor; the high shear mixer includes a continuous high shear mixer, which is arranged outside the lithium precipitation reactor, and its feed port is connected to the first openable and closable discharge end, and its discharge port is connected to the return pipe.

[0007] Optionally, the stirring component, the flow blocking component and the fluid shearing component can generate a shear flow field for the reaction liquid formed by mixing the lithium-rich liquid and the alkaline solution.

[0008] Optionally, the baffle assembly further includes a plurality of baffle seats; each of the baffle plates is connected to the inner wall of the lithium precipitation reactor via the baffle seat.

[0009] Optionally, the stirring component includes any one of a folding blade stirrer, a paddle stirrer, an anchor stirrer, a frame stirrer, a propeller stirrer and a pitch blade stirrer.

[0010] Optionally, the lithium precipitation reaction device also includes a heating component; the heating component includes a steam jacket arranged outside the lithium precipitation reactor and a steam inlet and a condensed water outlet arranged on the steam jacket; solenoid valves are provided on both the steam inlet and the condensed water outlet.

[0011] Optionally, the lithium precipitation reaction device further includes a flow meter; the flow meter is provided on both the lithium-rich solution feed pipe and the alkali solution feed pipe; It also includes a thermometer; a first mounting hole for mounting the thermometer is provided on the lithium precipitation reactor; It also includes a liquid level sensor; a second mounting hole for mounting the liquid level sensor is provided on the lithium precipitation reactor; Solenoid valves are provided on both the first openable and closable discharge end and the second openable and closable discharge end; Solenoid valves are provided on both the lithium-rich solution feed pipe and the alkali solution feed pipe; A spiral nozzle is provided at the outlet of the lithium-rich liquid feeding pipe.

[0012] Optionally, the lithium precipitation reaction device further includes a cleaning assembly; the cleaning assembly includes an online CIP cleaning system and a flushing water pipe; a third mounting hole for mounting the flushing water pipe is provided on the lithium precipitation reactor; one end of the flushing water pipe is connected to the online CIP cleaning system, and the other end is connected to the lithium precipitation reactor through the third mounting hole; A solenoid valve is provided on the flushing water pipe; A spiral nozzle is arranged at the outlet of the flushing water pipe.

[0013] Optionally, the lithium precipitation reaction device also includes a DCS control system; the stirring component, the fluid shear component, each of the solenoid valves, each of the flow meters, the thermometer, the liquid level sensor and the online CIP cleaning system are all connected to the DCS control system.

[0014] In a second aspect, the present invention provides an application method of the lithium precipitation reaction device, which comprises: Step S1: Use the DCS control system to open the solenoid valve on the alkali solution feed pipe and control the alkali solution flow rate to 5~30m 3 / h, when the alkali solution is fed to 7% to 45% of the internal volume of the lithium precipitation reactor, the solenoid valve on the alkali solution feeding pipe is closed; during the process of adding the alkali solution, the DCS control system is used to start the stirring component to stir the alkali solution, and the heating component is started to heat the alkali solution until it is heated to 65-90°C; Step S2: Use the DCS control system to open the solenoid valve on the lithium-rich liquid feed pipe and control the flow rate of the lithium-rich liquid to 2-25m 3 / h, when the lithium-rich solution is fed to 0.5~3 times the volume of the alkali solution feed and not higher than 80% of the internal volume of the lithium precipitation reactor, the solenoid valve on the lithium-rich solution feed pipe is closed; in the process of adding the lithium-rich solution, the DCS control system is used to continuously start the stirring component to stir so that the alkali solution and the lithium-rich solution are mixed in the lithium precipitation reactor to form a reaction solution; when the lithium-rich solution feed volume is half of the total lithium-rich solution feed volume, the DCS control system is used to start the fluid shearing component to shear the circulating reaction solution, and the stirring component is continuously started to stir the reaction solution, and the heating component is continuously started to heat the reaction solution to a reaction temperature of 80~95°C; after all the lithium solution is fed, the continuous circulation reaction time of the shearing circulating reaction solution is 0.5~2h; the shear rate of the fluid shearing component is 3000~15000rpm; Step S3, using the DCS control system to close the heating component and the fluid shearing component, open the solenoid valve on the second openable and closable discharge end, and discharge and collect the reaction liquid after lithium precipitation; when the liquid level sensor detects that the liquid level in the lithium precipitation reactor is lower than the stirring component, use the DCS control system to close the stirring component; when the liquid level sensor detects that the liquid level in the lithium precipitation reactor is zero, use the DCS control system to start the cleaning component to clean the lithium precipitation reactor.

[0015] Optionally, the lithium-rich solution includes any one of lithium sulfate and lithium hydrochloride; the mass concentration of lithium in the lithium-rich solution is 15~30g / L; the alkali solution includes sodium carbonate solution; the mass percentage of sodium carbonate in the sodium carbonate solution is 10%~32.8%.

[0016] The application of the technical solution of the present invention has at least the following beneficial effects: (1) The present invention provides a lithium precipitation reaction device, which combines a stirring component, a flow baffle component and a fluid shear component to generate a strong shear flow field on the reaction liquid formed by the mixture of lithium-rich liquid and alkaline solution, which can not only promote the collision, aggregation and sedimentation of lithium carbonate particles during the lithium precipitation process, but also avoid the inclusion of sodium carbonate microcrystals and / or sodium chloride microcrystals between lithium carbonate crystal particles, thereby improving the lithium precipitation efficiency and lithium carbonate quality. Specifically, the present invention adopts a stirring component not only to mix the lithium-rich liquid and the alkaline solution to form a reaction liquid, but also can use the baffle effect of the baffle component to block the reaction liquid in the lithium precipitation reactor, thereby allowing the reaction liquid to flow in multiple directions under the combined action of the stirring component and the baffle component in the lithium precipitation reactor, thereby achieving large mixing, solving the problem of the reaction liquid rotating in a single direction due to the single use of the stirring component, and reducing the wrapping of sodium carbonate microcrystals and / or sodium chloride microcrystals between lithium carbonate crystal particles; further, the present invention also adopts a fluid shearing component to generate a strong shear flow field for the reaction liquid, which can not only promote the collision, aggregation and sedimentation of lithium carbonate particles in the lithium precipitation process, but also avoid the wrapping of sodium carbonate microcrystals and / or sodium chloride microcrystals between lithium carbonate crystal particles, thereby improving the lithium precipitation efficiency and lithium carbonate quality.

[0017] (2) The present invention provides an application method of a lithium precipitation reaction device, which can achieve complete lithium precipitation reaction and improve lithium precipitation efficiency by controlling the liquid level, alkaline solution flow rate, lithium-rich solution flow rate, reaction temperature and shear rate; wherein, controlling the shear rate can also achieve a homogenization effect of the reaction liquid, thereby promoting the complete lithium precipitation reaction; controlling the shear rate can also achieve the refinement of lithium carbonate particles, thereby avoiding the inclusion of sodium carbonate microcrystals and / or sodium chloride microcrystals between lithium carbonate crystal particles; a DCS control system and an online CIP cleaning system are used to realize the automation of lithium precipitation reaction.

[0018] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic structural diagram of a lithium precipitation reaction device in Example 1; Figure 2 This is a schematic structural diagram of a lithium precipitation reaction device in Example 2; Among them, 1. lithium precipitation reactor, 1.1. first mounting hole, 2. stirring component, 3. baffle assembly, 3.1. baffle plate, 3.2. baffle seat, 4. fluid shear component, 5. lithium-rich liquid feed pipe, 6. alkali liquid feed pipe, 7. discharge pipe, 7.1. first openable and closable discharge end, 7.2. second openable and closable discharge end, 8. return pipe, 9. heating component, 9.1. steam jacket, 9.2. steam inlet, 9.3. condensate outlet, 10. liquid level sensor, 11. flushing water pipe. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0021] Example 1: See also Figure 1 A lithium precipitation reaction device includes a lithium precipitation reactor 1, a stirring component 2 (such as a folding blade stirrer), a flow blocking component 3 and a fluid shearing component 4; A lithium-rich liquid feed pipe 5, an alkaline liquid feed pipe 6, a discharge pipe 7 and a return pipe 8 are provided on the lithium precipitation reactor 1, which are connected to the lithium precipitation reactor 1; one end of the discharge pipe 7 is a feed end, which is connected to the bottom of the lithium precipitation reactor 1, and the other end includes a first openable and closable discharge end 7.1 and a second openable and closable discharge end 7.2 in parallel, the first openable and closable discharge end 7.1 is connected to the return pipe 8; the end of the return pipe 8 away from the first openable and closable discharge end 7.1 is connected to the top of the lithium precipitation reactor 1; the second openable and closable discharge end 7.2 is connected to a collector; The stirring component 2 is arranged on the lithium precipitation reactor 1, and the stirring end thereof is arranged inside the lithium precipitation reactor 1; The baffle assembly 3 is arranged in the lithium sinking reactor 1, and includes a plurality of baffles 3.1; each of the baffles 3.1 is arranged at intervals on the annular inner wall of the lithium sinking reactor 1, and the length direction of each baffle 3.1 is the same as the axial direction of the lithium sinking reactor 1; The fluid shearing component 4 is arranged outside the lithium precipitation reactor 1, and its feed port is connected to the first openable and closable discharge end 7.1, and its discharge port is connected to the return pipe 8.

[0022] The fluid shear component 4 is a continuous high shear mixer (see the existing literature (Zhang Ziqiang. Research on high shear mixer-driven nanoparticle deaggregation and dispersion in viscous system and its process intensification [D]. Zhejiang University, 2023.) Pages 2 to 4 of the text, Section 1.2.2 Basic Classification of High Shear Mixers); the continuous high shear mixer is arranged outside the lithium precipitation reactor 1, and its feed port is connected to the first openable and closable discharge end 7.1, and its discharge port is connected to the return pipe 8.

[0023] The stirring component 2, the flow blocking component 3 and the fluid shearing component 4 can generate a shear flow field for the reaction liquid formed by the mixture of the lithium-rich liquid and the alkaline solution.

[0024] The baffle assembly 3 also includes multiple baffle seats 3.2; both ends of each baffle plate 3.1 are connected to the inner wall of the lithium precipitation reactor 1 through two baffle seats 3.2, so that a gap is formed between the baffle plate 3.1 and the inner wall of the lithium precipitation reactor 1, which facilitates the reaction liquid to flow in multiple directions in the lithium precipitation reactor 1 under the combined action of the stirring component 2 and the baffle assembly 3, achieving large mixing, solving the problem of the reaction liquid rotating in a single direction due to the single use of the stirring component 2, and reducing the occurrence of lithium carbonate particles being wrapped by impurities.

[0025] The lithium precipitation reaction device also includes a heating component 9; the heating component 9 includes a steam jacket 9.1 arranged outside the lithium precipitation reactor 1 and a steam inlet 9.2 and a condensed water outlet 9.3 arranged on the steam jacket 9.1; solenoid valves are provided on the steam inlet 9.2 and the condensed water outlet 9.3; the steam inlet 9.2 can be arranged at the top of the steam jacket 9.1 and connected to the steam source to facilitate sufficient heating of the steam jacket 9.1; the condensed water outlet 9.3 can be arranged at the bottom of the steam jacket 9.1 to facilitate the discharge of liquid after steam condensation.

[0026] The lithium precipitation reaction device further includes a flow meter; the flow meter is provided on both the lithium-rich solution feed pipe 5 and the alkaline solution feed pipe 6.

[0027] The lithium precipitation reaction device further includes a thermometer; a first mounting hole 1.1 for mounting the thermometer is provided on the lithium precipitation reaction kettle 1.

[0028] The lithium precipitation reaction device further includes a liquid level sensor 10 ; a second mounting hole for mounting the liquid level sensor 10 is provided on the lithium precipitation reaction kettle 1 .

[0029] Solenoid valves are provided on both the first openable and closable discharge end 7.1 and the second openable and closable discharge end 7.2.

[0030] Solenoid valves are provided on both the lithium-rich solution feed pipe 5 and the alkaline solution feed pipe 6 .

[0031] A spiral nozzle is provided at the outlet of the lithium-rich solution feeding pipe 5 to facilitate spiral feeding and enhance the mixing uniformity of the alkali solution and the lithium-rich solution.

[0032] The lithium precipitation reaction device also includes a cleaning assembly; the cleaning assembly includes an online CIP cleaning system (existing technology and not shown in the figure) and a flushing water pipe 11; a third mounting hole for mounting the flushing water pipe 11 is provided on the lithium precipitation reactor 1; one end of the flushing water pipe 11 is connected to the online CIP cleaning system, and the other end is connected to the lithium precipitation reactor 1 through the third mounting hole; A solenoid valve is provided on the flushing water pipe 11; A spiral nozzle is provided at the outlet of the flushing water pipe 11 to facilitate spiral feeding, thereby enhancing the overall flushing effect on the lithium precipitation reactor 1 and ensuring thorough flushing.

[0033] The lithium precipitation reaction device also includes a DCS control system (existing technology, and not shown in the figure); the stirring component 2, the fluid shear component 4, each of the solenoid valves, each of the flow meters, the thermometer, the liquid level sensor 10 and the online CIP cleaning system are all connected to the DCS control system.

[0034] The application method of the lithium precipitation reaction device comprises: Step S1: Use the DCS control system to open the solenoid valve on the alkali solution feeding pipe 6 and control the alkali solution flow rate to 5~30m 3 / h (specifically 10m 3 / h), when the alkali solution is fed to 7% to 45% (specifically 28%) of the internal volume of the lithium precipitation reactor 1, the solenoid valve on the alkali solution feeding pipe 6 is closed; during the process of adding the alkali solution, the DCS control system is used to start the stirring component 2 to stir the alkali solution, and the heating component 9 is started to heat the alkali solution until it is heated to 65 to 90°C (specifically 85°C); Step S2: Use the DCS control system to open the solenoid valve on the lithium-rich liquid feed pipe 5 and control the flow rate of the lithium-rich liquid to 2-25m 3 / h (specifically 3m 3 / h), when the lithium-rich solution is fed to 0.5~3 times (specifically 1.6 times) the volume of the alkali solution feed and not more than 80% of the internal volume of the lithium precipitation reactor 1, the solenoid valve on the lithium-rich solution feed pipe 5 is closed; in the process of adding the lithium-rich solution, the DCS control system is used to continuously start the stirring component 2 to stir so that the alkali solution and the lithium-rich solution are mixed in the lithium precipitation reactor 1 to form a reaction solution; when the lithium-rich solution feed volume is half of the total lithium-rich solution feed volume, the DCS control system is used to start the fluid shearing component 4 to shear the circulating reaction solution, and the stirring component 2 is continuously started to stir the reaction solution, and the heating component 9 is continuously started to heat the reaction solution to a reaction temperature of 80~95°C (specifically 85°C); after all the lithium solution is fed, the continuous circulation reaction time of the shearing circulating reaction solution is 0.5~2h (specifically 1h); the shear rate of the fluid shearing component 4 is 3000~15000rpm (specifically 6000rpm); Step S3, using the DCS control system to close the heating component 9 and the fluid shear component 4, open the solenoid valve on the second openable and closable discharge end 7.2, and discharge and collect the reaction liquid after lithium precipitation; when the liquid level sensor 10 detects that the liquid level in the lithium precipitation reactor 1 is lower than the stirring component 2, the DCS control system is used to close the stirring component 2; when the liquid level sensor 10 detects that the liquid level in the lithium precipitation reactor 1 is zero, the DCS control system is used to start the cleaning component to clean the lithium precipitation reactor 1.

[0035] The lithium-rich solution is lithium sulfate; the mass concentration of lithium in the lithium-rich solution is 25 g / L; the alkali solution includes a sodium carbonate solution; the mass percentage of sodium carbonate in the sodium carbonate solution is 30%.

[0036] Example 2: See also Figure 2 , different from Example 1, in the lithium precipitation reaction device, the fluid shearing component 4 is arranged at the bottom of the lithium precipitation reactor 1, and its shearing end is arranged inside the lithium precipitation reactor 1; the fluid shearing component 4 is an intermittent high shear mixer (see the existing literature (Zhang Ziqiang. Research on high shear mixer-driven nanoparticle deaggregation and dispersion in viscous system and its process intensification [D]. Zhejiang University, 2023.) Pages 2 to 4 of the text, Section 1.2.2 Basic Classification of High Shear Mixers); the intermittent high shear mixer is arranged at the bottom of the lithium precipitation reactor 1, and its shearing end is arranged inside the lithium precipitation reactor 1.

[0037] The lithium precipitation reaction devices of Examples 1 and 2 used in the present invention can generate a strong shear flow field on the reaction liquid formed by the mixture of lithium-rich liquid and alkaline solution, which can not only promote the collision, aggregation and sedimentation of lithium carbonate particles during the lithium precipitation process, but also avoid the wrapping of sodium carbonate microcrystals and / or sodium chloride microcrystals between lithium carbonate crystal particles, thereby improving the lithium precipitation efficiency and lithium carbonate quality.

[0038] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A lithium precipitation reaction device, characterized in that: It comprises a lithium precipitation reactor (1), a stirring component (2), a flow blocking component (3) and a fluid shearing component (4); A lithium-rich liquid feed pipe (5), an alkaline liquid feed pipe (6), a discharge pipe (7) and a return pipe (8) are provided on the lithium precipitation reactor (1) and are connected to the lithium precipitation reactor (1); one end of the discharge pipe (7) is a feed end, which is connected to the bottom of the lithium precipitation reactor (1), and the other end includes a first openable and closable discharge end (7.1) and a second openable and closable discharge end (7.2) in parallel, and the first openable and closable discharge end (7.1) is connected to the return pipe (8); an end of the return pipe (8) away from the first openable and closable discharge end (7.1) is connected to the top of the lithium precipitation reactor (1); the second openable and closable discharge end (7.2) is connected to a collector; The stirring component (2) is arranged on the lithium precipitation reactor (1), and the stirring end thereof is arranged inside the lithium precipitation reactor (1); The baffle assembly (3) is arranged in the lithium precipitation reactor (1), and comprises a plurality of baffles (3.1); the baffles (3.1) are arranged at intervals on the annular inner wall of the lithium precipitation reactor (1), and the length direction of each baffle (3.1) is the same as the axial direction of the lithium precipitation reactor (1); The fluid shearing component (4) is arranged at the bottom of the lithium precipitation reactor (1), and its shearing end is arranged inside the lithium precipitation reactor (1); or, the fluid shearing component (4) is arranged outside the lithium precipitation reactor (1), and its feed port is connected to the first openable and closable discharge end (7.1), and its discharge port is connected to the return pipe (8).

2. The lithium precipitation reaction device according to claim 1, characterized in that: The fluid shearing component (4) includes a high shear mixer provided with a stator and rotor; the high shear mixer includes any one of a continuous high shear mixer and an intermittent high shear mixer; the high shear mixer is arranged at the bottom of the lithium precipitation reactor (1).

3. The lithium precipitation reaction device according to claim 1, characterized in that: The fluid shearing component (4) includes a high shear mixer provided with a stator and rotor; the high shear mixer includes a continuous high shear mixer, which is arranged outside the lithium precipitation reactor (1), and its feed port is connected to the first openable and closable discharge end (7.1), and its discharge port is connected to the return pipe (8).

4. The lithium precipitation reaction device according to claim 2 or 3, characterized in that: The stirring component (2), the flow blocking component (3) and the fluid shearing component (4) can generate a shear flow field for the reaction liquid formed by mixing the lithium-rich liquid and the alkaline solution; The baffle assembly (3) further comprises a plurality of baffle seats (3.2); each baffle plate (3.1) is connected to the inner wall of the lithium precipitation reactor (1) via the baffle seat (3.2); The stirring component (2) includes any one of a folding blade stirrer, a paddle stirrer, an anchor stirrer, a frame stirrer, a propeller stirrer and a pitched blade stirrer.

5. The lithium precipitation reaction device according to claim 4, characterized in that: It also includes a heating component (9); the heating component (9) includes a steam jacket (9.1) arranged outside the lithium precipitation reactor (1) and a steam inlet (9.2) and a condensed water outlet (9.3) arranged on the steam jacket (9.1); solenoid valves are provided on both the steam inlet (9.2) and the condensed water outlet (9.3).

6. The lithium precipitation reaction device according to claim 5, characterized in that: It also includes a flow meter; the flow meter is provided on both the lithium-rich solution feed pipe (5) and the alkali solution feed pipe (6); It also includes a thermometer; a first mounting hole (1.1) for mounting the thermometer is provided on the lithium precipitation reactor (1); It also includes a liquid level sensor (10); a second mounting hole for mounting the liquid level sensor (10) is provided on the lithium precipitation reactor (1); Solenoid valves are provided on both the first openable and closable discharge end (7.1) and the second openable and closable discharge end (7.2); Solenoid valves are provided on both the lithium-rich solution feed pipe (5) and the alkali solution feed pipe (6); A spiral nozzle is provided at the outlet of the lithium-rich liquid feed pipe (5).

7. The lithium precipitation reaction device according to claim 6, characterized in that: It also includes a cleaning component; the cleaning component includes an online CIP cleaning system and a flushing water pipe (11); a third mounting hole for mounting the flushing water pipe (11) is provided on the lithium precipitation reactor (1); one end of the flushing water pipe (11) is connected to the online CIP cleaning system, and the other end is connected to the inside of the lithium precipitation reactor (1) through the third mounting hole; A solenoid valve is provided on the flushing water pipe (11); A spiral nozzle is provided at the outlet of the flushing water pipe (11).

8. The lithium precipitation reaction device according to claim 7, characterized in that: It also includes a DCS control system; the stirring component (2), the fluid shearing component (4), each of the solenoid valves, each of the flow meters, the thermometer, the liquid level sensor (10) and the online CIP cleaning system are all connected to the DCS control system.

9. An application method of the lithium precipitation reaction device according to claim 8, characterized in that: include: Step S1: Use the DCS control system to open the solenoid valve on the alkali solution feeding pipe (6) and control the alkali solution flow rate to 5~30m 3 / h, when the alkali solution is fed to 7% to 45% of the internal volume of the lithium precipitation reactor (1), the solenoid valve on the alkali solution feeding pipe (6) is closed; during the process of adding the alkali solution, the DCS control system is used to start the stirring component (2) to stir the alkali solution, and the heating component (9) is started to heat the alkali solution until it is heated to 65 to 90°C; Step S2: Use the DCS control system to open the solenoid valve on the lithium-rich liquid feed pipe (5) and control the flow rate of the lithium-rich liquid to 2-25m 3 / h, when the lithium-rich liquid is fed to 0.5 to 3 times the volume of the alkali liquid feed and not higher than 80% of the internal volume of the lithium precipitation reactor (1), the solenoid valve on the lithium-rich liquid feed pipe (5) is closed; in the process of adding the lithium-rich liquid, the DCS control system is used to continuously start the stirring component (2) to stir so that the alkali liquid and the lithium-rich liquid are mixed in the lithium precipitation reactor (1) to form a reaction liquid; when the volume of the lithium-rich liquid feed is half of the total volume of the lithium-rich liquid feed, the DCS control system is used to start the fluid shearing component (4) to shear the circulating reaction liquid, and the stirring component (2) is continuously started to stir the reaction liquid, and the heating component (9) is continuously started to heat the reaction liquid to a reaction temperature of 80 to 95°C; After all the lithium liquid is fed, the continuous circulation reaction time of the shear circulation reaction liquid is 0.5~2h; the shear rate of the fluid shearing component (4) is 3000~15000rpm; Step S3, using the DCS control system to close the heating component (9) and the fluid shearing component (4), open the solenoid valve on the second openable and closable discharge end (7.2), and discharge and collect the reaction liquid after lithium precipitation; when the liquid level sensor (10) detects that the liquid level in the lithium precipitation reactor (1) is lower than the stirring component (2), the DCS control system is used to close the stirring component (2); when the liquid level sensor (10) detects that the liquid level in the lithium precipitation reactor (1) is zero, the DCS control system is used to start the cleaning component to clean the lithium precipitation reactor (1).

10. The application method of the lithium precipitation reaction device according to claim 9, characterized in that: The lithium-rich solution includes any one of lithium sulfate and lithium hydrochloride; the mass concentration of lithium in the lithium-rich solution is 15-30 g / L; the alkaline solution includes a sodium carbonate solution; the mass percentage of sodium carbonate in the sodium carbonate solution is 10%-32.8%.

Images