Lithium precipitation system for lithium carbonate production

Abstract

The utility model provides a lithium precipitation system for lithium carbonate production. The lithium precipitation system for lithium carbonate production comprises an alkali liquor buffer device, the alkali liquor buffer device comprises an alkali liquor power pump, a liquor inlet pipeline, an alkali liquor buffer part and a liquor outlet pipeline, the liquor inlet pipeline, the alkali liquor buffer part and the liquor outlet pipeline are sequentially communicated, the alkali liquor buffer part comprises a plurality of alkali liquor buffer tanks which are connected in series and / or in parallel, and the liquor inlet pipeline comprises a plurality of liquor inlet branch pipes which are arranged in parallel; the lithium liquid buffering device comprises a lithium liquid power pump, and a feeding pipeline, a lithium liquid buffering part and a discharging pipeline which are communicated in sequence, the lithium liquid buffering part comprises a plurality of lithium liquid buffering tanks which are connected in series and / or in parallel, and the feeding pipeline comprises a plurality of feeding branch pipes; the lithium precipitation reaction device is provided with a lithium precipitation reaction cavity, and the discharging pipeline and the liquid outlet pipeline are both communicated with the lithium precipitation reaction cavity. According to the technical scheme, the lithium precipitation system for lithium carbonate production solves the problem that the lithium precipitation system for lithium carbonate production in the prior art produces lithium carbonate when the concentrations of a lithium-rich solution and a sodium carbonate solution are unstable, so that the product quality and the yield of lithium carbonate are influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium carbonate production, in particular to a lithium precipitation system for lithium carbonate production. Background Art

[0002] In the production process of lithium carbonate, lithium carbonate is usually produced by reacting a lithium-rich solution that has been acidified and decontaminated and has reached the process concentration requirements with a sodium carbonate solution. During the reaction process, there are relatively strict requirements on the amount of lithium-rich solution and sodium carbonate solution added, the reaction concentration, the reaction temperature, and the reaction time. However, on the one hand, since the lithium-rich solution entering the lithium precipitation workshop comes from three devices and has different concentrations, it enters the next process without buffering, which has a great impact on the product quality and yield. On the other hand, the sodium carbonate solution is prepared in a preparation tank while reacting with the lithium-rich solution, and the small volume of the reaction tank makes it difficult for the prepared sodium carbonate solution to fully dissolve. As a result, lithium carbonate production is carried out when the concentration of the sodium carbonate solution is unstable, which will affect the product quality and yield of lithium carbonate. Utility Model Content

[0003] The main purpose of the utility model is to provide a lithium precipitation system for lithium carbonate production, so as to solve the problem that the lithium precipitation system for lithium carbonate production in the prior art produces lithium carbonate when the concentrations of lithium-rich solution and sodium carbonate solution are unstable, thereby affecting the product quality and yield of lithium carbonate.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a lithium precipitation system for lithium carbonate production, comprising: an alkali solution buffer device, including an alkali solution power pump and an inlet pipeline, an alkali solution buffer part and an outlet pipeline connected in sequence, the alkali solution buffer part including a plurality of alkali solution buffer tanks arranged in series and / or parallel, and the inlet pipeline including a plurality of inlet branches arranged in parallel; a lithium liquid buffer device, including a lithium liquid power pump and a feed pipeline, a lithium liquid buffer part and an outlet pipeline connected in sequence, the lithium liquid buffer part including a plurality of lithium liquid buffer tanks arranged in series and / or parallel, and the feed pipeline including a plurality of feed branches; a lithium precipitation reaction device, having a lithium precipitation reaction chamber, and the discharge pipeline and the outlet pipeline are both connected to the lithium precipitation reaction chamber.

[0005] Furthermore, the lithium precipitation system for lithium carbonate production also includes a heat exchange device located between the lithium liquid buffer and the discharge pipeline. The heat exchange device has an inlet end, a heat exchange channel and an outlet end that are connected to each other. The inlet end is connected to the lithium liquid buffer, and the outlet end is connected to the discharge pipeline.

[0006] Furthermore, the heat exchange device includes two heat exchangers, and the two heat exchangers are arranged in parallel.

[0007] Furthermore, the lithium liquid buffer unit includes two lithium liquid buffer tanks arranged in series, and the lithium liquid buffer unit also includes a lithium liquid connecting pipeline for connecting the two lithium liquid buffer tanks, and a lithium liquid power pump is provided on the lithium liquid connecting pipeline.

[0008] Furthermore, the lithium liquid buffer unit further includes a first liquid return pipeline, one end of the first liquid return pipeline is connected to the lithium liquid connecting pipeline, and the other end of the first liquid return pipeline is connected to the first lithium liquid buffer tank of the two lithium liquid buffer tanks.

[0009] Furthermore, the lithium precipitation system for lithium carbonate production also includes a second liquid return pipeline, one end of the second liquid return pipeline is connected to the discharge pipeline, and the other end of the second liquid return pipeline is connected to the second lithium liquid buffer tank of the two lithium liquid buffer tanks.

[0010] Furthermore, the alkali liquid buffer part includes two alkali liquid buffer tanks arranged in parallel, and the liquid inlet pipeline also includes a liquid inlet main pipe, which has an inlet end and two outlet ends. Multiple liquid inlet branches are connected to the inlet end of the liquid inlet main pipe, and the two outlet ends of the liquid inlet main pipe are respectively connected to the two alkali liquid buffer tanks. An alkali liquid power pump is provided on the liquid inlet main pipe.

[0011] Furthermore, the lithium precipitation system for lithium carbonate production also includes a first reflux pipeline, one end of the first reflux pipeline is connected to the liquid outlet pipeline, and the other end of the first reflux pipeline is connected to one of the two alkali liquid buffer tanks.

[0012] Furthermore, the lithium precipitation system for lithium carbonate production also includes a second reflux pipeline, one end of the second reflux pipeline is connected to the liquid outlet pipeline, and the other end of the second reflux pipeline is connected to the other alkali liquid buffer tank of the two alkali liquid buffer tanks.

[0013] Furthermore, at least one precision filter is provided on the liquid outlet pipeline; the connection position of the first return pipeline and the liquid outlet pipeline is located between the precision filter and the alkali solution buffer; and / or, the connection position of the second return pipeline and the liquid outlet pipeline is located between the precision filter and the alkali solution buffer.

[0014] By applying the technical solution of the utility model, on the one hand, by setting up an alkali liquid buffer device, under the action of an alkali liquid power pump, a plurality of sodium carbonate solutions can be allowed to enter the alkali liquid buffer part through the corresponding plurality of liquid inlet branches for sufficient dissolution and mixing, so that the concentration of the sodium carbonate solution tends to be stable, and then the sodium carbonate solution is transported to the lithium precipitation reaction device through the liquid outlet pipeline; on the other hand, by setting up a lithium liquid buffer device, a plurality of lithium-rich solutions with different concentrations enter the lithium liquid buffer part through a plurality of feed branches, so that the plurality of lithium-rich solutions are fully mixed in the lithium liquid buffer part, so that the concentration of the lithium-rich solution can be stabilized, and then the lithium-rich solution is transported to the lithium precipitation reaction device through the discharge pipeline, so that the sodium carbonate solution with a stable concentration and the lithium-rich solution with a stable concentration can fully react in the lithium precipitation reaction chamber to generate lithium carbonate, thereby improving the product quality and yield of lithium carbonate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 The structure diagram of the lithium liquid buffer device of the lithium precipitation system for lithium carbonate production of the present invention is shown;

[0017] Figure 2 The utility model shows a structural schematic diagram of the alkali solution buffer device of the lithium precipitation system for lithium carbonate production.

[0018] The above drawings include the following reference numerals:

[0019] 1. Alkali liquid power pump; 2. Liquid inlet main pipe; 3. Liquid outlet pipeline; 4. Alkali liquid buffer tank; 5. Liquid inlet branch pipe; 7. Discharge pipeline; 8. Lithium liquid buffer tank; 9. Feed branch pipe; 10. Heat exchanger; 11. Lithium liquid connecting pipeline; 12. Lithium liquid power pump; 13. First return liquid pipeline; 14. Second return liquid pipeline; 15. First reflux pipeline; 16. Second reflux pipeline; 17. Precision filter; 18. Alkali liquid mixing tank; 19. Motor; 20. Output shaft; 22. Stirring impeller; 24. Scraper; 25. Solution preparation tank; 26. Feeding silo; 27. Control valve. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application 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.

[0021] like Figure 1 and Figure 2As shown, an embodiment of the present invention provides a lithium precipitation system for lithium carbonate production. The lithium precipitation system for lithium carbonate production includes an alkali solution buffer device, a lithium solution buffer device and a lithium precipitation reaction device, wherein the alkali solution buffer device includes an alkali solution power pump 1 and an inlet pipeline, an alkali solution buffer part and an outlet pipeline 3 connected in sequence, the alkali solution buffer part includes a plurality of alkali solution buffer tanks 4 arranged in series and / or in parallel, and the inlet pipeline includes a plurality of inlet branches 5 arranged in parallel; the lithium solution buffer device includes a lithium solution power pump 12 and a feed pipeline, a lithium solution buffer part and an outlet pipeline 7 connected in sequence, the lithium solution buffer part includes a plurality of lithium solution buffer tanks 8 arranged in series and / or in parallel, and the feed pipeline includes a plurality of feed branches 9; the lithium precipitation reaction device has a lithium precipitation reaction chamber, and the outlet pipeline 7 and the outlet pipeline 3 are both connected to the lithium precipitation reaction chamber.

[0022] In the above technical scheme, on the one hand, by setting up an alkali liquid buffer device, under the action of the alkali liquid power pump 1, a variety of sodium carbonate solutions can be allowed to enter the alkali liquid buffer part through the corresponding multiple liquid inlet branches 5 for sufficient dissolution and mixing, so that the concentration of the sodium carbonate solution tends to be stable, and then the sodium carbonate solution is transported to the lithium precipitation reaction device through the liquid outlet pipeline 3; on the other hand, by setting up a lithium liquid buffer device, a plurality of lithium-rich solutions with different concentrations enter the lithium liquid buffer part through a plurality of feed branches 9, so that the plurality of lithium-rich solutions are fully mixed in the lithium liquid buffer part, so that the concentration of the lithium-rich solution can be stabilized, and then the lithium-rich solution is transported to the lithium precipitation reaction device through the discharge pipeline 7, so that the sodium carbonate solution with a stable concentration and the lithium-rich solution with a stable concentration can fully react in the lithium precipitation reaction chamber to generate lithium carbonate, thereby improving the product quality and yield of lithium carbonate.

[0023] Specifically, in an embodiment of the present invention, the alkali solution buffer device also includes two solution configuration tanks 25, and there are two liquid inlet branches 5, which are respectively connected to the two solution configuration tanks 25. The two solution configuration tanks 25 are both used to prepare sodium carbonate solution, and the sodium carbonate solution in the two solution configuration tanks 25 enters the alkali solution buffer part through the two liquid inlet branches 5 respectively.

[0024] Specifically, in the embodiment of the present invention, each alkali liquid buffer tank 4 is provided with a motor 19, an output shaft 20 and a stirring impeller 22. The output shaft 20 is arranged in the alkali liquid buffer tank 4, and the stirring impeller 22 is connected to the outer periphery of the output shaft 20. The output shaft 20 is rotatably arranged relative to the alkali liquid buffer tank 4, and the output shaft 20 is connected to the motor 19. In this way, under the action of the motor 19, the output shaft 20 can drive the stirring impeller 22 to rotate to stir the sodium carbonate solution, so that the sodium carbonate solution in the alkali liquid buffer tank 4 is fully dissolved and mixed.

[0025] Specifically, in the embodiment of the present invention, there are three types of lithium-rich solutions, the sources of which are four-effect evaporation lithium-rich solution, 20,000 tons of mother liquor lithium-rich solution and salt field impurity removal lithium-rich solution, and there are preferably three feed branch pipes 9, which are used to respectively introduce the three lithium-rich solutions.

[0026] Preferably, in the embodiment of the present invention, the alkali liquid power pump 1 is a centrifugal pump.

[0027] like Figure 1 As shown, in an embodiment of the present invention, the lithium precipitation system for lithium carbonate production also includes a heat exchange device located between the lithium liquid buffer and the discharge pipeline 7, the heat exchange device having an inlet end, a heat exchange channel and an outlet end that are connected to each other, the inlet end is connected to the lithium liquid buffer, and the outlet end is connected to the discharge pipeline 7.

[0028] In the above technical solution, the lithium-rich solution, after being buffered by the lithium liquid buffer, flows to the inlet of the heat exchange device, is heated through the heat exchange channel, and then is transported to the discharge pipe 7 through the outlet. In this way, the temperature of the lithium-rich solution can be raised to the reaction temperature, so that the lithium-rich solution and the sodium carbonate solution react better, thereby improving the quality of the lithium carbonate product.

[0029] like Figure 1 As shown, in the embodiment of the present invention, the heat exchange device includes two heat exchangers 10, and the two heat exchangers 10 are arranged in parallel.

[0030] In the above technical solution, by providing two heat exchangers 10, the heat exchange capacity of the lithium-rich solution can be increased, thereby improving the overall heat exchange efficiency.

[0031] Specifically, in an embodiment of the present invention, the heat exchanger 10 is a plate heat exchanger, which is provided with a steam inlet pipe and a steam outlet pipe. Steam can enter the gas channel of the plate heat exchanger through the steam inlet pipe to heat the lithium-rich solution. The steam is converted into condensed water and flows out from the steam outlet pipe. The specific structure of the plate heat exchanger can refer to the existing technology and will not be repeated here.

[0032] like Figure 1 As shown, in an embodiment of the present invention, the lithium liquid buffer portion includes two lithium liquid buffer tanks 8 arranged in series, and the lithium liquid buffer portion also includes a lithium liquid connecting pipe 11 for connecting the two lithium liquid buffer tanks 8, and a lithium liquid power pump 12 is provided on the lithium liquid connecting pipe 11.

[0033] In the above technical solution, under the action of the lithium liquid power pump 12, the three lithium-rich solutions can enter the first lithium liquid buffer tank 8 through the corresponding three feed branches 9 for a buffer mixing, and then the lithium-rich solution in the first lithium liquid buffer tank 8 can flow to the second lithium liquid buffer tank 8 through the lithium liquid connecting pipe 11 to perform a secondary buffer mixing on the lithium-rich solution, which can further improve the mixing effect of the lithium-rich solution and make the concentration of the lithium-rich solution more balanced.

[0034] Specifically, in an embodiment of the present invention, the lithium liquid buffer portion further includes a pipeline for connecting the lithium liquid buffer portion and the heat exchange device, and a lithium liquid power pump 12 is provided on the pipeline to transport the mixed lithium-rich solution to the inlet end of the heat exchange device.

[0035] Specifically, in the embodiment of the present invention, the lithium liquid power pump 12 is a centrifugal pump.

[0036] Specifically, in the embodiment of the present invention, the volume of each lithium liquid buffer tank 8 is 150m 3 .

[0037] It should be noted that, in the embodiment of the present invention, one end of the two heat exchangers 10 is connected to the discharge pipeline 7 , and the other end of the two heat exchangers 10 is connected to the second lithium liquid buffer tank 8 of the two lithium liquid buffer tanks 8 .

[0038] It should be noted that, in the embodiment of the present invention, one end of the first lithium liquid buffer tank 8 is connected to the feed pipeline, and the other end of the first lithium liquid buffer tank 8 is connected to one end of the lithium liquid connecting pipeline 11, that is, the first lithium liquid buffer tank 8 is Figure 1 The left lithium liquid buffer tank 8. One end of the second lithium liquid buffer tank 8 is connected to the other end of the lithium liquid connecting pipe 11, and the other end of the second lithium liquid buffer tank 8 is connected to the heat exchange device, that is, the second lithium liquid buffer tank 8 is Figure 1 The right lithium liquid buffer tank 8.

[0039] like Figure 1 As shown, in an embodiment of the present invention, the lithium liquid buffer part further includes a first liquid return pipeline 13, one end of the first liquid return pipeline 13 is connected to the lithium liquid connecting pipeline 11, and the other end of the first liquid return pipeline 13 is connected to the first lithium liquid buffer tank 8 of the two lithium liquid buffer tanks 8.

[0040] Through the above arrangement, the three lithium-rich solutions with different concentrations flow through the first lithium liquid buffer tank 8 and are mixed. Then, the first return liquid pipeline 13 is set to allow the mixed lithium-rich solution to flow back into the first lithium liquid buffer tank 8. In this way, the mixed lithium-rich solution can be mixed again with the three unmixed lithium-rich solutions with different concentrations, so that the lithium-rich solution in the first lithium liquid buffer tank 8 is more fully mixed, thereby further improving the uniformity of the concentration of the lithium-rich solution.

[0041] It should be noted that, in the embodiment of the present invention, the lithium liquid power pump 12 on the lithium liquid communication pipeline 11 is located upstream of the connection position between the first liquid return pipeline 13 and the lithium liquid communication pipeline 11 .

[0042] like Figure 1 As shown, in an embodiment of the present invention, the lithium precipitation system for lithium carbonate production also includes a second liquid return pipeline 14, one end of the second liquid return pipeline 14 is connected to the discharge pipeline 7, and the other end of the second liquid return pipeline 14 is connected to the second lithium liquid buffer tank 8 of the two lithium liquid buffer tanks 8.

[0043] Through the above arrangement, the lithium-rich solution is mixed in the second lithium liquid buffer tank 8, flows through two plate heat exchangers and is heated, and then is transported to the outlet end of the heat exchange device. The heated lithium-rich solution can be returned to the second lithium liquid buffer tank 8 by setting a second return liquid pipeline 14. In this way, the unheated lithium-rich solution in the second lithium liquid buffer tank 8 is mixed again with the lithium-rich solution heated by the plate heat exchanger. On the one hand, the temperature of the overall lithium-rich solution can be increased, and its temperature uniformity can be increased, thereby reducing the subsequent heating time in the plate heat exchanger and improving efficiency; on the other hand, the concentration uniformity of the lithium-rich solution can also be improved.

[0044] like Figure 2 As shown, in the embodiment of the present invention, the alkali liquid buffer part includes two alkali liquid buffer tanks 4 arranged in parallel, and the liquid inlet pipeline also includes a liquid inlet main pipe 2, the liquid inlet main pipe 2 has an inlet end and two outlet ends, and multiple liquid inlet branches 5 are all connected to the inlet end of the liquid inlet main pipe 2, and the two outlet ends of the liquid inlet main pipe 2 are respectively connected to the two alkali liquid buffer tanks 4, and an alkali liquid power pump 1 is provided on the liquid inlet main pipe 2.

[0045] In the above technical solution, after the sodium carbonate solution is prepared in the solution preparation tank 25, it enters the liquid inlet main pipe 2 under the action of the alkali liquid power pump 1 for mixing and flows into two alkali liquid buffer tanks 4 arranged in parallel, and the dissolution and mixing of the sodium carbonate solution are completed in the alkali liquid buffer tank 4.

[0046] Through the above configuration, compared with setting up one alkali solution buffer tank, setting up two parallel alkali solution buffer tanks 4 can increase the mixing amount of the sodium carbonate solution, thereby improving the mixing efficiency of the sodium carbonate solution.

[0047] Specifically, in the embodiment of the present invention, the alkali liquid power pump 1 is a centrifugal pump.

[0048] Specifically, in the embodiment of the present invention, the volume of each alkali solution buffer tank 4 is 100m 3 .

[0049] like Figure 2As shown, in an embodiment of the present invention, the lithium precipitation system for lithium carbonate production also includes a first reflux pipeline 15, one end of the first reflux pipeline 15 is connected to the liquid outlet pipeline 3, and the other end of the first reflux pipeline 15 is connected to one of the two alkali liquid buffer tanks 4.

[0050] Through the above arrangement, the sodium carbonate solution mixed in the alkali liquid buffer section can flow back into an alkali liquid buffer tank 4 through the liquid outlet pipe 3 and the first reflux pipe 15 in sequence. The sodium carbonate solution flowing back into the alkali liquid buffer tank 4 is mixed again with the original sodium carbonate solution entering into the alkali liquid buffer tank 4, thereby further improving the uniformity of the concentration of the sodium carbonate solution.

[0051] like Figure 2 As shown, in an embodiment of the present invention, the lithium precipitation system for lithium carbonate production also includes a second reflux pipeline 16, one end of the second reflux pipeline 16 is connected to the liquid outlet pipeline 3, and the other end of the second reflux pipeline 16 is connected to the other alkali liquid buffer tank 4 of the two alkali liquid buffer tanks 4.

[0052] In the above technical solution, the sodium carbonate solution mixed in the alkali liquid buffer part can be refluxed into another alkali liquid buffer tank 4 through the liquid outlet pipe 3 and the second reflux pipe 16 in sequence. The sodium carbonate solution refluxed into the alkali liquid buffer tank 4 is mixed again with the original sodium carbonate solution entering the other alkali liquid buffer tank 4, thereby further improving the uniformity of the concentration of the sodium carbonate solution.

[0053] Preferably, in an embodiment of the present invention, an alkali liquid power pump 1 is provided on the liquid outlet pipeline 3, and the alkali liquid power pump 1 is located upstream of the connection position between the first return pipeline 15 and the liquid outlet pipeline 3 and the connection position between the second return pipeline 16 and the liquid outlet pipeline 3.

[0054] like Figure 2 As shown, in an embodiment of the present invention, at least one precision filter 17 is provided on the liquid outlet pipeline 3; the connection position of the first return pipeline 15 and the liquid outlet pipeline 3 is located between the precision filter 17 and the alkali solution buffer portion; and / or, the connection position of the second return pipeline 16 and the liquid outlet pipeline 3 is located between the precision filter 17 and the alkali solution buffer portion.

[0055] Through the above arrangement, the mixed sodium carbonate solution flows into the liquid outlet pipe 3 and then flows into the precision filter 17. In this way, solid particles in the sodium carbonate solution can be effectively removed, so that the sodium carbonate solution flows more smoothly, thereby improving the overall efficiency of the system.

[0056] Specifically, in the embodiment of the present invention, two precision filters 17 are provided and are arranged in parallel, so that the filtering amount of the sodium carbonate solution can be increased, thereby improving the filtering efficiency.

[0057] Specifically, in an embodiment of the present invention, the lithium precipitation system for lithium carbonate production further includes an alkali solution mixing tank 18 , which is disposed downstream of the precision filter 17 , thereby further mixing the sodium carbonate solution filtered by the precision filter 17 .

[0058] Specifically, in the embodiment of the present invention, another alkali liquid power pump 1 is provided on the liquid outlet pipeline 3 , and the alkali liquid power pump 1 is located downstream of the alkali liquid mixing tank 18 .

[0059] It should be noted that in the embodiment of the present invention, the lithium precipitation system for lithium carbonate production also includes a plurality of control valves 27, and the plurality of control valves 27 are respectively arranged on each pipeline (for example: the first return liquid pipeline 13, the lithium liquid connecting pipeline 11, the discharge pipeline 7, the second return liquid pipeline 14, the liquid inlet main pipe 2, the liquid inlet branch pipe 5, the first reflux pipeline 15, the liquid outlet pipeline 3, the second reflux pipeline 16 and other pipelines). In this way, the on and off of each pipeline can be controlled as needed. The specific structure of the control valve 27 can adopt the existing technology and will not be repeated here.

[0060] It should be noted that in the embodiment of the present invention, the lithium precipitation system for lithium carbonate production is composed of multiple buffer tanks and pipelines and other components, with low manufacturing cost, simple operation, and can bring greater economic benefits.

[0061] Specifically, in an embodiment of the present invention, the lithium precipitation system for lithium carbonate production also includes a feeding bin 26 and a scraper 24. The scraper 24 is used to transport the material in the feeding bin to the solution preparation tank 25 to prepare the sodium carbonate solution. The specific structure of the feeding bin 26 and the scraper 24 can adopt the existing technology and will not be repeated here.

[0062] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: on the one hand, by setting an alkali liquid buffer device, under the action of an alkali liquid power pump, a plurality of sodium carbonate solutions can be allowed to enter the alkali liquid buffer part through the corresponding plurality of liquid inlet branches for sufficient dissolution and mixing, so that the concentration of the sodium carbonate solution tends to be stable, and then the sodium carbonate solution is transported to the lithium precipitation reaction device through the liquid outlet pipeline; on the other hand, by setting a lithium liquid buffer device, a plurality of lithium-rich solutions with different concentrations enter the lithium liquid buffer part through a plurality of feed branches, so that the plurality of lithium-rich solutions are fully mixed in the lithium liquid buffer part, so that the concentration of the lithium-rich solution can be stabilized, and then the lithium-rich solution is transported to the lithium precipitation reaction device through the discharge pipeline, so that the sodium carbonate solution with a stable concentration and the lithium-rich solution with a stable concentration can fully react in the lithium precipitation reaction chamber to generate lithium carbonate, thereby improving the product quality and yield of lithium carbonate.

[0063] The above 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 the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A lithium precipitation system for lithium carbonate production, characterized in that: include: An alkali liquid buffer device comprises an alkali liquid power pump (1) and a liquid inlet pipeline, an alkali liquid buffer portion and a liquid outlet pipeline (3) connected in sequence, wherein the alkali liquid buffer portion comprises a plurality of alkali liquid buffer tanks (4) arranged in series and / or in parallel, and the liquid inlet pipeline comprises a plurality of liquid inlet branches (5) arranged in parallel; A lithium liquid buffer device comprises a lithium liquid power pump (12) and a feed pipeline, a lithium liquid buffer portion and a discharge pipeline (7) connected in sequence, wherein the lithium liquid buffer portion comprises a plurality of lithium liquid buffer tanks (8) arranged in series and / or in parallel, and the feed pipeline comprises a plurality of feed branches (9); The lithium precipitation reaction device comprises a lithium precipitation reaction chamber, wherein the material discharge pipeline (7) and the liquid discharge pipeline (3) are both connected to the lithium precipitation reaction chamber.

2. The lithium carbonate production lithium precipitation system according to claim 1, characterized in that: The lithium precipitation system for lithium carbonate production further comprises a heat exchange device located between the lithium liquid buffer portion and the discharge pipeline (7), wherein the heat exchange device has an inlet end, a heat exchange channel and an outlet end that are connected to each other, the inlet end is connected to the lithium liquid buffer portion, and the outlet end is connected to the discharge pipeline (7).

3. The lithium carbonate production lithium precipitation system according to claim 2, characterized in that: The heat exchange device comprises two heat exchangers (10), and the two heat exchangers (10) are arranged in parallel.

4. The lithium precipitation system for lithium carbonate production according to claim 1, characterized in that: The lithium liquid buffer section comprises two lithium liquid buffer tanks (8) arranged in series, and the lithium liquid buffer section further comprises a lithium liquid connecting pipe (11) for connecting the two lithium liquid buffer tanks (8), and the lithium liquid power pump (12) is provided on the lithium liquid connecting pipe (11).

5. The lithium precipitation system for lithium carbonate production according to claim 4, characterized in that: The lithium liquid buffer section further comprises a first liquid return pipeline (13), one end of the first liquid return pipeline (13) being in communication with the lithium liquid connecting pipeline (11), and the other end of the first liquid return pipeline (13) being in communication with the first of the two lithium liquid buffer tanks (8).

6. The lithium precipitation system for lithium carbonate production according to claim 2, characterized in that: The lithium carbonate production lithium precipitation system further comprises a second liquid return pipeline (14), one end of the second liquid return pipeline (14) is connected to the discharge pipeline (7), and the other end of the second liquid return pipeline (14) is connected to the second lithium liquid buffer tank (8) of the two lithium liquid buffer tanks (8).

7. The lithium precipitation system for lithium carbonate production according to any one of claims 1 to 6, characterized in that: The alkali solution buffer section further comprises two alkali solution buffer tanks (4) arranged in parallel, and the liquid inlet pipeline further comprises a liquid inlet main pipe (2), the liquid inlet main pipe (2) having an inlet end and two outlet ends, a plurality of liquid inlet branch pipes (5) are all in communication with the inlet end of the liquid inlet main pipe (2), and the two outlet ends of the liquid inlet main pipe (2) are respectively in communication with the two alkali solution buffer tanks (4), and the liquid inlet main pipe (2) is provided with the alkali solution power pump (1).

8. The lithium precipitation system for lithium carbonate production according to claim 7, characterized in that: The lithium precipitation system for lithium carbonate production further comprises a first reflux pipeline (15), one end of the first reflux pipeline (15) being in communication with the liquid outlet pipeline (3), and the other end of the first reflux pipeline (15) being in communication with one of the two alkali liquid buffer tanks (4).

9. The lithium precipitation system for lithium carbonate production according to claim 8, characterized in that: The lithium precipitation system for lithium carbonate production further comprises a second reflux pipeline (16), one end of the second reflux pipeline (16) being in communication with the liquid outlet pipeline (3), and the other end of the second reflux pipeline (16) being in communication with the other of the two alkali solution buffer tanks (4).

10. The lithium precipitation system for lithium carbonate production according to claim 9, characterized in that: At least one precision filter (17) is provided on the liquid outlet pipeline (3); The connection position between the first reflux pipeline (15) and the liquid outlet pipeline (3) is located between the precision filter (17) and the alkali solution buffer; and / or, The connection position between the second reflux pipeline (16) and the liquid outlet pipeline (3) is located between the precision filter (17) and the alkali solution buffer portion.

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