A system for producing lithium phosphate
Patent Information
- Application Number
- CN202522219991.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-21
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-10-21
AI Technical Summary
[0004]本实用新型的目的在于提供一种制备磷酸锂的系统，解决现有技术中料液前处理过程复杂，处理效率低的技术问题
1.通过该系统，可实现磷源与锂源在同一反应器中相互混合，并通过控制从不同出料口出料达到不同的反应时间，以此达到对含锂溶液中杂质去除深度的目的；
Smart Images
Figure CN224712033U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium salt production technology, specifically to a system for preparing lithium phosphate. Background Technology
[0002] Before the rise of the new energy industry, lithium phosphate was mainly used in the production of colored phosphors, specialty glass, and optical disc materials, with overall demand not being large. In recent years, however, lithium phosphate has been widely used as a raw material in the battery industry, and its production capacity has increased year by year.
[0003] Currently, most lithium phosphate production uses crude lithium carbonate or crude lithium phosphate from salt lakes as raw materials, which undergo reverse dissolution to remove impurities before being used to prepare lithium phosphate products. Alternatively, high-purity lithium phosphate is prepared from recycled retired batteries. These lithium phosphate preparation processes require significant effort and are complex in the pretreatment of the feed solution, resulting in low processing efficiency. They also require a large number of auxiliary devices for impurity removal and purification. Utility Model Content
[0004] The purpose of this invention is to provide a system for preparing lithium phosphate, which solves the technical problems of complex pretreatment process and low processing efficiency in the prior art.
[0005] This utility model discloses a system for preparing lithium phosphate, including a heat exchange system, a reaction system, and a solid-liquid separation system; The reaction system includes a first reactor, which comprises a mixing chamber and a reaction chamber, the bottoms of which are connected.
[0006] Working principle: The mixing chamber is used to mix lithium and phosphorus sources, and the reaction chamber is used to provide sufficient reaction space and time for the precipitation reaction. With the addition of phosphorus and lithium sources, the first reactor can achieve uniform mixing of materials and then quickly enter the reaction chamber through the bottom connecting component from the mixing chamber, which can greatly increase the processing capacity and achieve continuous feeding and continuous discharge.
[0007] Furthermore, stirring systems are respectively installed on the mixing chamber and the reaction chamber.
[0008] By setting up a stirring system, the materials in the mixing chamber are mixed more quickly and evenly, thus enhancing the processing capacity of the reaction chamber.
[0009] Furthermore, the reaction chamber is equipped with multiple discharge ports at different heights.
[0010] Furthermore, there are three discharge ports, with their heights decreasing from high to low.
[0011] By setting three discharge ports at different heights, the discharge ports at different positions can be opened according to the required reaction time. While keeping the feed flow rate constant, this can address situations where the reaction process is incomplete and the reaction time needs to be extended.
[0012] Furthermore, the solid-liquid separation system includes a first solid-liquid separation device, which is connected to the first reactor.
[0013] By setting up a first solid-liquid separation device, the crude lithium phosphate produced in the first reactor can be separated from the mother liquor.
[0014] Furthermore, a material transfer tank is provided at the outlet of the first solid-liquid separation device.
[0015] By setting up a transfer tank for the liquid feed, the main function is to receive the mother liquor separated by the first solid-liquid separation device, while also serving as a buffer to stably transport the mother liquor produced by the first solid-liquid separation device to subsequent processes.
[0016] Furthermore, the reaction system also includes a second reactor, which is connected to the first solid-liquid separation device.
[0017] By setting up a second reactor to receive the phosphorus source and the mother liquor separated by the first solid-liquid separation device, the two are mixed and reacted to generate high-purity lithium phosphate.
[0018] Furthermore, a stirring system is provided on the second reactor.
[0019] Furthermore, the solid-liquid separation system also includes a second solid-liquid separation device, which is connected to the second reactor.
[0020] A second solid-liquid separation device is installed to separate the lithium phosphate produced in the second reactor from the final mother liquor.
[0021] Furthermore, the second solid-liquid separation device is also equipped with a pure water pipeline for adding pure water to wash the centrifuged product, ultimately obtaining the lithium phosphate product.
[0022] Furthermore, the heat exchange system includes a first heat exchanger and a second heat exchanger, wherein the first heat exchanger is connected to a lithium-containing solution pipeline outside the system, and the second heat exchanger is connected to a phosphorus-containing solution pipeline outside the system. The first heat exchanger is also connected to the first reactor, and the second heat exchanger is also connected to the first reactor and the second reactor.
[0023] By setting up lithium-containing solution pipelines and phosphorus-containing solution pipelines, after heat exchange in the heat exchange system, the phosphorus-containing solution enters the first reactor and the second reactor, while the lithium-containing solution enters the first reactor. The first heat exchanger heats the lithium-containing solution from the lithium-containing solution pipeline, and the second heat exchanger heats the phosphorus-containing solution from the phosphorus-containing solution pipeline. The heated lithium-containing solution and phosphorus-containing solution can accelerate the reaction rate of the lithium phosphate precipitation process and improve the lithium phosphate precipitation rate, that is, improve the lithium yield.
[0024] Compared with the prior art, the beneficial effects of this utility model are: 1. This system enables the mixing of phosphorus and lithium sources in the same reactor, and by controlling the discharge from different outlets to achieve different reaction times, thereby achieving the purpose of removing impurities from lithium-containing solutions to varying degrees. 2. Before preparing lithium phosphate products, there is no need to introduce a large amount of auxiliary agents into the lithium-containing solution to remove calcium and silicon, thus avoiding contamination by other auxiliary agents; 3. By controlling the simultaneous start and stop of feeding of lithium-containing and phosphorus-containing solutions when adding them to the reactor, this system can achieve larger particle size of lithium phosphate products, which is beneficial for solid-liquid separation. 4. By setting up a stirring system, the materials in the mixing chamber are mixed more quickly and evenly, thus increasing the processing capacity of the reaction chamber; 5. By setting three discharge ports at different heights, the discharge ports at different positions can be opened according to the required reaction time. While keeping the feed flow rate constant, it can cope with situations where the reaction process is incomplete and the reaction time needs to be extended. 6. By setting up a first solid-liquid separation device, the first solid-liquid separation device can separate the crude lithium phosphate produced in the first reactor from the mother liquor; 7. By setting up a material transfer tank, the mother liquor separated by the first solid-liquid separation device is mainly received, and at the same time it also has a buffering function to stably transport the mother liquor generated by the first solid-liquid separation device to the subsequent processes; 8. By setting up a second reactor, the phosphorus source and the mother liquor separated by the first solid-liquid separation device are received, so as to achieve the mixing and reaction of the two to generate high-purity lithium phosphate; 9. A second solid-liquid separation device is provided to separate the lithium phosphate produced in the second reactor from the final mother liquor; 10. By setting up lithium-containing solution pipelines and phosphorus-containing solution pipelines, after heat exchange in the heat exchange system, the phosphorus-containing solution enters the first reactor and the second reactor, and the lithium-containing solution enters the first reactor. The first heat exchanger heats the lithium-containing solution from the lithium-containing solution pipeline, and the second heat exchanger heats the phosphorus-containing solution from the phosphorus-containing solution pipeline. The heated lithium-containing solution and phosphorus-containing solution can accelerate the reaction rate of the lithium phosphate precipitation process and improve the lithium phosphate precipitation rate, that is, improve the lithium yield. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the system structure for preparing lithium phosphate according to this invention.
[0027] In the above figures, the meanings of each mark are as follows: 01-heat exchange system, 101-first heat exchanger, 102-second heat exchanger, 02-first reactor, 201-mixing chamber, 202-reaction chamber, 03-first solid-liquid separation device, 04-transfer tank, 05-second reactor, 06-second solid-liquid separation device, 11-lithium-containing solution pipeline, 12-phosphorus-containing solution pipeline. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments.
[0029] Example 1 The technical solution adopted in this embodiment is as follows: like Figure 1 As shown, a system for preparing lithium phosphate includes a heat exchange system 01, a reaction system, and a solid-liquid separation system; The reaction system includes a first reactor 02, which includes a mixing chamber 201 and a reaction chamber 202, and the bottoms of the mixing chamber 201 and the reaction chamber 202 are connected.
[0030] Working principle: The mixing chamber 201 is used to mix lithium and phosphorus sources, and the reaction chamber 202 is used to provide sufficient reaction space and time for the precipitation reaction. With the addition of phosphorus and lithium sources, the first reactor 02 can achieve uniform mixing of materials and then quickly enter the reaction chamber 202 through the bottom connecting component from the mixing chamber 201, which can greatly increase the processing capacity and realize continuous feeding and continuous discharge.
[0031] Example 2 This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figure 1 As shown, based on Example 1, the following improvements are disclosed: stirring systems are respectively provided on the mixing chamber 201 and the reaction chamber 202; the reaction chamber 202 is provided with multiple discharge ports of different heights, and there are three discharge ports with heights ranging from high to low.
[0032] By setting up a stirring system, the materials in the mixing chamber 201 are mixed more quickly and evenly, and the processing capacity of the reaction chamber 202 is enhanced.
[0033] By setting three discharge ports at different heights, the discharge ports at different positions can be opened according to the required reaction time. While keeping the feed flow rate constant, this can address situations where the reaction process is incomplete and the reaction time needs to be extended.
[0034] Example 3 This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figure 1 As shown, based on Embodiment 2, the following improvements are disclosed: the solid-liquid separation system includes a first solid-liquid separation device 03, which is connected to the first reactor 02. A feed transfer tank 04 is provided at the outlet of the first solid-liquid separation device 03. The reaction system also includes a second reactor 05, which is connected to the first solid-liquid separation device 03 through the feed transfer tank 04. A stirring system is provided on the second reactor 05.
[0035] By setting up a first solid-liquid separation device 03, the first solid-liquid separation device 03 can separate the crude lithium phosphate produced in the first reactor 02 from the mother liquor.
[0036] By setting up a material transfer tank 04, the mother liquor separated by the first solid-liquid separation device 03 is mainly received, and at the same time it also has a buffering function to stably transport the mother liquor generated by the first solid-liquid separation device 03 to the subsequent processes.
[0037] By setting up a second reactor 05, the phosphorus source and the mother liquor separated by the first solid-liquid separation device 03 are received, and the two are mixed and reacted to generate high-purity lithium phosphate.
[0038] Example 4 This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figure 1 As shown, based on Example 3, the following improvement is disclosed: the solid-liquid separation system further includes a second solid-liquid separation device 06, which is connected to the second reactor 05. The second solid-liquid separation device 06 is also provided with a pure water pipeline for adding pure water to wash the centrifuged product, and finally obtains the lithium phosphate product.
[0039] A second solid-liquid separation device 06 is provided to separate the lithium phosphate produced in the second reactor 05 from the final mother liquor.
[0040] Example 5 This embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figure 1As shown, based on embodiment 4, the following improvement is disclosed: the heat exchange system 01 includes a first heat exchanger 101 and a second heat exchanger 102. The first heat exchanger 101 is connected to a lithium-containing solution pipeline 11 outside the system, and the second heat exchanger 102 is connected to a phosphorus-containing solution pipeline 12 outside the system. The first heat exchanger 101 is also connected to the first reactor 02, and the second heat exchanger 102 is also connected to the first reactor 02 and the second reactor 05.
[0041] By setting up lithium-containing solution pipeline 11 and phosphorus-containing solution pipeline 12 for heat exchange in heat exchange system 01, the phosphorus-containing solution enters the first reactor 02 and the second reactor 05, and the lithium-containing solution enters the first reactor 02. The first heat exchanger 101 heats the lithium-containing solution from lithium-containing solution pipeline 11, and the second heat exchanger 102 heats the phosphorus-containing solution from phosphorus-containing solution pipeline 12. The heated lithium-containing solution and phosphorus-containing solution can accelerate the reaction rate of lithium phosphate precipitation and improve the lithium phosphate precipitation rate, that is, improve the lithium yield.
[0042] The above are the embodiments listed in this example. However, this example is not limited to the optional embodiments described above. Those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments. Anyone can derive other various forms of embodiments based on the inspiration of this example. The above specific embodiments should not be construed as limiting the scope of protection of this example. The scope of protection of this example should be determined by the claims, and the specification can be used to interpret the claims.
Claims
1. A system for preparing lithium phosphate, characterized in that: Includes a heat exchange system (01), a reaction system, and a solid-liquid separation system; The reaction system includes a first reactor (02), which includes a mixing chamber (201) and a reaction chamber (202), and the mixing chamber (201) and the reaction chamber (202) are connected at the bottom.
2. The system for preparing lithium phosphate according to claim 1, characterized in that: The mixing chamber (201) and the reaction chamber (202) are respectively equipped with stirring systems.
3. The system for preparing lithium phosphate according to claim 1, characterized in that: The reaction chamber (202) is equipped with multiple discharge ports of different heights.
4. The system for preparing lithium phosphate according to claim 3, characterized in that: There are three discharge ports, arranged from high to low.
5. The system for preparing lithium phosphate according to claim 1, characterized in that: The solid-liquid separation system includes a first solid-liquid separation device (03), which is connected to the first reactor (02).
6. The system for preparing lithium phosphate according to claim 5, characterized in that: The first solid-liquid separation device (03) has a liquid transfer tank (04) installed at its outlet.
7. The system for preparing lithium phosphate according to claim 5, characterized in that: The reaction system also includes a second reactor (05), which is connected to the first solid-liquid separation device (03).
8. The system for preparing lithium phosphate according to claim 7, characterized in that: The solid-liquid separation system further includes a second solid-liquid separation device (06), which is connected to the second reactor (05).
9. The system for preparing lithium phosphate according to claim 8, characterized in that: The second solid-liquid separation device (06) is also equipped with a pure water pipeline for adding pure water to wash the product after centrifugation.
10. A system for preparing lithium phosphate according to claim 8, characterized in that: The heat exchange system (01) includes a first heat exchanger (101) and a second heat exchanger (102). The first heat exchanger (101) is connected to a lithium-containing solution pipeline (11) outside the system, and the second heat exchanger (102) is connected to a phosphorus-containing solution pipeline (12) outside the system. The first heat exchanger (101) is also connected to the first reactor (02), and the second heat exchanger (102) is also connected to the first reactor (02) and the second reactor (05).