Treatment system for concentrated water liquid of lithium phosphate production line

Abstract

The utility model discloses a treatment system for concentrated water of a lithium phosphate production line. The treatment system comprises a wastewater storage tank, a freezing reaction kettle, a centrifugal device, an evaporation reaction kettle and a liquid storage tank. According to the treatment system, under the conditions of low energy consumption and simple operation, concentrated water liquid treatment can be effectively carried out to obtain high-purity by-products sodium sulfate and sodium chloride carnallite, system optimization can be further carried out on the treatment system, the treatment system comprises circulating treatment and nanofiltration equipment additionally provided with an evaporation reaction kettle, and the treatment system is suitable for large-scale industrial production. Therefore, the high-purity sodium chloride salt can be obtained while the concentrated water liquid is treated to obtain the high-purity byproduct sodium sulfate.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment systems, and particularly relates to a treatment system for concentrated water from a lithium phosphate production line. Background Technology

[0002] In production lines that use recycled waste battery powder to produce lithium phosphate, the feed solution is continuously concentrated and circulated within the system, resulting in the accumulation of a large amount of concentrated water. This concentrated water typically contains a large amount of soluble inorganic salts such as chloride ions, sulfate ions, phosphate ions, and sodium ions. This concentrated water is present throughout every factory, regardless of whether it is added during production, circulated within the system, or recycled after wastewater treatment. High-salt-content concentrated water is generated in all these processes.

[0003] The continuous accumulation and enrichment of soluble inorganic salts can lead to reduced evaporation efficiency and increased operating costs in the production line. In severe cases, it can even cause equipment failure and affect the quality of lithium phosphate products. Therefore, concentrated liquid needs to be treated by opening the circuit regularly.

[0004] Due to the extreme difficulty in treating concentrated wastewater, efficient and reliable methods are needed for volume reduction. Current treatment methods for concentrated wastewater mainly include combined biological and membrane filtration processes, low-temperature vacuum drying technology, saline wastewater concentration and crystallization systems, and filter plate devices. While these processes can achieve compliant discharge, they suffer from drawbacks such as large equipment footprint, high investment and disposal costs, long installation periods, low filtration efficiency, and difficulty in self-cleaning impurities.

[0005] Based on this, we are designing and researching a new type of concentrated liquid treatment system for lithium phosphate production lines, aiming to achieve timely deployment, solve existing problems in the production lines, simplify equipment installation and operation, and effectively improve production efficiency. Utility Model Content

[0006] Purpose of the utility model: The technical problem to be solved by this utility model is to provide a novel concentrated liquid treatment system for lithium phosphate production lines, which not only has a long service life, is easy to operate, and has high operating efficiency, but also can obtain high-purity sodium sulfate, miscellaneous salts, or high-purity sodium chloride by-products.

[0007] Technical solution: The present invention relates to a treatment system for concentrated liquid in a lithium phosphate production line, the system comprising:

[0008] Wastewater storage tank for collecting and storing concentrated liquid from the lithium phosphate production line;

[0009] A refrigerated reactor is connected to the discharge end of a wastewater storage tank to cool the concentrated liquid and achieve low-temperature crystallization of sodium sulfate.

[0010] The first centrifuge device has its feed end connected to the discharge end of the refrigerated reactor to achieve solid-liquid separation in the refrigerated reactor and obtain sodium sulfate crystals and slurry.

[0011] The first evaporation reactor is connected at the feed end to the slurry discharge end of the first centrifugal device to evaporate excess water in the slurry until sodium chloride precipitates out, thus obtaining a new slurry.

[0012] The second centrifugal device is connected at the feed end to the discharge end of the first evaporation reactor to achieve solid-liquid separation of the slurry obtained in the first evaporation reactor, and to obtain impurities and new slurry.

[0013] The liquid storage tank has its inlet end connected to the slurry outlet end of the second centrifuge, and its outlet end is circulated to the inlet end of the first evaporation reactor through a pipeline.

[0014] Furthermore, the concentrated liquid treatment system of this lithium phosphate production line can also be:

[0015] Wastewater storage tank for collecting and storing concentrated liquid from the lithium phosphate production line;

[0016] A refrigerated reactor is connected to the discharge end of a wastewater storage tank to cool the concentrated liquid and achieve low-temperature crystallization of sodium sulfate.

[0017] The first centrifuge device has its feed end connected to the discharge end of the refrigerated reactor to achieve solid-liquid separation in the refrigerated reactor and obtain sodium sulfate crystals and slurry.

[0018] The first evaporation reactor is connected at its feed end to the slurry discharge end of the first centrifugal device. It evaporates excess water in the slurry until sodium chloride reaches saturation, thus obtaining a new slurry. The discharge end of the first evaporation reactor is circulated through a pipeline to a freezing reactor so that the new slurry can be circulated and frozen to crystallize.

[0019] The second evaporation reactor is connected to the discharge end of the slurry after circulating freeze crystallization of the first centrifuge device, so as to evaporate the excess water in the slurry obtained by circulating freeze crystallization until sodium chloride precipitates out, and obtain new slurry.

[0020] The second centrifugal device is connected at the feed end to the discharge end of the second evaporation reactor to achieve solid-liquid separation of the slurry obtained in the second evaporation reactor, and to obtain high-purity sodium chloride and new slurry.

[0021] The liquid storage tank has its inlet end connected to the slurry outlet end of the second centrifuge, and its outlet end is connected to the inlet end of the second evaporation reactor through a pipeline for further evaporation and crystallization.

[0022] Furthermore, the concentrated liquid treatment system of this lithium phosphate production line can also be:

[0023] Wastewater storage tank for collecting and storing concentrated liquid from the lithium phosphate production line;

[0024] A refrigerated reactor is connected to the discharge end of a wastewater storage tank to cool the concentrated liquid and achieve low-temperature crystallization of sodium sulfate.

[0025] The first centrifuge device has its feed end connected to the discharge end of the refrigerated reactor to achieve solid-liquid separation in the refrigerated reactor and obtain sodium sulfate crystals and slurry.

[0026] The first evaporation reactor is connected at the feed end to the slurry discharge end of the first centrifugal device. The excess water in the slurry is evaporated until the sodium chloride is saturated, and a new slurry is obtained.

[0027] The nanofiltration equipment has its feed end connected to the discharge end of the first evaporation reactor to remove sodium sulfate from the slurry and obtain pure sodium chloride slurry.

[0028] The concentration reactor is connected to the sodium chloride slurry outlet of the nanofiltration equipment to concentrate sodium chloride.

[0029] Furthermore, the concentrated liquid treatment system of this lithium phosphate production line can also be:

[0030] Wastewater storage tank for collecting and storing concentrated liquid from the lithium phosphate production line;

[0031] A refrigerated reactor is connected to the discharge end of a wastewater storage tank to cool the concentrated liquid and achieve low-temperature crystallization of sodium sulfate.

[0032] The first centrifuge device has its feed end connected to the discharge end of the refrigerated reactor to achieve solid-liquid separation in the refrigerated reactor and obtain sodium sulfate crystals and slurry.

[0033] The nanofiltration equipment has its feed end connected to the discharge end of the first centrifuge device to intercept sodium sulfate in the slurry and obtain pure sodium chloride slurry;

[0034] The first evaporation reactor is connected at the feed end to the sodium chloride slurry discharge end of the nanofiltration equipment. It evaporates the excess water in the sodium chloride slurry until sodium chloride precipitates out, thus obtaining a new slurry.

[0035] The second centrifugal device is connected at the feed end to the discharge end of the first evaporation reactor to achieve solid-liquid separation of the slurry obtained in the first evaporation reactor, and to obtain high-purity sodium chloride and new slurry.

[0036] The liquid storage tank has its inlet end connected to the slurry outlet end of the second centrifuge, and its outlet end is connected to the inlet end of the first evaporation reactor through a pipeline for further evaporation and crystallization.

[0037] Furthermore, the first centrifugal device of the above-mentioned processing system of this utility model is also connected in sequence to the sodium sulfate dissolving tank and the MVR device at the sodium sulfate discharge end.

[0038] Furthermore, the sodium sulfate outlet of the nanofiltration device in the above-mentioned treatment system of this utility model is circulated to the feed end of the Glauber's salt dissolving tank through a pipeline.

[0039] Furthermore, the above-mentioned processing system of this utility model also includes a water cooling device for providing circulating cooling water to the refrigerated reactor.

[0040] Furthermore, the above-mentioned processing system of this utility model also includes a steam generating device for providing steam to the evaporation reactor.

[0041] Beneficial effects: Compared with the prior art, the advantages of this utility model are: the concentrated liquid treatment system can obtain high-purity sodium sulfate by-products, miscellaneous salts, or high-purity sodium chloride, turning waste into treasure, reducing costs and increasing efficiency; at the same time, the treatment system is compatible with existing production lines, that is, it has low energy consumption, simple operation, no need for long-term start-up, and intermittent start-up saves water, electricity and gas consumption. Attached Figure Description

[0042] Figure 1 This is the first processing system of this utility model;

[0043] Figure 2 This is the second processing system of the present invention;

[0044] Figure 3 This is the third processing system of this utility model;

[0045] Figure 4 This is the fourth processing system of this utility model. Detailed Implementation

[0046] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] It should be noted that all system components used in this invention are known in the art. For example, the refrigeration reactor used is a conventional enamel-lined reactor with a cooling water jacket. Chilled water is supplied to the air-cooled chiller unit (which can be model LC08F) through a water cooling device, flowing into the jacket of the refrigeration section of the enamel-lined reactor to absorb the heat of the concentrated water liquid in the enamel-lined reactor and provide a 0°C low-temperature environment.

[0048] The centrifuge device can be a scraper centrifuge (which can be of the vertical Φ1250 model). The model of the nanofiltration equipment can be SMQNF-10. The model of the concentration reactor is a 16 m³ jacketed enamel reactor. The evaporation reactor is a conventional enamel reactor with a steam jacket. Steam is introduced into the jacket, and through a steam regulating valve connected to the equipped steam generating device, the temperature inside the jacket is controlled to change the real-time temperature inside the reactor, providing temperature conditions for the evaporation of the liquid material and heating the frozen liquid in the enamel reactor. The MVR device is a two-effect MVR evaporator, which is also a well-known component in the art.

[0049] The treatment system of the present utility model is a treatment system supporting the concentrated water liquid of the lithium phosphate production line. It can treat the concentrated water liquid to obtain high-purity sodium sulfate by-products, and at the same time can also obtain sodium chloride miscellaneous salts or high-purity sodium chloride by-products.

[0050] Specifically, as Figure 1 shown, the treatment system includes a waste water storage tank 1 for collecting and storing the concentrated water liquid of the lithium phosphate production line, a freezing reactor 2 connected to the waste water storage tank 1, and a water cooling device 11 supporting the freezing reactor 2. The concentrated water liquid is subjected to low-temperature crystallization through the freezing reactor 2 to obtain most of the mirabilite crystals. The discharge end of the freezing reactor 2 is connected to the feed end of the first centrifugal device 3. The slurry containing mirabilite crystals obtained in the freezing reactor 2 is pumped into the first centrifugal device 3 to separate the mirabilite. The mirabilite separated by the first centrifugal device 3 enters the dissolution and re-evaporation crystallization production line to obtain by-product sodium sulfate without obvious caking. That is, the crystal discharge end of the first centrifugal device 3 is connected to the mirabilite dissolution tank 9 for dissolving mirabilite, and the discharge port of the mirabilite dissolution tank 9 is also connected to the MVR device 10 to obtain high-purity by-product sodium sulfate. The slurry discharge end of the first centrifugal device 3 is then connected to the first evaporation reactor 4. The frozen slurry is heated through the first evaporation reactor 4 to evaporate the excess water until sodium chloride precipitates. The slurry treated by the first evaporation reactor 4 then enters the second centrifugal device 5 connected to it for solid-liquid separation to obtain sodium chloride miscellaneous salts containing a small amount of sodium sulfate. The slurry obtained by the second centrifugal device 5 enters the liquid storage tank 6 and can be further circulated through a pipeline to the first evaporation reactor 4 for cyclic evaporation treatment until sodium chloride miscellaneous salts are obtained. That is, by treating the concentrated water liquid through this treatment system, sodium sulfate by-products and sodium chloride miscellaneous salt by-products can be obtained, and the content of sodium sulfate in the miscellaneous salts is about 28%.

[0051] In addition, based on the system for obtaining sodium chloride miscellaneous salt by-products, it can be further optimized to obtain high-purity sodium chloride by-products and sodium sulfate by-products. Specifically, as Figure 2As shown in the figure, the processing system includes a wastewater storage tank 1 for collecting and storing the concentrated wastewater of the lithium phosphate production line, a freezing reactor 2 connected to the wastewater storage tank 1, and a water cooling device 11 supporting the freezing reactor 2. The concentrated wastewater is subjected to low-temperature crystallization in the freezing reactor 2 to obtain most of the mirabilite crystals. The discharge end of the freezing reactor 2 is connected to the feed end of the first centrifugation device 3. The slurry containing mirabilite crystals obtained in the freezing reactor 2 is pumped into the first centrifugation device 3 to separate the mirabilite. The mirabilite separated by the first centrifugation device 3 enters the dissolution and re-evaporation crystallization production line to obtain a by-product sodium sulfate without obvious agglomeration. That is, the crystal discharge end of the first centrifugation device 3 is connected to the mirabilite dissolution tank 9 for dissolving mirabilite, and the discharge port of the mirabilite dissolution tank 9 is further connected to the MVR device 10 to obtain a by-product sodium sulfate with high purity. The slurry discharge end of the first centrifugation device 3 is then connected to the first evaporation reactor 4. The frozen slurry is heated in the first evaporation reactor 4 to evaporate the excess water until sodium chloride reaches saturation. At this time, the slurry treated by the first evaporation reactor 4 is circulated to the freezing reactor 2 for cyclic freezing crystallization to obtain a cyclic crystallization slurry. The cyclic crystallization slurry then enters the second evaporation reactor 7 connected to the first centrifugation device 3 to heat the frozen cyclic slurry and evaporate the excess water until sodium chloride precipitates to obtain a slurry. The slurry then enters the second centrifugation device 5 connected to the second evaporation reactor 7 for solid-liquid separation to obtain a by-product sodium chloride with high purity. The slurry obtained by the second centrifugation device 5 enters the liquid storage tank 6 and can be further circulated through a pipeline to the second evaporation reactor 5 for cyclic evaporation treatment until a by-product sodium chloride is obtained. That is, the discharge port of the first centrifugation device 3 is respectively connected to the first evaporation reactor 4 and the second evaporation reactor 7 through pipelines, and valves are provided on the pipelines so that the slurry first frozen and crystallized in the freezing reactor 2 enters the first evaporation reactor 4 through one of the pipelines and is evaporated until sodium chloride reaches saturation and then circulated to the freezing reactor 2 for re-freezing crystallization. The slurry after re-freezing crystallization enters the second evaporation reactor 7 through the other pipeline and is evaporated until sodium chloride precipitates, and then centrifuged to obtain high-purity sodium chloride. Through the cyclic treatment of this system, a small amount of sodium sulfate contained in sodium chloride can be recycled and crystallized again, improving the purity of the final by-product sodium chloride.

[0052] Or, as Figure 3As shown, the processing system includes a wastewater storage tank 1 for collecting and storing the concentrated wastewater from the lithium phosphate production line, a freezing reactor 2 connected to the wastewater storage tank 1, and a water-cooling device 11 supporting the freezing reactor 2. The concentrated wastewater is subjected to low-temperature crystallization in the freezing reactor 2 to obtain most of the mirabilite crystals. The discharge end of the freezing reactor 2 is connected to the feed end of the first centrifugation device 3. The slurry containing mirabilite crystals obtained in the freezing reactor 3 is pumped into the first centrifugation device 3 to separate the mirabilite. The mirabilite separated by the first centrifugation device 3 enters the dissolution and re-evaporation crystallization production line to obtain a by-product sodium sulfate without obvious caking. That is, the crystal discharge end of the first centrifugation device 3 is connected to the mirabilite dissolution tank 9 for dissolving the mirabilite, and the discharge port of the mirabilite dissolution tank 9 is further connected to the MVR device 10 to obtain a by-product sodium sulfate with high purity. The slurry discharge end of the first centrifugation device 3 is then connected to the first evaporation reactor 4. The frozen slurry is heated in the first evaporation reactor 4 to evaporate the excess water until the sodium chloride is saturated. The slurry processed by the first evaporation reactor 4 then enters the nanofiltration device 8 connected thereto to intercept the small amount of sodium sulfate contained in the slurry, obtaining a pure sodium chloride slurry, and further evaporating, concentrating and crystallizing in the concentration reactor 12 connected to the sodium chloride discharge port of the nanofiltration device 8 to obtain a sodium chloride by-product. The small amount of intercepted sodium sulfate slurry is circulated through the discharge port of the nanofiltration device 8 through a pipeline into the mirabilite dissolution tank 9 for dissolution.

[0053] Or, for example Figure 4As shown in the figure, the processing system includes a wastewater storage tank 1 for collecting and storing the concentrated water liquid of the lithium phosphate production line, a freezing reactor 2 connected to the wastewater storage tank 1, and a water cooling device 11 supporting the freezing reactor 2. The concentrated water liquid is subjected to low-temperature crystallization through the freezing reactor 2 to obtain most of the mirabilite crystals. The discharge end of the freezing reactor 2 is connected to the feed end of the first centrifugation device 3. The slurry containing mirabilite crystals obtained in the freezing reactor 2 is pumped into the first centrifugation device 3 to separate the mirabilite. The mirabilite separated by the first centrifugation device 3 enters the dissolution and re-evaporation crystallization production line to obtain a by-product sodium sulfate without obvious caking. That is, the crystal discharge end of the first centrifugation device 3 is connected to the mirabilite dissolution tank 9 for dissolving mirabilite, and the discharge port of the mirabilite dissolution tank 9 is further connected to the MVR device 10 to obtain a high-purity by-product sodium sulfate. The slurry discharge end of the first centrifugation device 3 is connected to a nanofiltration device to intercept the sodium sulfate in the slurry containing a small amount of sodium sulfate. The sodium chloride slurry discharge port of the nanofiltration device 8 is connected to the first evaporation reactor 4. The intercepted slurry is heated through the first evaporation reactor 4 to evaporate the excess water until sodium chloride is precipitated. The sodium sulfate slurry discharge port of the nanofiltration device 8 is recycled into the mirabilite dissolution tank 9 through a pipeline. The slurry processed by the first evaporation reactor 4 then enters the second centrifugation device 5 connected thereto for solid-liquid separation to obtain pure sodium chloride and slurry. The slurry obtained by the second centrifugation device 5 enters the liquid storage tank 6 and can be further recycled into the first evaporation reactor 4 through a pipeline for cyclic evaporation treatment until pure sodium chloride is obtained.

[0054] Through the above processing system of the present utility model, the small amount of sodium sulfate contained in the sodium chloride slurry can be further processed, thereby obtaining a high-purity sodium chloride by-product with a purity of over 98%.

[0055] In addition to the above, each component of the present utility model is connected by pipelines, and corresponding extraction pumps can be set on the pipelines according to requirements, which are all well-known technical means in the art. For the evaporation mentioned in the present utility model until the sodium chloride slurry reaches saturation, that is, the sodium chloride concentration in the concentrated liquid reaches 390 g / L, or until the sodium chloride slurry reaches precipitation, that is, the liquid is concentrated 3 - 4 times.

Claims

1. A system for treating concentrated liquid from a lithium phosphate production line, characterized in that, The processing system includes: Wastewater storage tank (1) is used to collect and store the concentrated liquid from the lithium phosphate production line; The refrigerated reactor (2) is connected to the discharge end of the wastewater storage tank (1) to cool the concentrated water liquid and achieve low-temperature crystallization of sodium sulfate. The first centrifuge device (3) is connected to the discharge end of the refrigerated reactor (2) to achieve solid-liquid separation in the refrigerated reactor (2) and obtain sodium sulfate crystals and slurry. The first evaporation reactor (4) is connected to the slurry discharge end of the first centrifugal device (3) to evaporate excess water in the slurry until sodium chloride precipitates out, thus obtaining new slurry; The second centrifugal device (5) is connected to the discharge end of the first evaporation reactor (4) to achieve solid-liquid separation of the slurry obtained in the first evaporation reactor (4) and obtain mixed salts and new slurry. The liquid storage tank (6) has its feed end connected to the slurry discharge end of the second centrifuge device (5), and its discharge end is connected to the feed end of the first evaporation reactor (4) through a pipeline.

2. A system for treating concentrated liquid from a lithium phosphate production line, characterized in that, The processing system includes: Wastewater storage tank (1) is used to collect and store the concentrated liquid from the lithium phosphate production line; The refrigerated reactor (2) is connected to the discharge end of the wastewater storage tank (1) to cool the concentrated water liquid and achieve low-temperature crystallization of sodium sulfate. The first centrifuge device (3) is connected to the discharge end of the refrigerated reactor (2) to achieve solid-liquid separation in the refrigerated reactor (2) and obtain sodium sulfate crystals and slurry. The first evaporation reactor (4) is connected to the slurry discharge end of the first centrifugal device (3) to evaporate excess water in the slurry until sodium chloride reaches saturation, thus obtaining a new slurry; the discharge end of the first evaporation reactor (4) is circulated to the freezing reactor (2) through a pipeline so that the new slurry is circulated and frozen to crystallize. The second evaporation reactor (7) is connected to the discharge end of the slurry after circulating freeze crystallization of the first centrifuge device (3) to evaporate excess water in the slurry obtained by circulating freeze crystallization until sodium chloride precipitates, and to obtain new slurry. The second centrifugal device (5) is connected to the discharge end of the second evaporation reactor (7) to achieve solid-liquid separation of the slurry obtained in the second evaporation reactor (7) and obtain high-purity sodium chloride and new slurry. The liquid storage tank (6) is connected to the slurry discharge end of the second centrifuge (5) through the feed end, and its discharge end is connected to the feed end of the second evaporation reactor (7) through a pipeline for cyclic evaporation and crystallization.

3. A system for treating concentrated liquid from a lithium phosphate production line, characterized in that, The processing system includes: Wastewater storage tank (1) is used to collect and store the concentrated liquid from the lithium phosphate production line; The refrigerated reactor (2) is connected to the discharge end of the wastewater storage tank (1) to cool the concentrated liquid and achieve low-temperature crystallization of sodium sulfate; The first centrifuge device (3) is connected to the discharge end of the refrigerated reactor (2) to achieve solid-liquid separation in the refrigerated reactor (2) and obtain sodium sulfate crystals and slurry. The first evaporation reactor (4) is connected to the slurry discharge end of the first centrifugal device (3) to evaporate excess water in the slurry until sodium chloride is saturated, thus obtaining a new slurry. The nanofiltration device (8) is connected at the feed end to the discharge end of the first evaporation reactor (4) to intercept sodium sulfate in the slurry and obtain pure sodium chloride slurry; The concentration reactor (12) is connected to the sodium chloride slurry outlet of the nanofiltration equipment (8) to concentrate sodium chloride.

4. A system for treating concentrated liquid from a lithium phosphate production line, characterized in that, The processing system includes: Wastewater storage tank (1) is used to collect and store the concentrated liquid from the lithium phosphate production line; The refrigerated reactor (2) is connected to the discharge end of the wastewater storage tank (1) to cool the concentrated liquid and achieve low-temperature crystallization of sodium sulfate; The first centrifuge device (3) is connected to the discharge end of the refrigerated reactor (2) to achieve solid-liquid separation in the refrigerated reactor and obtain sodium sulfate crystals and slurry. The nanofiltration device (8) is connected at the feed end to the discharge end of the first centrifuge (3) to intercept sodium sulfate in the slurry and obtain pure sodium chloride slurry; The first evaporation reactor (4) is connected to the sodium chloride slurry discharge end of the nanofiltration equipment (8) to evaporate excess water in the sodium chloride slurry until sodium chloride precipitates out, thus obtaining a new slurry. The second centrifugal device (5) is connected to the discharge end of the first evaporation reactor (4) to achieve solid-liquid separation of the slurry obtained in the first evaporation reactor (4) and obtain high-purity sodium chloride and new slurry. The liquid storage tank (6) is connected to the slurry discharge end of the second centrifuge (5) through the feed end, and its discharge end is connected to the feed end of the first evaporation reactor (4) through a pipeline for evaporation and crystallization.

5. The treatment system for concentrated liquid from a lithium phosphate production line according to any one of claims 1 to 4, characterized in that, The first centrifugal device (3) is also connected in sequence to the sodium sulfate dissolving tank (9) and the MVR device (10) at the sodium sulfate crystal discharge end.

6. The lithium phosphate production line concentrated liquid treatment system according to claim 5, characterized in that, The sodium sulfate outlet of the nanofiltration device (8) is circulated through a pipeline to the feed end of the sodium sulfate dissolving tank (9).

7. The treatment system for concentrated liquid from a lithium phosphate production line according to any one of claims 1 to 4, characterized in that, The processing system also includes a water cooling device (11) that provides circulating cooling water to the refrigerated reactor (2).

8. The treatment system for concentrated liquid from a lithium phosphate production line according to any one of claims 1 to 4, characterized in that, The processing system also includes a steam generating device for supplying steam to the evaporation reactor.

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