Lithium fluoride treatment system

Abstract

The utility model provides a lithium fluoride treatment system which is used for washing, filtering and drying lithium fluoride and comprises a washing filter, a vibration dryer and a vacuum pump set. The washing filter is integrated by a washer and a filter, and the washing filter is used for washing and filtering lithium fluoride slurry. The vibration dryer is connected to the washing filter, the vibration dryer comprises a closed drying cavity and a heater, lithium fluoride vibrates in the closed drying cavity to form a plurality of crushed aggregates, and the heater is used for heating the closed drying cavity. The vacuum pump set is connected to the vibration dryer so as to provide a negative pressure environment for the closed drying cavity. The lithium fluoride treatment system can be used for effectively washing, filtering and drying a lithium fluoride product, so that the content of moisture and impurities in the lithium fluoride product is reduced, and the lithium fluoride product can meet the quality requirements of a battery production process and the like.

Description

Technical Field

[0001] This application relates to the field of lithium fluoride production technology, and particularly to a lithium fluoride processing system. Background Technology

[0002] Lithium fluoride is commonly used in the production of lithium salts (lithium hexafluorophosphate) required for lithium batteries. Battery-grade lithium fluoride products have high quality requirements, including low water content. Currently, the mainstream process for producing battery-grade lithium fluoride involves carbonizing lithium carbonate to generate highly soluble lithium bicarbonate. The purified lithium bicarbonate is then neutralized with an aqueous solution of hydrogen fluoride in a reactor to obtain a lithium fluoride slurry. After purification, a qualified battery-grade lithium fluoride product is obtained.

[0003] The existing purification process involves washing, filtering, drying, and then sieving the lithium fluoride slurry. Centrifugal filters are commonly used in this process, but they are energy-intensive and require a large footprint. Belt dryers or screw dryers are commonly used for drying, but these dryers have low heat transfer efficiency, long drying times, high heat consumption, and produce products with high moisture content after drying, making it difficult to meet the moisture content requirements for lithium battery applications. Furthermore, the dried lithium fluoride product from existing technologies often suffers from powder agglomeration, complicating subsequent sieving processes. Additionally, belt dryers and screw dryers have high failure rates and are prone to leakage in their mechanical seals. Utility Model Content

[0004] This application is made in view of the aforementioned state of the prior art. The purpose of this application is to provide a lithium fluoride processing system that can wash, filter, and dry lithium fluoride to reduce the moisture and impurity content in lithium fluoride products.

[0005] This application provides a lithium fluoride processing system for washing, filtering, and drying lithium fluoride, comprising a washing filter, a vibrating dryer, and a vacuum pump assembly.

[0006] The washing filter is a single unit comprising a washer and a filter, and is used to wash and filter the lithium fluoride slurry.

[0007] The vibratory dryer is connected to the washing filter. The vibratory dryer includes a sealed drying chamber and a heater. Lithium fluoride vibrates within the sealed drying chamber to form several fragments. The heater is used to heat the sealed drying chamber.

[0008] The vacuum pump assembly is connected to the vibrating dryer to provide a negative pressure environment to the sealed drying chamber.

[0009] In at least one possible implementation, the washing filter includes a vessel body, a filter screen, and one or more nozzles, wherein the filter screen and the nozzles are disposed inside the vessel body;

[0010] And / or, the vibratory dryer is provided with an exhaust gas filter, and the lithium fluoride treatment system further includes an exhaust gas condenser and a gas-liquid separator, the exhaust gas condenser being connected to the exhaust gas filter and the gas-liquid separator being connected to the exhaust gas condenser to treat the exhaust gas generated by the vibratory dryer.

[0011] In at least one possible implementation, the heater includes a dryer jacket capable of being filled with a heat exchange medium.

[0012] In at least one possible implementation, the lithium fluoride treatment system further includes steam lines and condensate lines.

[0013] The steam pipeline is connected to the dryer jacket to introduce steam into the dryer jacket as a heat exchange medium.

[0014] The condensate line is connected to the dryer jacket to discharge the condensate formed by the condensation of steam.

[0015] In at least one possible implementation, the steam pipeline is equipped with a vortex flow meter and a regulating valve to measure and regulate the steam flow rate.

[0016] In at least one possible implementation, the lithium fluoride treatment system further includes a nitrogen line connected to the vibrating dryer to charge the vibrating dryer with nitrogen.

[0017] In at least one possible implementation, the lithium fluoride treatment system further includes a circulating inlet line and a circulating outlet line.

[0018] The circulating water inlet pipeline and the circulating water outlet pipeline are respectively connected to the dryer jacket to introduce and discharge circulating water into the dryer jacket.

[0019] In at least one possible implementation, the lithium fluoride treatment system further includes a pure water pipeline.

[0020] The washing filter includes a plurality of nozzles, which are evenly or symmetrically arranged on the inner top of the vessel body.

[0021] The nozzle is connected to the pure water pipeline to spray pure water into the washing filter, thereby washing the material.

[0022] In at least one possible implementation, the vibratory dryer is further provided with one or more pressure transmitters and one or more temperature transmitters to measure and provide feedback on the pressure and temperature within the vibratory dryer.

[0023] And / or, the vacuum pump assembly includes a fluorine-lined water ring vacuum pump.

[0024] In at least one possible implementation, the pure water pipeline is equipped with a temperature monitoring meter to detect the temperature of the pure water so that the temperature of the pure water is maintained between 60 and 80 degrees Celsius.

[0025] The washing filter is equipped with a pH meter to detect the pH of the lithium fluoride slurry so that the pH of the washed and filtered lithium fluoride slurry is between 6.0 and 8.5.

[0026] This application provides a lithium fluoride processing system, comprising a washing filter and a vibrating dryer. This system effectively washes, filters, and dries lithium fluoride products, reducing moisture and impurity content and enabling the products to meet quality requirements, such as those in battery manufacturing processes. Compared to belt dryers, the vibrating dryer breaks up agglomerated or clump-like materials through continuous vibration, increasing the surface area for drying and improving heat transfer uniformity. This allows for rapid and efficient removal of moisture and thorough drying. The material breaking down in the vibrating dryer reduces or saves time in subsequent sieving and packaging processes, thereby increasing production line capacity. Compared to belt dryers, the vibrating dryer shortens drying time and reduces heat consumption. The vibrating dryer uses a closed drying chamber, preventing residual hydrogen fluoride and other substances from escaping during drying. Dust generated by vibration is also effectively removed, reducing environmental pollution. Attached Figure Description

[0027] Figure 1 This is a simplified structural diagram of a lithium fluoride treatment system according to one embodiment of this application.

[0028] Explanation of reference numerals in the attached figures

[0029] 10 Washing Filter

[0030] 11. Kettle body

[0031] 12. Stirring device

[0032] 13 motors

[0033] 14 Discharge valve

[0034] 15 nozzles

[0035] 20 Vibrating Dryer

[0036] 21 Dryer Jacket

[0037] 22 Discharge valve

[0038] 23 Pressure transmitter

[0039] 24 Temperature Transmitter

[0040] 25 Exhaust filter

[0041] 30 Exhaust Gas Condenser

[0042] 40 Gas-Liquid Separator

[0043] 50 Vacuum Pump Set

[0044] 61 Pure water pipeline

[0045] 62 Nitrogen pipeline

[0046] 63. Circulating water inlet pipeline

[0047] 64. Circulating water outlet pipeline

[0048] 65 Steam pipeline

[0049] 651 Vortex Flow Meter

[0050] 652 Control Valve

[0051] 66 Condensate drain line Detailed Implementation

[0052] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0053] Embodiments of this application provide a lithium fluoride processing system (hereinafter, sometimes simply referred to as the "processing system"), such as Figure 1 As shown, the processing system may include a washing filter 10, a vibration dryer 20, an exhaust gas condenser 30, a gas-liquid separator 40, and a vacuum pump set 50.

[0054] Specifically, the washing filter 10 integrates the washing unit and the filter into one unit, enabling it to both wash and filter lithium fluoride (slurry). Compared to existing technologies that separate the washing and filtration processes into different devices, this effectively reduces equipment costs and floor space. Figure 1As shown, the washing filter 10 may include a vessel body 11, a stirring device 12, a motor 13, a discharge valve 14, and a nozzle 15. The stirring device 12 may be located inside the vessel body 11, and the motor 13 may be located outside the vessel body 11 (particularly on the top surface of the outer side of the vessel body 11). The stirring device 12 may be connected to the motor 13. The motor 13 can drive the stirring device 12 to rotate inside the vessel body 11 to stir the material (lithium fluoride slurry). The nozzle 15 may be located inside the vessel body 11, particularly at the inner top, to spray washing liquid onto the material inside the vessel body 11. The washing liquid sprayed by the nozzle 15 may be pure water, and the nozzle 15 may be connected to a pure water line 61, which can be used to supply pure water for washing to the nozzle 15. The discharge valve 14 may be located at the bottom of the vessel body 11 for discharging the material after washing and filtration. The discharge valve 14 can be connected to the vibratory dryer 20 via a pipe, which can be a vertical or inclined pipe. The lithium fluoride slurry can flow into the vibratory dryer 20 by gravity or be driven into the vibratory dryer 20 by an external force such as a pump. The washing filter 10 can also have a feed valve connected to the lithium fluoride synthesis reactor to deliver lithium fluoride slurry from the lithium fluoride synthesis reactor to the washing filter 10.

[0055] The washing filter 10 may be equipped with a filter screen, which can be used to filter the material inside the washing filter 10 by means of pressure filtration or vacuum filtration. The filter screen may be made of sintered metal mesh, etc.

[0056] Preferably, the washing filter 10 may have multiple nozzles 15, particularly an even number of nozzles 15. The multiple nozzles 15 may be evenly arranged on the inner top of the vessel body 11; the even number of nozzles 15 may be symmetrically distributed on the inner top of the vessel body 11. Each nozzle 15 may be connected to a pure water line 61.

[0057] It is understood that nozzle 15 can also be used to clean the filter screen in the washing filter 10. When the filter screen in the washing filter is clogged by materials, the nozzle can be opened to spray liquid onto the filter screen for cleaning, thereby rinsing away the materials adhering to the surface of the filter screen. The nozzle can rotate to spray liquid (e.g., a spray ball nozzle) to cover the filter screen. In some practical cases, cleaning the filter screen using the nozzle can take one to two hours.

[0058] Preferably, the washing filter 10 may also include a temperature display device and a pressure display device.

[0059] Preferably, the discharge valve 14 can be a ball valve, which is less likely to be stuck by solid materials or cause wear and leakage. The discharge valve 14 can also be a plunger valve.

[0060] Preferably, the washing filter 10 can perform 2 to 3 pure water washes. The temperature of the pure water used for washing can be 60 to 80 degrees Celsius. A temperature monitoring meter can be installed on the pure water pipeline 61 to detect the temperature of the pure water. The temperature monitoring meter can feed back the pure water temperature information to the pure water heating device to maintain the pure water temperature at 60 to 80 degrees Celsius. It is understood that the specific number of washes and the temperature can be determined according to the actual process conditions.

[0061] Preferably, the pH of the lithium fluoride (slurry) after treatment by the washing filter 10 can be between 6.0 and 8.5. A pH meter can be installed inside the washing filter 10 to detect the pH of the lithium fluoride slurry inside the washing filter. Once the pH of the washed and filtered lithium fluoride slurry is detected to be between 6.0 and 8.5, the washing and filtering operation can be terminated and the lithium fluoride slurry can be discharged.

[0062] Preferably, the washing filter 10 can be positioned directly above the vibrating dryer 20, that is, the washing filter 10 can be connected to the vibrating dryer 20 via a vertically arranged pipe, in order to reduce the risk of material clogging the pipe, improve the efficiency of material conveying, and reduce the number of material conveying devices.

[0063] The vibrating dryer 20 uses a vibrating motor to generate excitation force, causing the material to be dried to move forward under the action of the excitation force in a given direction, while the heating tube heats the drying medium. During operation, the vibrating dryer 20 continuously vibrates to break up agglomerated and clump-like materials, increasing the surface area for heating and drying, improving the uniformity of heat transfer, and enabling the material to quickly and efficiently remove moisture and achieve thorough drying. The material crushing effect of the vibrating dryer also allows for preliminary pulverization of the material, reducing or saving time in subsequent screening and packaging processes, thereby increasing the production line's capacity. Compared to belt dryers, vibrating dryers can shorten drying time and reduce heat consumption when drying lithium fluoride products. Furthermore, unlike belt dryers, vibrating dryers do not have a transmission device connected to an external motor, further improving the sealing of the drying chamber. The vibrating dryer can use a sealed drying chamber, preventing residual hydrogen fluoride and other substances in the lithium fluoride slurry from easily escaping during the drying process. Dust generated by vibration can also be effectively removed, reducing environmental pollution. Furthermore, the absence of a transmission device in the vibrating dryer avoids the introduction of metallic impurities into the material due to friction between the transmission device and the equipment structure or material during operation. The vibrating dryer also has fewer hard-to-clean areas within its cavity, making it easier to clean.

[0064] Specifically, such as Figure 1As shown, the vibrating dryer 20 is connected to the washing filter 10. The vibrating dryer 20 may include a sealed drying chamber and a heater. Lithium fluoride vibrates within the sealed drying chamber to form several fragments. The heater is used to heat the sealed drying chamber. Exemplarily, the heater may include an electric heater, a jacketed heater, or a coil heater, etc. Preferably, the vibrating dryer 20 may include a dryer jacket 21 disposed outside the vibrating dryer 20 and a sealed drying chamber disposed inside the vibrating dryer 20. The dryer jacket 21 may be filled with a heat exchange medium for heat exchange in the vibrating dryer 20. The dryer jacket 21 may be connected to a circulating water inlet line 63, a circulating water outlet line 64, a steam line 65, and a condensate line 66, etc. The steam line 65 may be used to introduce steam into the dryer jacket 21 as a heat exchange medium to heat the material in the sealed drying chamber of the vibrating dryer 20. The condensate line 66 may be used to discharge the condensate formed after the steam from the steam line 65 is condensed. The steam line 65 can be installed in the upper part (particularly the top) of the dryer jacket 21, and the condensate line can be installed in the lower part (particularly the bottom) of the dryer jacket 21. The steam line 65 can be equipped with a vortex flow meter 651 for measuring the steam flow rate of the steam line 65. The steam line 65 can also be equipped with a regulating valve 652 for regulating the steam velocity of the steam line 65.

[0065] Alternatively, the dryer jacket can use other heat exchange media, such as heat transfer oil or flue gas. That is, steam line 65 can also be replaced by other heat transfer medium lines, such as heat transfer oil lines or flue gas lines.

[0066] The circulating water inlet pipe 63 and the circulating water outlet pipe 64 can be used to introduce and discharge cooling water into the dryer jacket 21, so that the vibrating dryer 20 can be quickly cooled during maintenance and other operations. The circulating water inlet pipe 63 can be set in the lower part (especially the bottom) of the dryer jacket 21, and the circulating water outlet pipe 64 can be set in the upper part (especially the top) of the dryer jacket, that is, the form of water inlet at the bottom and water outlet at the top can improve the heat exchange efficiency of the cooling water.

[0067] A discharge valve 22 can be installed at the bottom of the vibrating dryer 20 to allow the dried material to pass into downstream processes. Preferably, the discharge valve 22 can be a rotary discharge valve.

[0068] The vibrating dryer 20 can also be connected to a nitrogen line 62, used to introduce nitrogen into the vibrating dryer 20 before the drying operation to replace the gas inside the vibrating dryer 20 (to prevent oxygen and other gases inside the vibrating dryer from affecting the material). The vibrating dryer 20 can also be equipped with one or more pressure transmitters 23 and one or more temperature transmitters 24, used to measure and provide feedback on the pressure and temperature inside the vibrating dryer 20, respectively. Optionally, a temperature transmitter 24 can also be installed on the circulating water line 64.

[0069] Vacuum pump unit 50 can be directly or indirectly connected to vibratory dryer 20 to maintain a vacuum or negative pressure state inside vibratory dryer 20, so that the moisture in the material (lithium fluoride slurry) can evaporate quickly, further reducing the moisture content of lithium fluoride products. Vibratory dryer 20 can be equipped with exhaust gas filter 25, which can have a dust filtration structure such as dust filter cloth or sintered metal mesh to filter out trace amounts of solid powder contained in the exhaust gas (including water vapor generated during material drying).

[0070] The exhaust gas filter 25 can be connected in sequence to the exhaust gas condenser 30 and the gas-liquid separator 40. The exhaust gas generated by the vibrating dryer 20 during material drying (including water vapor generated during material drying) can enter the exhaust gas condenser 30 through the exhaust gas filter 25 and be condensed in the exhaust gas condenser 30 to form exhaust gas condensate. The exhaust gas condensate can be collected in the gas-liquid separator 40 and then further discharged into downstream processes, such as waste liquid treatment processes.

[0071] The vacuum pump unit 50 can be connected to the vibrating dryer 20 via the gas-liquid separator 40, the exhaust gas condenser 30 and the exhaust gas filter 25, which can maintain the negative pressure environment inside the vacuum dryer while drawing in the exhaust gas.

[0072] Preferably, the vacuum pump assembly 50 may include a water ring vacuum pump or a dry screw vacuum pump. More preferably, the vacuum pump assembly may include a fluoropolymer-lined water ring vacuum pump, which has excellent corrosion resistance, can prevent substances such as hydrogen fluoride from corroding the pump body, and has a lower cost.

[0073] Preferably, the temperature inside the vibrating dryer 20 can be maintained at 130 to 150 degrees Celsius.

[0074] Preferably, the pressure inside the vibratory dryer 20 can be maintained at -0.1 to -0.08 MPa, and in particular at -0.095 MPa.

[0075] The following is a brief description of the workflow of the lithium fluoride treatment system of this embodiment.

[0076] The lithium fluoride slurry enters the washing filter 10 from the lithium fluoride synthesis reactor. After the feed valve of the washing filter is closed, the stirring device 12 starts the slurrying operation, followed by the initial filtration. After the initial filtration, pure water at 60 to 80 degrees Celsius is added to the lithium fluoride material through nozzle 15 for washing 2 to 3 times, controlling its pH value between 6.0 and 8.5. Multiple washing and / or filtration operations can be performed as needed. The washed and filtered lithium fluoride material can then enter the vibrating dryer 20 through the discharge valve 14.

[0077] Nitrogen gas can be introduced into the vibratory dryer 20 via the nitrogen pipeline for preheating. After the lithium fluoride slurry enters the vibratory dryer 20, steam can be introduced into the dryer jacket via the steam pipeline 65 to heat the vibratory dryer 20. After drying, the material in the vibratory dryer 20 can enter the downstream process via the discharge valve 22.

[0078] According to an experimental example of this embodiment, the impurity content of the lithium fluoride product after washing, filtering, and drying by the lithium fluoride treatment system is shown in the table below:

[0079] Table 1: Impurity Content in Lithium Fluoride Products

[0080] Components Content (percentage by weight, wt%) 1 Lithium fluoride (LiF) ≥99.95 2 Moisture ≤0.02 3 <![CDATA[Sulfate (SO4 2- )]]> ≤0.0020 4 Chlorine (Cl) ≤0.0020 5 Iron (Fe) ≤0.0010 6 Potassium (K) ≤0.0010 7 Sodium(Na) ≤0.0010 8 Calcium (Ca) ≤0.0010 9 Aluminum (Al) ≤0.0010 10 Silicon (Si) ≤0.0050 11 Copper (Cu) ≤0.0005 12 Magnesium (Mg) ≤0.0010

[0081] As shown in Table 1, the water content of the lithium fluoride product dried by this treatment system is less than or equal to 0.02%, and the content of other impurities is also at a low level, meeting the requirements for water and impurity content of battery-grade lithium fluoride products.

[0082] The following is a brief description of some of the beneficial effects of the above-described embodiments of this application.

[0083] The lithium fluoride processing system provided in this embodiment employs a "two-in-one" washing and filtering filter, which reduces equipment costs and space requirements, and minimizes material loss due to the simultaneous washing and filtering within the same device. Compared to the centrifugal filtration equipment commonly used in existing lithium fluoride processing technologies, it consumes less energy and has a higher material throughput. The vibrating dryer continuously vibrates during operation to break up agglomerated and clump-like materials, increasing the surface area for heating and drying, improving the uniformity of heat transfer, and enabling rapid and efficient removal of moisture and thorough drying. The material crushing effect of the vibrating dryer also allows for preliminary pulverization of the material, reducing or saving time in subsequent sieving and packaging processes, thereby increasing the production line's capacity. Compared to belt dryers, vibrating dryers shorten drying time and reduce heat consumption when drying lithium fluoride products. Furthermore, unlike belt dryers, vibrating dryers do not have a transmission device connected to an external motor, further improving the sealing of the drying chamber. The vibratory dryer uses a sealed drying chamber. During the drying process, residual hydrogen fluoride and other substances in the lithium fluoride slurry are less likely to escape from the drying chamber, and the dust generated by vibration can be effectively removed, reducing environmental pollution. Furthermore, the absence of a transmission device in the vibratory dryer avoids the introduction of metallic impurities into the material due to friction between the transmission device and the equipment structure or material. The vibratory dryer has fewer dead corners for cleaning, making it easy to clean. Connecting the vibratory dryer to a vacuum pump unit allows for rapid drying of lithium fluoride materials under negative pressure or vacuum conditions.

[0084] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0085] It should be understood that the above embodiments are merely exemplary and are not intended to limit this application. Those skilled in the art can make various modifications and changes to the above embodiments under the teachings of this application without departing from the scope of this application.

Claims

1. A lithium fluoride treatment system for washing, filtering, and drying lithium fluoride, characterized in that, Includes a washing filter, a vibratory dryer, and a vacuum pump unit. The washing filter is a single unit comprising a washer and a filter, and is used to wash and filter the lithium fluoride slurry. The vibratory dryer is connected to the washing filter. The vibratory dryer includes a sealed drying chamber and a heater. Lithium fluoride vibrates within the sealed drying chamber to form several fragments. The heater is used to heat the sealed drying chamber. The vacuum pump assembly is connected to the vibrating dryer to provide a negative pressure environment to the sealed drying chamber.

2. The lithium fluoride treatment system according to claim 1, characterized in that, The washing filter includes a vessel body, a filter screen, and one or more nozzles, wherein the filter screen and the nozzles are disposed inside the vessel body; And / or, the vibratory dryer is provided with an exhaust gas filter, and the lithium fluoride treatment system further includes an exhaust gas condenser and a gas-liquid separator, the exhaust gas condenser being connected to the exhaust gas filter and the gas-liquid separator being connected to the exhaust gas condenser to treat the exhaust gas generated by the vibratory dryer.

3. The lithium fluoride treatment system according to claim 1, characterized in that, The heater includes a dryer jacket, which can be filled with a heat exchange medium.

4. The lithium fluoride treatment system according to claim 3, characterized in that, It also includes steam pipelines and condensate pipelines. The steam pipeline is connected to the dryer jacket to introduce steam into the dryer jacket as a heat exchange medium. The condensate line is connected to the dryer jacket to discharge the condensate formed by the condensation of steam.

5. The lithium fluoride treatment system according to claim 4, characterized in that, The steam pipeline is equipped with a vortex flow meter and a regulating valve to measure and regulate the steam flow rate.

6. The lithium fluoride treatment system according to claim 1, characterized in that, It also includes nitrogen pipelines, The nitrogen pipeline is connected to the vibrating dryer to fill the vibrating dryer with nitrogen.

7. The lithium fluoride treatment system according to claim 3, characterized in that, It also includes circulating water inlet pipelines and circulating water outlet pipelines. The circulating water inlet pipeline and the circulating water outlet pipeline are respectively connected to the dryer jacket to introduce and discharge circulating water into the dryer jacket.

8. The lithium fluoride treatment system according to claim 2, characterized in that, The lithium fluoride treatment system also includes a pure water pipeline. The washing filter includes a plurality of nozzles, which are evenly or symmetrically arranged on the inner top of the vessel body. The nozzle is connected to the pure water pipeline to spray pure water into the washing filter, thereby washing the material.

9. The lithium fluoride treatment system according to claim 1, characterized in that, The vibratory dryer is also equipped with one or more pressure transmitters and one or more temperature transmitters to measure and provide feedback on the pressure and temperature inside the vibratory dryer. And / or, the vacuum pump assembly includes a fluorine-lined water ring vacuum pump.

10. The lithium fluoride treatment system according to claim 8, characterized in that, The pure water pipeline is equipped with a temperature monitoring meter to detect the temperature of the pure water and keep the temperature of the pure water between 60 and 80 degrees Celsius. The washing filter is equipped with a pH meter to detect the pH of the lithium fluoride slurry so that the pH of the washed and filtered lithium fluoride slurry is between 6.0 and 8.5.

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