Process method for preparing fine battery-grade lithium hydroxide monohydrate and preparation device thereof

Abstract

The application provides a process method and a preparation device of fine powder battery-grade monohydrate lithium hydroxide. The process method of the fine powder battery-grade monohydrate lithium hydroxide comprises the following steps: S1, lithium mica and sulfate are calcined and transformed at a mass ratio of 1.3-2.5:1, a temperature of 800-1200 degrees, and for 0.5-2 hours, and then cooled to room temperature to obtain calcined clinker; the calcined clinker and water are ball milled and leached at a ratio of 2-0.5:1 to obtain a slurry of lithium sulfate solution. The process method and the preparation device of the fine powder battery-grade monohydrate lithium hydroxide provided by the application reduce the process steps of obtaining monohydrate lithium hydroxide from lithium mica ore, and the intermediate does not need to pass through the process of other lithium salts such as lithium carbonate deposition to be converted into lithium hydroxide again; the preparation process of the monohydrate lithium hydroxide is simplified, the production cost is reduced, the product quality is stabilized, and the product yield is improved.

Description

Technical Field

[0001] This invention relates to the field of lithium hydroxide monohydrate technology, and in particular to a process method and preparation apparatus for micronized battery-grade lithium hydroxide monohydrate. Background Technology

[0002] Basic lithium salt products such as lithium carbonate and lithium hydroxide are widely used in dyes, chemical raw materials, glass manufacturing, ceramics, food, semiconductors, national defense, nuclear energy, catalysts and other fields. Battery-grade lithium hydroxide can be used to prepare ternary materials and lithium iron phosphate and other lithium-ion battery cathode materials. High-purity lithium hydroxide monohydrate is not only used in high-end lithium-ion battery cathode materials and battery-grade lithium fluoride, but also widely used in optoelectronic information, and can be used to prepare special optical glass, magnetic materials, supercapacitors and the pharmaceutical industry. With the continuous innovation and development of lithium salt materials, their application in various fields will become increasingly widespread.

[0003] Lithium carbonate and lithium hydroxide are important raw materials for synthesizing high-energy-density ternary cathode materials. When using lithium carbonate as a raw material, the sintering temperature of high-nickel ternary materials cannot exceed 800℃. If the sintering temperature is too low, lithium carbonate will decompose incompletely, increase alkalinity, and cause lithium source loss, affecting battery performance. Micronized battery-grade lithium hydroxide monohydrate can effectively avoid the defects of lithium carbonate and improve the performance of ternary cathode materials. As the development of high-nickel ternary cathode materials continues to accelerate and high-nickel ternary materials are being applied on a large scale in power batteries, the demand for micronized battery-grade lithium hydroxide monohydrate will continue to increase.

[0004] Current literature and patents mainly disclose the following methods for producing lithium hydroxide monohydrate: In CN200710051016, the lithium sulfate purification solution requires the addition of sodium hydroxide followed by freezing to obtain a lithium hydroxide solution. This lithium hydroxide solution has very high sodium and sulfate content, resulting in high energy consumption in the freezing process and a tendency for sodium and sulfate levels to exceed acceptable limits. CN202110295000 requires industrial-grade lithium carbonate as a raw material to prepare lithium hydroxide monohydrate. Currently, the price of industrial-grade lithium carbonate exceeds that of battery-grade lithium hydroxide monohydrate, making the process too costly. CN111170342 A discloses a method for preparing battery-grade lithium hydroxide from industrial-grade lithium hydroxide. This method is simple but costly.

[0005] At present, lithium hydroxide monohydrate still has the following problems: (1) The raw materials are limited. At present, battery-grade lithium hydroxide monohydrate is mainly prepared from spodumene, lithium carbonate or industrial-grade lithium hydroxide. There is no process technology to directly prepare lithium hydroxide monohydrate from lepidolite; (2) The preparation method of freezing after causticization is the mainstream, but this method has high energy consumption, high product impurities, and easy quality fluctuations; (3) The equipment used to prepare lithium hydroxide monohydrate is not flexible, which leads to the staff to adopt multi-step operation, making the preparation process cumbersome.

[0006] Therefore, it is necessary to provide a process and apparatus for producing micronized battery-grade lithium hydroxide monohydrate to solve the above-mentioned technical problems. Summary of the Invention

[0007] This invention provides a process and apparatus for preparing micronized battery-grade lithium hydroxide monohydrate, which solves the problems of high energy consumption, high product impurities, easy quality fluctuations, and poor equipment flexibility in the process.

[0008] To solve the above technical problems, the present invention provides a process for producing micronized battery-grade lithium hydroxide monohydrate, comprising the following steps:

[0009] S1. Lithium mica and sulfate are roasted at a mass ratio of 1.3-2.5:1 at a temperature of 800-1200 degrees Celsius for 0.5-2 hours, and then cooled to room temperature to obtain roasted clinker. The roasted clinker and water are ball-milled and leached at a ratio of 2-0.5:1 to obtain a slurry of lithium sulfate solution.

[0010] S2. The slurry of the obtained lithium sulfate solution is subjected to liquid-solid separation through a preparation device to obtain lithium sulfate solution and lithium-containing silica sand. The obtained lithium sulfate solution is introduced back into the preparation device, and calcium oxide or sodium hydroxide is added to adjust the pH value to 11-13. The solution is then subjected to liquid-solid separation again through the preparation device to obtain purified lithium sulfate solution.

[0011] S3. The obtained lithium sulfate purified solution is further introduced into the preparation device, and ion exchange resin is added to it to remove cations such as calcium and magnesium and to separate solid and liquid to obtain lithium sulfate purified solution. The obtained lithium sulfate purified solution is introduced into the preparation device again, and barium hydroxide is added for stirring and reaction to obtain barium sulfate and lithium hydroxide solution.

[0012] S4. The obtained lithium hydroxide solution is evaporated and concentrated, cooled and filtered to obtain crude lithium hydroxide monohydrate. The crude lithium hydroxide monohydrate is redissolved and filtered through a preparation device to remove insoluble impurities to obtain a heavy lithium hydroxide solution. The obtained heavy lithium hydroxide solution is further evaporated and concentrated, cooled and filtered to separate the wet lithium hydroxide monohydrate.

[0013] S5. The obtained wet lithium hydroxide monohydrate material is dried, pulverized and packaged to obtain micronized battery-grade lithium hydroxide monohydrate.

[0014] Preferably, the sulfate in S1 is one or a combination of sodium sulfate, potassium sulfate, calcium sulfate, ferric sulfate, aluminum sulfate, magnesium sulfate, and barium sulfate; the ion exchange resin in S3 is a cation exchange resin; the purified lithium sulfate solution in S3 reacts with the lithium sulfate to barium hydroxide in a molar ratio of 0.9-1.1:1; both the heavy lithium hydroxide solution and the lithium hydroxide solution in S4 are evaporated and concentrated to a solid content of 5-30%, and then cooled to 30-50°C.

[0015] Preferably, in step S4, the solid content is concentrated to 10-20%.

[0016] Preferably, in step S4, the crude lithium hydroxide monohydrate is re-dissolved at a liquid-to-solid ratio of 5-15:1, and the liquid-to-solid ratio of the crude lithium hydroxide monohydrate is preferably 8-12:1; in step S5, the drying temperature of the lithium hydroxide monohydrate is 50-90℃, preferably 60-70℃; and in step S5, the particle size of the lithium hydroxide monohydrate is pulverized to a D50 between 3-8 micrometers.

[0017] This invention also provides a preparation apparatus for micronized battery-grade lithium hydroxide monohydrate, including a reaction vessel, a support frame installed at the bottom of the reaction vessel, a collection tank installed at the bottom of the support frame, a stirring shaft installed inside the reaction vessel, the stirring shaft being hollow inside, an L-shaped plate fixedly connected to the top of the reaction vessel, a sliding plate slidably connected to the L-shaped plate, a driving component mounted on the sliding plate, a driving rod mounted on the output shaft of the driving component, the driving rod passing through and sleeved with the stirring shaft, and a positioning block fixedly connected to the bottom of the driving rod. An automatic push rod is installed between the mold plate and the sliding plate. The automatic push rod is used to push the sliding plate to move linearly up and down. The top and bottom of the reactor are respectively provided with a first feed chute and a first discharge chute. The top and bottom of the collection tank are respectively provided with a second feed chute and a second discharge chute. A rotary opening and closing assembly is provided on the right side of the reactor. The rotary opening and closing assembly is used to control the opening and closing of the first discharge chute. A connecting assembly is installed on the top of the collection tank. A filter assembly is installed on the connecting assembly. The filter assembly is used to separate the solid and liquid components of the material discharged from the first discharge chute.

[0018] Preferably, the rotating opening and closing assembly includes a support block, a rotating cylinder, a sliding groove, a sealing plate, a through hole, a connecting rod, and a slider. The support block is fixedly connected to one side of the reactor. The top of the rotating cylinder is rotatably connected to the bottom of the support block. The sliding groove is formed on the outer surface of the rotating cylinder. The sealing plate is fixedly connected to the bottom of the rotating cylinder and is in close contact with the bottom of the first discharge chute. The through hole is formed on the sealing plate. The top of the connecting rod is fixedly connected to the bottom of the sliding plate. One side of the slider is fixedly connected to the connecting rod, and the other side of the slider slides inside the sliding groove.

[0019] Preferably, the slide includes a first slide and a second slide, which are connected to each other. The first slide is spiral-shaped, and the second slide is vertical.

[0020] Preferably, the connecting assembly includes a fixed shaft, a first rotating shaft, a first transmission gear, a connecting block, a positioning groove, a second rotating shaft, and a second transmission gear. The bottom of the fixed shaft is fixedly connected to the top of the collection pool, the first rotating shaft is rotatably connected to the top of the fixed shaft, the first transmission gear is fixedly connected to the outer surface of the fixed shaft, the connecting block is fixedly connected to the top of the first rotating shaft, the positioning groove is formed on the connecting block, the second rotating shaft is rotatably connected to one side of the first rotating shaft, and the second transmission gear is fixedly connected to the outer surface of the second rotating shaft.

[0021] Preferably, the filter assembly includes an outer cylinder, a filter plate, and an installation assembly. The outer cylinder is fixedly connected to the second rotating shaft, and the filter plate is installed inside the outer cylinder via the installation assembly. The installation assembly includes a support block, a limiting member, and a limiting hole. The support block is fixedly connected to the side wall of the outer cylinder, the limiting hole is opened on the filter plate, and the limiting member is installed on the outer cylinder.

[0022] Preferably, a solid material frame is installed on the top of the collection tank, and a control panel is installed on one side of the reaction vessel.

[0023] Compared with related technologies, the process and preparation apparatus for micronized battery-grade lithium hydroxide monohydrate provided by this invention have the following advantages:

[0024] This invention provides a process and apparatus for producing micronized battery-grade lithium hydroxide monohydrate. By reducing the number of steps in obtaining lithium hydroxide monohydrate from lepidolite ore, and eliminating the need for intermediate processes such as lithium carbonate precipitation to convert it into lithium hydroxide, the process is simplified, reducing production costs and improving product quality stability and yield. Calibration with barium hydroxide prevents the accumulation of sulfate and sodium impurities in the mother liquor, ensuring stable product quality. The barium sulfate byproduct after causticization can also be sold, increasing added value. The generated slag is recycled back to the previous stage, avoiding solid waste generation. Furthermore, the production process eliminates the need for refrigeration, reducing energy consumption and making the process environmentally friendly. The apparatus is adaptable to the process method, increasing flexibility and avoiding a series of cumbersome operations during preparation. Attached Figure Description

[0025] Figure 1 This is a schematic flow chart of a preferred embodiment of the process for producing micronized battery-grade lithium hydroxide monohydrate provided by the present invention.

[0026] Figure 2 This is a schematic diagram of a preferred embodiment of the apparatus for preparing micronized battery-grade lithium hydroxide monohydrate provided by the present invention.

[0027] Figure 3 for Figure 2 A side view of the reactor shown;

[0028] Figure 4 for Figure 2 An exploded view of the rotating opening and closing assembly shown;

[0029] Figure 5 for Figure 3 The enlarged schematic diagram of part A shown below;

[0030] Figure 6 A cross-sectional schematic diagram of the apparatus for preparing micronized battery-grade lithium hydroxide monohydrate provided by the present invention;

[0031] Figure 7 for Figure 6 The enlarged schematic diagram of section B is shown below;

[0032] Figure 8 An initial state diagram of the apparatus for preparing micronized battery-grade lithium hydroxide monohydrate provided by the present invention;

[0033] Figure 9 Solid-liquid separation state diagram of the preparation apparatus for micronized battery-grade lithium hydroxide monohydrate provided by the present invention;

[0034] Figure 10 A diagram showing the solid discharge state of the apparatus for preparing micronized battery-grade lithium hydroxide monohydrate provided by the present invention.

[0035] Numbering on the map:

[0036] 1. Reactor, 2. Support frame, 3. Collection tank, 4. Stirring shaft, 5. L-shaped plate, 6. Sliding plate, 7. Driving component, 8. Driving rod, 9. Positioning block, 10. Automatic push rod, 11. First feed chute, 12. First discharge chute, 13. Second feed chute, 14. Second discharge chute;

[0037] 15. Rotary opening and closing assembly; 151. Support block; 152. Rotary cylinder; 153. Slide groove; 1531. First slide groove; 1532. Second slide groove; 154. Sealing plate; 155. Through hole; 156. Connecting rod; 157. Slider.

[0038] 16. Connecting assembly; 161. Fixed shaft; 162. First rotating shaft; 163. First transmission gear; 164. Connecting block; 165. Positioning groove; 166. Second rotating shaft; 167. Second transmission gear.

[0039] 17. Filter assembly; 171. Outer cylinder; 172. Filter plate; 173. Mounting assembly; 1731. Support block; 1732. Limiting component; 1733. Limiting hole;

[0040] 18. Solid material box; 19. Control panel. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0042] Please refer to the following: Figure 1 , Figure 1 This is a schematic flow chart of a preferred embodiment of the process for producing micronized battery-grade lithium hydroxide monohydrate provided by the present invention.

[0043] This invention provides an apparatus for preparing micronized battery-grade lithium hydroxide monohydrate, comprising the following steps:

[0044] S1. Lithium mica and sulfate are roasted at a mass ratio of 1.3-2.5:1 at a temperature of 800-1200 degrees Celsius for 0.5-2 hours, and then cooled to room temperature to obtain roasted clinker. The roasted clinker and water are ball-milled and leached at a ratio of 2-0.5:1 to obtain a slurry of lithium sulfate solution.

[0045] S2. The slurry of the obtained lithium sulfate solution is subjected to liquid-solid separation through a preparation device to obtain lithium sulfate solution and lithium-containing silica sand. The obtained lithium sulfate solution is introduced back into the preparation device, and calcium oxide or sodium hydroxide is added to adjust the pH value to 11-13. The solution is then subjected to liquid-solid separation again through the preparation device to obtain purified lithium sulfate solution.

[0046] S3. The obtained lithium sulfate purified solution is further introduced into the preparation device, and ion exchange resin is added to it to remove cations such as calcium and magnesium and to separate solid and liquid to obtain lithium sulfate purified solution. The obtained lithium sulfate purified solution is introduced into the preparation device again, and barium hydroxide is added for stirring and reaction to obtain barium sulfate and lithium hydroxide solution.

[0047] S4. The obtained lithium hydroxide solution is evaporated and concentrated, cooled and filtered to obtain crude lithium hydroxide monohydrate. The crude lithium hydroxide monohydrate is redissolved and filtered through a preparation device to remove insoluble impurities to obtain a heavy lithium hydroxide solution. The obtained heavy lithium hydroxide solution is further evaporated and concentrated, cooled and filtered to separate the wet lithium hydroxide monohydrate.

[0048] S5. The obtained wet lithium hydroxide monohydrate material is dried, pulverized and packaged to obtain micronized battery-grade lithium hydroxide monohydrate.

[0049] The sulfate in S1 is one or a combination of sodium sulfate, potassium sulfate, calcium sulfate, ferric sulfate, aluminum sulfate, magnesium sulfate, and barium sulfate; the ion exchange resin in S3 is a cation exchange resin; the purified lithium sulfate solution in S3 reacts with the lithium sulfate and barium hydroxide in a molar ratio of 0.9-1.1:1; both the heavy lithium hydroxide solution and the lithium hydroxide solution in S4 are evaporated and concentrated to a solid content of 5-30%, and then cooled to 30-50°C.

[0050] In step S4, the solid content is preferably 10-20% through evaporation and concentration.

[0051] In step S4, crude lithium hydroxide monohydrate is re-dissolved at a liquid-to-solid ratio of 5-15:1, preferably at a liquid-to-solid ratio of 8-12:1; in step S5, the drying temperature of lithium hydroxide monohydrate is 50-90℃, preferably 60-70℃; and in step S5, the particle size of lithium hydroxide monohydrate is pulverized to a D50 between 3-8 micrometers.

[0052] Compared with related technologies, the process and preparation apparatus for micronized battery-grade lithium hydroxide monohydrate provided by this invention have the following advantages:

[0053] By reducing the number of steps in obtaining lithium hydroxide monohydrate from lepidolite ore, and eliminating the need for intermediate processes such as lithium carbonate precipitation to convert it into lithium hydroxide, the process is simplified, reducing production costs, improving product quality and yield, and ensuring product stability. Calibration with barium hydroxide prevents the accumulation of sulfate and sodium impurities in the mother liquor, resulting in stable product quality. The barium sulfate byproduct after causticization can also be sold, increasing added value. The generated slag is recycled back to the previous stage, avoiding solid waste generation. Furthermore, the production process eliminates the need for refrigeration, reducing energy consumption and making the process environmentally friendly. The preparation equipment is adaptable to the process method, increasing flexibility and avoiding a series of cumbersome operations during preparation.

[0054] Please refer to the following: Figure 2-10 ,in, Figure 2 This is a schematic diagram of a preferred embodiment of the apparatus for preparing micronized battery-grade lithium hydroxide monohydrate provided by the present invention. Figure 3 for Figure 2 A side view of the reactor shown; Figure 4 for Figure 2 An exploded view of the rotating opening and closing assembly shown; Figure 5 for Figure 3 The enlarged schematic diagram of part A shown below; Figure 6 A cross-sectional schematic diagram of the apparatus for preparing micronized battery-grade lithium hydroxide monohydrate provided by the present invention; Figure 7 for Figure 6 The enlarged schematic diagram of section B is shown below; Figure 8 An initial state diagram of the apparatus for preparing micronized battery-grade lithium hydroxide monohydrate provided by the present invention; Figure 9 Solid-liquid separation state diagram of the preparation apparatus for micronized battery-grade lithium hydroxide monohydrate provided by the present invention; Figure 10 A diagram showing the solid discharge state of the apparatus for preparing micronized battery-grade lithium hydroxide monohydrate provided by the present invention.

[0055] This invention also provides an apparatus for preparing micronized battery-grade lithium hydroxide monohydrate, comprising a reaction vessel 1, a support frame 2 installed at the bottom of the reaction vessel 1, a collection tank 3 installed at the bottom of the support frame 2, a stirring shaft 4 installed inside the reaction vessel 1, the interior of the stirring shaft 4 being hollow, an L-shaped plate 5 fixedly connected to the top of the reaction vessel 1, a sliding plate 6 slidably connected to the L-shaped plate 5, a driving component 7 installed on the sliding plate 6, a driving rod 8 installed on the output shaft of the driving component 7, the driving rod 8 passing through the stirring shaft 4 and sleeved with the stirring shaft 4, a positioning block 9 fixedly connected to the bottom of the driving rod 8, and the L-shaped plate 5 and the sliding plate... An automatic push rod 10 is installed between the 6, which is used to push the sliding plate 6 to move linearly up and down. The top and bottom of the reactor 1 are respectively provided with a first feed chute 11 and a first discharge chute 12. The top and bottom of the collection tank 3 are respectively provided with a second feed chute 13 and a second discharge chute 14. A rotary opening and closing assembly 15 is provided on the right side of the reactor 1. The rotary opening and closing assembly 15 is used to control the opening and closing of the first discharge chute 12. A connecting assembly 16 is installed on the top of the collection tank 3. A filter assembly 17 is installed on the connecting assembly 16. The filter assembly 17 is used to separate the solid and liquid of the material discharged from the first discharge chute 12.

[0056] In this embodiment, the driving component 7 includes, but is not limited to, devices that provide driving force such as motors and hydraulic motors, and only needs to provide rotational force to the driving rod 8.

[0057] In this embodiment, the automatic push rod 10 includes, but is not limited to, devices that provide linear displacement power such as electric telescopic rods, cylinders, hydraulic rods, and linear slides, which only need to drive the sliding plate 6 to move up and down.

[0058] It is understandable that the outer surface of the stirring shaft 4 is provided with multiple stirring blades, and the shape and distribution of the stirring blades can be selected or adjusted according to actual usage requirements.

[0059] Please refer to the following: Figure 6 A locking structure is also provided between the stirring shaft 4 and the drive rod 8, including at least one locking block and a locking groove. The locking block is installed on the outer surface of the drive rod 8, and the locking groove is opened on the inner surface of the stirring shaft 4. The locking block slides inside the locking groove. This locking structure can ensure the limiting between the drive rod 8 and the stirring shaft, so that the rotational force of the drive rod 8 can be transmitted to the stirring shaft 4, and the drive rod 8 still has a vertical movement trajectory.

[0060] In one embodiment, the cross-sections of the stirring shaft 4 and the drive rod 8 are irregular shapes other than circular, and the drive rod 8 passes through the interior of the stirring shaft 4, which can limit the movement of both.

[0061] In this embodiment, the application has three usage states, specifically:

[0062] For reference, please refer to the Qing Dynasty. Figure 8 Initial state (i.e., stirring reaction state): The solution slurry and reaction liquid are introduced into the reactor 1 from the first feed tank 11 for reaction. The drive rod 8 is driven to rotate by the drive component 7, thereby causing the stirring shaft 4 to rotate to stir the reaction and produce solid precipitate.

[0063] Please refer to the following: Figure 9 In the solid-liquid separation state: the extension of the automatic push rod 10 drives the sliding plate 6 to move downward, thereby causing the drive rod 8 to extend downward and drive the connecting rod 156 to move downward, thereby causing the slider 157 to slide inside the slide groove 153, thereby causing the rotating drum 152 to rotate, which in turn drives the sealing plate 154 to rotate, so that the through hole 155 is aligned with the first discharge groove 12, thereby discharging the material into the filter assembly 17 for solid-liquid separation;

[0064] Please refer to the following: Figure 10 Solid discharge state: As the automatic push rod 10 continues to extend, the drive rod 8 continues to extend downward, which will cause the positioning block 9 to dock with the connecting component 16. With the rotation drive of the drive component 7, the filter component 17 will rotate and then flip to discharge the solid sediment.

[0065] Please refer to the following: Figure 4 The rotating opening and closing assembly 15 includes a support block 151, a rotating cylinder 152, a sliding groove 153, a sealing plate 154, a through hole 155, a connecting rod 156, and a slider 157. The support block 151 is fixedly connected to one side of the reactor 1. The top of the rotating cylinder 152 is rotatably connected to the bottom of the support block 151. The sliding groove 153 is opened on the outer surface of the rotating cylinder 152. The sealing plate 154 is fixedly connected to the bottom of the rotating cylinder 152 and is in close contact with the bottom of the first discharge trough 12. The through hole 155 is opened on the sealing plate 154. The top of the connecting rod 156 is fixedly connected to the bottom of the sliding plate 6. One side of the slider 157 is fixedly connected to the connecting rod 156, and the other side of the slider 157 slides inside the sliding groove 153.

[0066] In this embodiment, when the slider 157 slides along the spiral section of the groove 153 to the bottom, the rotation angle of the rotating drum 152 is such that the through hole 155 is at the bottom of the first discharge groove 12.

[0067] In use, the automatic push rod 10 drives the sliding plate 6 to move downward, which in turn causes the connecting rod 156 to move downward, thereby causing the slider 157 to move downward and slide in the spiral section of the chute 153, thereby driving the rotating drum 152 to rotate, which in turn causes the sealing plate 154 to rotate, and the through hole 155 to move circumferentially to the bottom of the first discharge chute 12, realizing the discharge of the first discharge chute 12. By controlling the opening and closing of the first discharge chute 12, the device can switch between the stirring reaction state and the solid-liquid separation state.

[0068] Please refer to it again. Figure 4 The slide 153 includes a first slide 1531 and a second slide 1532, which are connected. The first slide 1531 is spiral and the second slide 1532 is vertical.

[0069] In this embodiment, the first slide groove 1531 is provided to cooperate with the use of the slider 157 to achieve the purpose of controlling the rotation of the rotating drum 152. The second slide groove 1532 is provided so that after the automatic push rod 10 extends further, the slider 157 has a downward movement space to avoid motion interference and jamming.

[0070] Please refer to the following: Figure 5 The connecting assembly 16 includes a fixed shaft 161, a first rotating shaft 162, a first transmission gear 163, a connecting block 164, a positioning groove 165, a second rotating shaft 166, and a second transmission gear 167. The bottom of the fixed shaft 161 is fixedly connected to the top of the collection pool 3. The first rotating shaft 162 is rotatably connected to the top of the fixed shaft 161. The first transmission gear 163 is fixedly connected to the outer surface of the fixed shaft 161. The connecting block 164 is fixedly connected to the top of the first rotating shaft 162. The positioning groove 165 is formed on the connecting block 164. The second rotating shaft 166 is rotatably connected to one side of the first rotating shaft 162. The second transmission gear 167 is fixedly connected to the outer surface of the second rotating shaft 166.

[0071] In this embodiment, the first transmission gear 163 and the second transmission gear 167 include, but are not limited to, mechanical transmission structures such as bevel gears or planetary gear sets.

[0072] In this embodiment, the first transmission gear 163 is a residual gear, with only half of its teeth covering the surface. When the second transmission gear 167 rotates in a circular motion, it comes into contact with the teeth of the first transmission gear 163, and the two can be in a meshing state.

[0073] In use, when the positioning block 9 is inserted into the positioning groove 165, the first rotating shaft 162 rotates, thereby driving the second rotating shaft 166 to move in a circular motion. The second transmission gear 167 moves in a circular motion with the second rotating shaft 166. Since the initial contact is a smooth surface, the second rotating shaft 166 will not rotate, ensuring the smooth removal of the filter assembly 17. With continuous circular motion, when the second transmission gear 167 meshes with the first transmission gear 163 and rolls on it, the second rotating shaft 166 rotates one revolution, thereby causing the filter assembly 17 to rotate one revolution, thus discharging the material inside the filter assembly 17, facilitating material discharge and achieving the purpose of cleaning the filter assembly 17 at the same time.

[0074] In one embodiment, the transmission ratio of the first transmission gear 163 and the second transmission gear 167 can be selected according to actual needs, so that after the second transmission gear 167 rolls on the tooth surface of the first transmission gear 163, it can rotate one revolution or multiple revolutions.

[0075] Please refer to the following: Figure 7 The filter assembly 17 includes an outer cylinder 171, a filter plate 172, and an installation assembly 173. The outer cylinder 171 is fixedly connected to the second rotating shaft 166. The filter plate 172 is installed inside the outer cylinder 171 through the installation assembly 173. The installation assembly 173 includes a support block 1731, a limiting member 1732, and a limiting hole 1733. The support block 1731 is fixedly connected to the side wall of the outer cylinder 171. The limiting hole 1733 is opened on the filter plate 172. The limiting member 1732 is installed on the outer cylinder 171.

[0076] In this embodiment, the limiting member 1732 is a bolt and the limiting hole 1733 is a screw hole. By screwing the limiting member 1732 into the limiting hole 1733, the filter plate 172 can be conveniently fixed, making it easy to disassemble and replace.

[0077] In one embodiment, the limiting member 1732 can be a spring pin, and the limiting hole 1733 can be a pin hole. The filter plate 172 can be conveniently fixed by inserting the limiting member 1732 into the limiting hole 1733.

[0078] Please refer to the following: Figure 3 A solid material frame 18 is installed on the top of the collection tank 3, and a control panel 19 is installed on one side of the reactor 1.

[0079] In this embodiment, the solid material frame 18 is used to collect the solid material discharged from the filter assembly 17;

[0080] In one embodiment, the solid material frame 18 may also be provided with an auxiliary material distribution structure to classify and collect the material discharged from the filter assembly 17 each time.

[0081] The working principle of the apparatus for preparing micronized battery-grade lithium hydroxide monohydrate provided by this invention is as follows:

[0082] The solution slurry and reaction liquid are introduced into the reactor 1 from the first feed trough 11 for reaction. The drive rod 8 is rotated by the drive component 7, which in turn rotates the stirring shaft 4 to stir the reaction. After solid precipitate is generated, the extension of the automatic push rod 10 causes the sliding plate 6 to move downward, which in turn causes the drive rod 8 to extend downward and drives the connecting rod 156 to move downward, so that the slider 157 slides inside the trough 153, causing the rotating drum 152 to rotate, which in turn causes the sealing plate 154 to rotate, so that the through hole 155 is aligned with the first discharge trough 12, thereby discharging the material into the filter assembly 17 for solid-liquid separation. The liquid enters the collection tank through the second feed trough 13, and the solid precipitate remains inside the filter assembly 17. The continued extension of the automatic push rod 10 causes the drive rod 8 to continue to extend downward, at which point the positioning block 9 docks with the connecting assembly 16. With the rotation drive of the drive component 7, the filter assembly 17 rotates in a circular motion and then flips to discharge the solid precipitate.

[0083] Compared with related technologies, the apparatus for preparing micronized battery-grade lithium hydroxide monohydrate provided by the present invention has the following beneficial effects:

[0084] The reaction rate is increased by stirring the reaction through the rotation of the stirring shaft 4. Then, the initial extension of the automatic push rod 10 opens the rotating opening and closing component 15, allowing the material to be discharged into the filter component 17 for solid-liquid separation. This realizes the transition from the reaction state to the solid-liquid separation state. The further extension of the automatic push rod 10 causes the drive rod 8 to extend downward, driving the positioning block 9 to dock with the connecting component 16. With the rotation drive of the drive component 7, the filter component 17 moves in a circular motion and then flips to discharge the solid sediment. This realizes the transition from the solid-liquid separation state to the discharge state, which facilitates the discharge of solid sediment and prevents the accumulation on the filter component 17 from affecting the filtration effect and avoiding water blockage.

[0085] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An apparatus for preparing micronized battery-grade lithium hydroxide monohydrate, characterized in that, Including reaction vessels; The reactor has a support frame at its bottom, a collection tank at its bottom, a stirring shaft inside the reactor (the shaft is hollow), an L-shaped plate fixedly connected to its top, a sliding plate slidably connected to the L-shaped plate, a driving component mounted on the sliding plate, a driving rod mounted on the output shaft of the driving component, the driving rod passing through and sleeved with the stirring shaft, a positioning block fixedly connected to the bottom of the driving rod, an automatic push rod between the L-shaped plate and the sliding plate (for pushing the sliding plate to move linearly up and down), a first feed chute and a first discharge chute at the top and bottom of the reactor, and a second feed chute and a second discharge chute at the top and bottom of the collection tank, respectively. A rotating opening and closing assembly is located on the right side of the reactor, controlling the opening and closing of the first discharge chute. A connecting assembly is mounted on the top of the collection tank, and a filter assembly is mounted on the connecting assembly for solid-liquid separation of the material discharged from the first discharge chute. The rotating opening and closing assembly includes a support block, a rotating cylinder, a sliding groove, a sealing plate, a through hole, a connecting rod, and a slider. The support block is fixedly connected to one side of the reactor. The top of the rotating cylinder is rotatably connected to the bottom of the support block. The sliding groove is opened on the outer surface of the rotating cylinder. The sealing plate is fixedly connected to the bottom of the rotating cylinder and is in close contact with the bottom of the first discharge chute. The through hole is opened on the sealing plate. The top of the connecting rod is fixedly connected to the bottom of the sliding plate. One side of the slider is fixedly connected to the connecting rod, and the other side of the slider slides inside the sliding groove. The slide includes a first slide and a second slide, which are connected to each other. The first slide is spiral-shaped and the second slide is vertical. The connecting assembly includes a fixed shaft, a first rotating shaft, a first transmission gear, a connecting block, a positioning groove, a second rotating shaft, and a second transmission gear. The bottom of the fixed shaft is fixedly connected to the top of the collection pool. The first rotating shaft is rotatably connected to the top of the fixed shaft. The first transmission gear is fixedly connected to the outer surface of the fixed shaft. The connecting block is fixedly connected to the top of the first rotating shaft. The positioning groove is formed on the connecting block. The second rotating shaft is rotatably connected to one side of the first rotating shaft. The second transmission gear is fixedly connected to the outer surface of the second rotating shaft. The filter assembly includes an outer cylinder, a filter plate, and an installation assembly. The outer cylinder is fixedly connected to a second rotating shaft. The filter plate is installed inside the outer cylinder via the installation assembly. The installation assembly includes a support block, a limiting member, and a limiting hole. The support block is fixedly connected to the side wall of the outer cylinder. The limiting hole is opened on the filter plate. The limiting member is installed on the outer cylinder. The solution slurry and reaction liquid are introduced into the reactor from the first feed trough for reaction. The drive rod rotates, which in turn rotates the stirring shaft to stir the reaction. After solid precipitate is produced, the extension of the automatic push rod moves the sliding plate downward, which in turn extends the drive rod downward and moves the connecting rod downward. This causes the slider to slide inside the chute, which in turn causes the drum to rotate, thereby causing the sealing plate to rotate. This aligns the through hole with the first discharge trough, allowing the material to be discharged into the filter assembly for solid-liquid separation. The liquid enters the collection tank through the second feed trough, while the solid precipitate remains inside the filter assembly. The continued extension of the automatic push rod causes the drive rod to extend further downward, at which point the positioning block docks with the connecting assembly. Combined with the rotation of the drive rod, this causes the filter assembly to rotate in a circular motion and then flip, discharging the solid precipitate.

2. The apparatus for preparing micronized battery-grade lithium hydroxide monohydrate according to claim 1, characterized in that, A solid material frame is installed on the top of the collection tank, and a control panel is installed on one side of the reaction vessel.

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