Impurity removal device for lithium carbonate production and method of use thereof

Abstract

The application belongs to the technical field of chemical industry, and discloses a device for removing impurities for lithium carbonate preparation and a use method thereof. The device comprises a tank body, a funnel-shaped feeding partition plate is arranged in the tank body, a filtering mechanism is arranged at the bottom of the feeding partition plate and is used for separating a solution from solid impurities, a storage assembly is arranged at the bottom of the filtering mechanism and is used for collecting and storing the separated solid impurities, the filtering mechanism comprises a cylinder arranged at the bottom of the feeding partition plate, and a plurality of filter screens one in the shape of a fan ring are arranged at the outer side of the bottom of the cylinder. The device can stir the mixed solution in the cylinder by rotating the impeller, make the mixed solution rotate in the cylinder, flush the solid impurities adhered to the filter screen one, flush away the solid impurities blocked on the filter screen one, prevent the solid impurities from blocking the filter screen one, and make the mixed solution flush the filter screen one tangentially, so that the solid impurities are prevented from being squeezed into the filter screen one and from damaging the filter screen one.

Description

Technical Field

[0001] The present invention relates to the field of chemical technology, and more particularly to an impurity removal device for lithium carbonate preparation and a method for using the same. Background Art

[0002] Lithium carbonate is an inorganic compound with the chemical formula Li2CO3 and a molecular weight of 73.89. It is a colorless monoclinic crystal, slightly soluble in water and dilute acid, but insoluble in ethanol and acetone. Its thermal stability is lower than that of carbonates of other elements in the periodic table. It does not deliquesce in air and can be obtained by adding sodium carbonate to a lithium sulfate or lithium oxide solution. Its aqueous solution can be converted into an acid salt by bubbling carbon dioxide through it, which hydrolyzes upon boiling. It is used as a raw material for ceramics, glass, ferrites, and as a silver paste for component spraying. It is also used medically to treat depression.

[0003] At present, in the process of preparing lithium carbonate by sulfuric acid method, it is necessary to add soda ash and quicklime to the lithium sulfate solution to make it alkaline, so that the metal ions in the lithium sulfate generate insoluble solid impurities, and then filter out the impurities. During the filtration process, solid particles will adhere to the surface of the filter, blocking the filter channel and affecting the filter efficiency. When the filter is cleaned, the solid particles will be squeezed into the filter, blocking or causing the mesh to become larger, resulting in a slower filtration speed or incomplete removal of solid particles due to the enlarged mesh.

[0004] In view of this, the present application proposes an impurity removal device for lithium carbonate preparation and a method for using the same. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention proposes an impurity removal device for lithium carbonate preparation and a method for using the same.

[0006] To achieve the above object, the present invention provides the following technical solution: an impurity removal device for lithium carbonate preparation, comprising a tank body, a funnel-shaped feed partition provided inside the tank body, a filter mechanism provided at the bottom of the feed partition for separating solution from solid impurities, and a storage assembly provided at the bottom of the filter mechanism for collecting and storing the separated solid impurities;

[0007] The filtering mechanism includes a cylinder arranged at the bottom of the feed partition, a plurality of fan-shaped filter screens are arranged on the outer side of the bottom of the cylinder, a rotating impeller is arranged inside the cylinder, the rotating impeller rotates inside the cylinder, stirring the solution to rotate and flush the filter screen, and a speed regulating component is arranged on the top of the rotating impeller for controlling the filtration rate.

[0008] Furthermore, a feed pipe is installed on one side of the tank body, and a discharge pipe is provided at the bottom of the tank body.

[0009] Furthermore, the filtering mechanism further includes a driving motor disposed on the top of the tank body, and a driving shaft connecting the output shaft of the driving motor and the rotating impeller, wherein one end of the driving shaft away from the driving motor is connected to a support frame, and the support frame is installed inside the tank body;

[0010] A slag discharge channel is provided at the bottom of the cylinder, and a second filter screen is provided at the bottom of the slag discharge channel.

[0011] Furthermore, the slag discharge channel is arranged at an angle, the top end of the slag discharge channel is communicated with the cylinder, and the bottom end of the slag discharge channel extends into the interior of the storage assembly.

[0012] Furthermore, the rotating impeller includes a connecting seat mounted on the outside of the drive shaft, a plurality of blades are arranged in a ring shape on the outside of the connecting seat, a rotating shaft is arranged between the blades and the connecting seat, one end of the rotating shaft is connected to the center of the blade, and the other end of the rotating shaft passes through the connecting seat and is rotatably connected to the connecting seat.

[0013] Furthermore, the speed regulating assembly includes a plurality of short shafts corresponding to the blades one by one, the short shafts are arranged below the rotating shaft, one end of the short shafts is connected to the blades, a movable block is provided on the top of the connecting seat, the movable block is sleeved on the outside of the driving shaft, and a connecting rod is connected between the movable block and the short shaft;

[0014] A fixed block, a limiting block and a floating ring are sequentially arranged at the bottom of the movable block. The fixed block is installed on the driving shaft. A plug rod is connected between the movable block and the limiting block. The plug rod passes through the fixed block and is slidably connected to the fixed block.

[0015] Furthermore, the storage assembly includes a movable box, a slide rail and a cover plate. The movable box is arranged inside the tank body, one end of the movable box passes through the tank body and is slidably connected to the tank body, the slide rail is arranged at the bottom of the movable box, the movable box slides on the top of the slide rail, the two ends of the slide rail are connected to the inner wall of the tank body, the cover plate is arranged on the top of the movable box, and the two ends of the cover plate are connected to the inner wall of the tank body.

[0016] Furthermore, the cross-sectional shape of the cover plate is set to be an inverted V shape, and the bottom end of the slag discharge channel passes through the cover plate.

[0017] Furthermore, two baffles are arranged in parallel inside the movable box to divide the movable box into three side-by-side cavities. Overflow grooves are provided on the tops of the two baffles, and a drainage groove is provided on one side of the movable box.

[0018] The method for using the impurity removal device for preparing lithium carbonate comprises the following steps:

[0019] S1. Adding soda ash and lime milk to the lithium sulfate solution in advance for reaction, and introducing the mixed solution after the reaction into the tank through the feed pipe on one side of the tank;

[0020] S2. When the mixed solution enters the tank, the drive motor is started to drive the rotary impeller to rotate and stir the mixed solution entering the cylinder. The lithium sulfate solution passes through the filter screen 1 or the filter screen 2 and is finally discharged through the discharge pipe at the bottom of the tank, while the solid impurities fall into the movable box through the slag discharge channel;

[0021] S3. Part of the lithium sulfate solution enters the cavity inside the movable box along with the solid impurities, and is discharged into the tank from the drainage trough on one side of the movable box through the sedimentation of the three cavities, and finally discharged from the discharge pipe at the bottom of the tank;

[0022] S4. When a lot of solid impurities accumulate inside the movable box, the movable box can be pulled out and the cavity inside it can be cleaned.

[0023] The technical effects and advantages of the impurity removal device for lithium carbonate preparation and the use method thereof of the present invention are as follows:

[0024] (1) The mixed solution entering the cylinder is stirred by the rotating impeller, so that the mixed solution rotates inside the cylinder, flushing the solid impurities attached to the filter screen 1, and flushing away the solid impurities blocking the filter screen 1 to prevent them from blocking the filtration of the filter screen 1. In addition, the rotating mixed solution flushes the solid impurities on the surface of the filter screen. The mixed solution tangentially flushes the filter screen 1, which can prevent the mixed solution from squeezing the solid impurities into the interior of the filter screen 1, preventing them from damaging the filter screen 1, and making the solid impurities on the surface of the filter screen 1 more thoroughly removed.

[0025] (2) By setting a plurality of deflectable blades to form a rotating impeller, the vertical blade deflection inclination can be adjusted, and while stirring the mixed solution, downward pressure is applied to the mixed solution to accelerate it through the filter screen, thereby improving the impurity removal speed.

[0026] (3) Through the speed regulating assembly set at the bottom of the rotating impeller, when the mixed solution on the top of the feeding partition accumulates too much, the float ring floats up with the mixed solution, and the movable block is driven by the limit block and the plug rod to raise the position of the movable block, and then the short shaft located below the rotating shaft is pulled by the connecting rod to drive the blade to flip, and the filtration can be automatically controlled and accelerated according to the feed speed.

[0027] (4) By providing a storage component connected to the filtering mechanism, the solid impurities separated by the filtering mechanism can be sent to the storage component for storage, so as to facilitate the cleaning and transfer of the solid impurities.

[0028] (5) By setting up two baffle separation movable boxes, solid impurities and a small amount of solution will enter the outermost cavity through the slag discharge channel. After three precipitations in three cavities, solid impurities can be avoided from mixing into the discharged solution, and the small amount of solution mixed in the solid impurities can be re-separated to reduce the loss of lithium sulfate solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0030] Figure 2 It is a partial cross-sectional view of the present invention.

[0031] Figure 3 It is a schematic diagram of the overall structure of the filtering mechanism in the present invention.

[0032] Figure 4 It is a schematic diagram of the matching structure of the cylinder and the slag discharge channel in the present invention.

[0033] Figure 5 Schematic diagram of the overall structure of the rotating impeller in the present invention.

[0034] Figure 6 It is a schematic diagram of the coordination structure of the rotating impeller and the speed regulating assembly in the present invention.

[0035] Figure 7 It is a partial exploded view of the rotating impeller and speed regulating assembly in the present invention.

[0036] Figure 8 This is a schematic diagram of the vertical state of the blade in the present invention.

[0037] Figure 9 It is a schematic diagram of the blade deflection state in the present invention.

[0038] Figure 10 It is a schematic diagram of the coordinated structure of the filtering mechanism and the storage component in the present invention.

[0039] Figure 11 Schematic diagram of the overall structure of the storage component in the present invention.

[0040] In the picture:

[0041] 1. Tank body; 2. Feeding partition; 3. Filter mechanism; 4. Storage component;

[0042] 31. Cylinder; 32. Filter screen 1; 33. Rotating impeller; 34. Speed ​​regulating assembly; 35. Drive motor; 36. Drive shaft; 37. Slag discharge channel; 38. Filter screen 2; 39. Support frame;

[0043] 331, connecting seat; 332, blade; 333, rotating shaft;

[0044] 341. Short shaft; 342. Connecting rod; 343. Fixed block; 344. Movable block; 345. Insert rod; 346. Limit block; 347. Floating ring;

[0045] 41. Movable box; 42. Slide rail; 43. Cover plate; 44. Baffle; 45. Overflow trough; 46. Drain trough. DETAILED DESCRIPTION

[0046] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] Example 1

[0048] The present invention provides Figure 1-4 The impurity removal device for lithium carbonate preparation shown includes a tank body 1, a funnel-shaped feeding partition 2 is provided inside the tank body 1, a filtering mechanism 3 is provided at the bottom of the feeding partition 2 for separating the solution from solid impurities, and a storage component 4 is provided at the bottom of the filtering mechanism 3 for collecting and storing the separated solid impurities.

[0049] A feed pipe is installed on one side of the tank body 1, and a discharge pipe is provided at the bottom of the tank body 1.

[0050] It should be noted that this device is used to separate lithium sulfate from magnesium, calcium and other plasma precipitates. The feed pipe arranged on one side of the tank body 1 is located above the feed partition 2. The mixed solution after the reaction is completed is fed into the filter mechanism 3 through the funnel-shaped feed partition 2. The solid impurities and the lithium sulfate solution are separated by the filter mechanism 3, and the storage component 4 arranged at the bottom of the filter mechanism 3 can collect and aggregate the separated solid impurities, and the lithium sulfate solution is discharged from the discharge pipe at the bottom of the tank body 1.

[0051] The filtering mechanism 3 includes a cylinder 31 arranged at the bottom of the feed partition 2. The top of the cylinder 31 is fixedly connected to the feed partition 2. A plurality of fan-shaped filter screens 32 are arranged on the outer side of the bottom of the cylinder 31. The mixed solution entering the cylinder 31 is separated by the filter screen 32. The lithium sulfate solution passes through the filter screen 32, while the solid impurities are blocked by the filter screen 32. A rotating impeller 33 is arranged inside the cylinder 31. The rotating impeller 33 rotates inside the cylinder 31, stirring the solution to rotate and flush the filter screen 32. A speed regulating component 34 is arranged on the top of the rotating impeller 33 to control the deflection of the rotating impeller 33 and apply a downward thrust to the mixed solution, thereby controlling the filtration rate.

[0052] Reference Figure 1The cylinder 31 is fixed at the bottom of the feeding partition 2, and the cylinder 31 closes the opening at the bottom of the feeding partition 2. The mixed solution enters the cylinder 31 through the opening at the bottom of the feeding partition 2 and is separated from the solid impurities and the solution by the filter 32. At the same time, Figure 3 As shown, the rotating impeller 33 stirs the mixed solution entering the cylinder 31, causing the mixed solution to rotate inside the cylinder 31, flushing the solid impurities attached to the filter screen 32, and flushing away the solid impurities blocking the filter screen 32 to prevent them from blocking the filter screen 32. At the same time, the fan-shaped filter screen 32 is distributed at the outer edge of the bottom of the tank body 1. The flow rate of the solution at this position is greater than the flow rate near the center of the cylinder 31, which can enable the solution to flush the solid impurities at a greater speed, making it easier for the solid impurities to separate from the filter screen 32. In addition, using the solution and flushing the filter screen 32 tangentially will not press the solid impurities into the filter screen 32, thereby not causing damage to the filter screen 32. Moreover, by providing the rotating impeller 33, the state of the rotating impeller 33 can be adjusted, and it can be deflected, thereby exerting downward force on the mixed solution and accelerating the speed of the solution passing through the filter screen 32.

[0053] The filtering mechanism 3 also includes a driving motor 35 arranged on the top of the tank body 1, and a driving shaft 36 connecting the output shaft of the driving motor 35 and the rotating impeller 33. The output shaft of the driving motor 35 drives the rotating impeller 33 to rotate through the driving shaft 36. The end of the driving shaft 36 away from the driving motor 35 is connected to a support frame 39. The support frame 39 is installed inside the tank body 1 to support the end of the driving shaft 36, thereby improving the stability of the rotation of the rotating impeller 33 and preventing it from shaking.

[0054] Among them, the output shaft of the driving motor 35 is installed downward on the top of the tank body 1, and the driving shaft 36 connected to its output shaft passes through the tank body 1 and extends into the interior of the tank body 1. The driving shaft 36 passes through the rotating impeller 33 and the cylinder body 31 inside the cylinder body 31 in turn. The rotating impeller 33 is installed on the driving shaft 36 so that it can be driven by the driving motor 35. The bottom end of the driving shaft 36 is supported by the support frame 39 installed inside the tank body 1, and the driving shaft 36 is limited to the center position of the tank body 1.

[0055] A slag discharge channel 37 is provided at the bottom of the cylinder 31. Figure 3 、 4 As shown, the slag discharge channel 37 corresponds to multiple filter screens 32 and is distributed in a ring shape at the bottom of the cylinder 31, so that the solid impurities washed off the filter screen 32 by the solution can fall into the slag discharge channel 37. The slag discharge channel 37 is provided with a filter screen 2 38 near the bottom, and part of the solution that follows the solid impurities into the slag discharge channel 37 can be separated out by the filter screen 2 38.

[0056] Reference Figure 3 、 4As the rotating impeller 33 rotates, the mixed solution forms a rotating water flow inside the cylinder 31. Most of the solution flows out from the filter screen 32 at the bottom of the cylinder 31, and a small part of the solution mixed with the washed solid impurities enters the slag discharge channel 37. The solution is discharged through the filter screen 38 at the bottom of the slag discharge channel 37. As the device continues to operate, the solid impurities are continuously washed and then merged into the slag discharge channel 37, so that the filter screen 32 is always kept in an unobstructed state.

[0057] The slag discharge channel 37 is set at an angle, the top of the slag discharge channel 37 is connected to the cylinder 31, and the lower end of the slag discharge channel 37 extends into the storage component 4. The slag discharge channel 37 connects the cylinder 31 and the storage component 4 to transport solid impurities into the slag discharge channel 37.

[0058] like Figure 2 、 3 As shown, the inclination direction of the slag discharge channel 37 is the same as the rotation direction of the rotating impeller 33, so that solid impurities can enter the interior of the slag discharge channel 37 more smoothly and be discharged from the interior of the storage component 4 through the slag discharge channel 37.

[0059] The specific implementation method is as follows: first, the reacted mixed liquid is introduced into the interior of the tank body 1 from the feed pipe on one side of the tank body 1, the mixed liquid enters the interior of the filter mechanism 3 through the feed partition 2, and the mixed solution is filtered through the filter screen 32 located inside the cylinder 31. At the same time, the drive motor 35 is started, and the rotating impeller 33 is driven by the drive shaft 36 to stir the mixed liquid inside the cylinder 31 to accelerate the tangential flushing of the filter screen 32, flushing out the solid precipitate impurities attached to the filter screen 32, and preventing the solid impurities in the mixed liquid from clogging the filter screen 32. In addition, the solid impurities are sent to the storage component 4 in conjunction with the slag discharge channel 37 installed at the bottom of the cylinder 31.

[0060] Example 2

[0061] Based on the rotating impeller 33 and the speed regulating assembly 34 in the tank proposed in the first embodiment, the present invention provides the following Figure 2-9 Further technical solutions.

[0062] The rotating impeller 33 includes a connecting seat 331 that is sleeved on the outside of the driving shaft 36. The outside of the connecting seat 331 is provided with multiple blades 332 in a ring shape. A rotating shaft 333 is provided between the blades 332 and the connecting seat 331. One end of the rotating shaft 333 is connected to the center of the blade 332, and the other end of the rotating shaft 333 passes through the connecting seat 331 and is rotatably connected to the connecting seat 331.

[0063] Reference Figure 7The connecting seat 331 is fixedly mounted on the outside of the driving shaft 36, so that the driving motor 35 can drive the rotary impeller 33 to rotate through the driving shaft 36, and the blade 332 is rotatably connected to the connecting seat 331 through the rotating shaft 333 to realize the flipping of the blade 332. The rotating shaft 333 is fixed at the center of the blade 332, so that the forces at both ends of the blade 332 relative to the center of the rotating shaft 333 are balanced. The blade 332 will not deflect when stirring the solution inside the cylinder 31, and when needed, such as Figure 9 As shown, the blade 332 can be flipped so that it can exert a downward force on the solution while stirring the solution and rotating it, so that the solution can pass through the filter screen 32 more quickly, thereby improving the efficiency of the impurity removal device.

[0064] The speed regulating assembly 34 includes a plurality of short shafts 341 corresponding to the blades 332. The short shaft 341 is arranged below the rotating shaft 333. One end of the short shaft 341 is connected to the blade 332. A movable block 344 is provided on the top of the connecting seat 331. The movable block 344 is sleeved on the outside of the driving shaft 36 like the connecting seat 331. The difference is that the movable block 344 can slide up and down along the driving shaft 36. A connecting rod 342 is connected between the movable block 344 and the short shaft 341. The top end of the connecting rod 342 is hinged to the movable block 344, and the other end of the connecting rod 342 is penetrated by the short shaft 341, so that the connecting rod 342 can rotate around the short shaft 341. Initially, the hinge point of the connecting rod 342 and the movable block 344 is located obliquely above the short shaft 341. As the movable block 344 moves upward, the short shaft 341 can drive the blade 332 to rotate in the direction of the tilt of the connecting rod 342.

[0065] The bottom of the movable block 344 is provided with a fixed block 343, a limit block 346 and a floating ring 347 in sequence. The fixed block 343 is installed on the drive shaft 36 to fix the fixed block 343 to the drive shaft 36. A plug rod 345 is connected between the movable block 344 and the limit block 346. The plug rod 345 passes through the fixed block 343 and is slidably connected to the fixed block 343. The movable block 344, the limit block 346 and the floating ring 347 are limited by the plug rod 345 so that they can rotate synchronously with the drive shaft 36 and keep rotating synchronously with the rotating impeller 33 at the bottom. The two ends of the plug rod 345 are connected to the limit blocks 346 and the movable block 344 and slide with the fixed block 343. The fixed block 343 is located between the limit block 346 and the movable block 344, which can limit the movement of the movable block 344, so that the state of the rotating impeller 33 is as follows. Figure 8 and Figure 9 Switch between.

[0066] When the movable block 344 moves, the short shaft 341 can be driven by the connecting rod 342, so that the short shaft 341 drives the blade 332 to deflect around the rotating shaft 333. Initially, the short shaft 341 is located directly below the rotating shaft 333, so that the blade 332 remains in a vertical state. At this time, only a horizontal force is applied to the solution. When the feeding speed is greater than the discharging speed, the mixed solution is collected on the feeding partition 2, so that the liquid level of the mixed solution gradually rises, the float ring 347 floats up, and the movable block 344 is driven by the limit block 346 and the insertion rod 345 to make the movable block 344 rise. The movable block 344 pulls the short shaft 341 through the connecting rod 342, so that the blade 332 moves from Figure 8 The status of Figure 9 The state is deflected, so that it can exert a downward force on the solution while stirring the solution to rotate, so that the solution can pass through the filter 32 more quickly, thereby improving the efficiency of the impurity removal device and adjusting the impurity removal speed of the device according to different feed rates.

[0067] The specific implementation method is as follows: when the feed speed of the feed pipe on one side of the tank body 1 is greater than the processing speed of the mixed solution by the filtering mechanism 3, the mixed solution will gather above the feed partition 2, causing the liquid level of the mixed solution to gradually rise until it submerges the float 347. At this time, the float 347 transmits the movable block 344 through the limit block 346 and the insertion rod 345, so that the position of the movable block 344 is raised, and then the short shaft 341 located below the rotating shaft 333 is pulled by the connecting rod 342, so that it drives the blade 332 to flip. The flipped blade can not only stir the solution to rotate, but also exert a downward force on the solution, so that the solution can pass through the filter screen 1 32 more quickly. By changing the state of the blade 332, the impurity removal efficiency is adjusted to meet different usage scenarios.

[0068] Example 3

[0069] Based on the storage component 4 proposed in the first embodiment, the present invention provides the following Figure 1 、 2 , 10, and 11.

[0070] The storage assembly 4 includes a movable box 41, a slide rail 42 and a cover plate 43. The movable box 41 is arranged inside the tank body 1. One end of the movable box 41 passes through the tank body 1 and is slidably connected to the tank body 1. The movable box 41 can be easily pulled out to clean and transfer solid impurities inside the movable box 41. The slide rail 42 is arranged at the bottom of the movable box 41, and the movable box 41 slides on the top of the slide rail 42. The two ends of the slide rail 42 are connected to the inner wall of the tank body 1. The cover plate 43 is arranged on the top of the movable box 41, and the two ends of the cover plate 43 are connected to the inner wall of the tank body 1.

[0071] The cross-section of the cover plate 43 is set to an inverted V shape, so that the solution falling on the top of the cover plate 43 can slide down directly without gathering at the bottom of the cover plate 43. The bottom end of the slag discharge channel 37 passes through the cover plate 43.

[0072] Reference Figure 1 、 2 When a large amount of solid impurities accumulate inside the movable box 41, the movable box 41 can be pulled out by using the handle set at the end of the movable box 41. The setting of the slide rail 42 can limit the movable box 41 and facilitate the movement of the movable box 41. The cover plate 43 located on the top of the movable box 41 can cover the movable box 41 to prevent the solution above from falling into the inside of the movable box 41.

[0073] Two baffles 44 are arranged in parallel inside the movable box 41, dividing the movable box 41 into three side-by-side cavities. The height of the baffle 44 is less than the height of the movable box 41. The outermost cavity corresponds to the slag discharge channel 37. Overflow grooves 45 are provided on the tops of the two baffles 44. The two overflow grooves 45 are respectively located on both sides of the movable box 41. A drainage groove 46 is provided on one side of the movable box 41, and the drainage groove 46 is connected to the innermost cavity.

[0074] Reference Figure 10 、 11 , solid impurities and a small amount of solution will enter the outermost cavity through the slag discharge channel 37. As the two gather, the solid impurities sink to the bottom, while the solution is located above. When the solution fills the first cavity, it will enter the adjacent cavity from the overflow groove 45 opened on the baffle 44. As the second cavity is full, it will enter the third cavity from the overflow groove 45 opened on another baffle 44, and finally be discharged from the drainage groove 46. After three sedimentation steps, solid impurities can be avoided from mixing into the discharged solution. The distance between the overflow grooves 45 on both sides is the farthest, which can further increase the sedimentation distance and avoid solid impurities from mixing into the discharged solution.

[0075] It should be noted that the solid impurities are basically distributed in the outermost cavity. Since the solid impurities are basically precipitated in the outermost cavity, only a small amount of solid impurities remain in the two inner cavities. If necessary, when the impurity removal device is working, part of the movable box 41 can be pulled out to expose the outermost cavity for cleaning, which will not affect the normal operation of the device.

[0076] The specific implementation method is as follows: solid impurities and a small amount of solution will enter the outermost cavity through the slag discharge channel 37, the solids will settle to the bottom of the cavity, and the solution will pass through two overflow troughs 45 in turn to filter out the solid impurities, and finally be discharged through the drainage trough 46 opened on the side wall of the innermost cavity to separate the solution and solid impurities. After a period of use, the solid impurities accumulate inside the movable box 41. The solid impurities inside the movable box 41 can be cleaned and transferred by pulling out the movable box 41 that is movably connected to the tank body 1.

[0077] The method for using the impurity removal device for preparing lithium carbonate comprises the following steps:

[0078] S1, adding soda ash and lime milk to the lithium sulfate solution in advance for reaction, introducing the mixed solution after the reaction into the tank body 1 from the feed pipe on one side of the tank body 1, and sending the mixed solution into the filter mechanism 3 through the feed partition 2 to separate the solid impurities;

[0079] S2. As the mixed solution enters the tank body 1, the drive motor 35 is started to drive the rotary impeller 33 to rotate, stirring the mixed solution entering the cylinder body 31. The lithium sulfate solution is discharged through the filter screen 1 32 or the filter screen 2 38. The solid impurities are blocked by the filter screen 1 32 and the filter screen 2 38. As the rotary impeller 33 rotates, the lithium sulfate solution flushes the solid impurities on the filter screen 1 32. The solid impurities are flushed into the slag discharge channel 37 and then fall into the movable box 41. The lithium sulfate solution is discharged through the discharge pipe at the bottom of the tank body 1.

[0080] S3, part of the lithium sulfate solution enters the cavity inside the movable box 41 along with the solid impurities, and the lithium sulfate solution overflows into the adjacent cavity through the overflow groove 45 on the top of the baffle 44, and after sedimentation in the three cavities, it is finally discharged into the interior of the tank body 1 from the drainage groove 46 on one side of the movable box 41, and then discharged from the discharge pipe at the bottom of the tank body 1;

[0081] S4. When there are a lot of solid impurities accumulated inside the movable box 41, the movable box 41 can be pulled out and the cavity inside it can be cleaned. When necessary, when the impurity removal device is working, part of the movable box 41 can be pulled out to expose the outermost cavity for cleaning, which will not affect the normal operation of the device.

[0082] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0083] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An impurity removal device for preparing lithium carbonate, comprising a tank (1), characterized in that: A funnel-shaped feeding partition (2) is provided inside the tank body (1), a filtering mechanism (3) is provided at the bottom of the feeding partition (2) for separating the solution from the solid impurities, and a storage component (4) is provided at the bottom of the filtering mechanism (3) for collecting and storing the separated solid impurities; The filtering mechanism (3) includes a cylinder (31) arranged at the bottom of the feed partition (2), a plurality of fan-shaped filter screens (32) are arranged on the outer side of the bottom of the cylinder (31), a rotating impeller (33) is arranged inside the cylinder (31), the rotating impeller (33) rotates inside the cylinder (31), agitates the solution to rotate and flush the filter screen (32), and a speed regulating component (34) is arranged on the top of the rotating impeller (33) for controlling the filtering rate; The filtering mechanism (3) further comprises a driving motor (35) arranged at the top of the tank body (1), and a driving shaft (36) connecting the output shaft of the driving motor (35) and the rotating impeller (33); the rotating impeller (33) comprises a connecting seat (331) sleeved on the outside of the driving shaft (36); a plurality of blades (332) are provided on the outside of the connecting seat (331) in an annular shape; a rotating shaft (333) is provided between the blades (332) and the connecting seat (331); one end of the rotating shaft (333) is connected to the center of the blades (332); the other end of the rotating shaft (333) passes through the connecting seat (331) and is rotatably connected to the connecting seat (331); The speed regulating assembly (34) includes a plurality of short shafts (341) corresponding to the blades (332) one by one, the short shafts (341) being arranged below the rotating shaft (333), one end of the short shaft (341) being connected to the blade (332), a movable block (344) being arranged on the top of the connecting seat (331), the movable block (344) being sleeved on the outside of the driving shaft (36), and a connecting rod (342) being connected between the movable block (344) and the short shaft (341); A fixed block (343), a limiting block (346) and a floating ring (347) are sequentially arranged at the bottom of the movable block (344); the fixed block (343) is mounted on the driving shaft (36); an insertion rod (345) is connected between the movable block (344) and the limiting block (346); the insertion rod (345) passes through the fixed block (343) and is slidably connected to the fixed block (343).

2. The impurity removal device for lithium carbonate preparation according to claim 1, wherein A feed pipe is installed on one side of the tank body (1), and a discharge pipe is provided at the bottom of the tank body (1).

3. The impurity removal device for lithium carbonate preparation according to claim 1, wherein One end of the drive shaft (36) away from the drive motor (35) is connected to a support frame (39), and the support frame (39) is installed inside the tank body (1); A slag discharge channel (37) is provided at the bottom of the cylinder (31), and a second filter screen (38) is provided at the bottom of the slag discharge channel (37).

4. The impurity removal device for lithium carbonate preparation according to claim 3, wherein The slag discharge channel (37) is arranged at an angle, the top end of the slag discharge channel (37) is connected to the cylinder (31), and the bottom end of the slag discharge channel (37) extends into the interior of the storage assembly (4).

5. The impurity removal device for lithium carbonate preparation according to claim 3, wherein: The storage assembly (4) comprises a movable box (41), a slide rail (42) and a cover plate (43); the movable box (41) is arranged inside the tank body (1); one end of the movable box (41) passes through the tank body (1) and is slidably connected to the tank body (1); the slide rail (42) is arranged at the bottom of the movable box (41); the movable box (41) slides on the top of the slide rail (42); both ends of the slide rail (42) are connected to the inner wall of the tank body (1); the cover plate (43) is arranged at the top of the movable box (41); and both ends of the cover plate (43) are connected to the inner wall of the tank body (1).

6. The impurity removal device for lithium carbonate preparation according to claim 5, characterized in that: The cross-sectional shape of the cover plate (43) is set to be an inverted V shape, and the bottom end of the slag discharge channel (37) passes through the cover plate (43).

7. The impurity removal device for lithium carbonate preparation according to claim 5, characterized in that: Two baffles (44) are arranged in parallel inside the movable box (41), dividing the movable box (41) into three parallel cavities. Overflow grooves (45) are provided on the tops of the two baffles (44), and a drainage groove (46) is provided on one side of the movable box (41).

8. The method for using the impurity removal device for lithium carbonate preparation according to claim 7, wherein: The steps include: S1. Adding soda ash and lime milk to the lithium sulfate solution in advance for reaction, and introducing the mixed solution after the reaction into the tank body (1) through the feed pipe on one side of the tank body (1); S2. When the mixed solution enters the tank body (1), the driving motor (35) is started to drive the rotating impeller (33) to rotate, thereby stirring the mixed solution entering the cylinder body (31). The lithium sulfate solution passes through the filter screen 1 (32) or the filter screen 2 (38) and is finally discharged through the discharge pipe at the bottom of the tank body (1), while the solid impurities pass through the slag discharge channel (37) and fall into the movable box (41); S3, part of the lithium sulfate solution enters the cavity inside the movable box (41) along with the solid impurities, and is discharged into the tank body (1) from the drainage groove (46) on one side of the movable box (41) through the sedimentation in the three cavities, and finally discharged from the discharge pipe at the bottom of the tank body (1); S4. When a large amount of solid impurities are accumulated inside the movable box (41), the movable box (41) can be pulled out to clean the cavity inside it.

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