Wet leaching tank

Abstract

The utility model discloses a wet leaching tank, and relates to the technical field of lithium battery preparation, the wet leaching tank comprises a tank body and a cover plate, the tank body is provided with a leaching cavity with an opening on one side; the cover plate covers the opening, a stirring structure is arranged on the side, away from the opening, of the cover plate, the stirring structure penetrates through the cover plate, extends into the leaching cavity and is used for stirring slurry in the leaching cavity, and a defoaming structure is further arranged on the side, away from the opening, of the cover plate and comprises a scraper assembly and a defoaming driving part. The scraper assembly penetrates through the cover plate and extends into the leaching cavity, the defoaming driving piece is used for driving the scraper assembly to move in the horizontal direction so as to scrape foam, and a foam discharging opening is formed in the position, corresponding to the scraper assembly, of the tank body. Physical defoaming is achieved through the scraper assembly, operation such as addition of a graphite conductive material and an adhesive or spraying of a defoaming agent is not needed, impurities cannot be introduced, and the defoaming effect can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery preparation, in particular to a wet leaching tank. Background Art

[0002] The leaching tank is a liquid-solid reaction device commonly used in hydrometallurgy. It is widely used in non-ferrous metal smelting and secondary metal smelting processes. When the hydrometallurgical process involves a three-phase reaction of gas, liquid and solid, there is often a risk of bubbling. In particular, the probability of bubbling is greatly increased when hydrogen peroxide or gas is required or generated. Once bubbling occurs, it often causes material loss, reduced production efficiency, equipment damage and other problems. In severe cases, it can also cause personal safety.

[0003] There are several main ways to solve the foaming problem in the conventional leaching process: 1) Pre-slurrying. This method is suitable for foaming situations with poor wettability such as the solid-liquid phase is immiscible and the solid phase is light and floats on the upper layer; 2) Spray defoaming. This method uses water or reaction solvent to spray the foam layer to reduce foam. It is suitable for reaction systems with good water solubility, viscous foam layer and low surface tension; 3) Defoaming agent. Additional defoaming agent is added to eliminate the foam in the leaching system to eliminate the generation of foam from the root. However, this method requires the use of defoaming agent and the introduction of impurities. The defoaming agent is often an organic matter, which increases the difficulty of subsequent impurity removal of the leaching solution.

[0004] The above methods are almost not applicable to the black powder leaching process of lithium batteries. Due to the addition of graphite conductive materials and binders in the lithium battery manufacturing process, the low density and poor wettability of negative electrode graphite, etc., a dense and stable foam layer will be formed in the black powder leaching process. Especially in the process of redox leaching of black powder by adding hydrogen peroxide, sulfur dioxide and other atmospheres, the foam layer has the characteristics of fast formation, thickness, density and good stability. Pre-slurrying can only effectively deal with the foam formed due to poor wettability, and it is difficult to completely solve the problem of tank overflow. In the actual production process, spraying can only eliminate a very small part of the foam, has little effect on the foam layer, and will introduce a large amount of water, reducing the tank processing capacity. The introduction of defoaming agent increases the pressure of impurity removal in the subsequent recycling process.

[0005] In general, there is no suitable defoaming method in the leaching process of lithium battery black powder in the prior art. The defoaming effect of the leaching process using the prior art is poor and impurities are introduced. Utility Model Content

[0006] The main purpose of the utility model is to provide a wet leaching tank, aiming to solve the problem that the defoaming method in the prior art has poor defoaming effect in the leaching process of lithium battery black powder and introduces impurities.

[0007] In order to achieve the above-mentioned purpose, the wet leaching tank proposed in the utility model comprises:

[0008] A tank body, wherein the tank body is formed with a leaching chamber with an opening on one side;

[0009] A cover plate, wherein the cover plate is arranged at the opening, a stirring structure is arranged on the side of the cover plate away from the opening, the stirring structure passes through the cover plate and extends into the leaching chamber and is used to stir the slurry in the leaching chamber, and a defoaming structure is also arranged on the side of the cover plate away from the opening, the defoaming structure includes a scraper assembly and a defoaming driving component, the scraper assembly passes through the cover plate and extends into the leaching chamber, the defoaming driving component is used to drive the scraper assembly to move in a horizontal direction to scrape off foam, and a foam discharge outlet is arranged on the trough body corresponding to the scraper assembly.

[0010] In one embodiment, the defoaming drive member is a rotating drive member, and the scraper assembly includes a crank, a connecting rod and a scraper. The two ends of the scraper are respectively a fixed end and a free end. The fixed end is fixed to the cover plate. One end of the crank is connected to the defoaming drive member and is driven to rotate by the defoaming drive member. The other end of the crank is connected to the free end through the connecting rod. The defoaming drive member drives the crank to rotate and drives the connecting rod to rotate, so as to drive the scraper to swing.

[0011] In one embodiment, the scraper includes a scraper connecting rod and a scraper, the fixed end of the scraper connecting rod is fixed to the cover plate through a rotating shaft, and the free end of the scraper connecting rod is connected to the connecting rod, the rotating shaft passes through the cover plate and extends into the leaching chamber, the scraper is located in the leaching chamber and is fixedly connected to the rotating shaft, so that when the connecting rod drives the scraper connecting rod to swing, the scraper is driven to swing through the rotating shaft, and the foam discharge outlet is arranged corresponding to the scraper setting so that the foam is discharged from the foam discharge outlet driven by the scraper.

[0012] In one embodiment, the scraper includes an axial sub-plate and a radial sub-plate connected to each other, the radial sub-plate extends radially along the leaching chamber and is connected to the rotating shaft, and the axial sub-plate is arranged at one end of the radial sub-plate away from the rotating shaft and is arranged at an angle to the radial sub-plate.

[0013] In one embodiment, a fixing bracket is provided on the cover plate, and the defoaming driving member and the fixing end are both mounted on the fixing bracket.

[0014] In one embodiment, the stirring structure includes a stirring drive, a stirring frame and a stirring shaft, the stirring frame is installed on the cover plate, the stirring shaft passes through the cover plate and extends into the leaching chamber, the stirring drive is installed on the stirring frame and is used to drive the stirring shaft to rotate, and a stirring blade is provided at the bottom end of the stirring shaft.

[0015] In one embodiment, there are multiple stirring blades, and the multiple stirring blades are vertically spaced apart on the stirring shaft.

[0016] In one embodiment, a liquid level sensor is provided on the side groove wall of the leaching tank, and a controller is also provided on the cover plate. The liquid level sensor and the defoaming drive are electrically connected to the controller, and the controller is used to control the defoaming drive to start when the liquid level sensor is triggered.

[0017] In one embodiment, a turbulence plate is provided along the circumference of the side wall of the leaching tank.

[0018] In one embodiment, an observation port is provided on the cover plate, and a transparent plate is provided on the observation port.

[0019] The technical solution of the utility model is to arrange a cover plate on the top of the trough body, the cover plate is used to cover the opening of the trough body, and has a certain blocking effect on the foam. At the same time, a defoaming structure is arranged on the top of the cover plate, and a scraper assembly of the defoaming structure passes through the cover plate and extends into the leaching chamber, and at a certain height of the leaching chamber, the scraper assembly is driven by the defoaming driving member to move in the horizontal direction, and the foam at the corresponding part of the scraper assembly is hung to the foam discharge port and discharged. At the same time, the slurry in the leaching chamber is driven to rotate by the rotating driving member. Therefore, even if the scraper assembly cannot cover the entire cross-section of the leaching chamber, the foam will automatically rotate to the scraper assembly with the rotation of the slurry, thereby realizing physical defoaming, without the need to add graphite conductive materials, adhesives or spray defoaming agents, etc., without introducing impurities, and can also improve the defoaming effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 A schematic cross-sectional structure diagram of an embodiment of a wet leaching tank provided by the utility model;

[0022] Figure 2 A schematic diagram of the top view of an embodiment of a wet leaching tank provided by the utility model;

[0023] Figure 3 A partial structural schematic diagram of an embodiment of a wet leaching tank provided by the utility model;

[0024] Figure 4This is a schematic diagram of the top view of the wet leaching tank according to an embodiment of the utility model with the cover plate removed.

[0025] Description of Figure Numbers:

[0026] 100. Wet leaching tank; 1. tank body; 11. leaching chamber; 12. opening; 13. foam outlet; 14. liquid level sensor; 15. turbulence plate; 2. cover plate; 21. stirring structure; 211. stirring drive member; 212. stirring frame; 213. stirring shaft; 214. stirring blade; 22. defoaming structure; 221. scraper assembly; 222. defoaming drive member; 223. crank; 224. connecting rod; 225. scraper; 226. scraper connecting rod; 227. scraper; 2271. axial sub-plate; 2272. radial sub-plate; 228. rotating shaft; 23. fixing bracket; 24. observation port.

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0031] Please combine Figures 1 to 4 The utility model proposes a wet leaching tank 100, comprising a tank body 1 and a cover plate 2, wherein the tank body 1 is formed with a leaching chamber 11 with an opening 12 on one side; the cover plate 2 is covered at the opening 12, and a stirring structure 21 is arranged on the side of the cover plate 2 away from the opening 12, the stirring structure 21 passes through the cover plate 2 and extends into the leaching chamber 11 and is used to stir the slurry in the leaching chamber 11, and a defoaming structure 22 is also arranged on the side of the cover plate 2 away from the opening 12, the defoaming structure 22 comprises a scraper assembly 221 and a defoaming driving member 222, the scraper assembly 221 passes through the cover plate 2 and extends into the leaching chamber 11, the defoaming driving member 222 is used to drive the scraper assembly 221 to move in a horizontal direction to scrape off foam, and a foam discharge port 13 is arranged on the tank body 1 corresponding to the scraper assembly 221.

[0032] The technical solution of the utility model is to set a cover plate 2 on the top of the trough body 1, and the cover plate 2 is used to cover the opening 12 of the trough body 1, so as to block the foam to a certain extent. At the same time, a defoaming structure 22 is set on the top of the cover plate 2, and the scraper assembly 221 of the defoaming structure 22 passes through the cover plate 2 and extends into the leaching chamber 11, and at a certain height of the leaching chamber 11, the scraper assembly 221 is driven to move in the horizontal direction by the defoaming driving member 222, and the foam at the corresponding part of the scraper assembly 221 is hung to the foam discharge port 13 and discharged. At the same time, the slurry in the leaching chamber 11 is driven to rotate by the rotating driving member. Therefore, even if the scraper assembly 221 cannot cover the entire cross-section of the leaching chamber 11, the foam will automatically rotate to the scraper assembly 221 with the rotation of the slurry, thereby realizing physical defoaming, without the need to add graphite conductive materials, adhesives or spray defoaming agents, etc., without introducing impurities, and can also improve the defoaming effect.

[0033] In one embodiment, the defoaming driving member 222 is a rotating driving member, and the scraper assembly 221 includes a crank 223, a connecting rod 224, and a scraper 225. The two ends of the scraper 225 are respectively a fixed end and a free end, and the fixed end is fixed to the cover plate 2. One end of the crank 223 is connected to the defoaming driving member 222 and driven to rotate by the defoaming driving member 222. The other end of the crank 223 is connected to the free end through the connecting rod 224. The defoaming driving member 222 drives the crank 223 to rotate and drives the connecting rod 224 to rotate, so as to drive the scraper 225 to swing. Through the cooperation of the crank 223 and the connecting rod 224, the uninterrupted swing of the rotating driving member is realized, the structure is simple and stable, and the scraper 225 can be repeatedly moved along a fixed range, thereby ensuring its effect of scraping off foam.

[0034] Furthermore, the scraper 225 includes a scraper connecting rod 226 and a scraper 227. The fixed end of the scraper connecting rod 226 is fixed to the cover plate 2 through a rotating shaft 228, and the free end of the scraper connecting rod 226 is connected to the connecting rod 224. The rotating shaft 228 passes through the cover plate 2 and extends into the leaching chamber 11. The scraper 227 is located in the leaching chamber 11 and is fixedly connected to the rotating shaft 228, so that when the connecting rod 224 drives the scraper connecting rod 226 to swing, the scraper 227 is driven to swing through the rotating shaft 228. The scraper 227 is correspondingly arranged at the foam discharge outlet 13 so that the foam is discharged from the foam discharge outlet 13 driven by the scraper 227. By only extending the rotating shaft 228 into the leaching chamber 11, it is possible to avoid opening too many holes on the cover plate 2 and prevent foam from overflowing the cover plate 2. At the same time, the defoaming drive 222, the crank 223, the connecting rod 224 and other structures can be arranged outside the leaching chamber 11, thereby reducing the space occupied by the leaching chamber 11 and increasing the available space of the leaching chamber 11.

[0035] Specifically, the scraper 227 includes an axial sub-plate 2271 and a radial sub-plate 2272 connected to each other, the radial sub-plate 2272 extends in the radial direction of the leaching chamber 11 and is connected to the rotating shaft 228, and the axial sub-plate 2271 is arranged at one end of the radial sub-plate 2272 away from the rotating shaft 228 and is arranged at an angle to the radial sub-plate 2272. The radial sub-plate 2272 and the axial sub-plate 2271 are preferably arranged vertically, and the angle between the radial sub-plate 2272 and the axial sub-plate 2271 plays a role in gathering and collecting the foam, so that the foam is gathered and collected to the foam discharge port 13, thereby improving the defoaming effect.

[0036] In one embodiment, a fixing bracket 23 is provided on the cover plate 2, and the defoaming driving member 222 and the fixed end are both mounted on the fixing bracket 23. By providing the fixing bracket 23 on the cover plate 2 to mount the defoaming driving member 222 and the fixed end, the stability thereof is improved, and the defoaming driving member 222 and the fixed end can be distinguished from other structures to avoid interference.

[0037] In one embodiment, the stirring structure 21 includes a stirring drive 211, a stirring frame 212 and a stirring shaft 213. The stirring frame 212 is mounted on the cover plate 2, and the stirring shaft 213 passes through the cover plate 2 and extends into the leaching chamber 11. The stirring drive 211 is mounted on the stirring frame 212 and is used to drive the stirring shaft 213 to rotate. A stirring blade is provided at the bottom of the stirring shaft 213. The stirring drive 211 and the stirring shaft 213 are both mounted on the stirring frame 212 to avoid interference with other components. At the same time, a stirring blade 214 is provided at the bottom of the stirring shaft 213 to increase its contact area with the slurry, improve its effect of driving the slurry to rotate, and improve the reaction rate.

[0038] Furthermore, there are multiple stirring blades, and multiple stirring blades 214 are vertically spaced apart on the stirring shaft 213. The stirring efficiency is further improved by the multi-layer spaced blades, and the materials of different components can be evenly mixed to prevent the materials from stratification or precipitation.

[0039] In one embodiment, a liquid level sensor 14 is provided on the side wall of the leaching tank, and a controller is also provided on the cover plate 2. The liquid level sensor 14 and the defoaming driving member 222 are both electrically connected to the controller, and the controller is used to control the defoaming driving member 222 to start when the liquid level sensor 14 is triggered. The liquid level is detected by the liquid level sensor 14, and the defoaming driving member 222 is started to defoam when the foam reaches the height of the liquid level sensor 14, and is shut down at other times, thereby avoiding energy loss and equipment wear caused by the defoaming driving member 222 being constantly started, thereby increasing the service life and reducing power consumption.

[0040] In one embodiment, the side wall of the leaching tank is provided with a turbulent plate 15 along its circumference. The turbulent plate 15 can make the fluid form a more complex flow pattern, promote the uniform mixing of different components, prevent stratification and unevenness, and at the same time, by increasing the turbulence of the fluid, the turbulent plate 15 can accelerate the mixing process, shorten the mixing time, and improve production efficiency.

[0041] In one embodiment, an observation port 24 is provided on the cover plate 2, and a transparent plate is provided at the observation port 24. By providing the observation port 24, the specific conditions in the leaching tank can be observed in real time, and when abnormalities or damages occur, they can be discovered in time, thereby improving safety.

[0042] The above are only exemplary embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A wet leaching tank, characterized in that: include: A tank body, wherein the tank body is formed with a leaching chamber with an opening on one side; A cover plate, wherein the cover plate is arranged at the opening, a stirring structure is arranged on the side of the cover plate away from the opening, the stirring structure passes through the cover plate and extends into the leaching chamber and is used to stir the slurry in the leaching chamber, and a defoaming structure is also arranged on the side of the cover plate away from the opening, the defoaming structure includes a scraper assembly and a defoaming driving component, the scraper assembly passes through the cover plate and extends into the leaching chamber, the defoaming driving component is used to drive the scraper assembly to move in a horizontal direction to scrape off foam, and a foam discharge outlet is arranged on the trough body corresponding to the scraper assembly.

2. The wet leaching tank according to claim 1, characterized in that: The defoaming driving member is a rotating driving member, and the scraper assembly includes a crank, a connecting rod and a scraper. The two ends of the scraper are respectively a fixed end and a free end, and the fixed end is fixed to the cover plate. One end of the crank is connected to the defoaming driving member and driven to rotate by the defoaming driving member, and the other end of the crank is connected to the free end through the connecting rod. The defoaming driving member drives the crank to rotate and drives the connecting rod to rotate, so as to drive the scraper to swing.

3. The wet leaching tank according to claim 2, characterized in that: The scraper includes a scraper connecting rod and a scraper, the fixed end of the scraper connecting rod is fixed to the cover plate through a rotating shaft, and the free end of the scraper connecting rod is connected to the connecting rod, the rotating shaft passes through the cover plate and extends into the leaching chamber, the scraper is located in the leaching chamber and is fixedly connected to the rotating shaft, so that when the connecting rod drives the scraper connecting rod to swing, the scraper is driven to swing through the rotating shaft, and the foam discharge outlet is correspondingly arranged to the scraper setting so that the foam is discharged from the foam discharge outlet driven by the scraper.

4. The wet leaching tank according to claim 3, characterized in that: The scraper includes an axial sub-plate and a radial sub-plate connected to each other. The radial sub-plate extends radially along the leaching chamber and is connected to the rotating shaft. The axial sub-plate is arranged at one end of the radial sub-plate away from the rotating shaft and is arranged at an angle to the radial sub-plate.

5. The wet leaching tank according to claim 3, characterized in that: The cover plate is provided with a fixing bracket, and the defoaming driving member and the fixing end are both mounted on the fixing bracket.

6. The wet leaching tank according to any one of claims 1 to 5, characterized in that: The stirring structure includes a stirring drive, a stirring frame and a stirring shaft. The stirring frame is installed on the cover plate, and the stirring shaft passes through the cover plate and extends into the leaching chamber. The stirring drive is installed on the stirring frame and is used to drive the stirring shaft to rotate. A stirring blade is provided at the bottom end of the stirring shaft.

7. The wet leaching tank according to claim 6, characterized in that: The number of the stirring blades is multiple, and the multiple stirring blades are arranged on the stirring shaft at intervals along the vertical direction.

8. The wet leaching tank according to any one of claims 1 to 5, characterized in that: A liquid level sensor is arranged on the side groove wall of the leaching tank, and a controller is also arranged on the cover plate. The liquid level sensor and the defoaming driving component are both electrically connected to the controller, and the controller is used for controlling the defoaming driving component to start when the liquid level sensor is triggered.

9. The wet leaching tank according to any one of claims 1 to 5, characterized in that: The side tank wall of the leaching tank is provided with a turbulent plate along its circumference.

10. The wet leaching tank according to any one of claims 1 to 5, characterized in that: The cover plate is provided with an observation port, and the observation port is covered with a transparent plate.

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