A desulfurization device and process for lead paste recycling of lead-acid batteries

Abstract

This invention discloses a desulfurization device and process for lead-acid battery recycling, relating to the field of lead-acid battery recycling lead-acid paste desulfurization technology. The desulfurization device includes a desulfurization reactor and a filter press. The desulfurization reactor is equipped with a stirring shaft for mixing lead-acid paste and a desulfurizing agent, and also includes a turning mechanism. The turning mechanism includes a scraper and a spraying mechanism. The scraper is fitted at the bottom of the desulfurization reactor and rotates around the axis of the stirring shaft to scoop up the lead-acid paste particles that have settled at the bottom of the reactor. During the stirring and rotation of the stirring shaft, the scraper scoops up the lead-acid paste particles settled at the bottom of the reactor, and the spraying mechanism intermittently sprays liquid from bottom to top, assisting the lifted lead-acid paste particles to flow upwards and diffuse, promoting the mixing and reaction of the lead-acid paste and the desulfurizing agent, thus improving reaction efficiency.

Description

Technical Field

[0001] This invention relates to the field of lead paste desulfurization technology for lead-acid battery recycling, and particularly to a lead paste desulfurization device and process for lead-acid battery recycling. Background Technology

[0002] Waste lead-acid batteries are the main raw material for recycled lead production. Lead paste accounts for about 40% to 50% of the total battery mass, and its main components are lead sulfate, lead dioxide, lead oxide, and a small amount of metallic lead. In traditional pyrometallurgical processes, if sulfur-containing lead paste is directly fed into the furnace, the lead sulfate will decompose at high temperatures, producing a large amount of sulfur dioxide flue gas. This not only increases the burden of desulfurization of the exhaust gas but also wastes sulfur resources. Therefore, desulfurization of lead paste is very important.

[0003] The current mainstream method for desulfurizing lead paste is wet conversion, which usually uses sodium carbonate or ammonium bicarbonate as desulfurizing agent. The sodium carbonate or ammonium bicarbonate reacts with the lead paste slurry in a stirred reactor to generate lead carbonate precipitate and sodium sulfate or ammonium sulfate solution. The desulfurized lead paste is then obtained through solid-liquid separation.

[0004] However, the density of solid particles in lead paste is generally high (lead sulfate has a density of approximately 6.2 g / cm³, and lead dioxide approximately 9.4 g / cm³), far exceeding the density of desulfurization liquid (1.1–1.2 g / cm³), and their particle size distribution is also wide, ranging from 1 to 200 μm. In conventional stirred reactors, these high-density particles settle rapidly under gravity, easily accumulating at the bottom to form a sediment layer. This prevents the lead sulfate in the sediment layer from fully contacting the desulfurizing agent, leading to incomplete local reactions and a decrease in the overall desulfurization rate. Therefore, effectively inhibiting the bottom deposition of lead paste particles is a crucial problem that urgently needs to be solved to achieve efficient desulfurization. Summary of the Invention

[0005] The purpose of this invention is to provide a desulfurization device and process for lead paste used in lead-acid battery recycling, so as to solve the technical problem that lead paste settling at the bottom affects the desulfurization reaction efficiency in the existing technology.

[0006] The technical problem to be solved by this invention can be achieved through the following technical solution: A desulfurization device for lead-acid battery recycling includes a desulfurization reactor and a filter press; the desulfurization reactor is equipped with a stirring shaft for stirring lead paste and desulfurizing agent, and also includes a material turning mechanism; The material turning mechanism includes a scraper and a liquid spraying mechanism; the scraper is fitted at the bottom of the desulfurization reactor and rotates around the axis of the stirring shaft to scoop up the lead paste particles that have settled at the bottom of the desulfurization reactor; the liquid spraying mechanism includes spray holes evenly distributed on the scraper, which are used to intermittently spray desulfurizing agent liquid upwards, causing the scooped-up lead paste particles to diffuse and flow upwards.

[0007] Preferably, the spraying mechanism includes a piston cylinder and a pressure cylinder; the piston cylinder is coaxially fixed at the bottom of the stirring shaft, the scraper is fixedly connected to one side of the bottom of the piston cylinder, and a liquid outlet check valve is connected between the scraper and the bottom of the piston cylinder; the stirring shaft is a hollow structure, and the pressure cylinder is disposed inside the stirring shaft, the pressure cylinder is slidably inserted into the piston cylinder, and a support spring is connected between the pressure cylinder and the piston cylinder; a liquid inlet check valve is provided on one side of the top of the pressure cylinder; the material turning mechanism also includes a drive mechanism for driving the pressure cylinder to reciprocate relative to the piston cylinder.

[0008] Preferably, the driving mechanism includes a fixed ring and a lifting plate; the lifting plate is coaxially aligned above the stirring shaft and fixedly connected to the pressure cylinder; the fixed ring is fixedly connected to the inner top of the desulfurization reactor; multiple undulating guide blocks are fixedly connected circumferentially at equal intervals on the fixed ring, and rollers that cooperate with the undulating guide blocks are rotatably connected to both sides of the lifting plate.

[0009] Preferably, a filter screen is installed on the inlet side of the liquid inlet check valve.

[0010] Preferably, the stirring shaft is provided with a cleaning scraper that cooperates with the filter screen, and the cleaning scraper rotates synchronously with the stirring shaft. During the axial movement of the pressure cylinder relative to the stirring shaft, the cleaning scraper and the filter screen are scraped together.

[0011] Preferably, the desulfurization device further includes an impact mechanism, which includes a swing box and a swing mechanism for driving the swing box to swing back and forth. The swing box is fixedly connected to a shaft on the side near the stirring shaft, and the shaft is rotatably connected to the outer wall of the stirring shaft. The swing box is positioned above the material turning mechanism, and the swing box is a trapezoidal box body. Impact protrusions are distributed on the inner wall of the swing box.

[0012] Preferably, the oscillating mechanism includes a swing arm, a drive wheel, and an eccentric rod. A wheel frame is fixedly connected to one side of the bottom of the stirring shaft. The drive wheel is rotatably connected to the wheel frame and contacts the inner wall of the desulfurization reactor. The eccentric rod is vertically connected to one side of the drive wheel. The swing arm is arranged parallel above the oscillating box, and one end of the swing arm is fixedly connected to the shaft. A strip-shaped hole is opened at the other end, and the eccentric rod passes through the strip-shaped hole.

[0013] Preferably, the stirring shaft includes stirring blades and a hollow rotating sleeve, the hollow rotating sleeve rotating inside the desulfurization reactor; the stirring blades are provided in multiple pieces and are uniformly fixed on the outer wall of the hollow rotating sleeve.

[0014] Preferably, the forward side of the scraper is provided with a transition inclined guide surface.

[0015] A desulfurization process for lead paste used in lead-acid battery recycling includes the following specific steps: The first step is to put the recovered lead paste and desulfurizing agent into the desulfurization reactor, and set the reaction temperature and stirring speed of the stirring shaft. The second step involves using the scraper of the material turning mechanism to scoop up the lead paste particles deposited at the bottom of the desulfurization reactor, and then using the spray nozzles to intermittently spray desulfurizing agent liquid upwards, causing the scooped-up lead paste particles to spread and flow upwards. The third step involves using a pump to transport the reacted slurry to a filter press, where filtration produces filtrate and filter cake. The filtrate is then sent to a sodium sulfate recovery system for further processing, while the filter cake is sent to the subsequent smelting process.

[0016] The beneficial effects of this invention are: 1. During the stirring and rotation process of the stirring shaft of the present invention, the scraper set up to scoop up the lead paste particles that have settled at the bottom of the desulfurization reactor, and the spray mechanism intermittently sprays liquid from bottom to top, which helps the lead paste particles carried up to flow upward and spread out, so as to promote the mixing and reaction of lead paste and desulfurizing agent and improve reaction efficiency.

[0017] 2. During the rotation of the stirring shaft of this invention, the lifting plate rotates accordingly and relies on the rollers distributed on both sides to roll along the surface of the fixed ring. The rollers and the undulating guide blocks distributed circumferentially on the fixed ring work together to achieve up and down starting. In this way, the lifting plate drives the pressure cylinder to move up and down relative to the piston cylinder. Each time the pressure cylinder rises, it draws desulfurizing agent from the outside through the liquid inlet one-way valve. When it descends, it pressurizes and delivers desulfurizing agent liquid, which facilitates the intermittent spraying of desulfurizing agent liquid through the spray hole to assist the lead paste particles to rise. There is no need to separately control the spray hole of the spraying mechanism for spraying operation, making the operation simple and reliable.

[0018] 3. During the rotation of the stirring shaft of the present invention, the driving wheel rolls circumferentially along the inner wall of the desulfurization reactor. During the rolling of the driving wheel, the eccentric rod and the strip hole on the swing arm cooperate to make the eccentric rod drive the swing box to swing back and forth. During the swing, the swing box relies on the impact protrusions distributed on the inner wall to continuously impact the rising lead paste particles, so as to break and separate the lead carbonate produced by the surface reaction, which is conducive to the continuous reaction of the lead paste particles.

[0019] 4. In this invention, the rising lead paste particles pass through the reciprocating oscillating box, which allows the lead paste particles to further diffuse into the desulfurizing agent through the oscillation action, thus facilitating the improvement of the overall reaction efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure in which the stirring shaft and the desulfurization reactor are connected in this invention; Figure 3 yes Figure 2 A magnified schematic diagram of the local structure at point A; Figure 4 This is a schematic diagram of the relative positional cooperation between the scraper and the swing box in this invention; Figure 5 This is a schematic diagram of the structure in which the drive wheel and the swing arm are connected in this invention; Figure 6 This is a cross-sectional schematic diagram of the swing box in this invention; Figure 7 This is a schematic diagram of the scraper in this invention; Figure 8 This is a schematic diagram showing the relative positional distribution of the drive mechanism and the stirring shaft in this invention; Figure 9 This is a schematic diagram of the structure in which the drive mechanism and the pressure cylinder are connected in this invention; Figure 10 This is a schematic diagram of the structure in which the pressure cylinder and the piston cylinder are connected in this invention; Figure 11 yes Figure 10 A magnified schematic diagram of the local structure at point B; Figure 12 This is a schematic diagram of the structure in which the roller and the undulating guide block are configured in cooperation in this invention.

[0021] Explanation of reference numerals in the attached figures: 1. Desulfurization reactor; 11. Stirring shaft; 111. Stirring blade; 112. Hollow rotating sleeve; 2. Filter press; 3. Impact mechanism; 31. Drive wheel; 32. Shaft; 33. Swing box; 34. Eccentric rod; 35. Swing arm; 351. Strip hole; 4. Turning mechanism; 41. Scraper; 411. Transition inclined guide surface; 42. Spray hole; 43. Drive mechanism; 431. Fixing ring; 432. Undulating guide block; 433. Roller; 434. Lifting plate; 44. Pressure cylinder; 45. Piston cylinder; 46. Liquid inlet check valve; 461. Filter screen; 462. Cleaning scraper; 47. Support spring. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0023] like Figures 1 to 12As shown, a lead paste desulfurization device for lead-acid battery recycling is used to desulfurize the lead paste in the recycled batteries. The desulfurization device includes a desulfurization reactor 1 and a filter press 2. The desulfurization reactor 1 is equipped with a stirring shaft 11 for stirring the lead paste and desulfurizing agent. The desulfurization reactor 1 is used to hold the lead paste obtained from the crushing and sorting of waste batteries and the desulfurizing agent, so that the liquid-solid ratio is 2:1. Then, the reaction is stirred under a certain temperature condition. Sodium carbonate (Na2CO3, soda ash) or ammonium carbonate ((NH4)2CO3) can be used as the desulfurizing agent. The reaction formula is as follows: PbSO4+Na2CO3→PbCO3↓+Na2SO4PbSO4+Na2CO3→PbCO3↓+Na2SO4 During this process, the sulfate ions in lead sulfate are replaced by carbonate ions, forming lead carbonate precipitate with extremely low solubility, while the sulfate ions enter the liquid phase in the form of sodium sulfate.

[0024] The reacted slurry is pumped into filter press 2 for filtration to obtain desulfurization filtrate and filter cake. The filter cake is mainly composed of lead carbonate, with small amounts of lead dioxide and lead monoxide mixed in. The filter cake is then sent to the subsequent smelting process.

[0025] The desulfurization device also includes a material turning mechanism 4, which includes a scraper 41 and a liquid spraying mechanism. The scraper 41 is fitted to the bottom of the desulfurization reactor 1. The scraper 41 rotates around the axis of the stirring shaft 11 and scoops up the lead paste particles that have settled at the bottom of the desulfurization reactor 1. The liquid spraying mechanism includes spray holes 42 that are evenly distributed on the scraper 41. The spray holes 42 are used to intermittently spray desulfurizing agent liquid upward, which drives the scooped-up lead paste particles to diffuse upward and flow, so as to facilitate a full reaction. A desulfurization process for lead paste used in lead-acid battery recycling includes the following specific steps: First, the recovered lead paste and desulfurizing agent are added into the desulfurization reactor 1 to make the liquid-solid ratio 2:1, and the reaction temperature and stirring speed of the stirring shaft 11 are set. The second step involves using the scraper 41 of the material turning mechanism 4 to scoop up the lead paste particles deposited at the bottom of the desulfurization reactor 1, and using the spray hole 42 to intermittently spray the desulfurizing agent liquid upwards, causing the scooped-up lead paste particles to spread and flow upwards. The third step involves using a pump to deliver the reacted slurry to filter press 2, where filtration is applied to obtain filtrate and filter cake. The filtrate is then sent to a sodium sulfate recovery system for further processing, while the filter cake is sent to the subsequent smelting process.

[0026] In some specific implementation schemes, refer to Figures 9 to 11As shown, the spraying mechanism includes a piston cylinder 45 and a pressure cylinder 44. The piston cylinder 45 is coaxially fixed at the bottom of the stirring shaft 11, and a scraper 41 is fixedly connected to one side of the bottom of the piston cylinder 45. A liquid outlet check valve is connected between the scraper 41 and the bottom of the piston cylinder 45, and the inside of the scraper 41 is a cavity communicating with the liquid outlet check valve. The spray hole 42 communicates with the cavity inside the scraper 41. The liquid outlet check valve allows liquid to flow only from the piston cylinder 45 to the cavity inside the scraper 41. The stirring shaft 11 is a hollow structure, and the pressure cylinder 44 is equipped with... The pressure cylinder 44 is slidably inserted into the piston cylinder 45 inside the stirring shaft 11, and a stretchable support spring 47 is connected between the pressure cylinder 44 and the piston cylinder 45. The top of the pressure cylinder 44 is a closed section, and the bottom is an opening communicating with the piston cylinder 45. A liquid inlet check valve 46 is provided on one side of the top of the pressure cylinder 44, which allows liquid outside the pressure cylinder 44 to flow into it. The material turning mechanism 4 also includes a drive mechanism 43 for driving the pressure cylinder 44 to reciprocate relative to the piston cylinder 45.

[0027] Among them, reference Figure 8 , Figure 9 and Figure 12As shown, the drive mechanism 43 includes a fixed ring 431 and a lifting plate 434. The lifting plate 434 is coaxially aligned above the stirring shaft 11 and is fixedly connected to the pressure cylinder 44 via a connecting rod. It should be noted that a stirring drive motor is installed at the top of the desulfurization reactor 1. The main shaft of the stirring drive motor extends into the top of the desulfurization reactor 1, and a guide frame is fixedly connected to the end of the main shaft. The guide frame may include two parallel guide rods, which slide through the lifting plate 434 and are fixedly connected to the piston cylinder 45. The stirring shaft 11 is also... The guide rod is fixedly connected, thus ensuring that both the stirring shaft 11 and the piston cylinder 45 are fixedly positioned relative to the main shaft of the stirring drive motor and can be driven to rotate by the stirring drive motor. The fixing ring 431 is fixedly connected to the inner top of the desulfurization reactor 1 by a bracket, and the central axis of the fixing ring 431 coincides with the central axis of the stirring shaft 11. Multiple undulating guide blocks 432 are fixedly connected circumferentially at equal intervals to the fixing ring 431. The undulating guide blocks 432 can be right-angled triangular blocks, and the number of them is even. Both sides of the lifting plate 434 are rotatably connected to the undulating guide blocks. With rollers 433 engaging with 432, and the undulating guide block 432 being a right-angled triangular block, the lifting plate 434 rotates synchronously with the stirring shaft 11. During this process, the rollers 433 distributed on both sides of the lifting plate 434 roll along the surface of the fixed ring 431, and each time they contact the right-angled triangular block-shaped undulating guide block 432, they first roll along the inclined surface of the right-angled triangular block from low to high. During this process, the lifting plate 434 carries the pressure cylinder 44 upward relative to the piston cylinder 45 by a certain distance. During this process, the support spring 47 is stretched to generate a rebound force, and... During this process, the space between the pressure cylinder 44 and the piston cylinder 45 increases, and the inlet check valve 46 facilitates the entry of external liquid into the space between the pressure cylinder 44 and the piston cylinder 45. When the roller 433 rolls past the highest position of the undulating guide block 432, it will suddenly fall. During this process, the pressure cylinder 44 is pressed down relative to the piston cylinder 45 by the rebound force of the support spring 47, so that the pressurized internal liquid can enter the scraper 41 from the outlet check valve and be sprayed upward through the spray hole 42. By repeating this process, intermittent spraying of liquid from bottom to top can be achieved.

[0028] In some specific implementations, to prevent lead paste particles from entering and causing blockages each time the one-way valve 46 draws in external liquid, refer to... Figure 11 As shown, a filter screen 461 is installed on the inlet side of the liquid inlet check valve 46.

[0029] In addition, to prevent the filter screen 461 from becoming clogged due to continuous filtration, a cleaning scraper 462 is provided inside the stirring shaft 11 to cooperate with the filter screen 461. The cleaning scraper 462 rotates synchronously with the stirring shaft 11. During the axial movement of the pressure cylinder 44 relative to the stirring shaft 11, the cleaning scraper 462 scrapes against the filter screen 461, thus facilitating the cleaning of the surface of the filter screen 461 during this process. It should be noted that the cleaning scraper 462 can be made of high-temperature and corrosion-resistant rubber material, which can be selected based on the composition of the desulfurizing agent.

[0030] In some specific implementation schemes, to facilitate the removal of some of the lead carbonate produced on the surface of the rising lead paste particles during the reaction process, thus promoting a sustained overall reaction, please refer to the following details. Figure 3 As shown, the desulfurization device also includes an impact mechanism 3. The impact mechanism 3 includes a swing box 33 and a swing mechanism for driving the swing box 33 to swing back and forth. The swing box 33 is fixedly connected to a shaft 32 on the side near the stirring shaft 11. The shaft 32 is parallel to the axis of the stirring shaft 11 and is rotatably connected to the outer wall of the stirring shaft 11. Specifically, a boss can be provided on the outer wall of the stirring shaft 11 for the stirring shaft 11 to connect. The swing box 33 is positioned above the material turning mechanism 4, specifically above the scraper 41. The swing box 33 is a trapezoidal box, that is, the longitudinal section is a trapezoidal surface, and both the top and bottom are open. Impact protrusions are distributed on the inner wall of the swing box 33, that is, the microstructure of the protrusions is processed.

[0031] It should be noted that, in order to ensure that the lead paste particles can enter the swing box 33 when they are driven upward by the liquid sprayed from the nozzle 42, the bottom port surface of the swing box 33 can be set to be large. This ensures that when the swing box 33 swings back and forth in the horizontal plane, its bottom port surface always covers the top of the scraper 41. In this way, the rising lead paste particles can enter the swing box 33. Then, due to the back and forth swing of the swing box 33, the impact protrusions distributed on its inner wall can continuously impact the lead paste particles, breaking down and separating the lead carbonate generated on the surface of the lead paste particles to a certain extent. The lead paste particles eventually pass through the top of the swing box 33. As the swing box 33 swings back and forth, it can also promote the further diffusion of the rising lead paste particles, which is beneficial for dispersing them in the desulfurizing agent for reaction.

[0032] In a further specific implementation plan, combined with Figure 3 and Figure 4As shown, the swing mechanism includes a swing arm 35, a drive wheel 31, and an eccentric rod 34. A wheel frame is fixedly connected to one side of the bottom of the stirring shaft 11. The drive wheel 31 is rotatably connected to the wheel frame and contacts the inner wall of the desulfurization reactor 1. During the rotation of the stirring shaft 11, the drive wheel 31 rolls circumferentially along the inner wall of the desulfurization reactor 1. The eccentric rod 34 is vertically fixedly connected to one side of the drive wheel 31, i.e., eccentrically set. The swing arm 35 is arranged parallel above the swing box 33, and one end of the swing arm 35 is fixedly connected to the shaft 32. The other end has a strip hole 351, through which the eccentric rod 34 passes. It should also be noted that the length of the strip hole 351 is more than twice the distance between the center of the eccentric rod 34 and the center of the drive wheel 31.

[0033] When the stirring shaft 11 rotates and stirs inside the desulfurization reactor 1, the driving wheel 31 rolls along the inner wall of the desulfurization reactor 1. The rotating driving wheel 31 drives the eccentric rod 34 to rotate around its axle. During the rotation, the eccentric rod 34 slides relative to the strip hole 351 and slides back and forth along the strip hole 351. During this process, the eccentric rod 34 squeezes the swing arm 35 to swing back and forth. The swing arm 35 drives the swing box 33 to swing back and forth through the shaft 32.

[0034] It should be noted that the eccentric rod 34 can be rotatably mounted on the drive wheel 31 to facilitate its rolling within the strip hole 351.

[0035] In addition, the swing arm 35 can be configured to be flat and have cutting edges on both sides, so that the swing arm 35 can cut the lead paste particles discharged from the top of the swing box 33, which facilitates further reaction of the lead paste particles.

[0036] In some specific embodiments, the stirring shaft 11 includes stirring blades 111 and a hollow rotating sleeve 112, which rotates inside the desulfurization reactor 1. Specifically, the hollow rotating sleeve 112 can be fixedly connected to the main shaft of the stirring motor via a guide rod. Both the upper and lower ends of the hollow rotating sleeve 112 are open, and the pressure cylinder 44 is located inside the hollow rotating sleeve 112. The piston cylinder 45 extends out from the bottom of the hollow rotating sleeve 112. The cleaning scraper 462 can be directly fixedly connected to the inner wall of the hollow rotating sleeve 112. The wheel frame is fixedly connected to the outer wall of the hollow rotating sleeve 112, and the shaft 32 is rotatably connected to the outer wall of the hollow rotating sleeve 112. Multiple stirring blades 111 are provided and are evenly fixedly arranged on the outer wall of the hollow rotating sleeve 112.

[0037] In some specific implementation schemes, refer to Figure 7As shown, the scraper 41 has a transition inclined guide surface 411 on its forward side. The edge of the transition inclined guide surface 411 is the blade side. During the rotation of the scraper 41 with the stirring shaft 11, the scraper 41 scrapes up the lead paste particles deposited at the bottom of the desulfurization reactor 1 and guides them through the transition inclined guide surface 411 to flow to the location of the nozzle 42, so that the fluid sprayed through the nozzle 42 can flow upward and diffuse.

[0038] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios: First, lead paste and desulfurizing agent obtained from the crushing and sorting of waste batteries are added into desulfurization reactor 1 in proportion. Stirring shaft 11 stirs the mixed lead paste and desulfurizing agent to make them react. During the stirring process of the stirring shaft 11, the scraper 41 rotates around the axis of the stirring shaft 11 and scoops up the lead paste particles that have settled at the bottom of the desulfurization reactor 1. Guided by the transition inclined guide surface 411 distributed on the scraper 41, the scooped lead paste particles flow to the top of the spray hole 42.

[0039] The lifting plate 434 rotates synchronously with the stirring shaft 11. During this process, the rollers 433 distributed on both sides of the lifting plate 434 roll along the surface of the fixed ring 431. Each time they come into contact with the right-angled triangular block-shaped undulating guide block 432, they first roll along the inclined surface of the right-angled triangular block from low to high. During this process, the lifting plate 434 carries the pressure cylinder 44 upward relative to the piston cylinder 45 by a certain distance. During this process, the support spring 47 is stretched to generate a rebound force. Also, during this process, due to the increase in space between the pressure cylinder 44 and the piston cylinder 45, the liquid inlet check valve... 46 facilitates the entry of external liquid into the space between the pressure cylinder 44 and the piston cylinder 45; when the roller 433 rolls past the highest position of the undulating guide block 432, it will suddenly fall. During this process, the pressure cylinder 44 is pressed down relative to the piston cylinder 45 by the rebound force of the support spring 47, so that the pressurized internal liquid can enter the scraper 41 from the liquid outlet check valve and be sprayed upward through the spray hole 42. This is repeated to achieve intermittent liquid spraying from bottom to top, which facilitates the continued effective upward flow of the shoveled lead paste particles, which is conducive to the reaction.

[0040] When the stirring shaft 11 rotates and stirs inside the desulfurization reactor 1, the driving wheel 31 rolls along the inner wall of the desulfurization reactor 1. The rotating driving wheel 31 drives the eccentric rod 34 to rotate around its axle. During the rotation, the eccentric rod 34 slides relative to the strip hole 351 and slides back and forth along the strip hole 351. During this process, the eccentric rod 34 squeezes the swing arm 35 to swing back and forth. The swing arm 35 drives the swing box 33 to swing back and forth through the shaft 32. The rising lead paste particles can enter the swing box 33. Then, due to the back and forth swing of the swing box 33, the impact protrusions distributed on its inner wall can continuously impact the lead paste particles, which can break and separate the lead carbonate generated on the surface of the lead paste particles to a certain extent. The lead paste particles eventually pass through the top of the swing box 33. As the swing box 33 swings back and forth, it can also promote the further diffusion of the rising lead paste particles, which is beneficial for dispersing them in the desulfurizing agent for reaction.

[0041] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A desulfurization device for lead-acid battery recycling, comprising a desulfurization reactor (1) and a filter press (2); wherein the desulfurization reactor (1) is provided with a stirring shaft (11) for stirring the lead paste and desulfurizing agent, characterized in that, It also includes a material turning mechanism (4); The material turning mechanism (4) includes a scraper (41) and a liquid spraying mechanism; the scraper (41) is fitted to the inner bottom of the desulfurization reactor (1), the scraper (41) rotates around the axis of the stirring shaft (11) and scoops up the lead paste particles that have settled at the bottom of the desulfurization reactor (1); the liquid spraying mechanism includes spray holes (42) evenly distributed on the scraper (41), the spray holes (42) are used to intermittently spray desulfurizing agent liquid upward, driving the scooped lead paste particles to diffuse upward.

2. The lead paste desulfurization device for lead-acid battery recycling according to claim 1, characterized in that, The spraying mechanism includes a piston cylinder (45) and a pressure cylinder (44); the piston cylinder (45) is coaxially fixed at the bottom of the stirring shaft (11), the scraper (41) is fixedly connected to one side of the bottom of the piston cylinder (45), and a liquid outlet check valve is connected between the scraper (41) and the bottom of the piston cylinder (45); the stirring shaft (11) is a hollow structure, and the pressure cylinder (44) is located inside the stirring shaft (11), the pressure cylinder (44) is slidably inserted into the piston cylinder (45), and a support spring (47) is connected between the pressure cylinder (44) and the piston cylinder (45); a liquid inlet check valve (46) is provided on one side of the top of the pressure cylinder (44); the material turning mechanism (4) also includes a drive mechanism (43) for driving the pressure cylinder (44) to reciprocate relative to the piston cylinder (45).

3. The lead paste desulfurization device for lead-acid battery recycling according to claim 2, characterized in that, The drive mechanism (43) includes a fixed ring (431) and a lifting plate (434); the lifting plate (434) is coaxially aligned above the stirring shaft (11) and fixedly connected to the pressure cylinder (44); the fixed ring (431) is fixedly connected to the inner top of the desulfurization reactor (1); a plurality of undulating guide blocks (432) are fixedly connected circumferentially at equal intervals on the fixed ring (431), and rollers (433) that cooperate with the undulating guide blocks (432) are rotatably connected to both sides of the lifting plate (434).

4. The lead paste desulfurization device for lead-acid battery recycling according to claim 2, characterized in that, A filter screen (461) is installed on the inlet side of the liquid inlet check valve (46).

5. A desulfurization device for lead-acid battery recycling according to claim 4, characterized in that, The stirring shaft (11) is equipped with a cleaning scraper (462) that cooperates with the filter screen (461). The cleaning scraper (462) rotates synchronously with the stirring shaft (11). During the axial movement of the pressure cylinder (44) relative to the stirring shaft (11), the cleaning scraper (462) scrapes against the filter screen (461).

6. A desulfurization device for lead-acid battery recycling according to claim 1, characterized in that, It also includes an impact mechanism (3), which includes a swing box (33) and a swing mechanism for driving the swing box (33) to swing back and forth. The swing box (33) is fixedly connected to a shaft (32) on the side near the stirring shaft (11), and the shaft (32) is rotatably connected to the outer wall of the stirring shaft (11). The swing box (33) is positioned above the material turning mechanism (4), and the swing box (33) is a trapezoidal box. Impact protrusions are distributed on the inner wall of the swing box (33).

7. A desulfurization device for lead-acid battery recycling according to claim 6, characterized in that, The swing mechanism includes a swing arm (35), a drive wheel (31), and an eccentric rod (34). A wheel frame is fixedly connected to one side of the bottom of the stirring shaft (11). The drive wheel (31) is rotatably connected to the wheel frame and is in contact with the inner wall of the desulfurization reactor (1). The eccentric rod (34) is vertically connected to one side of the drive wheel (31). The swing arm (35) is arranged parallel above the swing box (33). One end of the swing arm (35) is fixedly connected to the shaft (32), and the other end is provided with a strip hole (351). The eccentric rod (34) passes through the strip hole (351).

8. A desulfurization device for lead-acid battery recycling according to claim 1, characterized in that, The stirring shaft (11) includes stirring blades (111) and a hollow rotating sleeve (112). The hollow rotating sleeve (112) rotates inside the desulfurization reactor (1). The stirring blades (111) are provided in multiple pieces and are uniformly fixed on the outer wall of the hollow rotating sleeve (112).

9. A desulfurization device for lead-acid battery recycling according to claim 1, characterized in that, The scraper (41) has a transition inclined guide surface (411) on its forward side.

10. A desulfurization process for lead-acid battery recycling lead paste, implemented by a lead-acid battery recycling lead paste desulfurization device according to any one of claims 1 to 9, characterized in that, The specific steps are as follows: First step: First, put the recovered lead paste and desulfurizing agent into the desulfurization reactor (1), and set the reaction temperature and the stirring speed of the stirring shaft (11); The second step involves using the scraper (41) of the material turning mechanism (4) to scoop up the lead paste particles deposited at the bottom of the desulfurization reactor (1), and using the spray hole (42) to intermittently spray the desulfurizing agent liquid upwards, causing the scooped-up lead paste particles to spread upwards. The third step is to transport the reacted slurry to the filter press (2) by a pump, and obtain filtrate and filter cake by filtration. The filtrate is sent to the sodium sulfate recovery system for treatment; the filter cake is sent to the subsequent smelting process.

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