Process for recovering metals from spent aluminum electrolyte and scrap frame slag and water immersion equipment

Abstract

This invention provides a process and water leaching equipment for the co-recovery of metals from waste aluminum electrolyte and lepidolite impurity removal plate and frame slag, relating to the field of metal resource recovery technology. The process includes the following steps: Step S1, crushing and sieving the waste aluminum electrolyte and lepidolite impurity removal plate and frame slag separately, and then drying them for later use. This solution ultimately achieves the co-processing of these two seemingly unrelated industrial wastes. Through a rationally designed process flow, it achieves the graded recovery of metals such as lithium, sodium, and aluminum. The recovery processes of each metal are independent yet closely related, enabling the simultaneous recovery of multiple metals from both wastes. This breaks through the limitations of previous separate treatment of these two wastes, broadens the approach to comprehensive utilization of industrial waste, and improves the overall utilization rate of resources.

Description

Technical Field

[0001] This invention relates to the field of metal resource recycling, and in particular to a process and water immersion equipment for the co-recovery of metals from waste aluminum electrolyte and impurity removal plate frame slag. Background Technology

[0002] The aluminum electrolysis production process generates a large amount of waste aluminum electrolyte. The main components of this waste aluminum electrolyte include elements such as aluminum, fluorine, sodium, and lithium. Lithium exists in the form of sodium lithium cryolite, and with the increasing use of low-grade bauxite in aluminum electrolysis, the lithium content in waste aluminum electrolyte is trending upwards. Currently, most companies do not pay enough attention to waste aluminum electrolyte. Large-scale storage not only occupies space but also wastes resources and poses potential environmental risks. Furthermore, traditional processes for lithium extraction from waste aluminum electrolyte, such as acid leaching, generate large amounts of HF, leading to severe equipment corrosion and significant environmental hazards. Some processes involving high-temperature calcination are energy-intensive and place stringent demands on equipment.

[0003] In the production of lithium carbonate from lepidolite, the impurity residue from the acid leaching brine contains lithium carbonate and calcium carbonate. Currently, there are limited methods for treating this residue, and most fail to achieve efficient recovery of valuable elements such as lithium, resulting in a waste of lithium resources.

[0004] Therefore, it is necessary to provide a process and water immersion equipment for the co-recovery of metals from waste aluminum electrolyte and impurity removal plate frame slag to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides a process and water leaching equipment for the co-processing of metals from waste aluminum electrolyte and impurity removal plate and frame slag. This solves the problem that existing processes are not convenient for the co-processing of waste aluminum electrolyte and lepidolite impurity removal plate and frame slag, thus hindering the efficient recovery of metals such as lithium, sodium, and aluminum.

[0006] To solve the above-mentioned technical problems, the process for co-recovering metals from waste aluminum electrolyte and impurity removal plate frame slag provided by the present invention includes the following steps:

[0007] Step S1: Crush and sieve the waste aluminum electrolyte and lithium mica impurity removal plate frame slag separately, and dry them after sieving for later use.

[0008] Step S2: Mix and roast the dried waste aluminum electrolyte and the lepidolite impurity removal plate frame slag in a certain proportion, so that the fluorine element in the waste aluminum electrolyte and the calcium element in the lepidolite impurity removal plate frame slag can form calcium fluoride solid, and the water-insoluble cryolite can decompose.

[0009] Step S3: Transfer the calcined product to a water immersion device and use ultrasonic-assisted water immersion. After water immersion, filter to obtain filter residue A and filtrate A. Add deionized water to filter residue A, wash until pH is neutral, and dry it to use as a building material.

[0010] Step S4: Add sodium hydroxide to filtrate A to adjust the pH value, and transfer it to a constant temperature water bath for stirring and reaction, so that aluminum element is precipitated in the form of aluminum hydroxide. After filtration, filtrate B and filter residue B are obtained. Filter residue B is dried and calcined to obtain alumina product.

[0011] Step S5: Add sodium hydroxide to filtrate B to adjust the pH value, and then pass it through an ion exchange resin to remove residual calcium, magnesium and other metal impurities to obtain purified liquid. Evaporate and concentrate the purified liquid, and add saturated sodium phosphate solution dropwise to carry out lithium precipitation reaction. Separate the solid and liquid to obtain filtrate C and filter residue C. After washing filter residue C with water, dry it to obtain battery-grade lithium phosphate.

[0012] Step S6: Add calcium chloride to filtrate C. After reacting for a period of time, calcium phosphate precipitate is generated. After the reaction is completed, filter to obtain filtrate D and filter residue D, whose main component is calcium phosphate. Filtrate D is evaporated and crystallized to obtain sodium chloride product.

[0013] Water immersion equipment, including immersion tank, sealing cover, hopper and annular feeding mechanism;

[0014] The annular feeding mechanism includes a feeding cone disposed within a sealing cover and a hopper. A rotating shaft is vertically disposed inside the hopper. The bottom end of the rotating shaft passes through the top of the feeding cone and extends into the leaching tank. A conical seat is fixedly disposed on the circumferential side of the rotating shaft and at the top of the feeding cone. Two rotating seats are rotatably connected to the bottom of the conical seat. Rollers are rotatably connected to the inner sides of the two rotating seats. The bottoms of the two rollers are in contact with the top of the feeding cone. Four reciprocating rods are vertically slidably connected inside the sealing cover. Springs are sleeved on the surface of the four reciprocating rods and at the top of the sealing cover. A striking block is fixedly disposed at the top of the four reciprocating rods. The bottom ends of the four reciprocating rods are fixedly connected to the top of the feeding cone.

[0015] Preferably, the sealing cover is disposed on the top of the leaching tank and is fixedly connected to the leaching tank by bolts. The hopper is fixed to the top of the sealing cover by bolts. The sealing cover has a circular through hole inside that cooperates with the feeding cone.

[0016] Preferably, the feeding cone has a through hole inside that works with the rotating shaft, and the top of the feeding cone has a groove that works with two rollers. When the two rollers rotate to the groove position at the top of the feeding cone, the expansion of the spring will drive the reciprocating rod and the feeding cone to move upward, thereby sealing the circular through hole inside the sealing cover with the feeding cone.

[0017] Preferably, a feeding auxiliary mechanism is fixedly provided at the bottom of the feeding cone. The feeding auxiliary mechanism includes a sleeve fixedly provided at the bottom of the feeding cone. Toothed plates are fixedly provided on both sides of the sleeve. Two sets of rotating brackets are fixedly provided at the bottom of the sealing cover. Rotating shafts are longitudinally rotatably connected inside the two sets of rotating brackets. Annular tubes are fixedly provided on the surface of the two rotating shafts. Spray nozzles are connected to the surface of the two annular tubes. Gears are fixedly provided on the surface of the two rotating shafts and inside the two annular tubes. The two gears mesh with the two toothed plates respectively. Multifunctional plates are fixedly provided at the front and rear ends of the left rotating shaft.

[0018] Preferably, the centers of the two annular tubes and the center of the feeding cone are on the same vertical line, the sleeve is fitted on the circumferential side of the rotating shaft, the interior of the multifunctional plate is a metal mesh, and an arc-shaped return plate is provided at the bottom.

[0019] Preferably, a dispersing mechanism is fixed inside the silo. The dispersing mechanism includes a screen plate fixed inside the silo. The rotating shaft is rotatably connected to the screen plate. A connecting plate is fixed on the circumferential side of the rotating shaft and at the top of the screen plate. Three connecting plates are fixed at the bottom of the connecting plate. A dispersing soft plate is fixed at the bottom of each of the three connecting plates.

[0020] Preferably, a stirring mechanism is fixed on the surface of the rotating shaft and inside the leaching tank. The stirring mechanism includes three sets of stirring blades fixed on the circumferential side of the rotating shaft. A top plate is fixed on the top of the hopper. A drive motor for driving the rotating shaft to rotate is provided on the top of the top plate. A feeding port is opened inside the top plate.

[0021] Preferably, the left side of the leaching tank is connected to a water inlet pipe, the right side of the leaching tank is connected to an exhaust pipe, the bottom of the leaching tank is connected to a discharge pipe, four connecting seats are arranged in a ring array on the periphery of the leaching tank, and the bottom of each of the four connecting seats is fixed with a support leg. Multiple baffles are arranged in a ring array on the inner wall of the leaching tank.

[0022] Compared with related technologies, the process and water leaching equipment for the synergistic recovery of metals from waste aluminum electrolyte and impurity removal plate frame slag provided by this invention have the following beneficial effects:

[0023] By co-processing two seemingly unrelated industrial wastes—waste aluminum electrolyte and lithium mica impurity removal plate frame slag—a rationally designed process is employed to achieve graded recovery of metals such as lithium, sodium, and aluminum. The recovery processes for each metal are independent yet closely interconnected, enabling the simultaneous recovery of multiple metals from both wastes. This approach breaks through the limitations of treating these two wastes separately, broadens the scope of comprehensive utilization of industrial waste, improves resource utilization efficiency, and produces high-purity products with significant economic value. The entire process is green and environmentally friendly, generating minimal waste and meeting the requirements of sustainable development. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the process flow provided for this invention;

[0026] Figure 2 The optimal structural schematic diagram provided for this invention;

[0027] Figure 3 for Figure 2 The diagram shows a structural schematic of the cross-sectional view of the silo.

[0028] Figure 4 for Figure 2 The diagram shows a cross-sectional view of the leaching tank.

[0029] Figure 5 This is a schematic diagram of the planar cross-sectional view of the annular feeding mechanism provided by the present invention;

[0030] Figure 6 for Figure 5 The enlarged structural diagram at point A is shown below;

[0031] Figure 7 A schematic diagram of the dispersing mechanism provided by the present invention;

[0032] Figure 8 A schematic diagram showing the state in which the rotating shaft of the present invention drives the conical seat to rotate, causing the feeding cone to move upward;

[0033] Figure 9 This is a schematic diagram of the feeding auxiliary mechanism provided by the present invention;

[0034] Figure 10 A schematic diagram showing the state in which the sleeve drives two toothed plates to move upward, causing two gears to drive two rotating axes to rotate in opposite directions, as provided by the present invention.

[0035] Figure 11 This is a schematic diagram of the stirring mechanism provided by the present invention.

[0036] Explanation of icon numbers:

[0037] 1. Leaching tank; 2. Sealing cap; 3. Material hopper;

[0038] 4. Circular feeding mechanism; 41. Feeding cone; 42. Rotating shaft; 43. Conical seat; 44. Rotating seat; 45. Roller; 46. Reciprocating rod; 47. Spring; 48. Striking block;

[0039] 5. Feeding auxiliary mechanism; 51. Sleeve; 52. Toothed plate; 53. Rotating bracket; 54. Rotating shaft; 55. Annular tube; 56. Nozzle; 57. Gear; 58. Multifunctional panel;

[0040] 6. Dispersion mechanism; 61. Sieve plate; 62. Connecting disc; 63. Connecting plate; 64. Dispersion plate;

[0041] 7. Stirring mechanism; 71. Stirring paddle; 72. Drive motor;

[0042] 8. Top slab;

[0043] 9. Water inlet pipe; 10. Exhaust pipe; 11. Discharge pipe; 12. Connecting seat; 13. Support leg; 14. Baffle. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0045] This invention provides a process for the co-recovery of metals from waste aluminum electrolyte and impurity removal plate frame slag.

[0046] Please see Figure 1 The process for co-recovering metals from waste aluminum electrolyte and impurity-removing plate and frame slag includes the following steps:

[0047] Step S1: The waste aluminum electrolyte and lithium mica impurity removal plate frame slag are crushed by a vibrating mill, ground by a planetary ball mill and then sieved. After sieving, they are dried for later use.

[0048] Preferably, the waste aluminum electrolyte and the lithium mica impurity removal plate frame slag are crushed by a vibratory mill, ground by a planetary ball mill and then passed through a 200-sieve. After passing through the sieve, they are dried at 105°C for 6 hours for later use.

[0049] Step S2: Mix the dried waste aluminum electrolyte and the lepidolite impurity removal plate frame slag in a certain proportion and put them into a muffle furnace for roasting. This allows the fluorine element in the waste aluminum electrolyte to react with the calcium element in the lepidolite impurity removal plate frame slag to form calcium fluoride solid, and the water-insoluble cryolite to decompose, creating favorable conditions for the subsequent leaching of non-ferrous metals.

[0050] Preferably, the dried waste aluminum electrolyte and the lithium mica impurity removal plate frame slag are mixed in a mass ratio of 1:3 and placed in a muffle furnace and heated to 450°C at a heating rate of 5°C / min for 3 hours.

[0051] Step S3: Transfer the calcined product to a water immersion tank and use ultrasonic-assisted immersion. Control the ultrasonic frequency at 45-60kHz, the water immersion temperature at 60-80℃, and the immersion time at 1-2h. Use ultrasonic cavitation to improve the leaching rate of lithium, sodium, and aluminum. After immersion, filter to obtain filter residue A and filtrate A. Add deionized water to filter residue A according to a certain solid-liquid ratio, wash until the pH is neutral, and dry it. It can be used as a building material.

[0052] Preferably, the ultrasonic frequency is controlled at 45kHz, the water immersion temperature is 60℃, and the water immersion time is 2h. By utilizing the cavitation effect of ultrasonic waves, the leaching rate of lithium, sodium and aluminum elements is effectively improved. Deionized water is added to filter residue A at a solid-liquid ratio of 1:3, and the residue is washed until the pH is neutral. After drying, it can be used as a building raw material, such as for preparing concrete aggregates and bricks, thereby realizing the resource utilization of solid waste.

[0053] Step S4: Add sodium hydroxide to filtrate A, adjust the pH value to 6-7, and transfer it to a constant temperature water bath. Stir the reaction at a specific temperature to precipitate aluminum in the form of aluminum hydroxide. After filtration, filtrate B and filter residue B are obtained. Filter residue B is dried and transferred to a muffle furnace and calcined for a period of time to obtain alumina product.

[0054] Preferably, the pH value is adjusted to 6, and the mixture is transferred to a constant temperature water bath and reacted at 60°C for 2 hours with a stirring speed of 350 rpm. After filtration, filtrate B and filter residue B are obtained. Filter residue B is dried and transferred to a muffle furnace and calcined at 550°C for 2 hours with a temperature of 5°C / min to obtain alumina product.

[0055] Step S5: Add sodium hydroxide to filtrate B to adjust the pH to 9-11. Then, pass it through an ion exchange resin to remove residual calcium, magnesium and other metal impurities to obtain a purified solution. Evaporate and concentrate the purified solution to control the lithium content in the concentrate to 15-17 g / L. Slowly add saturated sodium phosphate solution to the concentrate at a coefficient of 1.1 and transfer it to a constant temperature water bath. Stir at a specific temperature to carry out the lithium precipitation reaction. Separate the solid and liquid to obtain filtrate C and filter residue C. Add deionized water to filter residue C according to a certain solid-liquid ratio, wash it three times, and dry it to obtain battery-grade lithium phosphate.

[0056] Preferably, sodium hydroxide is added to filtrate B to adjust the pH to 10, and the lithium content in the concentrate is controlled at 17 g / L. Saturated sodium phosphate solution is slowly added to the concentrate at a coefficient of 1.1, and the concentrate is transferred to a constant temperature water bath and stirred at 350 rpm at 90°C for 3 hours to carry out the lithium precipitation reaction. Solid-liquid separation is performed to obtain filtrate C and filter residue C. Deionized water is added to filter residue C at a solid-liquid ratio of 1:3.

[0057] Step S6: Add calcium chloride to filtrate C and transfer it to a constant temperature water bath. Stir and react at a specific temperature for a period of time to generate calcium phosphate precipitate. After the reaction is completed, filter to obtain filtrate D and filter residue D whose main component is calcium phosphate. Filtrate D is evaporated and crystallized to obtain sodium chloride product.

[0058] Preferably, the mixture is transferred to a constant temperature water bath and reacted at 90°C for 2 hours with a stirring speed of 350 rpm to generate calcium phosphate precipitate.

[0059] In this embodiment, two seemingly unrelated industrial wastes, waste aluminum electrolyte and lithium mica impurity removal plate frame slag, are co-processed. Through a rationally designed process flow, the graded recovery of metals such as lithium, sodium, and aluminum is achieved. The recovery processes of each metal are independent yet closely related, enabling the simultaneous recovery of multiple metals from the two types of wastes. This breaks through the limitations of treating these two types of wastes separately in the past, broadens the ideas for the comprehensive utilization of industrial wastes, improves the comprehensive utilization rate of resources, and produces products with high purity and high economic value. The entire process is green and environmentally friendly, generating less waste and meeting the requirements of sustainable development.

[0060] The present invention also provides a water immersion device.

[0061] First embodiment:

[0062] Please see Figure 2 , Figure 3 , Figures 5 to 8 The water immersion equipment includes an immersion tank 1, a sealing cover 2, a hopper 3, and a ring feeding mechanism 4;

[0063] The annular feeding mechanism 4 includes a feeding cone 41 disposed within the sealing cover 2 and the hopper 3. A rotating shaft 42 is vertically disposed inside the hopper 3. The bottom end of the rotating shaft 42 passes through the top of the feeding cone 41 and extends into the leaching tank 1. A conical seat 43 is fixedly disposed on the circumferential side of the rotating shaft 42 and at the top of the feeding cone 41. Two rotating seats 44 are rotatably connected to the bottom of the conical seat 43. Rollers 45 are rotatably connected to the inner side of each of the two rotating seats 44. The bottom of the two rollers 45 contacts the top of the feeding cone 41. Four reciprocating rods 46 are vertically slidably connected inside the sealing cover 2. Springs 47 are sleeved on the surface of each of the four reciprocating rods 46 and at the top of the sealing cover 2. A striking block 48 is fixedly disposed at the top of each of the four reciprocating rods 46. The bottom ends of the four reciprocating rods 46 are fixedly connected to the top of the feeding cone 41.

[0064] The sealing cover 2 is located on the top of the leaching tank 1 and is fixedly connected to the leaching tank 1 by bolts. The hopper 3 is fixed to the top of the sealing cover 2 by bolts. The sealing cover 2 has a circular through hole inside that cooperates with the feeding cone 41.

[0065] The feeding cone 41 has a through hole inside that works with the rotating shaft 42. The top of the feeding cone 41 has a groove that works with two rollers 45. When the two rollers 45 rotate to the groove position at the top of the feeding cone 41, the expansion of the spring 47 will drive the reciprocating rod 46 and the feeding cone 41 to move upward, and the feeding cone 41 will seal the circular through hole inside the sealing cover 2.

[0066] Please combine Figure 5 , Figure 6 and Figure 8 The drive motor 72 is started, and its rotation drives the rotating shaft 42 to rotate. The rotating shaft 42 rotates, which in turn drives the conical seat 43 to rotate. The rotating seat 43 then drives the rotating seat 44 and the roller 45 to rotate. When the bottom of the roller 45 contacts the groove at the top of the feeding cone 41 and continues to rotate, the expansion force of the spring 47 drives the four reciprocating rods 46 and the feeding cone 41 to move upward, thereby sealing the sealing cover 2 and preventing the roasted material from falling into the leaching tank. 1. When the four reciprocating rods 46 move upward, they will simultaneously drive the striking block 48 to move upward. After the feeding cone 41 seals the sealing cover 2, the upward movement of the striking block 48 will strike the peripheral side of the hopper 3, causing the material adhering to the inner wall of the hopper 3 to fall into the bottom of the hopper 3. The vibration generated by the striking block 48 during the striking process will be transmitted to the bottom of the feeding cone 41 through the reciprocating rods 46, causing the material remaining on the surface of the feeding cone 41 to fall into the leaching tank 1, thus preventing the material from adhering to the surface of the feeding cone 41.

[0067] Furthermore, when the bottom of the roller 45 contacts the bottom of the groove at the top of the feeding cone 41 and continues to rotate, the roller 45 will press the feeding cone 41 downward, and the feeding cone 41 will move downward to cancel the seal on the sealing cover 2, so that the roasted material falls on the surface of the feeding cone 41 and falls into the leaching tank 1 in a ring-shaped dispersion along the surface of the feeding cone 41. When the feeding cone 41 moves downward, it will simultaneously drive the four reciprocating rods 46 and the striking block 48 to move downward, causing the spring 47 to contract.

[0068] Furthermore, the rotating shaft 42 continuously drives the conical seat 43, the rotating seat 44 and the roller 45 to rotate, thereby causing the feeding cone 41 to move up and down reciprocally, causing the sealing cover 2 to open and close intermittently, and using the striking block 48 to intermittently strike the hopper 3, thereby intermittently feeding the roasted material into the leaching tank 1.

[0069] Preferably, the roasted material is in powder form with a porous surface. When water is immersed at a temperature of 60-80℃, water vapor will be generated, and the roasted material will absorb the water vapor. By feeding the material in a ring-shaped dispersed manner, the product after roasting can be prevented from absorbing water vapor and agglomerating. Intermittently opening and closing the sealing cover 2 for feeding can prevent water vapor from entering the hopper 3.

[0070] Preferably, the leaching tank 1 is a circular jacketed leaching reaction tank, and ultrasonic auxiliary equipment is provided on the side.

[0071] In this embodiment, the roller 45 is driven to rotate continuously by the rotating shaft 42. With the cooperation of the groove at the top of the feeding cone 41, the feeding cone 41 moves up and down. When the feeding cone 41 moves upward and seals the sealing cover 2, it can block the air passage between the hopper 3 and the leaching tank 1, so that the powder is in a dry and sealed state in the hopper 3 and cannot come into contact with moisture. This fundamentally inhibits the phenomenon of powder absorbing moisture, agglomerating and arching. When the feeding cone 41 moves upward, it will simultaneously drive the striking block 48 to move upward and strike the outer wall of the hopper 3. The powder adhering to the hopper 3 will fall off, and the vibration force generated by the striking will be transmitted to the feeding cone 41 through the reciprocating rod 46, so that the powder on the surface of the feeding cone 41 will completely fall off into the leaching tank 1, ensuring smooth conveying.

[0072] For porous, lightweight roasted powders that easily absorb moisture, when the feeding cone 41 moves downward to open the sealing cover 2, the powder will fall in a ring along the surface of the feeding cone 41 and be fully dispersed upon entering the water body. This can avoid the problems of local accumulation, settling, or excessively high local concentration caused by straight pipe feeding.

[0073] Second embodiment:

[0074] Please see Figure 4 , Figure 9 and Figure 10The bottom of the feeding cone 41 is fixedly provided with a feeding auxiliary mechanism 5. The feeding auxiliary mechanism 5 includes a sleeve 51 fixedly provided at the bottom of the feeding cone 41. Both sides of the sleeve 51 are fixedly provided with toothed plates 52. The bottom of the sealing cover 2 is fixedly provided with two sets of rotating brackets 53. The interior of the two sets of rotating brackets 53 is longitudinally rotatably connected with a rotating shaft 54. The surface of the two rotating shafts 54 is fixedly provided with annular tubes 55. The surface of the two annular tubes 55 is connected to a nozzle 56. The surface of the two rotating shafts 54 and the inner side of the two annular tubes 55 are fixedly provided with gears 57. The two gears 57 mesh with the two toothed plates 52 respectively. The front end and rear end of the left rotating shaft 54 ​​are fixedly provided with multi-functional plates 58.

[0075] The centers of the two annular tubes 55 and the center of the feeding cone 41 are on the same vertical line. The sleeve 51 is fitted on the circumferential side of the rotating shaft 42. The interior of the multifunctional plate 58 is a metal mesh, and an arc-shaped return plate is provided at the bottom.

[0076] Preferably, the roasted material is usually at a very high temperature. Directly immersing it in water will cause violent boiling or even steam explosion. Even if the surface temperature of the material has dropped to 100-150°C, if there are still closed pores inside the particles with high temperature, the water in the pores will vaporize and expand after encountering water, which will also cause the particles to break and splash.

[0077] Preferably, the lithium mica residue may contain a small amount of organic flotation reagents or carbon-containing substances from the waste aluminum electrolyte. These substances have surface activity and will form foam. In addition, the roasted material may contain a small amount of carbonates, which will release CO2 when they come into contact with acid, further increasing the formation of foam.

[0078] Preferably, the annular pipe 55 is connected to an inlet hose for supplying deionized water to the annular pipe 55;

[0079] Please combine Figure 9 and Figure 10 When the feeding cone 41 moves upward to seal the sealing cover 2, the feeding cone 41 will simultaneously drive the sleeve 51 to move upward. The upward movement of the sleeve 51 will then drive the two toothed plates 52 to move upward. The upward movement of the two toothed plates 52 will drive the two gears 57 to rotate in opposite directions. The rotation of the two gears 57 will then drive the two rotating shafts 54 to rotate, causing the two annular tubes 55 to rotate downward, adjusting the working angle of the nozzle 56 downward, and using the nozzle 56 to defoam the foam.

[0080] Furthermore, when the feeding cone 41 moves downward and opens the sealing cover 2, allowing the roasted material to fall into the leaching tank 1, the feeding cone 41 will simultaneously drive the sleeve 51 to move downward. The downward movement of the sleeve 51 will drive the two toothed plates 52 to move downward, and the two toothed plates 52 will then drive the two gears 57 and the rotating shaft 54 ​​to rotate in opposite directions, thereby resetting the two annular tubes 55 and aligning the working angle of the nozzle 56 with the powder in the feed, thereby pre-wetting the powder, reducing its activity, preventing high temperatures inside the powder from causing particle breakage and splashing during the leaching process, and avoiding the problem of dust flying.

[0081] In this embodiment, when the feeding cone 41 completes intermittent feeding and moves upward to seal the sealing cover 2, it simultaneously drives the sleeve 51 and toothed plate 52 to move upward. With the cooperation of the gear 57 and the rotating shaft 54, the two annular tubes 55 drive the nozzle 56 to rotate downward. The nozzle 56 sprays deionized water to defoam the foam that appears during the leaching reaction. When the feeding cone 41 moves downward and opens the sealing cover 2 to feed, it simultaneously drives the sleeve 51 and toothed plate 52 to move downward. With the cooperation of the gear 57 and the rotating shaft 54, the two annular tubes 55 and the nozzle 56 are reset, so that the working angle of the nozzle 56 is aligned with the powder in the feed, pre-wetting the powder, removing the heat from the surface of the powder, and penetrating into the surface pores to balance the internal and external pressure, eliminate thermal shock, and prevent cracking and splashing.

[0082] Third embodiment:

[0083] Please see Figure 2 , Figure 4 , Figure 5 , Figure 7 and Figure 11 The hopper 3 is equipped with a dispersing mechanism 6. The dispersing mechanism 6 includes a screen plate 61 fixed inside the hopper 3. The rotating shaft 42 is rotatably connected to the screen plate 61. A connecting plate 62 is fixed on the circumferential side of the rotating shaft 42 and at the top of the screen plate 61. Three connecting plates 63 are fixed at the bottom of the connecting plate 62. A dispersing soft plate 64 is fixed at the bottom of each of the three connecting plates 63.

[0084] A stirring mechanism 7 is fixedly installed on the surface of the rotating shaft 42 and inside the leaching tank 1. The stirring mechanism 7 includes three sets of stirring paddles 71 fixed on the circumferential side of the rotating shaft 42. A top plate 8 is fixedly installed on the top of the hopper 3. A drive motor 72 for driving the rotating shaft 42 to rotate is provided on the top of the top plate 8. A feeding port is opened inside the top plate 8.

[0085] The leaching tank 1 has a water inlet pipe 9 connected to the left side, an exhaust pipe 10 connected to the right side, a discharge pipe 11 connected to the bottom of the leaching tank 1, four connecting seats 12 arranged in a ring on the periphery of the leaching tank 1, and a support leg 13 fixed to the bottom of each of the four connecting seats 12. The inner wall of the leaching tank 1 has a plurality of baffles 14 arranged in a ring.

[0086] Preferably, the water inlet pipe 9 is used to deliver deionized water into the leaching tank 1;

[0087] Please combine Figure 5 and Figure 7 When the rotating shaft 42 rotates, it will simultaneously drive the connecting disc 62 to rotate. The rotation of the connecting disc 62 will in turn drive the connecting plate 63 and the dispersing plate 64 to rotate. With the cooperation of the sieve plate 61, the roasted material is dispersed and fed.

[0088] Please combine Figure 11 When the rotating shaft 42 rotates, it will simultaneously drive the stirring paddle 71 to rotate, and the rotation of the stirring paddle 71 will mix the roasted material and deionized water.

[0089] Furthermore, the rotating shaft 42 drives the stirring paddle 71 to rotate, and when the slurry is mixed, a ring-shaped flow field is formed. When the powder falls into the flow field in a ring shape, it will be instantly dispersed by water.

[0090] Furthermore, the dispersing plate 64, the conical seat 43, and the stirring paddle 71 are driven by the same rotating shaft 42. When the powder is fed quickly, the stirring speed of the stirring paddle 71 will also increase. The feeding speed is proportional to the stirring speed, thereby completely avoiding the problem of powder agglomeration during the leaching process.

[0091] In this embodiment, when the rotating shaft 42 rotates, it will simultaneously drive the connecting plate 63 and the dispersing plate 64 to rotate. When used in conjunction with the sieve plate 61, it will prevent the powder from agglomerating into particles at the beginning of feeding. When the rotating shaft 42 rotates, it will simultaneously drive the stirring paddle 71 to rotate, so that the feeding speed of the powder is proportional to the stirring speed of the stirring paddle 71, thus completely avoiding the problem of agglomeration during the leaching process of the powder.

[0092] In one application scenario, the water immersion device can be used for the stabilization treatment of flue dust, which is typically composed of heavy metals and dioxins from waste incineration or metallurgical dust. It also has low density, large specific surface area, and strong adsorption capacity, making it prone to dust generation and water absorption and clumping during chemical stabilization.

[0093] When flue dust is stabilized, after the feeding cone 41 moves upward and is sealed, the hopper 3 becomes an independent closed space, preventing dust pollution from light fly ash during the feeding process. The nozzle 56 sprays the falling powder at the feeding port, which can wet the powder before it falls into the main water body, thus completely eliminating dust.

[0094] In another application, the water immersion device is used for the dissolution and dispersion of food or medicine, which often contain sugars or hydrophilic groups, such as milk powder, protein powder or traditional Chinese medicine extract powder. When directly added to water, these materials are prone to clumping, forming granules that are wet on the outside and dry on the inside.

[0095] When dissolving and dispersing food or medicine, the powder is spread out in a ring along the cone surface of the feeding cone 41, increasing the contact area between individual particles and the liquid surface, rather than clumping together and entering the water. Before the powder enters the water, it is micro-atomized and moistened by the nozzle 56, so that a water film is quickly formed on its surface and it can be quickly dispersed and dissolved after falling into the water.

[0096] Please refer to the reference again. Figures 2 to 11 The working principle of the water immersion device provided by this invention is as follows:

[0097] Step S1: The roasted material is fed into the top of the sieve plate 61 through the feeding port of the top plate 8. Then, the drive motor 72 is started. The drive motor 72 rotates and drives the rotating shaft 42 to rotate. The rotating shaft 42 rotates and drives the connecting plate 62 to rotate. The rotating plate 62 in turn drives the connecting plate 63 and the dispersing plate 64 to rotate. With the cooperation of the sieve plate 61, the roasted material is dispersed and fed, so that the powder falls in a ring on the surface of the top of the feeding cone 41.

[0098] In step S2, when the rotating shaft 42 rotates, it will simultaneously drive the conical seat 43, the rotating seat 44 and the roller 45 to rotate. When the bottom of the roller 45 contacts the groove at the top of the feeding cone 41 and continues to rotate, the expansion force of the spring 47 will cause the reciprocating rod 46 and the feeding cone 41 to move upward, thereby sealing the sealing cover 2 and preventing the roasted material from falling into the leaching tank 1. When the reciprocating rod 46 moves upward, it will simultaneously drive the striking block 48 to move upward. After the feeding cone 41 seals the sealing cover 2, the upward movement of the striking block 48 will strike the outer wall of the hopper 3, causing the material adhering to the inner wall of the hopper 3 to fall into the bottom of the hopper 3. The vibration generated by the striking block 48 during the striking process will be transmitted to the bottom of the feeding cone 41 through the reciprocating rod 46, causing the material remaining on the surface of the feeding cone 41 to fall into the leaching tank 1.

[0099] When the bottom of the roller 45 contacts the bottom of the groove at the top of the feeding cone 41 and continues to rotate, the roller 45 will press the feeding cone 41 downward. The feeding cone 41 moves downward, thereby canceling the seal on the sealing cover 2, so that the roasted material falls on the surface of the feeding cone 41 and falls into the leaching tank 1 in a ring-shaped dispersion along the surface of the feeding cone 41. The rotating shaft 42 continuously drives the cone seat 43, the rotating seat 44 and the roller 45 to rotate, thereby causing the feeding cone 41 to move up and down reciprocally, intermittently feeding the roasted material into the leaching tank 1.

[0100] In step S3, when the feeding cone 41 moves upward and seals the sealing cover 2, the feeding cone 41 will simultaneously drive the sleeve 51 to move upward. The upward movement of the sleeve 51 will then drive the two toothed plates 52 to move upward. The upward movement of the two toothed plates 52 will drive the two gears 57 to rotate in opposite directions. The rotation of the two gears 57 will then drive the two rotating shafts 54 to rotate, causing the two annular tubes 55 to rotate downward. This will adjust the working angle of the nozzle 56 downward, and the nozzle 56 will be used to defoam the foam.

[0101] In step S4, when the feeding cone 41 moves downward and opens the sealing cover 2, allowing the roasted material to fall into the leaching tank 1, the feeding cone 41 will simultaneously drive the sleeve 51 to move downward. The downward movement of the sleeve 51 will drive the two toothed plates 52 to move downward. The two toothed plates 52 will then drive the two gears 57 and the rotating shaft 54 ​​to rotate in opposite directions, thereby resetting the two annular tubes 55 and aligning the working angle of the nozzle 56 with the powder in the feed, thus pre-wetting the powder.

[0102] In step S5, when the rotating shaft 42 rotates, it will simultaneously drive the stirring paddle 71 to rotate. The rotation of the stirring paddle 71 is used to mix the roasted material and deionized water. The dispersing plate 64, the conical seat 43 and the stirring paddle 71 are driven by the same rotating shaft 42. When the powder is fed quickly, the stirring speed of the stirring paddle 71 will also increase. The feeding speed is proportional to the stirring speed.

[0103] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A process for the co-recovery of metals from waste aluminum electrolyte and impurity removal plate frame slag, characterized in that, Includes the following steps: Step S1: Crush and sieve the waste aluminum electrolyte and lithium mica impurity removal plate frame slag separately, and dry them after sieving for later use. Step S2: Mix and roast the dried waste aluminum electrolyte and the lepidolite impurity removal plate frame slag in a certain proportion, so that the fluorine element in the waste aluminum electrolyte and the calcium element in the lepidolite impurity removal plate frame slag can form calcium fluoride solid, and the water-insoluble cryolite can decompose. Step S3: Transfer the calcined product to a water immersion device and use ultrasonic-assisted water immersion. After water immersion, filter to obtain filter residue A and filtrate A. Add deionized water to filter residue A, wash until pH is neutral, and dry it to use as a building material. Step S4: Add sodium hydroxide to filtrate A to adjust the pH value, and transfer it to a constant temperature water bath for stirring and reaction, so that aluminum element is precipitated in the form of aluminum hydroxide. After filtration, filtrate B and filter residue B are obtained. Filter residue B is dried and calcined to obtain alumina product. Step S5: Add sodium hydroxide to filtrate B to adjust the pH value, and then pass it through an ion exchange resin to remove residual calcium, magnesium and other metal impurities to obtain purified liquid. Evaporate and concentrate the purified liquid, and add saturated sodium phosphate solution dropwise to carry out lithium precipitation reaction. Separate the solid and liquid to obtain filtrate C and filter residue C. After washing filter residue C with water, dry it to obtain battery-grade lithium phosphate. Step S6: Add calcium chloride to filtrate C. After reacting for a period of time, calcium phosphate precipitate is generated. After the reaction is completed, filter to obtain filtrate D and filter residue D, whose main component is calcium phosphate. Filtrate D is evaporated and crystallized to obtain sodium chloride product.

2. A water immersion device, characterized in that, The water leaching equipment is used in step S3 of the process for co-recovering metals from waste aluminum electrolyte and impurity removal plate frame slag as described in claim 1, during the water leaching of the roasted product, and includes a leaching tank, a sealing cover, a silo, and a ring feeding mechanism. The annular feeding mechanism includes a feeding cone disposed within a sealing cover and a hopper. A rotating shaft is vertically disposed inside the hopper. The bottom end of the rotating shaft passes through the top of the feeding cone and extends into the leaching tank. A conical seat is fixedly disposed on the circumferential side of the rotating shaft and at the top of the feeding cone. Two rotating seats are rotatably connected to the bottom of the conical seat. Rollers are rotatably connected to the inner sides of the two rotating seats. The bottoms of the two rollers are in contact with the top of the feeding cone. Four reciprocating rods are vertically slidably connected inside the sealing cover. Springs are fitted on the surface of the four reciprocating rods and at the top of the sealing cover. A striking block is fixedly disposed at the top of each of the four reciprocating rods. The bottom ends of the four reciprocating rods are fixedly connected to the top of the feeding cone.

3. The water immersion device according to claim 2, characterized in that, The sealing cover is located at the top of the leaching tank and is fixedly connected to the leaching tank by bolts. The hopper is fixed to the top of the sealing cover by bolts. The sealing cover has a circular through hole inside that cooperates with the feeding cone.

4. The water immersion device according to claim 2, characterized in that, The feeding cone has a through hole inside that works with the rotating shaft, and the top of the feeding cone has a groove that works with two rollers. When the two rollers rotate to the groove position at the top of the feeding cone, the expansion of the spring will drive the reciprocating rod and the feeding cone to move upward, and the feeding cone will seal the circular through hole inside the sealing cover.

5. The water immersion device according to claim 2, characterized in that, The bottom of the feeding cone is fixedly provided with a feeding auxiliary mechanism. The feeding auxiliary mechanism includes a sleeve fixedly provided at the bottom of the feeding cone. Both sides of the sleeve are fixedly provided with toothed plates. The bottom of the sealing cover is fixedly provided with two sets of rotating brackets. The interior of each set of rotating brackets is longitudinally rotatably connected with a rotating shaft. The surface of each of the two rotating shafts is fixedly provided with annular tubes. The surface of each of the two annular tubes is connected to a nozzle. Gears are fixedly provided on the surface of each of the two rotating shafts and inside the two annular tubes. The two gears mesh with the two toothed plates respectively. The front end and rear end of the left rotating shaft are fixedly provided with multi-functional plates.

6. The water immersion device according to claim 5, characterized in that, The centers of the two annular tubes and the center of the feeding cone are on the same vertical line. The sleeve is fitted onto the circumferential side of the rotating shaft. The interior of the multifunctional plate is a metal mesh, and an arc-shaped return plate is provided at the bottom.

7. The water immersion device according to claim 2, characterized in that, The hopper is equipped with a dispersing mechanism, which includes a screen plate fixed inside the hopper. The rotating shaft is rotatably connected to the screen plate. A connecting plate is fixed on the circumferential side of the rotating shaft and at the top of the screen plate. Three connecting plates are fixed at the bottom of the connecting plate. A dispersing soft plate is fixed at the bottom of each of the three connecting plates.

8. The water immersion device according to claim 2, characterized in that, A stirring mechanism is fixed on the surface of the rotating shaft and inside the leaching tank. The stirring mechanism includes three sets of stirring blades fixed on the circumferential side of the rotating shaft. A top plate is fixed on the top of the hopper. A drive motor for driving the rotating shaft to rotate is provided on the top of the top plate. A feeding port is opened inside the top plate.

9. The water immersion device according to claim 2, characterized in that, The leaching tank has a water inlet pipe connected to its left side, an exhaust pipe connected to its right side, and a discharge pipe connected to its bottom. The leaching tank has four connecting seats arranged in a ring array on its periphery, and each of the four connecting seats has a support leg fixed to its bottom. The leaching tank has multiple baffles arranged in a ring array on its inner wall.

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