Method for recovering lithium from roasting-sulfidation tailings and equipment therefor

Abstract

The application provides a lithium recovery method and recovery equipment based on roasting-sulfuration, and relates to the field of metal material recycling. The lithium recovery method based on roasting-sulfuration comprises the following steps: S1, mixing: grinding and mixing superfine tailings and auxiliary materials to obtain a mixture; S2, roasting pretreatment: placing the mixture in a high-temperature furnace and roasting at 600-1000 DEG C for 0.5-2 hours; S3, synergistic solidification of thallium and lithium leaching: carrying out leaching operation on the mixture subjected to roasting treatment according to a solid-liquid ratio of 1:1-1:5. The lithium recovery method based on roasting-sulfuration provided by the application realizes efficient solidification of thallium, takes into account efficient leaching of valuable lithium in superfine tailings, and through condition control and reaction design in the roasting pretreatment and synergistic stabilization process, thallium can be stably solidified, the leaching rate of lithium can reach 90%, and the thallium concentration can be as low as 0.005 mg / L, so that the dual goals of environmental friendliness and efficient resource utilization are achieved.

Description

Technical Field

[0001] This invention relates to the field of metal material recycling, and in particular to a method and equipment for recovering lithium from tailings based on roasting-sulfidation. Background Technology

[0002] Lithium-ion batteries are widely used in electric vehicles, energy storage systems, and other fields, leading to an explosive growth in demand for key metals such as lithium, cobalt, and nickel. With the continuous expansion of wind power generation, rare earth permanent magnet materials have become indispensable raw materials for core components of wind turbines. The efficient development and utilization of these key minerals in new energy have become a crucial cornerstone for the continuous progress of the new energy industry.

[0003] In the mining and beneficiation process of key minerals in new energy, raw ore processing is an extremely critical preliminary step; dissociation, crushing and desliming, as the core step, aims to dissociate the useful minerals in the raw ore from the gangue minerals and remove some muddy impurities, creating favorable conditions for subsequent beneficiation operations.

[0004] However, this process inevitably generates a large amount of ultrafine tailings, which contain metallic elements such as lithium and thallium. Lithium is recovered for use in the production of battery cathode materials, such as lithium carbonate. During the recovery process, these ultrafine tailings have extremely fine particle sizes, with most particles at the micrometer or even nanometer level, resulting in a huge specific surface area. This large specific surface area and strong adsorption capacity make harmful elements such as thallium (Tl) in the tailings readily leached in an acidic leaching environment. (Thallium is a highly toxic heavy metal element that can cause serious damage to the human nervous, digestive, and cardiovascular systems. Once it enters the environment, it poses a significant threat to ecosystems and human health.)

[0005] Existing research on thallium fixation largely focuses on solidifying thallium during the calcination process. These studies primarily revolve around optimizing calcination conditions and using additives, attempting to fix thallium within the mineral lattice or form stable compounds to reduce its leaching. For example, some studies have involved adding specific alkaline substances or metal oxides to induce a chemical reaction with thallium during high-temperature calcination, promoting its transformation into a stable crystal structure. However, most of these studies only focus on the calcination process itself, leaving the study of the thallium's speciation mechanism during calcination largely unexplored. This lack of in-depth understanding of thallium's speciation changes, migration patterns, and interactions with other components during calcination makes it difficult to develop efficient thallium stabilization technologies and effectively address the potential re-leaching of thallium in subsequent environmental media after calcination.

[0006] Therefore, while recovering lithium from ultrafine tailings, there is still room for improvement in the stable solidification and removal of harmful elements such as thallium (Tl).

[0007] Therefore, it is necessary to provide a method for recovering lithium from tailings based on roasting-sulfidation to solve the above-mentioned technical problems. Summary of the Invention

[0008] This invention provides a method for recovering lithium from tailings based on roasting-sulfurization, which solves the problem of stabilizing and removing harmful elements such as thallium (Tl) while recovering lithium from ultrafine tailings.

[0009] To solve the above-mentioned technical problems, the present invention provides a method for recovering lithium from tailings based on roasting-sulfidation, comprising the following steps:

[0010] S1. Mixing: Grind and mix the ultrafine tailings with the auxiliary materials to obtain the mixture;

[0011] S2. Calcination pretreatment: Place the mixture in a high-temperature furnace and calcine at 600~1000℃ for 0.5~2h.

[0012] S3, Synergistic solidification of thallium and lithium leaching: The calcined mixture is leached at a solid-liquid ratio of 1:1 to 1:5. During the leaching process, 5 to 20% sodium sulfide solution is added first and reacted for a preset time, followed by 10 to 30% lime milk and reacted for a preset time.

[0013] S4. Solid-liquid separation: After the reaction of the mixture in step S3 is completed, a lithium-containing solution is obtained through solid-liquid separation.

[0014] The excipients in S1 include one or more of sodium sulfate, calcium sulfate, calcium oxide, calcium carbonate, and sodium carbonate.

[0015] In S3, the sodium sulfide solution is added before the lime slurry, and the reaction interval is 5-30 minutes.

[0016] The present invention also provides an apparatus for recovering lithium from roasting-sulfurization tailings, used in the aforementioned method for recovering lithium from roasting-sulfurization tailings, comprising: a support frame;

[0017] A mixing cylinder, which is mounted on the bracket;

[0018] A stirring device, used to stir the materials in the mixing drum;

[0019] A discharge pipe, which is connected to the bottom end of the mixing cylinder;

[0020] A sealing device for sealing the bottom end of the mixing cylinder;

[0021] A filter assembly, comprising a rotating shaft, a driving device, and a filter structure, wherein the filter structure is rotatably mounted inside the discharge pipe via the rotating shaft and is located below the sealing device, and the driving device is used to drive the rotating shaft to rotate.

[0022] Preferably, the discharge pipe includes a main pipe and two branch pipes, the main pipe is connected to the bottom end of the mixing drum, and the two branch pipes are symmetrically installed at a preset angle at the bottom end of the main pipe;

[0023] The equipment for recovering lithium from roasting-sulfurization tailings also includes a guiding structure, which includes a drive shaft, a rotating device, and a guide plate. The guide plate is rotatably mounted between the two branch pipes via the drive shaft, and the rotating device is used to drive the drive shaft to rotate.

[0024] Preferably, the sealing device includes a push cylinder, a storage box, a connecting arm, and a valve plate. The push cylinder is installed on the main pipe, the storage box is connected to the top of one side of the main pipe, one end of the valve plate is slidably connected to the storage box, and the other end seals the bottom end of the mixing cylinder. The connecting arm connects the output end of the push cylinder and the valve plate.

[0025] Preferably, the driving device is a first gear, which is mounted on the rotating shaft and located outside the main tube;

[0026] The equipment for recovering lithium from roasting-sulfurization tailings also includes a driving device, which includes a driving frame and a first gear assembly. The driving frame is mounted on the connecting arm, and the first gear assembly is mounted on the top of the driving frame and aligned with the first gear.

[0027] Preferably, the rotating device is a second gear, which is mounted on the drive shaft and located outside the main tube. The drive device also includes a second set of teeth, which is mounted on the bottom of the drive frame.

[0028] When the push cylinder drives the valve plate to open via the connecting arm, after the drive frame drives the second tooth group to fully interact with the rotating device, the first tooth group interacts with the drive device.

[0029] Preferably, the equipment for recovering lithium from roasting-sulfurization tailings further includes a locking structure, which includes a connecting frame and a positioning shaft. The connecting frame is mounted on the drive frame, one end of the positioning shaft is horizontally mounted on the connecting frame, and the other end of the positioning shaft passes through the rotating shaft.

[0030] Preferably, the end of the positioning shaft facing the rotating shaft is tapered.

[0031] Compared with related technologies, the method for recovering lithium from tailings based on roasting-sulfidation provided by the present invention has the following beneficial effects:

[0032] This invention provides a method for recovering lithium from tailings based on roasting-sulfurization. Breaking away from the traditional method of simultaneously adding reagents, this invention employs a unique "sulfurization followed by calcification" procedure, effectively avoiding the formation of calcium oxides. 2+ With S 2- The direct reaction produces CaS, preventing the formation of S. 2- The ineffective consumption ensures S 2- Able to fully integrate with Tl 3+ The reaction generates Tl2S precipitate, which improves the utilization efficiency of the reagent and the stabilization effect of thallium; at the same time, the stepwise reaction mode also provides a more suitable environmental change process for lithium leaching, which helps to improve the lithium leaching rate.

[0033] Furthermore, the invention achieves dual objectives synergistically: while achieving efficient solidification of thallium, it also ensures efficient leaching of valuable lithium metal from ultrafine tailings. Through condition control and reaction design in the calcination pretreatment and synergistic stabilization processes, thallium can be stably solidified, while the lithium leaching rate can reach 90%, and the thallium concentration can be as low as 0.005 mg / L, thus achieving the dual objectives of environmental friendliness and efficient resource utilization. Attached Figure Description

[0034] Figure 1 This is a flowchart of the method for recovering lithium from tailings based on roasting-sulfidation provided by the present invention;

[0035] Figure 2 This is a schematic diagram of the equipment for recovering lithium from roasting-sulfidation tailings provided by the present invention;

[0036] Figure 3 This is a partial cross-sectional view of the equipment for recovering lithium from tailings based on roasting-sulfidation provided by the present invention.

[0037] Figure 4 This is a partial rear view of the equipment for recovering lithium from tailings based on roasting-sulfidation provided by the present invention.

[0038] Figure 5 for Figure 4 The diagram shows a plan view of an equipment for recovering lithium from roasting-sulfidation tailings.

[0039] Figure 6 for Figure 3 The enlarged schematic diagram of part A shown below;

[0040] Figure 7 A top view of the filter assembly provided by the present invention;

[0041] Figure 8This is a schematic diagram illustrating the principle of liquid discharge provided by the present invention, wherein, Figure 8 (a) is a schematic diagram showing the second set of teeth not engaged with the rotating mechanism. Figure 8 (b) is a schematic diagram of the valve plate sealing the bottom outlet of the mixing cylinder. Figure 8 Image (c) is a schematic diagram showing the second set of teeth just engaging with the rotating mechanism. Figure 8 (d) is a schematic diagram showing the valve plate partially opening to connect the mixing cylinder with the discharge pipe.

[0042] Figure 9 This is a schematic diagram illustrating the principle of liquid discharge provided by the present invention, wherein, Figure 9 (a) is a schematic diagram showing the complete interaction between the second set of teeth and the rotating mechanism. Figure 9 (b) is a schematic diagram showing the guide plate rotating to block the drain pipe. Figure 9 Image (c) is a schematic diagram showing the first tooth group fully engaged with the drive device. Figure 9 (d) is a schematic diagram of the filter structure after it has been flipped.

[0043] Numbering on the map:

[0044] 1. Bracket;

[0045] 2. Mixing drum;

[0046] 3. Stirring device; 31. Motor; 32. Stirring shaft; 33. Stirring blades;

[0047] 4. Discharge pipe; 41. Main pipe; 42. Branch pipe; 421. Support protrusion;

[0048] 5. Sealing device; 51. Push cylinder; 52. Storage box; 53. Connecting arm; 54. Valve plate;

[0049] 521. Slotted hole;

[0050] 6. Filter assembly; 61. Shaft; 62. Drive device; 63. Filter structure;

[0051] 7. Guide structure; 71. Drive shaft; 72. Rotating device; 73. Guide plate;

[0052] 8. Driving device; 81. Driving frame; 82. First tooth group; 83. Second tooth group;

[0053] 9. Locking structure; 91. Connecting frame; 92. Positioning shaft. Detailed Implementation

[0054] 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.

[0055] This invention provides a method for recovering lithium from tailings based on roasting-sulfurization.

[0056] Please refer to the following: Figure 1 In one embodiment of the present invention, the method for recovering lithium from roasting-sulfidation tailings includes the following steps:

[0057] S1. Mixing: Grind and mix the ultrafine tailings with the auxiliary materials to obtain the mixture;

[0058] S2. Calcination pretreatment: Place the mixture in a high-temperature furnace and calcine at 600~1000℃ for 0.5~2h.

[0059] S3, Synergistic solidification of thallium and lithium leaching: The calcined mixture is leached at a solid-liquid ratio of 1:1 to 1:5. During the leaching process, 5 to 20% sodium sulfide solution is added first and reacted for a preset time, followed by 10 to 30% lime milk and reacted for a preset time.

[0060] S4. Solid-liquid separation: After the reaction of the mixture in step S3 is completed, a lithium-containing solution is obtained through solid-liquid separation.

[0061] In step S2, the high-temperature environment induces a series of complex physicochemical reactions in the tailings, decomposing the organic complexes of thallium and releasing the low-valence Tl. + Oxidation to higher oxidation state Tl 3+ Simultaneously, the high temperature reconstructs the mineral lattice structure, allowing thallium to embed within the aluminosilicate framework, reducing its migration and bioavailability in the environment. Furthermore, the high temperature alters the structure of some minerals in the tailings, creating favorable conditions for subsequent lithium leaching.

[0062] This invention provides a method for recovering lithium from tailings based on roasting-sulfurization. Breaking away from the traditional method of simultaneously adding reagents, this invention employs a unique "sulfurization followed by calcification" procedure, effectively avoiding the formation of calcium oxides. 2+ With S 2- The direct reaction produces CaS, preventing the formation of S. 2- The ineffective consumption ensures S 2- Able to fully integrate with Tl 3+The reaction generates Tl2S precipitate, which improves the utilization efficiency of the reagent and the stabilization effect of thallium; at the same time, the stepwise reaction mode also provides a more suitable environmental change process for lithium leaching, which helps to improve the lithium leaching rate.

[0063] Furthermore, the invention achieves dual objectives synergistically: while achieving efficient solidification of thallium, it also ensures efficient leaching of valuable lithium metal from ultrafine tailings. Through condition control and reaction design in the calcination pretreatment and synergistic stabilization processes, thallium can be stably solidified, while the lithium leaching rate can reach 90%, and the thallium concentration can be as low as 0.005 mg / L, thus achieving the dual objectives of environmental friendliness and efficient resource utilization.

[0064] The resulting lithium-containing solution can then be used to prepare lithium carbonate and other materials for battery cathodes.

[0065] The excipients in S1 include one or more of sodium sulfate, calcium sulfate, calcium oxide, calcium carbonate, and sodium carbonate.

[0066] In S3, the sodium sulfide solution is added before the lime slurry, and the reaction interval is 5-30 minutes.

[0067] The present invention also provides Embodiment 1 and Comparative Examples 1-3, as detailed below:

[0068] Example 1

[0069] 1. Calcination pretreatment: Grind and mix ultrafine tailings with calcium sulfate and calcium carbonate in a certain proportion, and place them in a high-temperature furnace for high-temperature calcination at 900℃ for 1 hour.

[0070] 2. Synergistic solidification of thallium and lithium leaching: Ultrafine tailings that have undergone calcination treatment were leached at a solid-liquid ratio of 1:1. During the leaching process, 5% sodium sulfide solution was added first and reacted for 10 minutes, followed by the addition of 10% lime milk and reacted for 20 minutes. After the reaction was completed, the leachate was sent for testing. The thallium concentration was found to be 0.003 mg / L, and the lithium leaching rate was calculated to be 90.21%.

[0071] Comparative Example 1

[0072] 1. Calcination pretreatment: Grind and mix ultrafine tailings with calcium sulfate and calcium carbonate in a certain proportion, and place them in a high-temperature furnace for high-temperature calcination at 900℃ for 1 hour.

[0073] 2. Synergistic solidification of thallium and lithium leaching: The leaching was carried out at a solid-liquid ratio of 1:1 for 30 minutes. The leaching solution was sent for testing. The thallium concentration was found to be 0.8730 mg / L, and the lithium leaching rate was calculated to be 65.86%.

[0074] Comparative Example 2

[0075] 1. Calcination pretreatment: Grind and mix ultrafine tailings with calcium sulfate and calcium carbonate in a certain proportion, and place them in a high-temperature furnace for high-temperature calcination at 900℃ for 1 hour.

[0076] 2. Synergistic solidification of thallium and lithium leaching: The calcined ultrafine tailings were leached at a solid-liquid ratio of 1:1. During the leaching process, 5% sodium sulfide solution was added and reacted for 30 minutes. The leachate was then tested, and the thallium concentration was found to be 0.162 mg / L. The lithium leaching rate was calculated to be 75.31%.

[0077] Comparative Example 3

[0078] 1. Calcination pretreatment: Grind and mix ultrafine tailings with calcium sulfate and calcium carbonate in a certain proportion, and place them in a high-temperature furnace for high-temperature calcination at 900℃ for 1 hour.

[0079] 2. Synergistic solidification of thallium and lithium leaching: The ultrafine tailings that have undergone calcination treatment were leached at a solid-liquid ratio of 1:1. During the leaching process, 10% lime milk was added and reacted for 30 minutes. The leachate was then sent for testing. The thallium concentration was found to be 0.866 mg / L, and the lithium leaching rate was calculated to be 78.58%.

[0080] As can be seen from the above embodiments, the efficient solidification method for thallium in ultrafine tailings based on calcination-sulfidation synergistic stabilization provided by the present invention can stably and efficiently achieve the solidification of thallium and the leaching of lithium, and has good application prospects.

[0081] The present invention also provides a device for recovering lithium from tailings based on roasting-sulfurization.

[0082] Please see Figures 2 to 4 An apparatus for recovering lithium from roasting-sulfurization tailings, used in the method for recovering lithium from roasting-sulfurization tailings, includes: a support 1;

[0083] Mixing cylinder 2, which is mounted on the bracket 1;

[0084] A stirring device 3 is used to stir the materials in the mixing drum 2;

[0085] Discharge pipe 4, which is connected to the bottom end of the mixing cylinder 2;

[0086] A sealing device 5 is used to seal the bottom end of the mixing cylinder 2;

[0087] The filter assembly 6 includes a rotating shaft 61, a driving device 62, and a filter structure 63. The filter structure 63 is rotatably mounted inside the discharge pipe 4 via the rotating shaft 61 and is located below the sealing device 5. The driving device 62 is used to drive the rotating shaft 61 to rotate.

[0088] The equipment proposed in this embodiment for recovering lithium from roasting-sulfurization tailings is mainly used for the lithium leaching reaction in step S3 and the solid-liquid separation in step S4.

[0089] Specifically, the calcined mixture is placed in the mixing drum 2, and then 5% sodium sulfide solution is added to react with the mixture for 10 minutes. During the reaction, the stirring device 3 stirs the mixture solution, and then 10% lime milk is added to react for 20 minutes.

[0090] After the reaction is complete, the sealing device 5 opens the bottom outlet of the mixing cylinder 2. After the reaction material passes through the filter screen structure 63, the lithium-containing solution is discharged into the preset container through the discharge pipe 4, and solid materials such as Tl2S precipitate are filtered by the filter screen structure 63.

[0091] After the lithium-containing solution is completely discharged, the drive device 62 rotates the shaft 61, which in turn causes the filter structure 63 to flip, allowing the material on the filter structure 63 to be discharged through the discharge pipe 4 into a pre-set container.

[0092] In this process, the drive device 62 drives the filter structure 63 to rotate 90 degrees via the rotating shaft 61 and holds it for a period of time so that the material can be discharged quickly first. Then, the filter structure 63 is flipped 180 degrees so that the material can be completely discharged.

[0093] Therefore, the equipment can achieve solid-liquid separation and separate discharge of solid and liquid materials, making it convenient to use.

[0094] Furthermore, clean water can be added to the mixing cylinder 2 to backwash the filter structure 63, which can wash away any residual or embedded impurities on the filter structure 63 and extend the service life of the filter.

[0095] In this embodiment, the stirring device 3 includes a motor 31, a stirring shaft 32 and a plurality of stirring blades 33. The motor 31 is mounted on the bracket 1 and suspended above the mixing cylinder 2. One end of the stirring shaft 32 is mounted on the output shaft of the motor 31, and the other end extends into the interior of the mixing cylinder 2. The plurality of stirring blades 33 are mounted around the bottom end of the stirring shaft 32.

[0096] The filter structure 63 includes a mounting frame and a filter screen. The filter screen is installed inside the mounting frame. There are two rotating shafts 61, which are installed at both ends of the mounting frame. The two rotating shafts 61 pass through the discharge pipe 4 and extend to the outside of the discharge pipe 4. The joint between the rotating shaft 61 and the discharge pipe 4 is mechanically sealed.

[0097] The mounting frame is curved on both sides along the direction of rotation, thus enabling rotation.

[0098] Please see Figure 2 and Figure 3 In a preferred embodiment, the discharge pipe 4 includes a main pipe 41 and two branch pipes 42. The main pipe 41 is connected to the bottom end of the mixing cylinder 2, and the two branch pipes 42 are symmetrically installed at a preset angle at the bottom end of the main pipe 41.

[0099] The equipment for recovering lithium from roasting-sulfurization tailings also includes a guide structure 7, which includes a drive shaft 71, a rotating device 72, and a guide plate 73. The guide plate 73 is rotatably mounted between the two branch pipes 42 via the drive shaft 71, and the rotating device 72 is used to drive the drive shaft 71 to rotate.

[0100] For ease of subsequent description, the branch pipe 42 used to discharge the solution will be referred to as the liquid discharge pipe, and the branch pipe 42 used to discharge solid impurities will be referred to as the material discharge pipe.

[0101] By setting the discharge pipe 4 as a main pipe 41 and two branch pipes 42, the discharge pipe 4 forms an "inverted Y" shape, and a guide structure 7 is set to guide the solution to the drain pipe and the solid impurities to the discharge pipe. This allows the solution and solid impurities to be discharged separately, avoiding the solid impurities remaining on the pipe when discharged through the same pipe. When the solution flows out, it carries away the solid impurities, leaving solid impurities in the solution.

[0102] Furthermore, while guiding, the guide plate 73 also blocks the branch pipe 42 it is located in. That is, when discharging solid impurities, the guide plate 73 is tilted in the drain pipe and blocks the drain pipe; when discharging solution, the guide plate 73 is tilted in the discharge pipe and blocks the discharge pipe.

[0103] Please see Figure 3 The drive shaft 71 is located at the connection between the two branch pipes 42, with both ends passing through the branch pipes 42 and rotatably connected to them. A mechanical seal is used at the connection point. The guide plate 73 is sleeved on the drive shaft 71, and both the bottom and top ends of the guide plate 73 are connected to sealing sleeves. This ensures the sealing between the bottom end of the guide plate 73 and the inner wall of the connection between the two branch pipes 42, as well as the sealing between the top end of the guide plate 73 and the side wall of each branch pipe 42. At the same time, it increases the friction with the side wall of the branch pipe 42, improving the stability during guidance.

[0104] Among them, support protrusions 421 are provided on the side walls of both branch pipes 42. The support protrusions 421 can support the end of the guide plate 73 away from the drive shaft 71, thereby improving stability.

[0105] As another alternative in this embodiment, the discharge pipe 4 can also be set as a single pipe. After each discharge of solid impurities, the discharge pipe 4 can be rinsed by adding clean water into the mixing drum 2.

[0106] Please see Figure 3 and Figure 4 In this embodiment, the sealing device 5 includes a push cylinder 51, a storage box 52, a connecting arm 53, and a valve plate 54. The push cylinder 51 is mounted on the main pipe 41. The storage box 52 is connected to the top of one side of the main pipe 41. One end of the valve plate 54 is slidably connected to the storage box 52, and the other end seals the bottom end of the mixing cylinder 2. The connecting arm 53 connects the output end of the push cylinder 51 and the valve plate 54.

[0107] A strip hole 521 is provided on one side of the storage box 52, and a connecting shaft is horizontally provided at the top of the connecting arm 53. The connecting shaft passes through the strip hole 521 and is connected to the valve plate 54.

[0108] When it is necessary to open the valve plate 54 to connect the bottom end of the mixing cylinder 2 with the discharge pipe 4, the push cylinder 51 drives the valve plate 54 to move into the storage box 52 through the connecting arm 53, so that the valve plate 54 is separated from the bottom discharge port of the mixing cylinder 2; when sealing, the push cylinder 51 pushes the connecting arm 53 again to drive the valve plate 54 to move towards the inside of the discharge pipe 4 to seal the bottom end of the mixing cylinder 2.

[0109] In other embodiments, the blocking device 5 does not have a connecting arm 53, and the push cylinder 51 is installed on the storage box 52. The output end of the push cylinder 51 passes through the storage box 52 and is connected to the valve plate 54.

[0110] Among them, the push cylinder 51 can be an electric push rod, a pneumatic cylinder, or a hydraulic cylinder, etc.

[0111] As an optional embodiment, the driving device 62 includes a mounting bracket and a driving motor. The driving motor is mounted on the discharge pipe 4 through the mounting bracket, and the output shaft of the driving motor is connected to the rotating shaft 61. The driving motor drives the rotating shaft 61 to rotate, thereby realizing the flip filter structure 63.

[0112] Please see Figure 4 and Figure 7 As another optional embodiment, the driving device 62 is a first gear, which is mounted on the rotating shaft 61 and located outside the main tube 41;

[0113] The equipment for recovering lithium from roasting-sulfurization tailings also includes a driving device 8, which includes a driving frame 81 and a first tooth set 82. The driving frame 81 is mounted on the connecting arm 53, and the first tooth set 82 is mounted on the top of the driving frame 81 and is aligned with the first gear.

[0114] In this example, when the pusher cylinder 51 drives the valve plate 54 to open via the connecting arm 53 (even when the mixing cylinder 2 is connected to the discharge pipe 4), the valve plate 54 is initially not fully opened, such as... Figure 8In the middle (d), the first tooth group 82 is not engaged with the driving device 8 (first gear). At this time, the solution is discharged through the drain pipe, and solid impurities are filtered onto the filter screen structure 63.

[0115] After the solution is drained, continue to fully open the valve plate 54. During the process of retracting the valve plate 54, the inner wall of the main pipe 41 can push out the impurities located on the valve plate 54, so as to avoid them remaining at the bottom of the valve plate 54.

[0116] At the same time, the first tooth group 82 drives the drive device 8 (first gear) to rotate, and the drive device 8 (first gear) drives the rotating shaft 61 to rotate, thereby driving the filter structure 63 to flip.

[0117] The sealing device 5 can be used to open or close the bottom outlet of the mixing cylinder 2, and can be used to control the flipping of the filter structure 63 during the process of opening the bottom outlet of the mixing cylinder 2.

[0118] When the first tooth group 82 is fully engaged with the drive device 62 (first gear), the drive device 62 (first gear) can drive the rotating shaft 61 to rotate 180 degrees, thereby driving the filter structure 63 to rotate 180 degrees.

[0119] As an alternative embodiment of this example, the rotating device 72 includes a rotating motor and a mounting bracket. The rotating motor is mounted on the discharge pipe 4 via the mounting bracket, and the output shaft of the rotating motor is connected to the drive shaft 71. The rotating motor drives the drive shaft 71 to rotate.

[0120] Please see Figure 4 As another optional embodiment, the rotating device 72 is a second gear. The rotating device 72 is mounted on the drive shaft 71 and located outside the main tube 41. The drive device 8 also includes a second tooth set 83, which is mounted on the bottom of the drive frame 81.

[0121] When the push cylinder 51 drives the valve plate 54 to open via the connecting arm 53, after the drive frame 81 drives the second tooth group 82 to fully interact with the rotating device 72, the first tooth group 83 interacts with the drive device 62.

[0122] In this embodiment, as Figure 8 In section (b), the guide plate 73 initially tilts and blocks the discharge pipe. As the push cylinder 51 drives the valve plate 54 to open via the connecting arm 53, it causes... Figure 8In the middle (d), the valve plate 54 is not fully open, and the second gear assembly 83 does not drive the rotating device 72 to rotate. After the solution is completely discharged through the drain pipe and solid impurities are filtered onto the filter screen structure 63, the valve plate 54 continues to open. At this time, the second gear assembly 83 drives the rotating device 72 (second gear) to rotate, causing the guide plate 73 to tilt and block the drain pipe. Figure 9 In (a), at this time the first tooth group 82 does not drive the drive device 62 (first gear) to rotate, that is, the filter screen does not flip.

[0123] As the valve plate 54 continues to open until it is fully inside the storage box 52, the first tooth assembly 82 and the drive device 62 (first gear) rotate, thereby causing the filter structure 63 to flip.

[0124] Thus, the sealing device 5 can connect the mixing cylinder 2 and the discharge pipe 4 in one state, and can also flip the filter structure 63. In this process, the guiding direction of the guide plate 73 can also be adjusted.

[0125] After the valve plate 54 is completely closed, the first tooth group 82 and the second tooth group 83 correspond to the driving device 62 (first gear) and the rotating device 72 (second gear), so that the filter screen structure 63 and the guide plate 73 are restored to the initial state.

[0126] As a preferred embodiment, the device for recovering lithium from roasting-sulfurization tailings further includes a locking structure 9, which includes a connecting frame 91 and a positioning shaft 92. The connecting frame 91 is mounted on the drive frame 81, one end of the positioning shaft 92 is horizontally mounted on the connecting frame 91, and the other end of the positioning shaft 92 passes through the rotating shaft 61.

[0127] By setting the locking structure 9, the axial position of the rotating shaft 61 can be limited, so that the filter structure 63 can work stably during filtration and will not deflect.

[0128] Among them, such as Figure 8 (a) and Figure 8 In (b), before the first tooth set 82 meshes with the drive device 62 (first gear), the positioning shaft 92 is always inserted into the rotating shaft 61;

[0129] like Figure 9 In (b), before the first tooth set 82 and the drive device 62 (first gear) begin to work, the positioning shaft 92 follows the drive frame 81 and separates from the rotating shaft 61;

[0130] Since the rotating shaft 61 rotates 180 degrees, the positioning hole on the rotating shaft 61 will be aligned with the positioning shaft 92 again. Therefore, when the valve plate 54 is closed, the drive frame 81 can drive the positioning shaft 92 to be inserted into the rotating shaft 61 again to limit its position.

[0131] Preferably, the drive frame 81 is slidably connected to the outer wall of the discharge pipe 4, a slide rail is provided on the outer wall of the discharge pipe 4, and the drive frame 81 is opened with a slide groove on the side facing the discharge pipe 4, and is fitted on the slide rail to form a sliding connection.

[0132] A rubber sleeve is fitted on the surface of the rotating shaft 61, so that the filter structure 63 can remain horizontal and not rotate when it is not subjected to external force, thereby ensuring that the subsequent positioning shaft 92 is aligned and inserted with the positioning hole on the rotating shaft 61.

[0133] As another optional method in this embodiment, a U-shaped support frame can also be set. One end of the U-shaped support rod passes through the discharge pipe 4 and supports both sides of the filter structure 63. When it is necessary to flip the filter structure 63, the U-shaped support rod is pulled outward to separate it from the filter structure 63. The pulling out of the U-shaped support rod can be done by an electric push rod or manually.

[0134] Please see Figure 4 In a preferred embodiment, the end of the positioning shaft 92 facing the rotating shaft 61 is set to be tapered.

[0135] By setting the positioning shaft 92 to be tapered, even if the rotating shaft 61 deflects slightly, the rotating shaft 61 can still be inserted into the positioning hole on the rotating shaft 61, and the deflection angle of the rotating shaft 61 can be corrected by the action of the arc surface of the tapered head of the positioning shaft 92 and the inner wall of the positioning hole.

[0136] The working principle of the equipment for recovering lithium from roasting-sulfidation tailings provided by this invention is as follows:

[0137] The equipment proposed in this embodiment for recovering lithium from roasting-sulfurization tailings is mainly used for the lithium leaching reaction in step S3 and the solid-liquid separation in step S4.

[0138] Specifically, the calcined mixture is placed in the mixing drum 2, and then 5% sodium sulfide solution is added to react with the mixture for 10 minutes. During the reaction, the stirring device 3 stirs the mixture solution, and then 10% lime milk is added to react for 20 minutes.

[0139] After the reaction is complete, the sealing device 5 opens the bottom outlet of the mixing cylinder 2. After the reaction material passes through the filter screen structure 63, the lithium-containing solution is discharged into the preset container through the discharge pipe 4, and solid materials such as Tl2S precipitate are filtered by the filter screen structure 63.

[0140] After the lithium-containing solution is completely discharged, the drive device 62 rotates the shaft 61, which in turn causes the filter structure 63 to flip, allowing the material on the filter structure 63 to be discharged through the discharge pipe 4 into a pre-set container.

[0141] In this process, the drive device 62 drives the filter structure 63 to rotate 90 degrees via the rotating shaft 61 and holds it for a period of time so that the material can be discharged quickly first. Then, the filter structure 63 is flipped 180 degrees so that the material can be completely discharged.

[0142] Furthermore, clean water can be added to the mixing cylinder 2 to backwash the filter structure 63, which can wash away any residual or embedded impurities on the filter structure 63 and extend the service life of the filter.

[0143] The guide structure 7 is used to guide the solution to the drain pipe and the solid impurities to the discharge pipe, so that the solution and solid impurities can be discharged separately, avoiding the solid impurities remaining on the pipe when discharged through the same pipe. When the solution flows out, it carries away the solid impurities, leaving solid impurities in the solution.

[0144] Furthermore, while guiding the flow, the guide plate 73 also blocks the branch pipe 42 it is located in. That is, when discharging solid impurities, the guide plate 73 is tilted and positioned in the drain pipe, blocking the drain pipe; when discharging the solution, the guide plate 73 is tilted and positioned in the discharge pipe, blocking the discharge pipe.

[0145] Specifically, such as Figure 8 In section (b), the guide plate 73 initially tilts and blocks the discharge pipe. As the push cylinder 51 drives the valve plate 54 to open via the connecting arm 53, it causes... Figure 8 In the middle (d), the valve plate 54 is not fully open, and the second gear assembly 83 does not drive the rotating device 72 to rotate. After the solution is completely discharged through the drain pipe and solid impurities are filtered onto the filter screen structure 63, the valve plate 54 continues to open. At this time, the second gear assembly 83 drives the rotating device 72 (second gear) to rotate, causing the guide plate 73 to tilt and block the drain pipe. Figure 9 In (a), at this time the first tooth group 82 does not drive the drive device 62 (first gear) to rotate, that is, the filter screen does not flip.

[0146] As the valve plate 54 continues to open until it is fully inside the storage box 52, the first tooth assembly 82 and the drive device 62 (first gear) rotate, thereby causing the filter structure 63 to flip.

[0147] Thus, the sealing device 5 can connect the mixing cylinder 2 and the discharge pipe 4 in one state, and can also flip the filter structure 63. In this process, the guiding direction of the guide plate 73 can also be adjusted.

[0148] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for recovering lithium from tailings based on roasting-sulfidation, characterized in that, Includes the following steps: S1. Mixing: Grind and mix the ultrafine tailings with the auxiliary materials to obtain the mixture; S2. Calcination pretreatment: Place the mixture in a high-temperature furnace and calcine at 600~1000℃ for 0.5~2h. S3, Synergistic solidification of thallium and lithium leaching: The calcined mixture is leached at a solid-liquid ratio of 1:1 to 1:

5. During the leaching process, 5 to 20% sodium sulfide solution is added first and reacted for a preset time, followed by 10 to 30% lime milk and reacted for a preset time. S4. Solid-liquid separation: After the reaction of the mixture in step S3 is completed, a lithium-containing solution is obtained through solid-liquid separation.

2. The method for recovering lithium from tailings based on roasting-sulfidation according to claim 1, characterized in that, The excipients in S1 include one or more of sodium sulfate, calcium sulfate, calcium oxide, calcium carbonate, and sodium carbonate.

3. The method for recovering lithium from tailings based on roasting-sulfidation according to claim 1, characterized in that, In S3, the sodium sulfide solution is added before the lime slurry, and the reaction interval is 5-30 minutes.

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