A device and process for recovering valuable metals from lithium leaching residue

Abstract

This invention provides equipment and a process for recovering valuable metals from lithium leaching residue, relating to the field of solid waste treatment technology. The equipment includes an electrically movable frame, an electrically lifting frame, a first treatment tank, a second treatment tank, a drive mechanism, and an acid leaching mechanism. The electrically lifting frame has an electrically adjustable lifting plate installed externally, and the drive mechanism is located on the outer wall of the lifting plate. The drive mechanism includes a fixed plate fixedly installed on the outer wall of the lifting plate, and a first mounting plate and a second mounting plate are fixedly mounted on the outer wall of the fixed plate. This design can automatically switch the rotation direction of the rotating plate and adaptively switch it from a vertical to an inclined posture. It can adapt to the characteristics of low-solids-content fluids. Through adaptive posture adjustment throughout the entire process—from strong vertical mixing in the early stage to uniform inclined suspension in the later stage—it achieves matching of the entire acid leaching process, comprehensively improving the overall leaching efficiency of valuable metals, facilitating subsequent solid-liquid separation processes, and further optimizing the resource utilization of leaching residue and the harmless disposal of solid waste.

Description

Technical Field

[0001] This invention relates to the field of solid waste treatment, and more particularly to a device and process for recovering valuable metals from lithium leaching residue. Background Technology

[0002] Lithium leaching residue is the solid tailings waste residue remaining after solid-liquid separation of lithium-containing ores such as spodumene and lepidolite after roasting, acid leaching and water leaching for lithium extraction. It is also the most important bulk industrial solid waste in lithium salt production. Currently, the mainstream spodumene sulfuric acid process for lithium extraction produces a large amount of leaching residue, which is rich in alkali metals such as silicon, aluminum, lithium, sodium, potassium, rubidium, and cesium, and has huge potential for resource utilization.

[0003] The treatment of leaching residue is relatively simple. A large amount of leaching residue is piled up or simply landfilled, which not only occupies a lot of land resources, but may also pollute the soil and water. At the same time, the lithium contained in it is an important strategic resource that has not been fully recycled and utilized, resulting in resource waste.

[0004] In existing technologies, during the recycling process of spodumene leaching residue, the leaching residue is stirred and acid-leached with dilute sulfuric acid. The solid content in the leaching residue changes in the early and late stages of acid leaching, with the solid content in the early stage being greater than that in the later stage. Therefore, traditional acid leaching methods are prone to incomplete mixing in the early stage of acid leaching and affect the discharge in the later stage, which greatly affects the recovery and extraction of valuable metals.

[0005] Therefore, it is necessary to provide equipment and a recycling process for recovering valuable metals from lithium leaching residue to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides equipment and process for recovering valuable metals from lithium leaching residue, solving the problem in related technologies where the different solid content in the leaching residue before and after acid leaching affects the recovery quality.

[0007] To solve the above-mentioned technical problems, the present invention provides a device for recovering valuable metals from lithium leaching residue, comprising an electric moving frame, an electric lifting frame, a first processing tank, a second processing tank, a drive mechanism, and an acid leaching mechanism;

[0008] The electric lifting frame is equipped with an electrically adjustable lifting plate on its exterior, and the drive mechanism is located on the outer wall of the lifting plate.

[0009] The driving mechanism includes a fixed plate fixedly installed on the outer wall of the lifting plate. A first mounting plate and a second mounting plate are fixedly provided on the outer wall of the fixed plate. A motor is installed on the top of the first mounting plate. A drive rod is connected to the output shaft of the motor via a keyway. A first gear is connected to the bottom of the drive rod via a keyway. A rotating sleeve is rotatably connected inside the second mounting plate. A second gear is fixedly provided at the bottom of the rotating sleeve. A sleeve is fixedly provided at the bottom of the first mounting plate. A third gear is rotatably connected to the outer wall of the sleeve.

[0010] The acid leaching mechanism includes a connecting frame fixed to the outer wall of the rotating sleeve. A circular seat is fixed to the bottom end of the connecting frame. A sealing plate is sealed on the outer wall of the circular seat. A rotating rod is rotatably mounted at the center of the circular seat via a torsion spring. A rotating plate is fixed to the outer wall of the rotating rod. An arc-shaped groove is opened on the inner wall of the circular seat and inside the sealing plate. An arc-shaped slider is slidably mounted inside the arc-shaped groove. A connecting rod is fixed to the outer wall of the rotating rod and inside the sealing plate.

[0011] Preferably, the drive rod passes through the inside of the sleeve and does not contact the sleeve, and the sleeve passes through the inside of the rotating sleeve and does not contact the rotating sleeve.

[0012] Preferably, the first and second treatment tanks are connected by a filter pump, and the outer wall of the rotating rod and the center of the sealing plate are rotatably installed.

[0013] Preferably, the top end of the connecting rod is fixedly connected to the outer wall of the arc-shaped slider, and the arc-shaped groove and the rotating rod are on the same axis.

[0014] Preferably, a tapered spiral frame, wider at the top and narrower at the bottom, is fixed to the bottom of the first gear, and the spiral frame is located inside the rotating plate.

[0015] Preferably, the upper and lower positions of the third gear mesh with the second gear and the first gear, respectively.

[0016] Preferably, it also includes an injection mechanism;

[0017] The injection mechanism includes a mounting frame fixed to the top of the second processing tank. An extrusion cylinder is installed inside the mounting frame. A discharge pipe and an inlet pipe are installed through the outer wall of the extrusion cylinder. A key rod is slidably installed inside the extrusion cylinder. A piston and a push plate are fixed at both ends of the key rod, respectively. A spring is sleeved on the outer wall of the key rod.

[0018] Preferably, the outlet of the discharge pipe extends into the interior of the second processing tank, the two ends of the spring are fixedly connected to the extrusion cylinder and the push plate, and the outer wall of the piston and the inner wall of the extrusion cylinder are tightly fitted together.

[0019] The process for recovering valuable metals from lithium leaching residue includes the following steps:

[0020] S1: Take the lithium leaching residue from the spodumene sulfuric acid method, grind and dry it, and perform two-stage countercurrent washing. After the reaction is completed, filter to obtain filter residue 1 and filtrate 1. Remove impurities from filtrate 1, concentrate it, and precipitate lithium to obtain valuable lithium products.

[0021] S2: The filter residue 1 obtained after washing with water is mixed with dilute sulfuric acid, filtered to obtain filtrate 2 and filter residue 2. Sodium hydroxide is added to filtrate 2 for extraction to extract rubidium-rich solution and cesium-rich solution.

[0022] The acid leaching of filter residue 1 needs to be carried out in the equipment for recovering valuable metals from lithium leaching residue as described in claims 1-8, wherein filter residue 1 and dilute sulfuric acid are carried out in the first treatment tank, and filtrate 2 is carried out in the second treatment tank;

[0023] S3: Dry and grind the filter residue 2 obtained in S2, and press it into a blank;

[0024] S4: The preform is heated to react and then naturally cooled to prepare porous ceramics.

[0025] Compared with related technologies, the equipment and process for recovering valuable metals from lithium leaching residue provided by this invention have the following advantages:

[0026] For conditions where the solid content decreases and the material system becomes thinner in the later stages of acid leaching, the rotation direction of the rotating plate can be automatically switched, and the plate can be adaptively switched from a vertical posture to an inclined posture. This adapts to the characteristics of fluids with low solid content, optimizes the internal flow field distribution, avoids ineffective dredging and extra energy consumption, and achieves full-process adaptive posture adjustment through strong vertical mixing in the early stage and uniform suspension in the later stage. This improves the overall leaching efficiency of valuable metals, facilitates subsequent solid-liquid separation processes, and further optimizes the resource utilization of leaching residue and the harmless disposal of solid waste. Attached Figure Description

[0027] 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.

[0028] Figure 1 The optimal structural schematic diagram provided for this invention;

[0029] Figure 2 for Figure 1 The diagram shows the structure of the drive mechanism.

[0030] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the drive mechanism.

[0031] Figure 4 for Figure 3 The enlarged structural diagram at point A is shown below;

[0032] Figure 5 for Figure 2 The diagram shows the working state of the drive mechanism controlling the rotation of the acid leaching mechanism.

[0033] Figure 6 for Figure 5 The enlarged structural diagram at point B is shown below;

[0034] Figure 7 for Figure 1 The diagram shows the back structure.

[0035] Figure 8 for Figure 7 The diagram shows a cross-sectional view of the injection mechanism.

[0036] Explanation of icon numbers:

[0037] 1. Electric mobile frame; 2. Electric lifting frame;

[0038] 3. Lifting plate;

[0039] 4. First processing tank; 5. Second processing tank;

[0040] 6. Drive mechanism; 61. Fixed plate; 62. First mounting plate; 63. Second mounting plate; 64. Motor; 65. Drive rod; 66. First gear; 67. Rotating sleeve; 68. Second gear; 69. Sleeve; 610. Third gear.

[0041] 7. Acid leaching mechanism; 71. Connecting frame; 72. Spiral frame;

[0042] 73. Circular seat; 74. Rotating rod; 75. Rotating plate; 76. Arc groove; 77. Connecting rod; 78. Arc slider; 79. Sealing plate.

[0043] 8. Injection mechanism, 81. Mounting bracket, 82. Extrusion cylinder, 83. Discharge pipe, 84. Inlet pipe, 85. Key rod, 86. Push plate, 87. Spring, 88. Piston. 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 equipment and a process for recovering valuable metals from lithium leaching residue.

[0046] First embodiment:

[0047] Please see Figures 1 to 6 An apparatus for recovering valuable metals from lithium leaching residue includes an electric moving frame 1, an electric lifting frame 2, a first processing tank 4, a second processing tank 5, a drive mechanism 6, and an acid leaching mechanism 7.

[0048] The electric lifting frame 2 is externally equipped with an electrically adjustable lifting plate 3, and the drive mechanism 6 is located on the outer wall of the lifting plate 3.

[0049] The drive mechanism 6 includes a fixed plate 61 fixedly installed on the outer wall of the lifting plate 3. A first mounting plate 62 and a second mounting plate 63 are fixedly provided on the outer wall of the fixed plate 61. A motor 64 is installed on the top of the first mounting plate 62. A drive rod 65 is connected to the output shaft of the motor 64 via a keyway. A first gear 66 is connected to the bottom of the drive rod 65 via a keyway. A rotating sleeve 67 is rotatably connected inside the second mounting plate 63. A second gear 68 is fixedly provided at the bottom of the rotating sleeve 67. A sleeve 69 is fixedly provided at the bottom of the first mounting plate 62. A third gear 610 is rotatably connected to the outer wall of the sleeve 69.

[0050] The acid leaching mechanism 7 includes a connecting frame 71 fixed to the outer wall of the rotating sleeve 67. A circular seat 73 is fixed to the bottom end of the connecting frame 71. A sealing plate 79 is sealed on the outer wall of the circular seat 73. A rotating rod 74 is rotatably mounted at the center of the circular seat 73 via a torsion spring. A rotating plate 75 is fixed to the outer wall of the rotating rod 74. An arc-shaped groove 76 is opened on the inner wall of the circular seat 73 and inside the sealing plate 79. An arc-shaped slider 78 is slidably mounted inside the arc-shaped groove 76. A connecting rod 77 is fixed to the outer wall of the rotating rod 74 and inside the sealing plate 79.

[0051] The drive rod 65 passes through the inside of the sleeve 69 and does not contact the sleeve 69. The sleeve 69 passes through the inside of the rotating sleeve 67 and does not contact the rotating sleeve 67.

[0052] The first processing tank 4 and the second processing tank 5 are connected by a filter pump, and the outer wall of the rotating rod 74 and the center of the sealing plate 79 are rotatably installed.

[0053] The top end of the connecting rod 77 is fixedly connected to the outer wall of the arc-shaped slider 78, and the arc-shaped groove 76 and the rotating rod 74 are on the same axis.

[0054] Please see Figures 2 to 4The user starts the motor 64 and controls the drive rod 65 to drive the first gear 66 to rotate. When the first gear 66 rotates, it meshes with the third gear 610 to rotate. During the rotation of the third gear 610, it meshes with the second gear 68 above to rotate.

[0055] If the first gear 66 rotates counterclockwise, the second gear 68 is controlled to rotate clockwise by the third gear 610;

[0056] If the first gear 66 rotates clockwise, the second gear 68 is controlled to rotate counterclockwise via the third gear 610;

[0057] Therefore, the user can freely control the drive mechanism 6 and the acid leaching mechanism 7 to rotate clockwise or counterclockwise according to the specific working conditions inside the first processing tank 4.

[0058] It is understandable that since the drive rod 65 passes through the sleeve 69, the rotation of the drive rod 65 clockwise or counterclockwise will not affect the sleeve 69 in the fixed state. Secondly, the sleeve 69 passes through the rotating sleeve 67, so the rotation of the rotating sleeve 67 clockwise or counterclockwise will not affect the sleeve 69 in the fixed state.

[0059] Please see Figure 1 First, the leaching residue needs to be mixed with dilute sulfuric acid in the first treatment tank 4. The electric lifting frame 2 controls the lifting plate 3 to lift the drive mechanism 6 and the acid leaching mechanism 7 to the highest position. Then, the electric moving frame 1 drives the electric lifting frame 2 to move the drive mechanism 6 and the acid leaching mechanism 7 to the top of the first treatment tank 4. Finally, the lifting plate 3 lowers the acid leaching mechanism 7 to enter the first treatment tank 4 to mix and leach the leaching residue and dilute sulfuric acid.

[0060] After leaching, the solution is filtered by a filter pump and transported to the second processing tank 5. After filtration, filtrate 2 and filter residue 2 are obtained. Filtrate 2 is transported to the second processing tank 5 for extraction to extract rubidium-rich solution and cesium-rich solution, which can be used to prepare valuable rubidium and cesium products.

[0061] Please see Figure 5 and Figure 6 During the later stage of mixing, the user needs to control the rotating sleeve 67 to drive the connecting frame 71 to rotate clockwise. The circular seat 73 is affected by the connecting frame 71 and rotates clockwise. During the rotation, the force-bearing surface of the rotating plate 75 will be affected by the resistance inside the tank. Therefore, the rotating plate 75 can be pushed to rotate clockwise in the circular seat 73 through the rotating rod 74. During the rotation, the rotating rod 74 drives the arc-shaped slider 78 to rotate clockwise in the arc-shaped groove 76 through the connecting rod 77. At this time, the rotating plate 75 switches from the vertical state to the inclined state.

[0062] If, during the initial mixing stage, the user needs to control the rotating sleeve 67 to drive the rotating plate 75 to rotate counterclockwise, when the rotating plate 75 rotates counterclockwise, the force-bearing surface of the rotating plate 75 will be on the right side of the rotating plate 75. At this time, due to the obstruction on the left side of the arc groove 76, the rotating plate 75 will remain vertical no matter how much resistance it encounters.

[0063] Understandably: Since the rotating rod 74 and the circular seat 73 are mounted by a torsion spring, the rotating plate 75 will automatically return to its initial state if there is no force on either side during the flipping process.

[0064] In one application, the equipment for recovering valuable metals from lithium leaching residue can be used to recover lithium from spodumene filter residue.

[0065] When extracting lithium from spodumene filter residue, the spodumene filter residue is mixed and acid-leached in the first treatment tank 4, and the specific acid leaching steps are as described above.

[0066] In another application, the equipment for recovering valuable metals from lithium leaching residue can also be used for acid leaching of waste spodumene scrap to extract lithium.

[0067] This embodiment:

[0068] In the early stage of acid leaching, the leaching residue has a high solid content and the particles are prone to forming agglomerated layers. Conventional stirring can easily create dead zones. By using a vertical rotating plate to rotate 75 degrees, the agglomerated structure of the residue can be continuously broken up, allowing the dilute sulfuric acid and the leaching residue particles to fully disperse and contact, effectively increasing the solid-liquid contact surface area, eliminating mixing blind zones, accelerating the dissolution rate of valuable metal ions, and improving leaching efficiency.

[0069] Large amounts of solids in the early stages can easily cause stratification of concentrations in the upper and lower parts of the system, local accumulation of acid, and sedimentation of slag at the bottom. Vertical rotational mixing can achieve vertical circulation disturbance, so that the leaching residue powder and dilute sulfuric acid are uniformly mixed as a whole, the acid concentration distribution of the system is balanced, and the problem of incomplete leaching caused by local over-acidity or local under-acidity is prevented.

[0070] For the conditions of reduced solid content and thin material system in the later stage of acid leaching, the rotation direction of the rotating plate 75 can be automatically switched, and the rotating plate 75 can be adaptively switched from vertical posture to inclined posture. It can adapt to the characteristics of low solid content fluid, optimize the internal flow field distribution, avoid ineffective dredging and extra energy consumption. Through the adaptive posture adjustment of vertical strong mixing in the early stage and inclined uniform suspension in the later stage, the working conditions of the entire acid leaching process are matched, the overall leaching efficiency of valuable metals is improved, and the subsequent solid-liquid separation process is facilitated, further optimizing the resource utilization of leaching residue and the harmless treatment of solid waste.

[0071] This method maximizes the leaching and recovery of valuable components remaining in the leaching residue, allows for more thorough extraction of usable resources from the waste residue, and ultimately significantly reduces the amount of tailings discharged, thereby reducing the total amount of solid waste stockpiled at the source and saving land resources for solid waste landfill and stockpiling.

[0072] Second embodiment:

[0073] Please see Figures 5 to 6 The bottom of the first gear 66 is fixed with a tapered spiral frame 72 that is wider at the top and narrower at the bottom, and the spiral frame 72 is located inside the rotating plate 75.

[0074] The third gear 610 is positioned vertically to mesh with the second gear 68 and the first gear 66, respectively.

[0075] Please see Figure 5 and Figure 6 In the first embodiment, during the initial stirring stage, the rotating plate 75 rotates counterclockwise, and the screw frame 72 rotates clockwise. At this time, the clockwise rotation of the screw frame 72 will generate an upward diffusion force, causing the leaching residue at the bottom of the first treatment tank 4 to surge into the upper environment.

[0076] As the acid leaching and stirring process progresses into the later stages, the rotating plate 75 rotates clockwise, and the screw frame 72 rotates clockwise simultaneously. During the clockwise rotation, a downward vortex is formed, which can be coordinated with the bottom discharge of the first treatment tank 4 to ensure smoother and more stable discharge of the first treatment tank 4.

[0077] This embodiment:

[0078] The spiral frame 72 rotates synchronously with the rotating plate 75. When rotating clockwise, it can form an all-round three-dimensional circulation that combines axial upward movement with radial diffusion in the first treatment tank 4. Combined with the shearing and dispersing effect of the rotating plate 75, it can achieve uniform mixing of materials throughout the tank, so that the dilute sulfuric acid and leaching residue particles can be fully contacted in all directions.

[0079] Secondly, when the screw frame 72 rotates counterclockwise, it will form a vortex spiraling towards the bottom of the first processing tank 4. Combined with the rotating plate 75 switching the tilt posture, it can assist the discharge of the first processing tank 4, making it easier for the first processing tank 4 to be conveyed into the second processing tank 5.

[0080] Third embodiment:

[0081] Please see Figures 7 to 8 It also includes the injection mechanism 8;

[0082] The injection mechanism 8 includes a mounting bracket 81 fixed to the top of the second processing tank 5. An extrusion cylinder 82 is installed inside the mounting bracket 81. A discharge pipe 83 and an inlet pipe 84 are installed through the outer wall of the extrusion cylinder 82. A key rod 85 is slidably installed inside the extrusion cylinder 82. A piston 88 and a push plate 86 are fixed at both ends of the key rod 85, respectively. A spring 87 is sleeved on the outer wall of the key rod 85.

[0083] The outlet of the discharge pipe 83 extends into the interior of the second processing tank 5. The two ends of the spring 87 are fixedly connected to the extrusion cylinder 82 and the push plate 86. The outer wall of the piston 88 and the inner wall of the extrusion cylinder 82 are tightly fitted together.

[0084] Please see Figure 7 and Figure 8 When working inside the second processing tank 5, the user also moves the lifting plate 3 above the second processing tank 5. During the movement of the lifting plate 3, the back of the lifting plate 3 will push the push plate 86 to drive the key rod 85 to control the piston 88 to move inside the extrusion cylinder 82. During the movement of the piston 88, it will push the sodium hydroxide solution inside the extrusion cylinder 82 to be injected into the second processing tank 5 through the discharge pipe 83.

[0085] Understandably, the user sets a one-way valve between the discharge pipe 83 and the extrusion cylinder 82, allowing only one-way flow from the inside of the extrusion cylinder 82 to the outside, and a one-way valve between the inlet pipe 84 and the extrusion cylinder 82, allowing only one-way flow from the inlet pipe 84 to the inside of the extrusion cylinder 82. This way, backflow will not occur when the piston 88 reciprocates. Secondly, the user can install a sodium hydroxide storage tank outside the inlet pipe 84 to ensure that the sodium hydroxide solution can be continuously injected into the second treatment tank 5.

[0086] This embodiment:

[0087] By precisely injecting sodium hydroxide solution, residual acid in the acid leaching system can be accurately neutralized, the pH value of the slurry can be stably controlled, the reaction conditions can be controlled, and the soluble ions in the waste residue can be solidified and stabilized, reducing the leaching toxicity of the tailings and the risk of leachate pollution. This achieves harmless and stable disposal of solid waste. The quantitative injection method can effectively avoid excessive consumption of acid and alkali agents, reduce the generation of secondary salts and waste liquid, reduce the load on subsequent wastewater treatment, facilitate the orderly recovery and separation of valuable metals, improve the level of solid waste resource utilization, and achieve synergy between clean production and ecological environmental protection.

[0088] The process for recovering valuable metals from lithium leaching residue includes the following steps:

[0089] S1: Take the lithium leaching residue from the spodumene sulfuric acid method, grind it to a certain degree, dry it at a certain temperature until the water content reaches a certain standard, and perform two-stage countercurrent washing at a certain temperature according to a certain solid-liquid ratio, with each stage staying for a certain time. After the reaction is completed, filter to obtain filter residue 1 and filtrate 1. Remove impurities from filtrate 1, concentrate it, and precipitate lithium to obtain valuable lithium products.

[0090] S2: The filter residue 1 obtained after washing with water is mixed with dilute sulfuric acid in a certain proportion, stirred at a certain temperature for a period of time, and filtered to obtain filtrate 2 and filter residue 2. A certain amount of sodium hydroxide is added to filtrate 2 to adjust the pH to a certain range, and then extraction is performed to extract rubidium-rich solution and cesium-rich solution, which can be used to prepare valuable rubidium products and cesium products.

[0091] The acid leaching of filter residue 1 needs to be carried out in the lithium leaching residue recovery equipment, wherein filter residue 1 and dilute sulfuric acid are processed in the first treatment tank 4, and filtrate 2 is processed in the second treatment tank 5.

[0092] S3: Dry and grind the filter residue 2 obtained in S2, and then mix it with feldspar powder, silicon carbide and PAM in a certain proportion. After mixing, ball mill it for a period of time, and press the material into a blank under a certain pressure.

[0093] S4: The preform is reacted at a certain temperature for a period of time, then heated to a certain temperature and held for a period of time, and finally cooled naturally to prepare porous ceramics. During the sintering process, high-value metal elements such as rubidium and cesium in the flue gas can be recovered by spraying a certain concentration of dilute sulfuric acid on the tail gas.

[0094] Please refer to the reference again. Figures 1 to 8 The working principle of the equipment and recycling process for recovering valuable metals from lithium leaching residue provided by this invention is as follows:

[0095] Step S1: First, the leaching residue needs to be mixed with dilute sulfuric acid in the first treatment tank 4. The electric lifting frame 2 controls the lifting plate 3 to lift the drive mechanism 6 and the acid leaching mechanism 7 to the highest position. Then, the electric moving frame 1 drives the electric lifting frame 2 to move the drive mechanism 6 and the acid leaching mechanism 7 to the top of the first treatment tank 4. Finally, the lifting plate 3 lowers the acid leaching mechanism 7 to enter the first treatment tank 4 to mix and leach the leaching residue and dilute sulfuric acid.

[0096] After leaching, the solution is filtered by a filter pump and transported to the second processing tank 5. After filtration, filtrate 2 and filter residue 2 are obtained. Filtrate 2 is transported to the second processing tank 5 for extraction to extract rubidium-rich solution and cesium-rich solution, which can be used to prepare valuable rubidium and cesium products.

[0097] In step S2, during the later stage of mixing, the user needs to control the rotating sleeve 67 to drive the connecting frame 71 to rotate clockwise. The circular seat 73 is affected by the connecting frame 71 and rotates clockwise. During the rotation, the force-bearing surface of the rotating plate 75 will be affected by the resistance inside the tank. Therefore, the rotating plate 75 can be pushed to rotate clockwise in the circular seat 73 through the rotating rod 74. During the rotation, the rotating rod 74 drives the arc-shaped slider 78 to rotate clockwise in the arc-shaped groove 76 through the connecting rod 77. At this time, the rotating plate 75 switches from the vertical state to the inclined state.

[0098] If, in the early stage of mixing, the user needs to control the rotating sleeve 67 to drive the rotating plate 75 to rotate counterclockwise, when the rotating plate 75 rotates counterclockwise, the force-bearing surface of the rotating plate 75 will be on the right side of the rotating plate 75. At this time, due to the obstruction on the left side of the arc groove 76, the rotating plate 75 will remain vertical no matter how much resistance it encounters.

[0099] In the early stage of stirring, the rotating plate 75 rotates counterclockwise, and the screw frame 72 will rotate clockwise. At this time, the clockwise rotation of the screw frame 72 will generate an upward diffusion force, which will cause the leaching residue at the bottom of the first treatment tank 4 to surge into the upper environment.

[0100] As the acid leaching and stirring process progresses into the later stages, the rotating plate 75 rotates clockwise, and the screw frame 72 rotates clockwise simultaneously. During the clockwise rotation, a downward vortex is formed, which can be coordinated with the bottom discharge of the first treatment tank 4 to ensure smoother and more stable discharge of the first treatment tank 4.

[0101] 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 device for recovering valuable metals from lithium leaching residue, characterized in that, It includes an electric moving frame, an electric lifting frame, a first treatment tank, a second treatment tank, a drive mechanism, and an acid leaching mechanism; The electric lifting frame is equipped with an electrically adjustable lifting plate on its exterior, and the drive mechanism is located on the outer wall of the lifting plate. The driving mechanism includes a fixed plate fixedly installed on the outer wall of the lifting plate. A first mounting plate and a second mounting plate are fixedly provided on the outer wall of the fixed plate. A motor is installed on the top of the first mounting plate. A drive rod is connected to the output shaft of the motor via a keyway. A first gear is connected to the bottom of the drive rod via a keyway. A rotating sleeve is rotatably connected inside the second mounting plate. A second gear is fixedly provided at the bottom of the rotating sleeve. A sleeve is fixedly provided at the bottom of the first mounting plate. A third gear is rotatably connected to the outer wall of the sleeve. The acid leaching mechanism includes a connecting frame fixed to the outer wall of the rotating sleeve. A circular seat is fixed to the bottom end of the connecting frame. A sealing plate is sealed on the outer wall of the circular seat. A rotating rod is rotatably mounted at the center of the circular seat via a torsion spring. A rotating plate is fixed to the outer wall of the rotating rod. An arc-shaped groove is opened on the inner wall of the circular seat and inside the sealing plate. An arc-shaped slider is slidably mounted inside the arc-shaped groove. A connecting rod is fixed to the outer wall of the rotating rod and inside the sealing plate.

2. The equipment for recovering valuable metals from lithium leaching residue according to claim 1, characterized in that, The drive rod passes through the inside of the sleeve but does not contact the sleeve, and the sleeve passes through the inside of the rotating sleeve but does not contact the rotating sleeve.

3. The equipment for recovering valuable metals from lithium leaching residue according to claim 1, characterized in that, The first and second treatment tanks are connected by a filter pump, and the rotating rod is rotatably mounted on the outer wall and the center of the sealing plate.

4. The equipment for recovering valuable metals from lithium leaching residue according to claim 1, characterized in that, The top of the connecting rod is fixedly connected to the outer wall of the arc-shaped slider, and the arc-shaped groove and the rotating rod are on the same axis.

5. The equipment for recovering valuable metals from lithium leaching residue according to claim 1, characterized in that, The bottom of the first gear is fixed with a tapered spiral frame that is wider at the top and narrower at the bottom, and the spiral frame is located inside the rotating plate.

6. The equipment for recovering valuable metals from lithium leaching residue according to claim 5, characterized in that, The third gear is positioned vertically to mesh with the second gear and the first gear, respectively.

7. The equipment for recovering valuable metals from lithium leaching residue according to claim 1, characterized in that, It also includes an injection mechanism; The injection mechanism includes a mounting frame fixed to the top of the second processing tank. An extrusion cylinder is installed inside the mounting frame. A discharge pipe and an inlet pipe are installed through the outer wall of the extrusion cylinder. A key rod is slidably installed inside the extrusion cylinder. A piston and a push plate are fixed at both ends of the key rod, respectively. A spring is sleeved on the outer wall of the key rod.

8. The equipment for recovering valuable metals from lithium leaching residue according to claim 7, characterized in that, The outlet of the discharge pipe extends into the interior of the second processing tank. The two ends of the spring are fixedly connected to the extrusion cylinder and the push plate. The outer wall of the piston and the inner wall of the extrusion cylinder are tightly fitted together.

9. A process for recovering valuable metals from lithium leaching residue, characterized in that, Includes the following steps: S1: Take the lithium leaching residue from the spodumene sulfuric acid method, grind and dry it, and perform two-stage countercurrent washing. After the reaction is completed, filter to obtain filter residue 1 and filtrate 1. Remove impurities from filtrate 1, concentrate it, and precipitate lithium to obtain valuable lithium products. S2: The filter residue 1 obtained after washing with water is mixed with dilute sulfuric acid, filtered to obtain filtrate 2 and filter residue 2. Sodium hydroxide is added to filtrate 2 for extraction to extract rubidium-rich solution and cesium-rich solution. The acid leaching of filter residue 1 needs to be carried out in the equipment for recovering valuable metals from lithium leaching residue as described in claims 1-8, wherein filter residue 1 and dilute sulfuric acid are carried out in the first treatment tank, and filtrate 2 is carried out in the second treatment tank; S3: Dry and grind the filter residue 2 obtained in S2, and press it into a blank; S4: The preform is heated to react and then naturally cooled to prepare porous ceramics.

Images