Equipment for extracting metal from spodumene impurity removal slag and recovery process thereof

Abstract

The invention provides equipment for extracting metal from spodumene impurity removal slag and a recovery process of the equipment, and relates to the technical field of solid waste treatment. The discharging mechanism comprises a mounting frame mounted on the outer wall of the extraction box, a discharging motor is mounted on the side wall of the mounting frame through bolts, and a discharging lead screw is connected to an output shaft key groove of the discharging motor. According to the scheme, a concentrated solution can be uniformly dispersed into an alkali liquor system through the spray pipes capable of being adjusted at equal intervals, the discharge amount of each spray pipe is consistent, the uniform coverage range is ensured through the equal-interval design, the concentrated solution and the alkali liquor slowly and uniformly react, local supersaturation degree mutation is avoided, and orderly proceeding of impurity precipitation and lithium carbonate crystallization is ensured; and secondly, the mixing uniformity of a reaction system can be improved, the mass transfer efficiency can be enhanced, the top space of the extraction box can be covered by the design of equidistant distribution, and a concentrated solution can be quickly fused with an alkali solution in cooperation with a stirring mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of solid waste treatment and utilization, and particularly relates to a device for extracting metal from impurity removal residue of spodumene and a recovery process thereof. BACKGROUND

[0002] In the process of spodumene lithium extraction, the treatment of impurity removal residue generated in the process of brine purification by impurity removal filtration has always been a problem, and the recovery technology of valuable metals in the impurity removal residue generated in the process of primary impurity removal filtration has attracted much attention.

[0003] The treatment method of the waste residue generated in the process of spodumene lithium extraction is relatively simple and extensive, and most of the waste residue is stacked and stored, which not only occupies a large amount of land resources, but also may pollute the soil and surface water. Some recovery processes only focus on the recovery of lithium elements and ignore the comprehensive utilization of other associated elements, resulting in resource waste.

[0004] In the prior art, when the concentrated solution is added to the alkali solution in the process of spodumene recovery and utilization, local reaction imbalance is easily caused, which may cause impurity entrainment and lithium loss, and the mixing uniformity of the reaction system is poor and the mass transfer efficiency is low.

[0005] Therefore, it is necessary to provide a device for extracting metal from impurity removal residue of spodumene and a recovery process thereof to solve the above technical problems. SUMMARY

[0006] The present application provides a device for extracting metal from impurity removal residue of spodumene and a recovery process thereof, which solves the problem of local reaction imbalance caused by adding concentrated solution to alkali solution in the related art, which may cause impurity entrainment and lithium loss.

[0007] To solve the above technical problems, the present application provides a device for extracting metal from impurity removal residue of spodumene, which comprises an extraction box and a discharging mechanism.

[0008] The discharging mechanism comprises a mounting frame mounted on the outer wall of the extraction box, a discharging motor is mounted on the side wall of the mounting frame through bolts, a discharging lead screw is connected to the output shaft key groove of the discharging motor, first, second, third and fourth sliding blocks are threadedly connected to the outer wall of the discharging lead screw, a limiting groove is formed in the inside of the mounting frame, a moving plate is fixedly arranged on the top of each of the first, second, third and fourth sliding blocks, a spray pipe is mounted on the side wall of the moving plate, a spring pipe is mounted on the inlet end of the spray pipe, a hose is sealingly mounted on the side wall of the spring pipe, a first connecting plate is rotatably connected to the bottom of the mounting frame, a second connecting plate is rotatably connected to the bottom of the first sliding block, a third connecting plate is rotatably connected to the bottom of the second sliding block, a fourth connecting plate is rotatably connected to the bottom of the third sliding block, and a fifth connecting plate is rotatably connected to the bottom of the fourth sliding block.

[0009] Preferably, the second connecting plate is rotatably connected at both ends to the first connecting plate and the third connecting plate, and the fourth connecting plate is rotatably connected at both ends to the third connecting plate and the fifth connecting plate.

[0010] Preferably, the first connecting plate and the fifth connecting plate are equal in length, and the second connecting plate, the third connecting plate and the fourth connecting plate are equal in length.

[0011] Preferably, the moving plate is slidably connected with respect to the horizontal direction of the limiting groove, and both ends of the blanking lead screw are rotatably connected to the inside of the mounting frame through bearings.

[0012] Preferably, the reciprocating mechanism is further included.

[0013] A top plate is fixedly arranged at the middle position of the bottom of the extraction box, and a stirring mechanism is arranged inside the top plate. The stirring mechanism includes a stirring rod rotatably connected to the middle position of the top plate and located inside the extraction box. A gear is connected to the key groove at the top of the stirring rod.

[0014] The reciprocating mechanism includes a mounting plate arranged at the top of the extraction box and located at one side of the top plate. A reciprocating motor is arranged on the side wall of the mounting plate through bolts. A reciprocating lead screw is connected to the output shaft of the reciprocating motor through a key groove. A slide rod is fixedly arranged at the top of the mounting plate and located at one side of the reciprocating lead screw. A reciprocating plate is threadedly connected to the outside of the reciprocating lead screw. A reciprocating rack is arranged on one side of the reciprocating plate.

[0015] The reciprocating rack and the gear are in meshing relationship with each other. The reciprocating plate slides with respect to the horizontal direction of the slide rod. Both ends of the reciprocating lead screw are rotatably connected to the mounting plate.

[0016] Preferably, the stirring mechanism is further included.

[0017] A top frame is arranged on the upper surface of the top plate. A stirring motor is arranged at the top of the top frame. A key rod is connected to the output shaft of the stirring motor through a key groove. A sliding sleeve is slidably connected to the outer wall of the key rod. A positioning bolt is threadedly connected to the outer wall of the sliding sleeve.

[0018] The shaft of the gear and the bottom end of the key rod are connected through a key groove. The positioning bolt extends through the inside of the sliding sleeve and reaches the outer wall of the key rod. The sliding sleeve and the gear are fixedly connected.

[0019] Preferably, the overturning mechanism is further included.

[0020] The overturning mechanism is mirror-imaged arranged on both sides of the inside of the extraction box. A trigger plate is arranged on both sides of the reciprocating plate and away from one side of the reciprocating rack.

[0021] The flipping mechanism includes a mounting base fixedly installed on the inner wall of the extraction box. A flipping plate is rotatably installed inside the mounting base via a torsion spring. A trigger rod is installed above the flipping plate. A base plate is fixedly installed below the flipping plate. Middle plates are rotatably connected to both sides of the mounting base. Motion plates are fixedly installed on the outer walls of both middle plates. A connecting rod is fixedly installed on the opposite side of the two motion plates.

[0022] Preferably, the trigger rod and the trigger plate are in the same horizontal direction, and both middle plates are connected to the keyway at the middle position of the flip plate.

[0023] A process for recovering metals from spodumene impurity slag includes the following steps:

[0024] S1: Prepare a NaOH solution of appropriate concentration;

[0025] S2: The slag from the first impurity removal of spodumene is mixed with NaOH solution in a certain proportion and stirred at a certain temperature for a period of time. After the reaction is completed, leachate A and leaching residue A are obtained. Leaching residue A is washed for a certain period of time.

[0026] S3: The leachate obtained in step two is purified by passing it through an ion exchange resin at a certain flow rate to further remove calcium and magnesium impurities and obtain a qualified resin solution.

[0027] S4: The obtained qualified liquid is heated on an electric furnace to rapidly concentrate it and control the lithium content within a certain range;

[0028] S5: Prepare an alkaline solution for lithium precipitation reaction according to a certain ratio, and heat the concentrated solution and alkaline solution from step four to a certain temperature in a water bath respectively.

[0029] S6: Slowly add the concentrate to the alkali solution at a certain flow rate, stir continuously for a period of time, and filter to separate. In this step, the alkali solution and concentrate need to be stirred and mixed in the extraction tank during the operation.

[0030] S7: Take the filter residue from step six, add water in a certain proportion, wash it, and dry it at a certain temperature to obtain battery-grade lithium carbonate.

[0031] S8: Prepare magnesium chloride solution in a certain proportion, mix the leaching residue from step two in a certain solid-liquid ratio, stir at a certain temperature for a period of time to carry out a metathesis reaction, and after the reaction is completed, obtain leaching solution B and leaching residue B. Leaching residue B is washed with water and dried for a period of time.

[0032] S9: Add a certain concentration of concentrated hydrogen chloride solution to filtrate B to adjust the pH and react for a period of time to remove the influence of possible carbonate ions. Evaporate and crystallize to obtain calcium chloride.

[0033] S10: Wash the filter residue B from step eight with water several times, and stir it at a certain temperature for a period of time to obtain magnesium hydroxide.

[0034] Compared with related technologies, the equipment and recycling process for extracting metals from spodumene impurity slag provided by this invention have the following advantages:

[0035] The concentrated solution can be evenly dispersed into the alkaline solution system through the equidistantly adjustable nozzles. The output of each nozzle is consistent. The equidistant design ensures uniform coverage, allowing the concentrated solution and alkaline solution to react slowly and evenly, avoiding sudden changes in local supersaturation, ensuring that impurity precipitation and lithium carbonate crystallization proceed in an orderly manner, and reducing the adsorption and loss of valuable substances and the entrainment of impurities.

[0036] Secondly, it can improve the mixing uniformity of the reaction system and enhance the mass transfer efficiency. The equidistant distribution design can cover the top space of the extraction box. Combined with the stirring mechanism, it can quickly blend the concentrate with the alkali solution, break the local concentration gradient caused by a single addition port, and form a uniform reaction environment. Uniform mixing can accelerate the lithium mass transfer rate, avoid incomplete reaction due to insufficient local lithium, and at the same time make the lithium carbonate crystal growth more uniform, resulting in higher efficiency in subsequent filtration and washing.

[0037] Furthermore, the first, second, third, and fourth sliders move at equal intervals throughout their movement. This design allows for adaptive adjustment to accommodate concentrates of varying concentrations. When the concentrate concentration is high, the movement range can be maximized, while when the concentrate concentration is low, the spacing between injections can be reduced. Attached Figure Description

[0038] 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.

[0039] Figure 1 The optimal structural schematic diagram provided for this invention;

[0040] Figure 2 for Figure 1 The diagram shows a side view of the structure.

[0041] Figure 3 This is a schematic cross-sectional view of the extraction box shown in this invention;

[0042] Figure 4 This is a schematic diagram of the initial working state of the feeding mechanism provided by the present invention;

[0043] Figure 5 forFigure 4 The diagram shows the top structure of the feeding mechanism;

[0044] Figure 6 This is a schematic diagram of the rotating working state of the feeding mechanism provided by the present invention;

[0045] Figure 7 for Figure 6 The diagram shows the top structure of the feeding mechanism during its rotational operation.

[0046] Figure 8 This is a schematic diagram of the reciprocating mechanism and stirring mechanism provided by the present invention;

[0047] Figure 9 for Figure 8 The enlarged structural diagram at point A is shown below;

[0048] Figure 10 for Figure 8 The diagram shows a detailed structural schematic of the stirring mechanism.

[0049] Figure 11 This is a schematic diagram of the initial working state of the flipping mechanism provided by the present invention;

[0050] Figure 12 for Figure 11 The diagram shown illustrates the working state of the reciprocating mechanism driving the tilting mechanism during operation.

[0051] Figure 13 This is a schematic diagram of the process flow for recovering metals from spodumene impurity slag provided by the present invention.

[0052] Explanation of icon numbers:

[0053] 1. Extraction box;

[0054] 2. Feeding mechanism; 21. Mounting frame; 22. Feeding motor; 23. Feeding screw; 24. Limiting groove; 25. First slider; 26. Second slider; 27. Third slider; 28. Fourth slider; 29. ​​First connecting plate; 210. Second connecting plate; 211. Third connecting plate; 212. Fourth connecting plate; 213. Fifth connecting plate; 214. Moving plate; 215. Nozzle; 216. Spring tube; 217. Hose.

[0055] 3. Reciprocating mechanism; 31. Mounting plate; 32. Reciprocating motor; 33. Reciprocating lead screw; 34. Slide rod; 35. Reciprocating plate; 36. Reciprocating rack; 37. Trigger plate.

[0056] 4. Top slab;

[0057] 5. Stirring mechanism; 51. Stirring rod; 52. Gear; 53. Top frame; 54. Stirring motor; 55. Key rod; 56. Sliding sleeve; 57. Positioning bolt.

[0058] 6. Flipping mechanism; 61. Mounting base; 62. Flipping plate; 63. Trigger rod; 64. Base plate; 65. Middle plate; 66. Moving plate; 67. Connecting rod. Detailed Implementation

[0059] 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.

[0060] This invention provides a device and a recycling process for extracting metals from spodumene impurity slag.

[0061] First embodiment:

[0062] Please see Figures 1 to 7 An apparatus for extracting metals from spodumene slag, comprising an extraction box 1 and a feeding mechanism 2;

[0063] The feeding mechanism 2 includes a mounting frame 21 installed on the outer wall of the extraction box 1. A feeding motor 22 is bolted to the side wall of the mounting frame 21. The output shaft of the feeding motor 22 is keyway connected to a feeding screw 23. A first slider 25, a second slider 26, a third slider 27, and a fourth slider 28 are threaded onto the outer wall of the feeding screw 23. A limit groove 24 is provided inside the mounting frame 21. A movable plate 21 is fixed to the top of each of the first slider 25, the second slider 26, the third slider 27, and the fourth slider 28. 4. A nozzle 215 is installed on the side wall of the movable plate 214. A spring tube 216 is installed at the inlet end of the nozzle 215. A flexible hose 217 is sealed on the side wall of the spring tube 216. A first connecting plate 29 is rotatably connected to the bottom of the mounting bracket 21. A second connecting plate 210 is rotatably connected to the bottom of the first slider 25. A third connecting plate 211 is rotatably connected to the bottom of the second slider 26. A fourth connecting plate 212 is rotatably connected to the bottom of the third slider 27. A fifth connecting plate 213 is rotatably connected to the bottom of the fourth slider 28.

[0064] The two ends of the second connecting plate 210 are rotatably connected to the two ends of the first connecting plate 29 and the third connecting plate 211, and the two ends of the fourth connecting plate 212 are rotatably connected to the two ends of the third connecting plate 211 and the fifth connecting plate 213.

[0065] The first connecting plate 29 and the fifth connecting plate 213 have the same length, and the second connecting plate 210, the third connecting plate 211 and the fourth connecting plate 212 have the same length.

[0066] The movable plate 214 is slidably connected to the limiting groove 24 in the horizontal direction, and the two ends of the feeding screw 23 are rotatably connected to the inside of the mounting frame 21 through bearings.

[0067] Please see Figure 4 and Figure 5 In the initial working state, the first slider 25, the second slider 26, the third slider 27 and the fourth slider 28 do not move but are stuck together. At this time, the first connecting plate 29, the second connecting plate 210, the third connecting plate 211, the fourth connecting plate 212 and the fifth connecting plate 213 are in a folded state, and the spring tube 216 has not yet extended, and the nozzle 215 is in its minimum range.

[0068] Please see Figure 6 and Figure 7 The user starts the feeding motor 22 to control the feeding screw 23 to rotate. During the rotation of the feeding screw 23, the first slider 25, the second slider 26, the third slider 27 and the fourth slider 28 are controlled to move along the horizontal direction of the limiting groove 24. Due to the distance limitation of the first connecting plate 29, the second connecting plate 210, the third connecting plate 211, the fourth connecting plate 212 and the fifth connecting plate 213, the first slider 25, the second slider 26, the third slider 27 and the fourth slider 28 always move at equal distances. During the movement, the spring tube 216 is controlled to extend. At this time, the spray pipe 215 also moves at equal distances to expand the spraying range.

[0069] This embodiment:

[0070] The concentrated liquid can be evenly dispersed into the alkaline solution system through the equidistantly adjustable nozzles 215. The output of each nozzle 215 is consistent. The equidistant design ensures uniform coverage, allowing the concentrated liquid and alkaline solution to react slowly and evenly, avoiding sudden changes in local supersaturation, ensuring that impurity precipitation and lithium carbonate crystallization proceed in an orderly manner, and reducing the adsorption and loss of valuable substances and the entrainment of impurities.

[0071] Secondly, it can improve the mixing uniformity of the reaction system and enhance the mass transfer efficiency. The equidistant distribution design can cover the top space of the extraction box 1. Combined with the stirring mechanism 5, it can quickly blend the concentrate with the alkali solution, break the local concentration gradient caused by a single addition port, and form a uniform reaction environment. Uniform mixing can accelerate the lithium mass transfer rate, avoid incomplete reaction due to insufficient local lithium, and at the same time make the lithium carbonate crystal growth more uniform, resulting in higher efficiency in subsequent filtration and washing.

[0072] Furthermore, the first slider 25, the second slider 26, the third slider 27, and the fourth slider 28 move at equal intervals throughout their movement. This design allows for adaptive adjustment to accommodate concentrates of different concentrations. When the concentrate concentration is high, the movement range can be expanded to the maximum, while when the concentrate concentration is low, the spacing between injections can be reduced.

[0073] Second embodiment:

[0074] Please refer to 8 to Figure 10 It also includes reciprocating mechanism 3;

[0075] A top plate 4 is fixed at the middle of the bottom of the extraction box 1. A stirring mechanism 5 is installed inside the top plate 4. The stirring mechanism 5 includes a stirring rod 51 that is rotatably connected to the middle of the top plate 4 and located inside the extraction box 1. A gear 52 is connected to the top of the stirring rod 51 via a keyway.

[0076] The reciprocating mechanism 3 includes a mounting plate 31 installed on the top of the extraction box 1 and located on one side of the top plate 4. A reciprocating motor 32 is bolted to the side wall of the mounting plate 31. A reciprocating screw 33 is connected to the output shaft of the reciprocating motor 32 via a keyway. A slide rod 34 is fixed on the top of the mounting plate 31 and located on one side of the reciprocating screw 33. A reciprocating plate 35 is threaded to the outside of the reciprocating screw 33. A reciprocating rack 36 is installed on one side of the reciprocating plate 35.

[0077] The reciprocating rack 36 and the gear 52 mesh with each other, the reciprocating plate 35 slides horizontally about the slide rod 34, and the two ends of the reciprocating screw 33 are rotatably connected to the mounting plate 31.

[0078] It also includes a stirring mechanism 5;

[0079] A top frame 53 is installed on the upper surface of the top plate 4. A stirring motor 54 is installed on the top of the top frame 53. A key rod 55 is connected to the output shaft of the stirring motor 54 via a keyway. A sliding sleeve 56 is slidably connected to the outer wall of the key rod 55. A positioning bolt 57 is threadedly connected to the outer wall of the sliding sleeve 56.

[0080] The shaft of the gear 52 is connected to the keyway at the bottom of the key rod 55. The positioning bolt 57 passes through the inside of the sliding sleeve 56 and extends to the outer wall of the key rod 55. The sliding sleeve 56 and the gear 52 are fixedly connected.

[0081] Please see Figure 8 and Figure 9 When the user starts the reciprocating motor 32, the reciprocating screw 33 can be controlled to rotate forward and backward within the mounting plate 31. During the rotation of the reciprocating screw 33, the transmission controls the reciprocating plate 35 to move left and right along the horizontal direction of the mounting plate 31. During the horizontal reciprocating movement of the reciprocating plate 35, the reciprocating rack 36 can drive the gear 52 to drive the stirring rod 51 to rotate forward and backward within the extraction box 1.

[0082] Understandably, since the reciprocating plate 35 slides between the sliding rod 34 and the sliding plate 35, the sliding rod 34 can restrict the movement trajectory of the reciprocating plate 35, ensuring that the reciprocating plate 35 can only move horizontally along the sliding rod 34.

[0083] Please seeFigure 10 In actual operation, the user can rotate and loosen the positioning bolt 57, and then slide the sliding sleeve 56 upward along the key rod 55 in the vertical direction to drive the gear 52 to rise. The gear 52 rises and separates from the reciprocating rack 36. After separation, the user can start the stirring motor 54 to control the key rod 55 to drive the stirring rod 51 to rotate. In this way, the user can independently control the stirring rod 51 to work.

[0084] This embodiment:

[0085] The reciprocating mechanism 3 drives the stirring mechanism 5 to rotate in both directions, periodically changing the stirring direction, which can disrupt the stable laminar flow structure and form strong turbulence and shearing effects. When the stirring rod 51 rotates in the forward direction, it pushes the material upward and pulls the material downward when it rotates in the reverse direction, so that the two liquids form a circulating composite flow field in the equipment, covering all areas, ensuring that the reaction proceeds uniformly in the whole system and avoiding sudden changes in local supersaturation.

[0086] Meanwhile, the forward and reverse rotation stirring can control the supersaturation of lithium carbonate crystallization within a reasonable range by periodically changing the flow field direction. When rotating forward, the crystals begin to grow, and when rotating in reverse, the fine grain protrusions on the crystal surface are sheared off, promoting uniform crystal growth and forming particles with narrow particle size distribution and smooth surface. At the same time, it can also meet the processing requirements of battery-grade lithium carbonate.

[0087] Third embodiment:

[0088] Please see Figure 11 and Figure 12 It also includes a flipping mechanism 6;

[0089] The flipping mechanism 6 is distributed in a mirror image with respect to the two sides inside the extraction box 1, and trigger plates 37 are installed on both sides of the reciprocating plate 35 and on the side away from the reciprocating rack 36.

[0090] The flipping mechanism 6 includes a mounting base 61 fixedly installed on the inner wall of the extraction box 1. A flipping plate 62 is rotatably installed inside the mounting base 61 via a torsion spring. A trigger rod 63 is installed above the flipping plate 62. A base plate 64 is fixedly installed below the flipping plate 62. Middle plates 65 are rotatably connected to both sides of the mounting base 61. Motion plates 66 are fixedly installed on the outer walls of both middle plates 65. A connecting rod 67 is fixedly installed on the opposite side of the two motion plates 66.

[0091] The trigger rod 63 and the trigger plate 37 are in the same horizontal direction, and both middle plates 65 are connected to the keyway in the middle position of the flip plate 62.

[0092] Please see Figure 11 In the initial working state, the trigger plate 37 does not contact the trigger rod 63. At this time, the flip plate 62 does not control the movement of the base plate 64 in the initial state, while the moving plate 66 is in the initial tilt state.

[0093] Please see Figure 12 In the second embodiment, during the reciprocating movement of the reciprocating plate 35, the trigger plate 37 will reciprocate. The trigger plate 37 can be controlled by the trigger rod 63 to control the flipping plate 62 to flip at the hinge position of the mounting base 61. When the flipping plate 62 flips, it can simultaneously drive the bottom plate 64 to flip, and at the same time drive the middle plate 65 to control the movement plate 66 to flip. By flipping the movement plate 66, the concentrate and alkali in the middle section of the extraction box 1 are mixed, while the bottom plate 64 can flip the concentrate at the bottom of the extraction box 1 towards the middle position.

[0094] This embodiment:

[0095] The reciprocating forward and reverse rotation combined with the side-flipping mechanism 6 is responsible for laterally flipping the material, forming a three-dimensional flow field that combines radial diffusion, axial circulation and lateral flipping. The side-flipping mechanism 6 can periodically flip the material in the corner to the center of the system, superimposed with the turbulence formed by forward and reverse rotation, completely covering all areas. Secondly, it can peel off the impurity precipitates attached to the wall of the extraction box 1, preventing them from accumulating and adsorbing lithium for a long time. Combined with the shearing effect of forward and reverse rotation, it breaks up the impurity agglomerates, allowing the precipitate particles to be evenly dispersed and settle quickly, reducing the adsorption of lithium and ensuring that the impurity precipitate is fully separated from the solution.

[0096] A process for recovering metals from spodumene impurity slag includes the following steps:

[0097] S1: Prepare a NaOH solution of appropriate concentration;

[0098] S2: The slag from the first impurity removal of spodumene is mixed with NaOH solution in a certain proportion and stirred at a certain temperature for a period of time. After the reaction is completed, leachate A and leaching residue A are obtained. Leaching residue A is washed for a certain period of time.

[0099] S3: The leachate obtained in step two is purified by passing it through an ion exchange resin at a certain flow rate to further remove calcium and magnesium impurities and obtain a qualified resin solution.

[0100] S4: The obtained qualified liquid is heated on an electric furnace to rapidly concentrate it and control the lithium content within a certain range;

[0101] S5: Prepare an alkaline solution for lithium precipitation reaction according to a certain ratio, and heat the concentrated solution and alkaline solution from step four to a certain temperature in a water bath respectively.

[0102] S6: Slowly add the concentrate to the alkali solution at a certain flow rate, stir continuously for a period of time, filter and separate. In this step, the alkali solution and concentrate need to be stirred and mixed in the extraction tank 1 during the operation.

[0103] S7: Take the filter residue from step six, add water in a certain proportion, wash it, and dry it at a certain temperature to obtain battery-grade lithium carbonate.

[0104] S8: Prepare magnesium chloride solution in a certain proportion, mix the leaching residue from step two in a certain solid-liquid ratio, stir at a certain temperature for a period of time to carry out a metathesis reaction, and after the reaction is completed, obtain leaching solution B and leaching residue B. Leaching residue B is washed with water and dried for a period of time.

[0105] S9: Add a certain concentration of concentrated hydrogen chloride solution to filtrate B to adjust the pH and react for a period of time to remove the influence of possible carbonate ions. Evaporate and crystallize to obtain calcium chloride.

[0106] S10: Wash the filter residue B from step eight with water several times, and stir it at a certain temperature for a period of time to obtain magnesium hydroxide.

[0107] This process features a short process flow, low energy consumption, and high metal recovery rate. In particular, it achieves the synergistic recovery of three valuable elements: calcium, magnesium, and lithium, which significantly improves resource utilization. At the same time, the entire process is environmentally friendly, providing a new technical path for the high-value utilization of lithium spodumene extraction waste.

[0108] Please refer to the reference again. Figures 1 to 13 The working principle of the equipment and recycling process for extracting metals from spodumene impurity residue provided by this invention is as follows:

[0109] Step S1: Slowly add the concentrate;

[0110] The user starts the feeding motor 22 to control the feeding screw 23 to rotate. During the rotation of the feeding screw 23, the first slider 25, the second slider 26, the third slider 27 and the fourth slider 28 are controlled to move along the horizontal direction of the limiting groove 24. Due to the distance limitation of the first connecting plate 29, the second connecting plate 210, the third connecting plate 211, the fourth connecting plate 212 and the fifth connecting plate 213, the first slider 25, the second slider 26, the third slider 27 and the fourth slider 28 move at equal distances. During the movement, the spring tube 216 is controlled to extend. At this time, the spray nozzle 215 also moves at equal distances to expand the spraying range. The user can connect the external concentrated liquid loading device and the hose 217, and pump the concentrated liquid into the spring tube 216 through the software 217, and then inject it into the extraction box 1 from the spray nozzle 215.

[0111] Step S2: The user starts the reciprocating motor 32 to control the reciprocating screw 33 to rotate forward and backward within the mounting plate 31. During the rotation of the reciprocating screw 33, the transmission controls the reciprocating plate 35 to move left and right along the horizontal direction of the mounting plate 31. During the horizontal reciprocating movement of the reciprocating plate 35, it can drive the reciprocating rack 36 to control the gear 52 to drive the stirring rod 51 to rotate forward and backward within the extraction box 1. The rotation of the stirring rod 51 within the extraction box 1 can fully mix the concentrate and the alkali solution.

[0112] 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 extracting metals from spodumene slag, characterized in that, Includes extraction box and feeding mechanism; The feeding mechanism includes a mounting frame installed on the outer wall of the extraction box. A feeding motor is bolted to the side wall of the mounting frame. The output shaft of the feeding motor is keyway connected to a feeding screw. A first slider, a second slider, a third slider, and a fourth slider are threaded to the outer wall of the feeding screw. A limit groove is provided inside the mounting frame. A movable plate is fixed to the top of each of the first, second, third, and fourth sliders. A nozzle is installed on the side wall of the movable plate. A spring tube is installed at the inlet end of the nozzle. A flexible hose is sealed on the side wall of the spring tube. A first connecting plate is rotatably connected to the bottom of the mounting frame. A second connecting plate is rotatably connected to the bottom of the first slider. A third connecting plate is rotatably connected to the bottom of the second slider. A fourth connecting plate is rotatably connected to the bottom of the third slider. A fifth connecting plate is rotatably connected to the bottom of the fourth slider.

2. The equipment for extracting metals from spodumene slag according to claim 1, characterized in that, The two ends of the second connecting plate are rotatably connected to the two ends of the first connecting plate and the third connecting plate, and the two ends of the fourth connecting plate are rotatably connected to the two ends of the third connecting plate and the fifth connecting plate.

3. The apparatus for extracting metals from spodumene slag according to claim 1, characterized in that, The first and fifth connecting plates are of equal length, and the second, third, and fourth connecting plates are of equal length.

4. The apparatus for extracting metals from spodumene slag according to claim 1, characterized in that, The movable plate is slidably connected to the limiting groove in the horizontal direction, and the two ends of the feeding screw are rotatably connected to the inside of the mounting frame through bearings.

5. The apparatus for extracting metals from spodumene slag according to claim 1, characterized in that, It also includes reciprocating mechanisms; A top plate is fixed at the bottom center of the extraction box. A stirring mechanism is installed inside the top plate. The stirring mechanism includes a stirring rod rotatably connected to the top plate at the center and located inside the extraction box. A gear is connected to the top of the stirring rod via a keyway. The reciprocating mechanism includes a mounting plate installed on the top of the extraction box and located on one side of the top plate. A reciprocating motor is bolted to the side wall of the mounting plate. A reciprocating screw is connected to the output shaft of the reciprocating motor via a keyway. A slide rod is fixed on the top of the mounting plate and located on one side of the reciprocating screw. A reciprocating plate is threaded to the outside of the reciprocating screw. A reciprocating rack is installed on one side of the reciprocating plate. The reciprocating rack and gear mesh with each other, the reciprocating plate slides horizontally with respect to the slide rod, and the two ends of the reciprocating screw are rotatably connected to the mounting plate.

6. The apparatus for extracting metals from spodumene slag according to claim 5, characterized in that, It also includes a stirring mechanism; A top frame is installed on the upper surface of the top plate, a stirring motor is installed on the top of the top frame, a key rod is connected to the output shaft of the stirring motor via a keyway, a sliding sleeve is slidably connected to the outer wall of the key rod, and a positioning bolt is threadedly connected to the outer wall of the sliding sleeve. The gear's shaft is connected to the keyway at the bottom of the key rod. The positioning bolt passes through the inside of the sliding sleeve and extends to the outer wall of the key rod. The sliding sleeve and the gear are fixedly connected.

7. The apparatus for extracting metals from spodumene slag according to claim 5, characterized in that, It also includes a flipping mechanism; The flipping mechanism is mirror-distributed about both sides of the inside of the extraction box, and trigger plates are installed on both sides of the reciprocating plate and on the side away from the reciprocating rack. The flipping mechanism includes a mounting base fixedly installed on the inner wall of the extraction box. A flipping plate is rotatably installed inside the mounting base via a torsion spring. A trigger rod is installed above the flipping plate. A base plate is fixedly installed below the flipping plate. Middle plates are rotatably connected to both sides of the mounting base. Motion plates are fixedly installed on the outer walls of both middle plates. A connecting rod is fixedly installed on the opposite side of the two motion plates.

8. The apparatus for extracting metals from spodumene slag according to claim 7, characterized in that, The trigger rod and the trigger plate are in the same horizontal direction, and both of the middle plates are connected to the keyway in the middle position of the flip plate.

9. A process for recovering metals from spodumene impurity slag, characterized in that, The process for recovering metals from spodumene impurity removal slag includes an apparatus for extracting metals from spodumene impurity removal slag as described in any one of claims 1-8, comprising the following steps: S1: Prepare a NaOH solution of appropriate concentration; S2: The slag from the first impurity removal of spodumene is mixed with NaOH solution in a certain proportion and stirred at a certain temperature for a period of time. After the reaction is completed, leachate A and leaching residue A are obtained. Leaching residue A is washed for a certain period of time. S3: The leachate obtained in step two is purified by passing it through an ion exchange resin at a certain flow rate to further remove calcium and magnesium impurities and obtain a qualified resin solution. S4: The obtained qualified liquid is heated on an electric furnace to rapidly concentrate it and control the lithium content within a certain range; S5: Prepare an alkaline solution for lithium precipitation reaction according to a certain ratio, and heat the concentrated solution and alkaline solution from step four to a certain temperature in a water bath respectively. S6: Slowly add the concentrate to the alkali solution at a certain flow rate, stir continuously for a period of time, and filter to separate. In this step, the alkali solution and concentrate need to be stirred and mixed in the extraction tank during the operation. S7: Take the filter residue from step six, add water in a certain proportion, wash it, and dry it at a certain temperature to obtain battery-grade lithium carbonate. S8: Prepare magnesium chloride solution in a certain proportion, mix the leaching residue from step two in a certain solid-liquid ratio, stir at a certain temperature for a period of time to carry out a metathesis reaction, and after the reaction is completed, obtain leaching solution B and leaching residue B. Leaching residue B is washed with water and dried for a period of time. S9: Add a certain concentration of concentrated hydrogen chloride solution to filtrate B to adjust the pH and react for a period of time to remove the influence of possible carbonate ions. Evaporate and crystallize to obtain calcium chloride. S10: Wash the filter residue B from step eight with water several times, and stir it at a certain temperature for a period of time to obtain magnesium hydroxide.

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