A method and equipment for extracting and recovering tantalum and niobium metals from lepidolite tailings

Abstract

The application provides a method and equipment for extracting and recovering tantalum and niobium metals from lithium mica tailings, and relates to the technical field of metal material recovery, and comprises the following steps: step S1, crushing and ball milling the tailings to a certain fineness; step S2, preliminarily enriching tantalum and niobium minerals in the tailings by using a gravity separation method to obtain a rough tantalum and niobium concentrate and a rough tailing; and step S3, performing one-time sweeping on the rough tailing by using a high gradient magnetic separation method to obtain a rough tantalum and niobium concentrate and a magnetic separation tailing. The scheme finally realizes the third shaking table concentration after the first shaking table tantalum and niobium concentrate and the second shaking table tantalum and niobium concentrate are mixed uniformly, and finally obtains a tantalum and niobium concentrate with a grade greater than 18% and a recovery rate greater than 40%. The lithium mica tailings contain a certain amount of valuable metal elements such as tantalum and niobium, and the method can recover and utilize these originally discarded rare metals, reduce resource waste, and improve the comprehensive utilization rate of mineral resources.

Description

Technical Field

[0001] This invention relates to the field of metal material recycling, and in particular to a method and equipment for extracting and recovering tantalum and niobium metal from lepidolite tailings. Background Technology

[0002] Lithium mica tailings are solid wastes remaining after lithium concentrate extraction from lithium mica ore. Lithium mica ore usually contains other elements such as fluorine, thallium, rubidium, and cesium. During the lithium extraction process, these elements may be enriched or transformed into the tailings. If they are randomly piled up or landfilled, the heavy metals and harmful substances such as fluorine may leach into groundwater and soil through rainwater, causing environmental pollution. However, by extracting and recovering tantalum and niobium metals from lithium mica tailings, solid waste can be utilized as a resource, which is a win-win strategy for achieving sustainable resource utilization and environmental protection.

[0003] In related technologies, lepidolite tailings require crushing to extract and recover tantalum and niobium metals. However, some existing tailings crushing equipment is not convenient for controlling the particle size of lepidolite tailings. The tantalum and niobium minerals in lepidolite tailings are usually dense, low in content, and brittle, making them extremely sensitive to particle size. If the particle size after crushing cannot be effectively controlled, the recovery rate of tantalum and niobium metals will be severely reduced, and subsequent sorting operations will be affected.

[0004] Therefore, it is necessary to provide a method and equipment for extracting and recovering tantalum and niobium metal from lepidolite tailings to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides a method and equipment for extracting and recovering tantalum and niobium metal from lepidolite tailings, which solves the problem that some existing tailings crushing equipment is not convenient for controlling the particle size of lepidolite tailings during use.

[0006] To solve the above-mentioned technical problems, the method for extracting and recovering tantalum and niobium metal from lepidolite tailings provided by the present invention includes the following steps:

[0007] Step S1: Crush and ball mill the tailings to a certain fineness;

[0008] Step S2: The tantalum and niobium minerals in the tailings are initially enriched by gravity separation to obtain rough tantalum and niobium concentrate and rough tailings;

[0009] Step S3: Use high gradient magnetic separation to perform a single scavenging of the roughing tailings to obtain roughing tantalum-niobium concentrate and magnetic tailings;

[0010] Step S4: After the rough tantalum-niobium concentrate is mixed evenly, it is subjected to a shaking table cleaning process to obtain shaking table tailings I, shaking table middlings I, and tantalum-niobium concentrate I;

[0011] Step S5: After ball milling the middlings I of the shaking table, perform a shaking table fine cleaning to obtain shaking table tantalum-niobium concentrate I, shaking table middlings II, and shaking table tailings II;

[0012] Step S6: Perform a shaking table cleaning process on tantalum-niobium concentrate I to obtain high-grade tantalum-niobium concentrate, middlings, and tailings;

[0013] Step S7 involves further processing the tantalum-niobium concentrate to recover tantalum-niobium metal.

[0014] A device for extracting and recovering tantalum and niobium metal from lepidolite tailings includes: a crushing frame, a drive mechanism, a particle size adjustment mechanism, and a crushing mechanism;

[0015] The drive mechanism includes a mounting frame, a drive shaft, and two electric telescopic rods. The left side of the mounting frame is fixed to the right side of the crushing frame. The drive shaft is longitudinally rotatably connected to the inside of the mounting frame. Both ends of the drive shaft are fixed with drive gears. The two electric telescopic rods are respectively fixed to the front and rear sides of the mounting frame. The front and rear sides of the mounting frame are both fixed with slide rails. The surfaces of the two slide rails are slidably connected with drive tooth plates. The two drive tooth plates mesh with the two drive gears respectively. The output ends of the two electric telescopic rods are respectively fixedly connected to the two drive tooth plates. The front and back sides of the mounting frame are both fixed with protective frames.

[0016] The particle size adjustment mechanism includes a drive bracket, a guide rail, and an adjustment seat. The drive bracket is fixed to the circumferential side of the drive shaft, the guide rail is fixed to the front side of the inner wall of the crushing frame, and the adjustment seat is slidably connected to the guide rail. A first connecting rod is rotatably connected to the surface of the drive bracket, and the left side of the first connecting rod is rotatably connected to the adjustment seat. A rotating seat is rotatably connected to the right side of the inner wall of the crushing frame, and a rotating bracket is rotatably connected inside the rotating seat. A second connecting rod is rotatably connected to the inner side of the rotating bracket, and the second connecting rod is rotatably connected to the adjustment seat. A torsion spring is provided on the surface of the rotating bracket.

[0017] The crushing mechanism is located inside the crushing frame and is used to crush lepidolite tailings.

[0018] Preferably, the particle size adjustment mechanism has two sets arranged in a mirror image to adjust the particle size of the lithium mica tailings. The surface of the adjustment seat is provided with bolts, and the inside of the crushing frame is provided with through holes. The adjustment seat and the crushing frame are connected by bolts and through holes.

[0019] Preferably, the crushing mechanism includes two toothed rollers disposed inside the crushing frame. The left toothed roller is rotatably connected to the crushing frame, and the right toothed roller is rotatably connected to two adjusting seats. An adjusting groove for use with the right toothed roller is provided inside the crushing frame. A transmission wheel is fixedly provided at one end of each of the two toothed rollers. A support seat is fixedly provided on the surface of the crushing frame. Two drive motors are provided on the top of the support seat. A drive wheel is fixedly provided at the output end of each of the two drive motors. The two transmission wheels and drive wheels are divided into two groups, front and rear. Multiple transmission belts are sleeved on the surface of each group of transmission wheels and drive wheels.

[0020] Preferably, the bottom of the crushing frame is provided with a screening mechanism, the screening mechanism includes a screening frame disposed at the bottom of the crushing frame, an adjustable screen plate is slidably connected to the inner side of the screening frame, a fixed screen plate is fixedly disposed inside the screening frame and at the bottom of the adjustable screen plate, and two adjusting toothed plates are fixedly disposed on the right side of the top of the adjustable screen plate.

[0021] Preferably, the mounting bracket is internally rotatably connected to a rotating shaft, and two pulleys are fixedly mounted on the surfaces of the rotating shaft and the drive shaft, respectively. The four pulleys are divided into front and rear groups, and each group of pulleys is fitted with a belt. Both ends of the rotating shaft are keyway connected to adjusting gears, and the two adjusting gears mesh with two adjusting gear plates respectively.

[0022] Preferably, a display mechanism is vertically rotatably connected inside the mounting frame. The display mechanism includes a drive screw vertically rotatably connected inside the mounting frame. A screw block is threadedly connected to the surface of the drive screw. A display frame is slidably connected to the surface of the screw block. A display plate is fixed to the back of the display frame. The top end of the drive screw is rotatably connected to the display frame. An indicator frame is fixed to the right side of the screw block. Bevel gears are fixed to the bottom end of the drive screw and the surface of the drive shaft. The two bevel gears mesh with each other.

[0023] Preferably, the bottom of the display frame is fixedly connected to the top of the mounting frame, and the surface of the display panel is provided with scale lines. By observing the height position of the indicator frame on the display panel, the crushing particle size and the particle size of the lepidolite tailings can be determined.

[0024] Preferably, the crushing frame has two water pipes rotatably connected to its interior, and the surfaces of the two water pipes are connected to multiple atomizing nozzles. Two protective baffles are respectively provided on both sides of the inner wall of the crushing frame.

[0025] Compared with related technologies, the method and equipment for extracting and recovering tantalum and niobium metal from lepidolite tailings provided by this invention have the following advantages:

[0026] First, the tailings are crushed and ball-milled to a certain fineness. Then, the tailings undergo one roughing, one scavenging, and three cleaning processes. The medium and tailings from the first roughing process are then processed into the scavenging and roughing tantalum-niobium concentrate for shaking table cleaning. The tailings from the first shaking table cleaning are returned to the crushing and ball milling. The tantalum-niobium concentrate from the first shaking table cleaning and the medium from the first shaking table cleaning are then regrinded. The tantalum-niobium concentrate from the second shaking table cleaning is then processed into the second shaking table cleaning. The medium and tailings from the second shaking table cleaning are then returned to the crushing and ball milling. The tantalum-niobium concentrate from the first and second shaking table cleanings are then mixed evenly and processed into the third shaking table cleaning. Finally, a tantalum-niobium concentrate with a grade greater than 18% and a recovery rate greater than 40% is obtained. Lithium mica tailings contain a certain amount of valuable metal elements such as tantalum and niobium. This method can recycle these originally discarded rare metals, reduce resource waste, and improve the comprehensive utilization rate of mineral resources. At the same time, flotation agents can be added after the roughing and scavenging processes to extract Li2O. The Li2O obtained by flotation has a grade greater than 4.0% and a recovery rate greater than 80%. This method can effectively improve the comprehensive utilization rate of lepidolite tailings. 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 A process flow diagram for the recovery of tantalum and niobium provided by the present invention;

[0029] Figure 2 The optimal structural schematic diagram provided for this invention;

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

[0031] Figure 4 A schematic diagram of the drive mechanism provided by the present invention;

[0032] Figure 5 This is a schematic diagram of the particle size adjustment mechanism provided by the present invention;

[0033] Figure 6 The diagram shows the state in which the adjusting seat slides to the right on the slide rail surface through the cooperation of the drive gear and drive tooth plate for the retraction of the two electric telescopic rods provided by the present invention.

[0034] Figure 7 A schematic diagram of the state of the crushing mechanism provided by the present invention;

[0035] Figure 8A schematic diagram of the screening mechanism provided by the present invention;

[0036] Figure 9 for Figure 8 The diagram shows the state in which the adjusting gear rotates, causing the adjusting sieve plate to slide to the left via the adjusting toothed plate.

[0037] Figure 10 This is a schematic diagram of the display mechanism provided by the present invention;

[0038] Figure 11 for Figure 10 The diagram shows a cross-sectional view of the display frame.

[0039] Figure 12 for Figure 10 The diagram shows the state in which the drive shaft rotates clockwise, driving the screw block and display panel to move upward through the bevel gear.

[0040] Explanation of icon numbers:

[0041] 1. Crushing frame;

[0042] 2. Drive mechanism; 21. Mounting bracket; 22. Drive shaft; 23. Electric telescopic rod; 24. Drive gear; 25. Slide rail; 26. Drive gear plate; 27. Protective frame;

[0043] 3. Particle size adjustment mechanism; 31. Drive bracket; 32. Guide rail; 33. Adjustment seat; 34. First connecting rod; 35. Rotating seat; 36. Rotating bracket; 37. Second connecting rod; 38. Torsion spring;

[0044] 4. Crushing mechanism; 41. Toothed roller; 42. Transmission wheel; 43. Drive motor; 44. Drive wheel; 45. Transmission belt;

[0045] 5. Support base;

[0046] 6. Screening mechanism; 61. Screening frame; 62. Adjusting screen plate; 63. Fixed screen plate; 64. Adjusting toothed plate; 65. Rotating shaft; 66. Pulley; 67. Belt; 68. Adjusting gear;

[0047] 7. Display mechanism; 71. Drive screw; 72. Screw block; 73. Display frame; 74. Display panel; 75. Indicator frame; 76. Bevel gear;

[0048] 8. Water pipe; 9. Atomizing nozzle; 10. Protective baffle. Detailed Implementation

[0049] 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.

[0050] This invention provides a method and equipment for extracting and recovering tantalum and niobium metal from lepidolite tailings.

[0051] First embodiment:

[0052] Please see Figure 1 A method for extracting and recovering tantalum and niobium metal from lepidolite tailings includes the following steps:

[0053] Step S1: Crush and ball mill the tailings to a certain fineness;

[0054] Step S2: The tantalum and niobium minerals in the tailings are initially enriched by gravity separation to obtain rough tantalum and niobium concentrate and rough tailings;

[0055] Step S3: Use high gradient magnetic separation to perform a single scavenging of the roughing tailings to obtain roughing tantalum-niobium concentrate and magnetic tailings;

[0056] Step S4: After the rough tantalum-niobium concentrate is mixed evenly, it is subjected to a shaking table cleaning process to obtain shaking table tailings I, shaking table middlings I, and tantalum-niobium concentrate I;

[0057] Step S5: After ball milling the middlings I of the shaking table, perform a shaking table fine cleaning to obtain shaking table tantalum-niobium concentrate I, shaking table middlings II, and shaking table tailings II;

[0058] Step S6: Perform a shaking table cleaning process on tantalum-niobium concentrate I to obtain high-grade tantalum-niobium concentrate, middlings, and tailings;

[0059] Step S7: Further process the tantalum-niobium concentrate to recover tantalum-niobium metal;

[0060] Preferably, in step S1, the particle size of the ball-milled product is less than 0.074 mm, accounting for more than 55%;

[0061] Preferably, in step S2, the roughing process uses a SLon vertical ring high gradient magnetic separator with a background magnetic field strength of 0.7T, a ring rotation speed of 2r / min, a cylindrical magnetic medium diameter of 2mm, a pulse frequency of 150 times / min, a feed rate of 45kg / h, and a slurry flow rate of 180L / min.

[0062] Preferably, the background magnetic field strength in step S3 is 0.9T, while other process conditions remain unchanged;

[0063] Preferably, the process conditions for selecting the shaking table in step S4 are: shaking table stroke rate 40Hz, rinsing water volume 900 L / h, and stroke 15mm.

[0064] Preferably, in step S5, the fineness of the ore regrinded on the shaking table is more than 65% less than 0.074 mm, and the shaking table process conditions remain unchanged;

[0065] Preferably, the middlings and tailings obtained from the shaking table in steps S4 and S5 are returned together to step S1 for ball milling;

[0066] Preferably, the middlings and tailings obtained from the shaking table in step S6 are returned together to step S4 and mixed with ball milling material for shaking table fine selection;

[0067] Preferably, the ore concentration in steps S2-S6 is 15%-20%.

[0068] In this embodiment, the tailings are first crushed and ball-milled to a certain fineness. Then, the tailings undergo one roughing, one scavenging, and three cleaning processes. The medium and tailings from the first roughing process are then processed into the scavenging and roughing tantalum-niobium concentrate for shaking table cleaning. The tailings from the first shaking table cleaning are returned to the crushing and ball milling. The tantalum-niobium concentrate from the first shaking table cleaning and the medium from the first shaking table cleaning are then retoughened. The tantalum-niobium concentrate from the second shaking table cleaning is then processed into the second shaking table cleaning. The medium and tailings from the second shaking table cleaning are then returned to the crushing and ball milling. After the tantalum-niobium concentrate from the first and second shaking table cleanings are mixed evenly, the third shaking table cleaning is performed. The process yields tantalum-niobium concentrate with a grade greater than 18% and a recovery rate greater than 40%. Lithium mica tailings contain a certain amount of valuable metal elements such as tantalum and niobium. This method can recycle these previously discarded rare metals, reducing resource waste and improving the comprehensive utilization rate of mineral resources. At the same time, after roughing and scavenging, flotation agents can be added to extract Li2O. The Li2O obtained by flotation has a grade greater than 4.0% and a recovery rate greater than 80%. This method can effectively improve the comprehensive utilization rate of lithium mica tailings.

[0069] Second embodiment:

[0070] Please see Figures 2 to 6 A device for extracting and recovering tantalum and niobium metal from lepidolite tailings, comprising: a crushing frame 1, a drive mechanism 2, a particle size adjustment mechanism 3, and a crushing mechanism 4;

[0071] The drive mechanism 2 includes a mounting frame 21, a drive shaft 22, and two electric telescopic rods 23. The left side of the mounting frame 21 is fixed to the right side of the crushing frame 1. The drive shaft 22 is longitudinally rotatably connected to the inside of the mounting frame 21. Both ends of the drive shaft 22 are fixed with drive gears 24. The two electric telescopic rods 23 are respectively fixed to the front and rear sides of the mounting frame 21. The front and rear sides of the mounting frame 21 are both fixed with slide rails 25. The surfaces of the two slide rails 25 are slidably connected with drive tooth plates 26. The two drive tooth plates 26 mesh with the two drive gears 24 respectively. The output ends of the two electric telescopic rods 23 are respectively fixedly connected to the two drive tooth plates 26. The front and back sides of the mounting frame 21 are both fixed with protective frames 27.

[0072] The particle size adjustment mechanism 3 includes a drive bracket 31, a guide rail 32, and an adjustment seat 33. The drive bracket 31 is fixed to the circumferential side of the drive shaft 22. The guide rail 32 is fixed to the front side of the inner wall of the crushing frame 1. The adjustment seat 33 is slidably connected to the guide rail 32. A first connecting rod 34 is rotatably connected to the surface of the drive bracket 31. The left side of the first connecting rod 34 is rotatably connected to the adjustment seat 33. A rotating seat 35 is rotatably connected to the right side of the inner wall of the crushing frame 1. A rotating bracket 36 is rotatably connected inside the rotating seat 35. A second connecting rod 37 is rotatably connected to the inner side of the rotating bracket 36. The second connecting rod 37 is rotatably connected to the adjustment seat 33. A torsion spring 38 is provided on the surface of the rotating bracket 36.

[0073] The crushing mechanism 4 is located inside the crushing frame 1 and is used to crush the lithium mica tailings.

[0074] The particle size adjustment mechanism 3 is arranged in two sets in a mirror image to adjust the particle size of the lithium mica tailings. The surface of the adjustment seat 33 is provided with bolts, and the inside of the crushing frame 1 is provided with through holes. The adjustment seat 33 and the crushing frame 1 are connected by bolts and through holes.

[0075] Please combine Figure 4 : Activate the two electric telescopic rods 23, the two electric telescopic rods 23 retract and thus drive the two drive gear plates 26 to slide to the left on the surface of the slide rail 25. The two drive gear plates 26 move to the left and thus drive the two drive gears 24 to rotate clockwise. The clockwise rotation of the two drive gears 24 drives the drive shaft 22 to rotate clockwise.

[0076] Please combine Figure 5 and Figure 6When the drive shaft 22 rotates clockwise, it will simultaneously drive the two drive brackets 31 to rotate clockwise. Through the first connecting rod 34, the two adjusting seats 33 will be pulled to the right, causing the adjusting seats 33 to slide to the right on the surface of the guide rail 32. When the two adjusting seats 33 move to the right, they will drive the right toothed roller 41 to move to the right, thereby adjusting the distance between the two toothed rollers 41 and thus adjusting the particle size of the lithium mica tailings.

[0077] Furthermore, when the two adjusting seats 33 move to the right, the second connecting rod 37 causes the rotating bracket 36 to rotate within the rotating seat 35, and the torsion spring 38 to rotate in a contracting manner. The arrangement of the second connecting rod 37, the rotating bracket 36, and the torsion spring 38 improves the stability of the adjusting seats 33 during movement.

[0078] Furthermore, before adjusting the position of the adjusting seat 33, the nut on the bolt needs to be unscrewed. During the adjustment process, the bolt will move inside the through hole. After the position of the adjusting seat 33 is adjusted, the nut can be screwed back on.

[0079] Preferably, the crushing frame 1 has a groove inside that cooperates with the two first connecting rods 34, allowing the first connecting rods 34 to move.

[0080] In this embodiment, the retraction of two electric telescopic rods 23 drives two drive toothed plates 26 to move to the left, thereby causing the drive gear 24 to drive the drive shaft 22 to rotate clockwise. The rotation of the drive shaft 22 will drive the drive bracket 31 to rotate. The drive bracket 31, through the first connecting rod 34, drives the adjusting seat 33 to slide to the right on the surface of the guide rail 32, thereby adjusting the distance between the two toothed rollers 41. The size of the distance between the toothed rollers 41 can directly affect the particle size of the crushed material. By adjusting the distance between the two toothed rollers 41, the particle size of the lithium mica tailings can be controlled. A suitable crushing particle size can better separate tantalum and niobium from the tailings, which is convenient for subsequent recycling processes. It effectively avoids the problem that if the particle size is too large, tantalum and niobium will be wrapped in the tailings particles and cannot be effectively extracted, or if the particle size is too small, too much fine powder will be generated, which will increase the difficulty and cost of subsequent processing.

[0081] By adjusting the gap between the two toothed rollers 41 using the two adjusting seats 33, the crusher can be put into optimal working condition when crushing lepidolite tailings, reducing the load on the equipment, improving crushing efficiency, processing more tailings in the same amount of time, and increasing the recovery output of tantalum and niobium.

[0082] Third embodiment:

[0083] Please see Figure 1 , Figures 7 to 9The crushing mechanism 4 includes two toothed rollers 41 disposed inside the crushing frame 1. The left toothed roller 41 is rotatably connected to the crushing frame 1, and the right toothed roller 41 is rotatably connected to two adjusting seats 33. The crushing frame 1 has an adjusting groove inside that works with the right toothed roller 41. One end of each of the two toothed rollers 41 is fixed with a transmission wheel 42. A support seat 5 is fixed on the surface of the crushing frame 1. Two drive motors 43 are disposed on the top of the support seat 5. Drive wheels 44 are fixed on the output ends of the two drive motors 43. The two transmission wheels 42 and drive wheels 44 are divided into two groups, front and rear. Multiple transmission belts 45 are sleeved on the surface of each group of transmission wheels 42 and drive wheels 44.

[0084] The bottom of the crushing frame 1 is provided with a screening mechanism 6. The screening mechanism 6 includes a screening frame 61 located at the bottom of the crushing frame 1. An adjusting screen plate 62 is slidably connected to the inner side of the screening frame 61. A fixed screen plate 63 is fixedly provided inside the screening frame 61 and at the bottom of the adjusting screen plate 62. Two adjusting toothed plates 64 are fixedly provided on the right side of the top of the adjusting screen plate 62.

[0085] The mounting bracket 21 is rotatably connected to a rotating shaft 65. Two pulleys 66 are fixed on the surfaces of the rotating shaft 65 and the drive shaft 22, respectively. The four pulleys 66 are divided into two groups, front and rear, and each group of pulleys 66 is fitted with a belt 67. Both ends of the rotating shaft 65 are keyway connected to adjusting gears 68. The two adjusting gears 68 mesh with two adjusting gear plates 64 respectively.

[0086] Please combine Figure 7 Two drive motors 43 are started, which in turn drive two transmission wheels 42 to rotate. Through the transmission belt 45, the drive wheel 44 drives two toothed rollers 41 to rotate. When the lithium mica tailings are put into the crushing frame 1, the two toothed rollers 41 are used to crush the lithium mica tailings.

[0087] Please combine Figure 8 and Figure 9 When the drive shaft 22 rotates clockwise, the pulley 66 and belt 67 drive the bottom rotating shaft 65 to rotate clockwise. The clockwise rotation of the rotating shaft 65 drives the two adjusting gears 68 to rotate clockwise. The clockwise rotation of the two adjusting gears 68 drives the two adjusting toothed plates 64 to move to the left. The leftward movement of the two adjusting toothed plates 64 causes the adjusting screen plate 62 to slide to the left inside the screening frame 61, thereby changing the screening particle size of the material by the screening mechanism 6. When the distance between the two toothed rollers 41 increases, the overlap rate between the adjusting screen plate 62 and the fixed screen plate 63 also increases, thereby increasing the particle size of the material being screened.

[0088] Preferably, the density of the adjustable sieve plate 62 and the fixed sieve plate 63 can be manufactured according to requirements;

[0089] Furthermore, by moving the two adjusting gears 68 to opposite sides on the surface of the rotating shaft 65, the meshing state between the adjusting gears 68 and the adjusting tooth plate 64 can be canceled. Thus, when the drive shaft 22 rotates to adjust the distance between the two toothed rollers 41, the screening particle size of the crushed tailings by the screening mechanism 6 will not change.

[0090] Preferably, before adjusting the position of the right toothed roller 41, the transmission belt 45 on the surface of the right drive wheel 44 needs to be removed, and then the position of the right toothed roller 41 can be adjusted.

[0091] In this embodiment, when the drive shaft 22 rotates clockwise to adjust the crushed particle size of the lepidolite tailings, it drives the rotating shaft 65 to rotate via the pulley 66 and belt 67. The rotation of the rotating shaft 65 drives the two adjusting gears 68 to rotate, and the two adjusting gears 68 then drive the adjusting screen plate 62 to slide to the left inside the screening frame 61 via the adjusting toothed plate 64, thereby adaptively adjusting the screening particle size of the crushed lepidolite tailings. When the gap between the toothed rollers 41 is increased, the drive shaft 22... The pulley 66 drives the rotating shaft 65 to rotate, and the adjusting gear 68 pushes the adjusting toothed plate 64 to move, so that the overlap rate of the adjusting screen plate 62 and the fixed screen plate 63 increases synchronously. Conversely, the gap between the toothed rollers 41 is reduced, and the screening particle size is also reduced synchronously. This can avoid the problem of fine crushing particles being fine but screening particles being coarse, resulting in fine powder being mixed with coarse material and increasing the ineffective energy consumption of the ball mill, or coarse crushing particles being coarse but screening particles being fine, resulting in coarse material being misscreened and tantalum and niobium minerals being lost with fine powder. This ensures that the tailings entering the subsequent ball mill have a uniform particle size.

[0092] Fourth embodiment:

[0093] Please see Figure 2 , Figures 10 to 12 The mounting bracket 21 is vertically rotatably connected to a display mechanism 7. The display mechanism 7 includes a drive screw 71 vertically rotatably connected to the inside of the mounting bracket 21. A screw block 72 is threadedly connected to the surface of the drive screw 71. A display frame 73 is slidably connected to the surface of the screw block 72. A display panel 74 is fixedly mounted on the back of the display frame 73. The top end of the drive screw 71 is rotatably connected to the display frame 73. An indicator frame 75 is fixedly mounted on the right side of the screw block 72. A bevel gear 76 is fixedly mounted on the bottom end of the drive screw 71 and the surface of the drive shaft 22. The two bevel gears 76 mesh with each other.

[0094] The bottom of the display frame 73 is fixedly connected to the top of the mounting frame 21. The surface of the display plate 74 is provided with scale lines. By observing the height position of the indicator frame 75 on the display plate 74, the crushing particle size and the particle size of the lepidolite tailings can be determined.

[0095] The crushing frame 1 has two water pipes 8 connected longitudinally inside, and the surfaces of the two water pipes 8 are connected to multiple atomizing nozzles 9. Two protective baffles 10 are respectively provided on both sides of the inner wall of the crushing frame 1.

[0096] Please combine Figures 10 to 12 When the drive shaft 22 rotates clockwise, it will simultaneously drive the bevel gear 76 on its surface to rotate clockwise. The rotation of the bottom bevel gear 76 drives the drive screw 71 to rotate through the top bevel gear 76. The rotation of the drive screw 71 drives the screw block 72 and the indicator frame 75 to move upward. The movement position of the indicator frame 75 can be observed through the display panel 74.

[0097] Furthermore, the clockwise rotation of the drive shaft 22 will pull the right adjustment seat 33 to the right, increasing the distance between the two toothed rollers 41. At the same time, the rotation of the drive shaft 22 will drive the rotating shaft 65 to rotate clockwise through the pulley 66. Through the cooperation of the adjusting gear 68 and the adjusting toothed plate 64, the adjusting screen plate 62 will move to the left, and the screened particle size will also increase. The distance between the two toothed rollers 41 and the size of the screened particle can be seen intuitively through the height position of the indicator frame 75.

[0098] Preferably, the dust generated during the crushing of lepidolite tailings is treated by setting up the water outlet pipe 8 and the atomizing nozzle 9.

[0099] In this embodiment, when the drive shaft 22 rotates clockwise, it drives the drive screw 71 to rotate through the two bevel gears 76, causing the screw block 72 and the indicator frame 75 to move upward. The movement position of the indicator frame 75 can be observed through the display panel 74, thereby displaying the distance between the two toothed rollers 41 and the size of the screening particle size. This allows the staff to read the current distance between the toothed rollers 41 and the screening particle size in real time, ensuring that each adjustment accurately matches the subsequent process requirements. This avoids insufficient dissociation of tantalum and niobium minerals or over-crushing and loss due to particle size deviation, thereby improving the recovery efficiency of tantalum and niobium metals.

[0100] Please refer to the reference again. Figures 1 to 12 The working principle of the equipment for extracting and recovering tantalum and niobium metal from lepidolite tailings provided by this invention is as follows:

[0101] Step S1: Remove the transmission belt 45 from the surface of the right drive wheel 44 and unscrew the nut on the bolt surface. Then, start the two electric telescopic rods 23. The two electric telescopic rods 23 retract and drive the two drive gear plates 26 to slide to the left on the surface of the slide rail 25. The two drive gear plates 26 move to the left and drive the two drive gears 24 to rotate clockwise. The two drive gears 24 rotate clockwise and drive the drive shaft 22 to rotate clockwise.

[0102] When the drive shaft 22 rotates clockwise, it will simultaneously drive the two drive brackets 31 to rotate clockwise. Through the first connecting rod 34, the two adjusting seats 33 will be pulled to the right, causing the adjusting seats 33 to slide to the right on the surface of the guide rail 32. When the two adjusting seats 33 move to the right, they will drive the right toothed roller 41 to move to the right, thereby adjusting the distance between the two toothed rollers 41.

[0103] In step S2, when the drive shaft 22 rotates clockwise, the pulley 66 and belt 67 simultaneously drive the bottom rotating shaft 65 to rotate clockwise. The clockwise rotation of the rotating shaft 65 drives the two adjusting gears 68 to rotate clockwise. The clockwise rotation of the two adjusting gears 68 drives the two adjusting toothed plates 64 to move to the left. The leftward movement of the two adjusting toothed plates 64 causes the adjusting screen plate 62 to slide to the left inside the screening frame 61, thereby changing the screening particle size of the material by the screening mechanism 6. When the distance between the two toothed rollers 41 increases, the overlap rate between the adjusting screen plate 62 and the fixed screen plate 63 also increases, thus increasing the particle size of the material being screened.

[0104] In step S3, when the drive shaft 22 rotates clockwise, it will simultaneously drive the bevel gear 76 on its surface to rotate clockwise. The rotation of the bottom bevel gear 76 drives the drive screw 71 to rotate through the top bevel gear 76. The rotation of the drive screw 71 drives the screw block 72 and the indicator frame 75 to move upward. The movement position of the indicator frame 75 can be observed through the display panel 74. The position of the indicator frame 75 can display the distance between the two toothed rollers 41 and the size of the screening particle.

[0105] In step S4, after the spacing between the toothed rollers 41 is adjusted, their positions are fixed with nuts. Then, the transmission belt 45 is reinstalled on the right drive wheel 44, and the two drive motors 43 are started. The two drive motors 43 drive the two transmission wheels 42 to rotate. Through the setting of the transmission belt 45, the drive wheel 44 drives the two toothed rollers 41 to rotate. When the lithium mica tailings are put into the crushing frame 1 from the top, the two toothed rollers 41 are used to crush the lithium mica tailings. The crushed tailings are screened by the screening mechanism 6.

[0106] 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 method for extracting and recovering tantalum and niobium metal from lepidolite tailings, characterized in that, Includes the following steps: Step S1: Crush and ball mill the tailings to a certain fineness; Step S2: The tantalum and niobium minerals in the tailings are initially enriched by gravity separation to obtain rough tantalum and niobium concentrate and rough tailings; Step S3: Use high gradient magnetic separation to perform a single scavenging of the roughing tailings to obtain roughing tantalum-niobium concentrate and magnetic tailings; Step S4: After the rough tantalum-niobium concentrate is mixed evenly, it is subjected to a shaking table cleaning process to obtain shaking table tailings I, shaking table middlings I, and tantalum-niobium concentrate I; Step S5: After ball milling the middlings I of the shaking table, perform a shaking table fine cleaning to obtain shaking table tantalum-niobium concentrate I, shaking table middlings II, and shaking table tailings II; Step S6: Perform a shaking table cleaning process on tantalum-niobium concentrate I to obtain high-grade tantalum-niobium concentrate, middlings, and tailings; Step S7: Further process the tantalum-niobium concentrate to recover tantalum-niobium metal; The method for extracting and recovering tantalum and niobium metal from lepidolite tailings employs the following equipment: a crushing frame, a drive mechanism, a particle size adjustment mechanism, and a crushing mechanism. The drive mechanism includes a mounting frame, a drive shaft, and two electric telescopic rods. The left side of the mounting frame is fixed to the right side of the crushing frame. The drive shaft is longitudinally rotatably connected to the inside of the mounting frame. Both ends of the drive shaft are fixed with drive gears. The two electric telescopic rods are respectively fixed to the front and rear sides of the mounting frame. The front and rear sides of the mounting frame are both fixed with slide rails. The surfaces of the two slide rails are slidably connected with drive tooth plates. The two drive tooth plates mesh with the two drive gears respectively. The output ends of the two electric telescopic rods are respectively fixedly connected to the two drive tooth plates. The front and back sides of the mounting frame are both fixed with protective frames. The particle size adjustment mechanism includes a drive bracket, a guide rail, and an adjustment seat. The drive bracket is fixed to the circumferential side of the drive shaft, the guide rail is fixed to the front side of the inner wall of the crushing frame, and the adjustment seat is slidably connected to the guide rail. A first connecting rod is rotatably connected to the surface of the drive bracket, and the left side of the first connecting rod is rotatably connected to the adjustment seat. A rotating seat is rotatably connected to the right side of the inner wall of the crushing frame, and a rotating bracket is rotatably connected inside the rotating seat. A second connecting rod is rotatably connected to the inner side of the rotating bracket, and the second connecting rod is rotatably connected to the adjustment seat. A torsion spring is provided on the surface of the rotating bracket. The crushing mechanism is located inside the crushing frame and is used to crush lithium mica tailings; The bottom of the crushing frame is provided with a screening mechanism, which includes a screening frame located at the bottom of the crushing frame. An adjustable screen plate is slidably connected to the inner side of the screening frame. A fixed screen plate is fixed inside the screening frame and located at the bottom of the adjustable screen plate. Two adjustable toothed plates are fixed on the right side of the top of the adjustable screen plate. The mounting bracket is internally rotatably connected to a rotating shaft. Two pulleys are fixed to the surfaces of the rotating shaft and the drive shaft, respectively. The four pulleys are divided into two groups, front and rear, and each group of pulleys is fitted with a belt. Both ends of the rotating shaft are keyway connected to adjusting gears, and the two adjusting gears mesh with two adjusting gear plates, respectively. The mounting bracket is vertically rotatably connected to a display mechanism. The display mechanism includes a drive screw vertically rotatably connected to the inside of the mounting bracket. A screw block is threadedly connected to the surface of the drive screw. A display frame is slidably connected to the surface of the screw block. A display panel is fixed to the back of the display frame. The top end of the drive screw is rotatably connected to the display frame. An indicator frame is fixed to the right side of the screw block. Bevel gears are fixed to the bottom end of the drive screw and the surface of the drive shaft. The two bevel gears mesh with each other.

2. The method for extracting and recovering tantalum and niobium metal from lepidolite tailings according to claim 1, characterized in that, The particle size adjustment mechanism has two sets arranged in a mirror image to adjust the particle size of the lithium mica tailings. The surface of the adjustment seat is provided with bolts, and the inside of the crushing frame is provided with through holes. The adjustment seat and the crushing frame are connected by bolts and through holes.

3. The method for extracting and recovering tantalum and niobium metal from lepidolite tailings according to claim 1, characterized in that, The crushing mechanism includes two toothed rollers disposed inside the crushing frame. The left toothed roller is rotatably connected to the crushing frame, and the right toothed roller is rotatably connected to two adjusting seats. The crushing frame has an adjusting groove inside that works with the right toothed roller. A transmission wheel is fixedly mounted at one end of each of the two toothed rollers. A support seat is fixedly mounted on the surface of the crushing frame. Two drive motors are mounted on the top of the support seat. A drive wheel is fixedly mounted at the output end of each of the two drive motors. The two transmission wheels and drive wheels are divided into two groups, front and rear. Multiple transmission belts are fitted on the surface of each group of transmission wheels and drive wheels.

4. The method for extracting and recovering tantalum and niobium metal from lepidolite tailings according to claim 1, characterized in that, The bottom of the display frame is fixedly connected to the top of the mounting frame. The surface of the display panel is provided with scale lines. By observing the height position of the indicator frame on the display panel, the crushing particle size and the particle size of the lepidolite tailings can be determined.

5. The method for extracting and recovering tantalum and niobium metal from lepidolite tailings according to claim 1, characterized in that, The crushing frame has two water pipes that are rotatably connected to its interior. The surfaces of the two water pipes are connected to multiple atomizing nozzles. Two protective baffles are respectively installed on both sides of the inner wall of the crushing frame.

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