A recovery device and processing method for recovering rare earth metals from rare earth metal slag

Abstract

The invention relates to the technical field of rare earth metal recovery, and proposes a recovery device and a processing method for recovering rare earth metals from rare earth metal slag, wherein a recovery device for recovering rare earth metals from rare earth metal slag comprises an extraction cylinder, an impact mechanism, a mixing mechanism and a secondary separation mechanism, wherein the two impact mechanisms are arranged opposite to each other, the impact mechanism is used to fully contact the light liquid with the heavy liquid, the mixing mechanism is used to stir the light liquid and the heavy liquid to contact and separate, the secondary separation mechanism is connected with the light liquid outlet and the heavy liquid outlet, and the secondary separation mechanism is used to separate and recover the light liquid and the heavy liquid separated in the extraction cylinder again, wherein the impact mechanism comprises an impact mixing cylinder, and through the above technical scheme, the problem that the light liquid and the heavy liquid in the extraction tower in the prior art are mixed and separated by gravity, the recovery of rare earth elements and the separation of the light liquid and the heavy liquid are insufficient, and the efficiency is low is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of rare earth metal recovery, and in particular to a recovery device and a processing method for recovering rare earth metals from rare earth metal slag. Background Art

[0002] Rare earth elements play a vital role in modern industry due to their unique physical and chemical properties. They are widely used in new energy, new materials, energy conservation and environmental protection, aerospace, electronic information and other fields, and are indispensable elements in modern industry. For example, rare earth elements play an irreplaceable role in the manufacture of high-performance permanent magnetic materials, catalysts, fluorescent materials, laser materials, etc.

[0003] The preparation process of rare earth elements can be roughly divided into the following steps: ore processing, chemical treatment, separation and purification, metallization, post-processing, etc. The metal elements in rare earths are usually extracted by metal thermal reduction or salt electrolysis. After the extraction, some rare earth elements will form rare earth oxides or rare earth molten salt electrolysis slag, etc., and will not be extracted, resulting in a waste of rare earth elements. Therefore, the recovery of rare earth element metal slag is an indispensable step in the extraction of rare earth metals. The process of recovering rare earth metal slag is roughly divided into: pretreatment (baking, grinding, etc.), leaching, separation and purification, etc., among which the separation step is the step of recovering rare earth metal elements in rare earth metal slag.

[0004] The separation of metal elements in rare earth metal slag is mostly carried out by liquid-liquid extraction. The rare earth elements in the pretreated rare earth metal slag will be transferred to water to form a solution during leaching. The mixed solution is mixed with acidic or alkaline chemical reagents in an extraction tower. The solubility difference of different components in two immiscible liquids is used to separate the rare earths. The rare earth elements are integrated into the chemical reagents for easy extraction. Traditional extraction is achieved by using an extraction tower. The solution and chemical reagents are respectively introduced at the upper and lower ends of the extraction tower. The solution and chemical reagents are divided into light liquid and heavy liquid according to their different specific gravities. The two liquids are mixed by gravity and layered according to their different specific gravities. The light liquid is separated from the heavy liquid, and the rare earth elements are extracted after they are collected. However, in traditional extraction towers, the light liquid and the heavy liquid are mixed by gravity, which may cause insufficient contact between the two liquids. At the same time, the two liquids are separated in the extraction tower according to their free upward and downward movement. This method will lead to insufficient separation of the two liquids and low efficiency. It may affect the recovery efficiency when a large amount of rare earth metal slag is continuously recovered. Therefore, we proposed a recovery device and processing method for recovering rare earth metals from rare earth metal slag. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the present invention provides a recovery device and a processing method for recovering rare earth metals from rare earth metal slag, so as to solve the problem proposed in the background technology that in the prior art, light liquid and heavy liquid in the extraction tower are blended and separated by gravity, the recovery of rare earth elements and the separation of light liquid and heavy liquid are insufficient, and the efficiency is low.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A recovery device for recovering rare earth metals from rare earth metal slag, comprising an extraction cylinder, an impact mechanism, a mixing mechanism, a secondary separation mechanism and a liquid supply mechanism, wherein the upper end of the extraction cylinder is provided with a light liquid outlet, the lower end of the extraction cylinder is provided with a heavy liquid outlet, the impact mechanism is arranged at the central position inside the extraction cylinder, the impact mechanism is used to fully contact the light liquid with the heavy liquid, the mixing mechanism is arranged in the extraction cylinder, the mixing mechanism is used to stir the light liquid and the heavy liquid to contact and separate them into layers, the secondary separation mechanism is sleeved on the outer side of the extraction cylinder, the secondary separation mechanism is connected with the light liquid outlet and the heavy liquid outlet, the secondary separation mechanism is used to separate the light liquid and the heavy liquid separated in the extraction cylinder again, wherein the impact mechanism comprises an impact mixing cylinder, the impact mixing cylinder is installed inside the extraction cylinder, and the mixing mechanism runs through the impact mixing cylinder;

[0010] The liquid supply mechanism is installed on the extraction cylinder, and is used to supply light liquid and heavy liquid into the extraction cylinder.

[0011] The impact mechanism further includes a propeller 1, a propeller 2, a delivery pipe and a motor 1, wherein the propeller 1 is rotatably arranged on the extraction cylinder, and the propeller 1 is arranged on one end of the impact mixing cylinder;

[0012] The second propeller is rotatably arranged on the extraction cylinder, the second propeller is arranged on the other end of the impact mixing cylinder, and the first propeller is arranged opposite to the second propeller;

[0013] The delivery pipe is opened in the center of the impact mixing cylinder, and the delivery pipe vertically passes through the impact mixing cylinder;

[0014] The motor 1 is fixedly mounted on the extraction cylinder, and the output end of the motor 1 is connected to the propeller 1.

[0015] The liquid supply mechanism includes a second motor, a light liquid inlet pipe and a heavy liquid inlet pipe. The second motor is fixedly mounted on the extraction cylinder, and the output end of the second motor is connected to the second propeller. The light liquid inlet pipe is fixedly mounted on a side of the extraction cylinder close to the first motor, and the light liquid inlet pipe is communicated with a side of the impact mixing cylinder close to the first propeller. The heavy liquid inlet pipe is fixedly mounted on a side of the extraction cylinder close to the second motor, and the heavy liquid inlet pipe is communicated with a side of the impact mixing cylinder close to the second propeller.

[0016] The mixing mechanism includes a mixing shaft, a motor three, a stirring blade and a fixed blade. The mixing shaft is rotatably arranged in the center of the extraction cylinder. The motor three is installed on the top of the extraction cylinder. The output end of the motor three is connected to the mixing shaft. A plurality of stirring blades are installed on the mixing shaft at equal intervals. A plurality of fixed blades are fixedly installed in the extraction cylinder in a circular shape. The fixed blades are located between the stirring blades.

[0017] The mixing shaft passes through the conveying pipe, and a portion of the mixing shaft in the conveying pipe is provided with opposing spirals.

[0018] The stirring piece and the fixing piece are both arranged on the upper and lower sections of the mixing shaft. The stirring piece is arranged in a semicircular shape and a through hole is provided on the stirring piece.

[0019] The secondary separation mechanism includes a centrifugal cylinder, a rotating track, a waste residue tank and a centrifugal assembly. A through hole is provided in the center of the centrifugal cylinder, and the centrifugal cylinder is sleeved on the extraction cylinder through the through hole. The rotating track is circumferentially arranged on the inner side of the centrifugal cylinder, the waste residue tank is circumferentially arranged on the bottom of the centrifugal cylinder, and the centrifugal assembly is arranged inside the centrifugal cylinder. The centrifugal assembly is used to drive the light liquid and the heavy liquid to rotate and centrifuge for separation.

[0020] The centrifugal assembly comprises:

[0021] A rotating ring, wherein the rotating ring is slidably arranged on the rotating track, a plurality of blades are arranged on the circumference of the rotating ring, a gear ring is arranged on the rotating ring, a motor four is arranged on the centrifugal cylinder, a gear is arranged on the output end of the motor four, and the gear is meshed with the gear ring.

[0022] A connecting hole one is provided on the side of the top of the centrifugal cylinder close to the extraction cylinder, a connecting hole two is provided on the side of the bottom of the centrifugal cylinder away from the extraction cylinder, the light liquid outlet is connected to the connecting hole one, the heavy liquid outlet is connected to the connecting hole two, a heavy liquid separation port is provided on the top of the waste residue tank, and a light liquid separation port is provided on the side of the top of the centrifugal cylinder close to the extraction cylinder.

[0023] A method for recovering rare earth metals from rare earth metal slag, using the above-mentioned recovery device for recovering rare earth metals from rare earth metal slag, comprises the following steps:

[0024] Step 1: Injection of light liquid and heavy liquid: the light liquid is transported to the first propeller through the light liquid inlet pipe, and the heavy liquid is transported to the second propeller through the heavy liquid inlet pipe;

[0025] Step 2, light liquid and heavy liquid impact: start the motor 1 and the motor 2 respectively to drive the propeller 1 and the propeller 2 to rotate respectively, and the light liquid and the heavy liquid move in the impact mixing cylinder driven by the propeller 1 and the propeller 2 respectively, and the light liquid and the heavy liquid impact and mix at the opposite spirals;

[0026] Step 3: conveying the light liquid and the heavy liquid: turning on the motor 3 to drive the mixing shaft to rotate, and the counter-rotating spirals drive the light liquid and the heavy liquid to mix, and convey the mixture to the upper and lower sides through the conveying pipe;

[0027] Step 4: mixing the light liquid and the heavy liquid: turning on the motor 3 to drive the stirring blade to rotate, thereby driving the light liquid and the heavy liquid to mix, and the light liquid and the heavy liquid float up and sink respectively under the action of gravity while mixing;

[0028] Step 5, entering the centrifugal cylinder: the separated light liquid leaves the extraction cylinder through the light liquid outlet, and the separated heavy liquid leaves the extraction cylinder through the heavy liquid outlet, the light liquid enters the inner layer of the centrifugal cylinder, and the heavy liquid enters the outer layer of the centrifugal cylinder;

[0029] Step 6, centrifuging the light liquid and heavy liquid: the motor 4 drives the gear ring to rotate through the gear, and the rotating ring and the blades drive the light liquid and heavy liquid to rotate in the centrifuge cylinder;

[0030] Step 7, separation of light liquid and heavy liquid: the heavy liquid adheres to the bottom and outer wall of the centrifuge cylinder under the action of centrifugal force, the light liquid rotates in the inner layer and top of the centrifuge cylinder under the pressure of the heavy liquid, the light liquid leaves the centrifuge cylinder at the light liquid separation port, the residue in the heavy liquid gathers in the waste residue tank, and the heavy liquid leaves the centrifuge cylinder through the heavy liquid separation port.

[0031] (III) Beneficial effects

[0032] Compared with the prior art, the present invention provides a recovery device and a processing method for recovering rare earth metals from rare earth metal slag, which has the following beneficial effects:

[0033] 1. In the present invention, propeller 1 and propeller 2 are provided to drive the light liquid and the heavy liquid to move respectively. The light liquid and the heavy liquid collide in the impact mixing cylinder. The light liquid and the heavy liquid are fully blended together during the collision. The light liquid and the heavy liquid contact at the same height, which can avoid contact only by gravity. After the light liquid and the heavy liquid are transported to the upper and lower sides through the transport pipe, they can move up and down by the side of the impact mixing cylinder, and perform the first separation in the extraction cylinder;

[0034] 2. In the present invention, a light liquid outlet is arranged to be connected to the side of the top of the centrifugal cylinder close to the extraction cylinder, and a heavy liquid outlet is arranged to be connected to the side of the bottom of the centrifugal cylinder away from the extraction cylinder. The heavy liquid squeezes the waste residue so that the waste residue does not leave the waste residue tank. The heavy liquid can leave through the heavy liquid separation port at the top of the waste residue tank. Under the squeezing of the heavy liquid, the light liquid is at the top of the inner layer of the centrifugal cylinder. When too much light liquid remains in the centrifugal cylinder, the heavy liquid separation port can be closed to continue to inject heavy liquid and light liquid, so that the light liquid is centrifuged to separate the heavy liquid that may be mixed therein, and the light liquid leaves the centrifugal cylinder through the light liquid separation port. The connection between the light liquid outlet and the heavy liquid outlet and the centrifugal cylinder is the gathering place of the light liquid and the heavy liquid, which can reduce the phenomenon of light liquid and heavy liquid mixing again.

[0035] 3. In the present invention, an impact mechanism is provided to allow the light liquid and the heavy liquid to collide, so that the light liquid and the heavy liquid can be mixed more fully, and after the light liquid and the heavy liquid are mixed, they can move a longer distance in the extraction cylinder, thereby further improving the extraction efficiency. By providing a secondary separation mechanism, the light liquid and the heavy liquid are separated for the first time through the extraction cylinder, and then the light liquid and the heavy liquid enter the centrifugal cylinder and are more fully stratified under the action of centrifugal force, thereby improving the collection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure in this application;

[0037] Figure 2 Another perspective structural diagram of the entire application;

[0038] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the extraction cartridge in this application;

[0039] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the impact mixing cylinder in this application;

[0040] Figure 5 This is a schematic diagram of the structure of the impact mechanism and the mixing mechanism in this application;

[0041] Figure 6 This is a schematic diagram of the internal cross-sectional structure of the centrifuge cylinder in this application;

[0042] Figure 7 This is a schematic diagram of the structure of the centrifugal cylinder and the rotating ring in this application;

[0043] Figure 8 This is a schematic diagram of the structure of the rotating ring and the motor four in this application.

[0044] In the figure: 1. extraction cylinder; 2. light liquid outlet; 3. heavy liquid outlet; 4. impact mixing cylinder; 5. propeller one; 6. propeller two; 7. delivery pipe; 8. motor one; 9. motor two; 10. light liquid inlet pipe; 11. heavy liquid inlet pipe; 12. mixing shaft; 13. motor three; 14. stirring plate; 15. fixing plate; 16. opposite spiral; 17. centrifugal cylinder; 18. rotating track; 19. waste residue tank; 20. rotating ring; 21. gear ring; 22. motor four; 23. gear; 24. heavy liquid separation port; 25. light liquid separation port; 26. connecting hole one; 27. connecting hole two. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] For example, see Figures 1 to 8 A recovery device for recovering rare earth metals from rare earth metal slag comprises an extraction cylinder 1, an impact mechanism, a mixing mechanism, a secondary separation mechanism and a liquid supply mechanism. The upper end of the extraction cylinder 1 is provided with a light liquid outlet 2, and the lower end of the extraction cylinder 1 is provided with a heavy liquid outlet 3. The impact mechanism is arranged at the central position of the extraction cylinder 1, and the impact mechanism is used to fully contact the light liquid with the heavy liquid. The mixing mechanism is rotatably arranged in the extraction cylinder 1, and the mixing mechanism is arranged on both sides of the impact mechanism. The mixing mechanism is used to stir the light liquid and the heavy liquid to contact and separate them. The secondary separation mechanism is sleeved on the outer side of the extraction cylinder 1, and the secondary separation mechanism is connected with the light liquid outlet 2 and the heavy liquid outlet 3. The secondary separation mechanism is used to The light liquid and heavy liquid separated in the extraction cylinder 1 are separated again, wherein the impact mechanism includes an impact mixing cylinder 4, which is installed inside the extraction cylinder 1, and the mixing mechanism penetrates the impact mixing cylinder 4, and the light liquid and the heavy liquid collide in the impact mixing cylinder 4, and the light liquid and the heavy liquid are fully blended together during the collision, and the light liquid and the heavy liquid are in contact at the same height, which can avoid contact only by gravity. After the light liquid and the heavy liquid are transported to the upper and lower sides through the conveying pipe 7, they can move up and down through the side of the impact mixing cylinder 4, and perform the first separation in the extraction cylinder 1, and the liquid supply mechanism is installed on the extraction cylinder 1, and the liquid supply mechanism is used to supply light liquid and heavy liquid to the extraction cylinder 1.

[0047] The impact mechanism also includes propeller 1 5, propeller 2 6, motor 1 8 and delivery pipe 7. Propeller 1 5 is rotatably arranged on the extraction cylinder 1. Propeller 1 5 is arranged on one end of the impact mixing cylinder 4. Propeller 2 6 is rotatably arranged on the extraction cylinder 1. Propeller 2 6 is arranged on the other end of the impact mixing cylinder 4. Propeller 1 5 and propeller 2 6 are arranged opposite to each other. The output end of motor 1 8 is connected to propeller 1 5. Motor 2 9 is fixedly installed on the extraction cylinder 1. Delivery pipe 7 is opened in the center of the impact mixing cylinder 4. Delivery pipe 7 vertically penetrates the impact mixing cylinder 4. Propeller 1 5 and propeller 2 6 rotate to push the light liquid and the heavy liquid to collide at the delivery pipe 7. The impact together can make the fusion contact more complete.

[0048] The extraction cylinder 1 is provided with a motor 29, a light liquid inlet pipe 10 and a heavy liquid inlet pipe 11. The motor 18 is fixedly installed on the extraction cylinder 1, and the output end of the motor 29 is connected to the propeller 26. The light liquid inlet pipe 10 is fixedly installed on the side of the extraction cylinder 1 close to the motor 18. The light liquid inlet pipe 10 is connected to the side of the impact mixing cylinder 4 close to the propeller 15. The heavy liquid inlet pipe 11 is fixedly installed on the side of the extraction cylinder 1 close to the motor 29. The heavy liquid inlet pipe 11 is connected to the side of the impact mixing cylinder 4 close to the propeller 26. A plurality of connecting pipes are provided at the connection between the light liquid inlet pipe 10 and the heavy liquid inlet pipe 11 and the inside of the impact mixing cylinder 4, so that the solution fully fills the impact mixing cylinder 4.

[0049] The mixing mechanism includes a mixing shaft 12, a motor 3 13, a stirring blade 14 and a fixed blade 15. The mixing shaft 12 is rotatably arranged in the center of the extraction cylinder 1. The motor 3 13 is installed on the top of the extraction cylinder 1. The output end of the motor 3 13 is connected to the mixing shaft 12. The stirring blades 14 are installed on the mixing shaft 12 at equal intervals. The fixed blade 15 is fixedly installed in the extraction cylinder 1 in a circular ring shape. The fixed blade 15 is located between the stirring blades 14. The mixing shaft 12 passes through the conveying pipe 7. The portion of the mixing shaft 12 in the conveying pipe 7 is provided with a counter-rotating spiral 16. The stirring blade 14 and the fixed blade 15 are both arranged at On both sides of the impact mixing shaft 12, the stirring blades 14 are arranged in a semicircular shape, and through holes are opened on the stirring blades 14. Multiple stirring blades 14 are arranged in a semicircular shape, and the arc surfaces of the multiple stirring blades 14 are arranged in an alternating manner. When the stirring blades 14 rotate between the fixed plates 15, the light liquid and the heavy liquid can be driven to contact and fuse with each other, so that the rare earth elements in the solution can be better extracted. After that, the light liquid and the heavy liquid rise and fall according to their respective weights. At the same time, the multiple through holes on the stirring blades 14 can enhance the stirring and mixing effect of the light liquid and the heavy liquid, and can also increase the rising and falling movement speed of the liquid in the extraction cylinder 1.

[0050] The secondary separation mechanism includes a centrifugal cylinder 17, a rotating track 18, a waste residue tank 19 and a centrifugal assembly. A through hole is provided in the center of the centrifugal cylinder 17. The centrifugal cylinder 17 is sleeved on the extraction cylinder 1 through the through hole. The rotating track 18 is circumferentially provided inside the centrifugal cylinder 17. The waste residue tank 19 is circumferentially provided at the bottom of the centrifugal cylinder 17. The centrifugal assembly is provided inside the centrifugal cylinder 17. The centrifugal assembly is used to drive the light liquid and the heavy liquid to rotate and centrifuge for separation. The centrifugal assembly includes a rotating ring 20. The rotating track 18 is slidably provided with a rotating ring 20. The rotating ring 20 is circumferentially provided on the rotating ring 20. A plurality of paddles are provided, a gear ring 21 is provided on the rotating ring 20, a motor 22 is provided on the centrifugal cylinder 17, a gear 23 is provided on the output end of the motor 22, the gear 23 is meshed with the gear ring 21, the light liquid and the heavy liquid separated by the extraction cylinder 1 are mixed again in the centrifugal cylinder 17, and rotate under the drive of the paddles, the motor 22 drives the gear ring 21 to rotate on the rotating track 18 through the gear 23, the paddles drive the light liquid and the heavy liquid to rotate, and the waste residue moves to the waste residue groove 19 at the bottom edge of the centrifugal cylinder 17 under the action of centrifugal force.

[0051] A connecting hole 126 is provided on the top of the centrifuge cylinder 17 near the extraction cylinder 1, a connecting hole 27 is provided on the bottom of the centrifuge cylinder 17 away from the extraction cylinder 1, the light liquid outlet 2 is connected to the connecting hole 126, the heavy liquid outlet 3 is connected to the connecting hole 227, a heavy liquid separation port 24 is provided on the top of the waste residue tank 19, and a light liquid separation port 25 is provided on the top of the centrifuge cylinder 17 near the extraction cylinder 1. Under the pressure of the heavy liquid, the light liquid is at the top of the inner layer of the centrifuge cylinder 17. When there is too much light liquid in the centrifuge cylinder 17, the heavy liquid separation port 24 can be closed to continue to inject heavy liquid and light liquid, so that the light liquid is separated from the heavy liquid that may be mixed therein after centrifugation, and the light liquid leaves the centrifuge cylinder 17 through the light liquid separation port 25. The connection between the light liquid outlet 2 and the heavy liquid outlet 3 and the centrifuge cylinder 17 is the gathering place of the light liquid and the heavy liquid, which can reduce the phenomenon of light liquid and heavy liquid mixing again.

[0052] In this embodiment, after the light liquid and the heavy liquid enter the impact mixing barrel 4, they are pushed by the propeller 1 5 and the propeller 2 6 to impact and mix with each other in the conveying pipe. Compared with the traditional light liquid and heavy liquid intersecting and mixing by gravity, the impact mixing is more complete. The opposite spirals 16 in the conveying pipe 7 discharge the mixed light liquid and heavy liquid to the upper and lower sides. After that, the light liquid and heavy liquid mixed liquid continues to be stirred by the stirring plate 14 and the fixing plate 15 and is separated under the action of gravity. The light liquid in the extraction cylinder 1 is The floating heavy liquid sinks, the light liquid enters the centrifuge cylinder 17 at the upper side through the light liquid outlet 2, and the heavy liquid enters the centrifuge cylinder 17 at the lower side through the heavy liquid outlet 3. Then the rotating ring 20 drives the light liquid and the heavy liquid to rotate in the centrifuge cylinder 17 through the blades. Under the action of centrifugal force, the light liquid and the heavy liquid continue to separate, making the separation of the light liquid and the heavy liquid more complete. Then the light liquid leaves the centrifuge cylinder 17 at the light liquid separation port 25 on the centrifuge cylinder 17, and the heavy liquid leaves the centrifuge cylinder 17 at the heavy liquid separation port 24 on the centrifuge cylinder 17.

[0053] Embodiment 2: Embodiment 2 of the present application is supplemented on the basis of Embodiment 1 and is a method for recovering rare earth metals from rare earth metal slag:

[0054] Injection of light liquid and heavy liquid: the light liquid is evenly transported to propeller one 5 through the light liquid inlet pipe 10 and the multiple outlets connected to the impact mixing cylinder 4, and the heavy liquid is evenly transported to propeller two 6 through the heavy liquid inlet pipe 11 and the multiple outlets connected to the impact mixing cylinder 4.

[0055] Impact of light liquid and heavy liquid: start motor 1 8 and motor 2 9, and drive propeller 1 5 and propeller 2 6 to rotate respectively. The light liquid and the heavy liquid move in the impact mixing cylinder 4 driven by propeller 1 5 and propeller 2 6 respectively. The light liquid and the heavy liquid are impacted and mixed at the opposite spiral 16. The light liquid and the heavy liquid are more fully mixed after the impact, and the light liquid and the heavy liquid are rotated and mixed more fully under the drive of the opposite spiral 16.

[0056] Transporting light liquid and heavy liquid: Start the motor 3 13 to drive the mixing shaft 12 to rotate, the mixing shaft 12 drives the opposite screw 16 to rotate, the reverse threads on both sides of the opposite screw 16 drive the light liquid and the heavy liquid to rotate and mix, and transport the mixture of the light liquid and the heavy liquid to the upper and lower sides through the conveying pipe 7.

[0057] Mixing of light liquid and heavy liquid: Motor three 13 drives the stirring blade 14 to rotate through the mixing shaft 12, thereby driving the light liquid and heavy liquid to mix. While the light liquid and heavy liquid are stirred and mixed by the stirring blade 14, they float up and sink respectively under the action of gravity, and the light liquid and heavy liquid are separated. When the light liquid at the lower part of the extraction cylinder 1 floats upward, it passes through the gap between the impact mixing cylinder 4 and the inner wall of the extraction cylinder 1 and enters the light liquid outlet 2. When the light liquid at the upper part of the extraction cylinder 1 sinks, it passes through the gap between the impact mixing cylinder 4 and the inner wall of the extraction cylinder 1 and enters the heavy liquid outlet 3.

[0058] Entering the centrifugal cylinder 17: the separated light liquid floats toward the top of the extraction cylinder 1 and leaves the extraction cylinder 1 through the light liquid outlet 2; the separated heavy liquid sinks in the extraction cylinder 1 and leaves the extraction cylinder 1 through the heavy liquid outlet 3; the light liquid enters the inner layer of the centrifugal cylinder 17 along the light liquid outlet 2, and the heavy liquid enters the outer layer of the centrifugal cylinder 17 along the heavy liquid outlet 3.

[0059] Centrifugation of light liquid and heavy liquid: Start the motor 22 to drive the gear ring 21 to rotate through the gear 23, and the rotating ring 20 and the blades drive the light liquid and the heavy liquid to rotate in the centrifuge cylinder 17. During the rotation, the direction of centrifugation of the light liquid and the heavy liquid is toward the outer and lower part of the centrifuge cylinder 17.

[0060] Separation of light liquid and heavy liquid: The heavy liquid adheres to the bottom and outer wall of the centrifuge cylinder 17 under the action of centrifugal force, and the light liquid rotates in the inner layer and top of the centrifuge cylinder 17 under the pressure of the heavy liquid. As the heavy liquid and the light liquid are continuously injected into the centrifuge cylinder 17, the light liquid leaves the centrifuge cylinder 17 at the light liquid separation port 25, the residue in the heavy liquid gathers in the waste residue tank 19, and the heavy liquid leaves the centrifuge cylinder 17 through the heavy liquid separation port 24.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A recovery device for recovering rare earth metals from rare earth metal slag, characterized in that: include: An extraction cylinder (1), wherein the upper end of the extraction cylinder (1) is provided with a light liquid outlet (2), and the lower end of the extraction cylinder (1) is provided with a heavy liquid outlet (3); An impact mechanism, the impact mechanism being arranged at a central position inside the extraction cylinder (1), and being used to bring the light liquid into full contact with the heavy liquid; A mixing mechanism, the mixing mechanism being arranged in the extraction cylinder (1), the mixing mechanism being used to stir the light liquid and the heavy liquid to contact and separate into layers; A secondary separation mechanism, the secondary separation mechanism being sleeved on the outside of the extraction cylinder (1), the secondary separation mechanism being connected to the light liquid outlet (2) and the heavy liquid outlet (3), and the secondary separation mechanism being used to re-separate the light liquid and the heavy liquid separated in the extraction cylinder (1); A liquid supply mechanism, the liquid supply mechanism being mounted on the extraction cylinder (1), the liquid supply mechanism being used to supply light liquid and heavy liquid into the extraction cylinder (1); The impact mechanism comprises: An impact mixing cylinder (4), the impact mixing cylinder (4) being installed inside the extraction cylinder (1), and the mixing mechanism passing through the impact mixing cylinder (4); Propeller 1 (5), the propeller 1 (5) being rotatably disposed on the extraction cylinder (1), the propeller 1 (5) being disposed on one end of the impact mixing cylinder (4); Propeller 2 (6), the propeller 2 (6) being rotatably disposed on the extraction cylinder (1), the propeller 2 (6) being disposed on the other end of the impact mixing cylinder (4), the propeller 1 (5) being disposed opposite to the propeller 2 (6); A delivery pipe (7), the delivery pipe (7) being opened at the center of the impact mixing cylinder (4), and the delivery pipe (7) vertically passing through the impact mixing cylinder (4); Motor 1 (8), the motor 1 (8) is fixedly mounted on the extraction cylinder (1), and the output end of the motor 1 (8) is connected to the propeller 1 (5); The mixing mechanism comprises: A mixing shaft (12), the mixing shaft (12) being rotatably disposed in the center of the extraction cylinder (1); Motor three (13), the motor three (13) is installed on the top of the extraction cylinder (1), and the output end of the motor three (13) is connected to the mixing shaft (12); A stirring blade (14), wherein a plurality of the stirring blades (14) are installed at equal intervals on the mixing shaft (12); A fixing plate (15), wherein a plurality of the fixing plates (15) are fixedly mounted in a circular ring shape inside the extraction cylinder (1), and the fixing plates (15) are located between the stirring plates (14).

2. The device for recovering rare earth metals from rare earth metal slag according to claim 1, characterized in that: The liquid supply mechanism comprises: Motor 2 (9), the motor 2 (9) is fixedly mounted on the extraction cylinder (1), and the output end of the motor 2 (9) is connected to the propeller 2 (6); a light liquid inlet pipe (10), the light liquid inlet pipe (10) being fixedly mounted on a side of the extraction cylinder (1) close to the motor one (8), the light liquid inlet pipe (10) being connected to a side of the impact mixing cylinder (4) close to the propeller one (5); A heavy liquid inlet pipe (11), the heavy liquid inlet pipe (11) is fixedly mounted on a side of the extraction cylinder (1) close to the second motor (9), and the heavy liquid inlet pipe (11) is connected to a side of the impact mixing cylinder (4) close to the second propeller (6).

3. The device for recovering rare earth metals from rare earth metal slag according to claim 2, characterized in that: The mixing shaft (12) passes through the conveying pipe (7), and the portion of the mixing shaft (12) located in the conveying pipe (7) is provided with opposing spirals (16).

4. The device for recovering rare earth metals from rare earth metal slag according to claim 3, characterized in that: The stirring piece (14) and the fixing piece (15) are both arranged on the upper and lower sections of the mixing shaft (12); the stirring piece (14) is arranged in a semicircular shape; and a through hole is provided on the stirring piece (14).

5. The device for recovering rare earth metals from rare earth metal slag according to claim 4, characterized in that: The secondary separation mechanism comprises: A centrifugal cylinder (17), wherein a through hole is provided at the center of the centrifugal cylinder, and the centrifugal cylinder (17) is sleeved on the extraction cylinder (1) through the through hole; a rotating track (18), the rotating track (18) being arranged in a circular shape inside the centrifugal cylinder (17); A waste residue tank (19), the waste residue tank (19) being arranged in a circular shape at the bottom of the centrifugal cylinder (17); A centrifugal assembly is arranged inside the centrifugal cylinder (17), and is used to drive the light liquid and the heavy liquid to rotate and centrifuge for separation.

6. The device for recovering rare earth metals from rare earth metal slag according to claim 5, characterized in that: The centrifugal assembly comprises: A rotating ring (20), the rotating ring (20) being slidably arranged on the rotating track (18), a plurality of blades being arranged on the circumference of the rotating ring (20), a gear ring (21) being arranged on the rotating ring (20), a motor four (22) being arranged on the centrifugal cylinder (17), a gear (23) being arranged on the output end of the motor four (22), and the gear (23) being meshed with the gear ring (21).

7. The device for recovering rare earth metals from rare earth metal slag according to claim 6, characterized in that: A first connection hole (26) is provided on the top of the centrifugal cylinder (17) on a side close to the extraction cylinder (1), a second connection hole (27) is provided on the bottom of the centrifugal cylinder (17) on a side away from the extraction cylinder (1), the light liquid outlet (2) is connected to the first connection hole (26), the heavy liquid outlet (3) is connected to the second connection hole (27), a heavy liquid separation port (24) is provided on the top of the waste residue tank (19), and a light liquid separation port (25) is provided on the top of the centrifugal cylinder (17) on a side close to the extraction cylinder (1).

8. A method for recovering rare earth metals from rare earth metal slag, using the device for recovering rare earth metals from rare earth metal slag according to claim 7, characterized in that: The following steps are involved: S1. Injection of light liquid and heavy liquid: the light liquid is transported to the first propeller (5) through the light liquid inlet pipe (10), and the heavy liquid is transported to the second propeller (6) through the heavy liquid inlet pipe (11); S2, light liquid and heavy liquid impact: the motor 1 (8) and the motor 2 (9) are turned on respectively to drive the propeller 1 (5) and the propeller 2 (6) to rotate respectively, and the light liquid and the heavy liquid are moved in the impact mixing cylinder (4) driven by the propeller 1 (5) and the propeller 2 (6) respectively, and the light liquid and the heavy liquid are impacted and mixed at the opposite spirals (16); S3, light liquid and heavy liquid transportation: turning on the motor 3 (13) to drive the mixing shaft (12) to rotate, and the opposing spirals (16) to drive the light liquid and the heavy liquid to mix, and transport them to the upper and lower sides through the transport pipe (7); S4, mixing the light liquid and the heavy liquid: turning on the motor 3 (13) to drive the stirring blade (14) to rotate, thereby driving the light liquid and the heavy liquid to mix, and the light liquid and the heavy liquid float up and sink respectively under the action of gravity while mixing; S5, entering the centrifugal cylinder (17): the separated light liquid leaves the extraction cylinder (1) through the light liquid outlet (2), and the separated heavy liquid leaves the extraction cylinder (1) through the heavy liquid outlet (3), the light liquid enters the inner layer of the centrifugal cylinder (17), and the heavy liquid enters the outer layer of the centrifugal cylinder (17); S6, centrifugation of light liquid and heavy liquid: the motor 4 (22) drives the gear ring (21) to rotate through the gear (23), and the rotating ring (20) and the blades drive the light liquid and the heavy liquid to rotate in the centrifuge cylinder (17); S7, separation of light liquid and heavy liquid: the heavy liquid adheres to the bottom and outer wall of the centrifuge cylinder (17) under the action of centrifugal force, and the light liquid rotates in the inner layer and top of the centrifuge cylinder (17) under the pressure of the heavy liquid. The light liquid leaves the centrifuge cylinder (17) at the light liquid separation port (25), and the residue in the heavy liquid gathers in the waste residue tank (19). The heavy liquid leaves the centrifuge cylinder (17) through the heavy liquid separation port (24).

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