Size mixing device for recycling neodymium iron boron waste

Abstract

The slurry mixing device comprises a slurry mixing tank, an auxiliary grinding device, a circulating disturbance device and a temperature control device, the left side of the top end of the slurry mixing tank communicates with a feeding hopper, and a motor is fixedly connected to the center of the top end of the slurry mixing tank; the tail end of a main shaft of the motor is fixedly connected with a stirring shaft rotationally connected with the size mixing tank, the stirring shaft drives an inclined plate on a rotating disc to rotate to generate powerful axial upward flow, materials settled at the deepest position of the tank bottom are forcibly lifted, and the materials continuously enter a main cycle and are conveyed to a grinding area, so that stirring dead angles can be eliminated, and the grinding efficiency is improved. Meanwhile, upwelling at the bottom is combined with grinding and filtering at the upper part, so that the materials are forced to be subjected to the processes of sorting, crushing and recycling for multiple times, micro aggregates with pseudo uniformity can be forcibly destroyed, rare earth particles are fully dissociated and exposed, and the rare earth recovery efficiency is greatly improved. And necessary conditions are created for subsequent efficient leaching.

Description

Technical Field

[0001] This invention relates to the field of NdFeB waste recycling technology, and particularly to a slurry preparation device for NdFeB waste recycling. Background Technology

[0002] Neodymium iron boron (NdFeB) permanent magnet materials, often referred to as "industrial MSG," are widely used in key fields such as wind power, new energy vehicles, and variable frequency home appliances. The waste generated during their production, including sludge, scraps, and defective products, is rich in high-value rare earth elements such as neodymium, praseodymium, and dysprosium. Therefore, efficient recycling of these wastes is crucial for ensuring the supply of strategic resources and promoting the development of a circular economy. Hydrometallurgy is currently the mainstream process for recycling NdFeB waste. Its primary and crucial step is slurry preparation—thoroughly mixing the waste with a specific leaching acid in a slurry preparation device to break down the oxide layer and binding phase on the particle surface, fully exposing the rare earth particles and creating the necessary conditions for subsequent efficient chemical leaching. However, existing slurry preparation devices exhibit several technical bottlenecks when dealing with the high density, easy caking, and uneven particle size distribution of NdFeB waste. Firstly, there are issues with uneven mixing and dead zones at the bottom. Problem: When traditional agitators (such as paddle and turbine agitators) are in operation, the bottom of the tank, especially the central shaft area, is prone to forming a stirring blind zone. High-density rare earth materials settle and continuously agglomerate here, which not only prevents some materials from participating in the circulation and significantly reduces the recovery rate, but also greatly increases the starting and running torque of the agitator shaft, resulting in high energy consumption and even damage to the equipment. Secondly, there is the more troublesome problem of "pseudo-uniformity" and micro-agglomeration: Although macro-stirring can make the slurry visually uniform, there are still a large number of stable agglomerates formed by fine particles, oil stains and magnetic adsorption at the micro level. The internal core of these agglomerates is not effectively wetted and broken by the solvent, forming a "protective shell" in the subsequent leaching process, which seriously hinders the mass transfer process, resulting in incomplete rare earth recovery, prolonged leaching cycle and excessive consumption of chemical reagents. Therefore, a slurry preparation device for NdFeB waste recycling is proposed to address the above problems. Summary of the Invention

[0003] The technical problem to be solved by the present invention overcomes the defects of the existing technology and can effectively solve the problems in the background technology.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A slurry preparation device for recycling NdFeB waste includes a slurry preparation tank, an auxiliary grinding device, a circulation agitation device, and a temperature control device. A feed hopper is connected to the top left side of the slurry preparation tank. A motor is fixedly connected to the center of the top of the slurry preparation tank. A stirring shaft, rotatably connected to the slurry preparation tank, is fixedly connected to the end of the motor's main shaft. A stirring rod is fixedly connected to the outside of the stirring shaft. An auxiliary grinding device is provided inside the stirring rod. A circulation agitation device is provided at the bottom outside of the stirring shaft. A temperature control device is provided at one end of the outside of the slurry preparation tank. A discharge pipe with a valve fixedly connected inside is connected to the bottom right side of the slurry preparation tank. A controller is fixedly connected to the top front end of the slurry preparation tank. An inspection door is provided at the bottom of the controller, and the inspection door is connected to the slurry preparation tank via a sealing hinge.

[0006] As a further improvement of the present invention, the auxiliary grinding device includes a heat-conducting cylinder. The heat-conducting cylinder is provided inside the stirring rod. The outer side of the heat-conducting cylinder is connected by bolts to uniformly distributed moving grinding blocks. A fixed seat is slidably limited at the top of the inner side of the stirring rod. A stationary grinding block is connected to the bottom of the fixed seat by bolts. Both the moving grinding block and the stationary grinding block are made of carbide alloy. The outer sides of both the moving grinding block and the stationary grinding block are provided with radial straight ridges. The radial straight ridges on the outer sides of the moving grinding block and the stationary grinding block are staggered. The gap between the moving grinding block and the stationary grinding block is gradually narrowed. One end of the heat-conducting cylinder is sealed and connected to a first fixed tube that penetrates the stirring rod. The first fixed tube can rotate with the stirring rod. The other end of the heat-conducting cylinder is sealed and connected to a second fixed tube that penetrates the stirring rod and the stirring shaft. The second fixed tube can rotate with the stirring rod and the stirring shaft.

[0007] As a further improvement of the present invention, a first spring is fixedly connected to the top of the fixed base, and the other end of the first spring is fixedly connected to the stirring rod.

[0008] As a further improvement of the present invention, a small bevel gear located inside the stirring shaft is fixedly connected to one end of the outer side of the second fixed tube, and a large bevel gear located inside the stirring shaft is meshed with the outer side of the small bevel gear.

[0009] As a further improvement of the present invention, an inclined guide filter is fixedly connected to one end of the outer side of the stirring rod, and the guide filter is symmetrically distributed on the outer side of the stirring rod. The filter holes of the guide filter are arranged in an elongated shape, and the cross-sectional view of the filter holes of the guide filter is arranged in an isosceles trapezoidal shape. The guide filter is made of polyurethane material.

[0010] As a further improvement of the present invention, a cam located inside the stirring rod is fixedly connected to one end of the outer side of the first fixed tube and the other end of the outer side of the second fixed tube. A push block is in contact with the outer side of the cam. A limiting frame that slides on the inner side of the stirring rod is fixedly connected to the outer side of the push block. A second spring is fixedly connected to one side of the limiting frame, and the other end of the second spring is fixedly connected to the stirring rod. A fixing frame penetrating the stirring rod is fixedly connected to both the upper and lower ends of the limiting frame, and the fixing frame can slide back and forth with the stirring rod. A uniformly distributed fixing shaft is fixedly connected to one end of the outer side of the fixing frame, and a ball is fixedly connected to the other end of the fixing shaft.

[0011] As a further improvement of the present invention, the circulating disturbance device includes a turntable, the bottom of the outer side of the stirring shaft is fixedly connected to the turntable which is rotatably connected to the mixing tank, and the top of the turntable is fixedly connected to a ring of uniformly distributed inclined plates.

[0012] As a further improvement of the present invention, the temperature control device includes a constant temperature circulator. A constant temperature circulator is provided at one end of the outer side of the mixing tank. The inlet end of the constant temperature circulator is connected to a return pipe, and the other end of the return pipe is connected to the mixing tank. A rotating sleeve is rotatably and sealed at the inner edge of the mixing tank, and the rotating sleeve is fixedly connected to a stirring rod. The rotating sleeve is sealed and connected to a first fixed pipe in the auxiliary grinding device, and the first fixed pipe can rotate with the rotating sleeve. The outlet end of the constant temperature circulator is connected to an outlet pipe penetrating the mixing tank, and the outlet pipe is fixedly connected to the mixing tank. The other end of the outlet pipe is connected to a fixed pipe that penetrates the mixing tank, and the fixed pipe is inserted into the inside of the stirring shaft. The fixed pipe passes through the large bevel gear in the auxiliary grinding device, and the fixed pipe is fixedly connected to the mixing tank and the large bevel gear in the auxiliary grinding device. A rotating sleeve is rotatably connected to the outside of the fixed pipe, and the part of the fixed pipe located inside the rotating sleeve has evenly distributed through holes on its outer side. The fixed pipe is rotatably connected to the stirring shaft. The second fixed pipe in the auxiliary grinding device is sealed and connected to the rotating sleeve, and the second fixed pipe in the auxiliary grinding device can rotate with the rotating sleeve.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The stirring shaft drives the inclined plate on the turntable to rotate, generating a powerful axial upward flow that forcibly lifts the material settled at the deepest part of the tank bottom, allowing it to continuously enter the main circulation and be transported to the grinding zone. This eliminates dead zones in the stirring process and ensures that the material in the tank participates in the circulation throughout the entire area, greatly improving the uniformity and total recovery rate of rare earth recovery. At the same time, the bottom upward flow combined with the upper grinding and filtration forces the material to undergo the "sorting-crushing-recirculation" process multiple times, which can strongly destroy the "pseudo-uniform" micro-agglomerates, allowing the rare earth particles to be fully dissociated and exposed, creating the necessary conditions for subsequent efficient leaching. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0016] Figure 1 This is a schematic diagram of the overall structure of a slurry preparation device for recycling neodymium iron boron waste according to the present invention.

[0017] Figure 2 This is a cross-sectional structural schematic diagram of the slurry preparation tank of a slurry preparation device for recycling neodymium iron boron waste according to the present invention.

[0018] Figure 3 This is a cross-sectional structural schematic diagram of the stirring shaft of a slurry preparation device for recycling neodymium iron boron waste according to the present invention.

[0019] Figure 4 This is a cross-sectional structural schematic diagram of the fixed pipe of a slurry preparation device for recycling neodymium iron boron waste according to the present invention.

[0020] Figure 5 This is a schematic diagram of the overall structure of the left stirring shaft of a slurry preparation device for recycling neodymium iron boron waste according to the present invention.

[0021] Figure 6 This is a schematic diagram of the installation structure of the limiting frame of the slurry preparation device for recycling neodymium iron boron waste according to the present invention.

[0022] Figure 7 This is a schematic diagram of the installation structure of the moving grinding block in a slurry preparation device for recycling neodymium iron boron waste according to the present invention.

[0023] Figure 8 This is a schematic diagram of the installation structure of the static grinding block of a slurry preparation device for recycling neodymium iron boron waste according to the present invention.

[0024] Figure 9 This is a cross-sectional view of the heat-conducting cylinder and fixing base of a slurry preparation device for recycling neodymium iron boron waste according to the present invention.

[0025] Figure 10 This is a cross-sectional view of the guide filter screen of a slurry preparation device for recycling neodymium iron boron waste according to the present invention.

[0026] In the diagram: 1. Slurry mixing tank; 2. Feed hopper; 3. Motor; 4. Stirring shaft; 5. Stirring rod; 6. Auxiliary grinding device; 601. Heat-conducting cylinder; 602. Moving grinding block; 603. Fixed base; 604. Static grinding block; 605. First spring; 606. First fixed tube; 607. Second fixed tube; 608. Small bevel gear; 609. Large bevel gear; 610. Guide filter screen; 611. Cam; 612. 613. Push block; 614. Limiting frame; 615. Second spring; 616. Fixing frame; 617. Fixing shaft; 618. Ball block; 7. Circulating disturbance device; 701. Turntable; 702. Inclined plate; 8. Temperature control device; 801. Thermostatic circulator; 802. Return pipe; 803. Rotating sleeve; 804. Liquid outlet pipe; 805. Fixing pipe; 806. Rotating sleeve; 9. Discharge pipe; 10. Controller; 11. Inspection door. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the specific embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. All parts involving precision gear structures and rotating structures are provided with protective structures and sealing mechanisms, which will not be repeated in this application. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. All other specific embodiments obtained by those skilled in the art based on the specific embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] like Figure 1-10 As shown, a slurry preparation device for recycling NdFeB waste includes a slurry preparation tank 1, an auxiliary grinding device 6, a circulation disturbance device 7, and a temperature control device 8. A feed hopper 2 is connected to the left side of the top of the slurry preparation tank 1. A motor 3 is fixedly connected to the center of the top of the slurry preparation tank 1. A stirring shaft 4, rotatably connected to the end of the main shaft of the motor 3, is fixedly connected to the end of the stirring shaft 4. A stirring rod 5 is fixedly connected to the outside of the stirring shaft 4. The auxiliary grinding device 6 is provided inside the stirring rod 5. The circulation disturbance device 7 is provided at the bottom of the outside of the stirring shaft 4. A temperature control device 8 is provided at one end of the outside of the slurry preparation tank 1. A discharge pipe 9, with a valve fixedly connected inside, is connected to the bottom right side of the slurry preparation tank 1. A controller 10 is fixedly connected to the top of the front end of the slurry preparation tank 1. An inspection door 11 is provided at the bottom of the controller 10, and the inspection door 11 is connected to the slurry preparation tank 1 by a sealing hinge.

[0030] Furthermore, such as Figure 2-9As shown, to address the problem of difficulty in breaking up micro-agglomerated materials during slurry preparation, the auxiliary grinding device 6 includes a heat-conducting cylinder 601. The heat-conducting cylinder 601 is located inside the stirring rod 5. Uniformly distributed moving grinding blocks 602 are bolted to the outside of the heat-conducting cylinder 601. A fixed seat 603 is slidably positioned at the top of the inner side of the stirring rod 5. A stationary grinding block 604 is bolted to the bottom of the fixed seat 603. Both the moving grinding block 602 and the stationary grinding block 604 are made of carbide alloy. Radial straight ridges are provided on the outer sides of both the moving grinding block 602 and the stationary grinding block 604, and these ridges are staggered. The gap between the grinding blocks 604 is gradually narrowed. One end of the heat-conducting cylinder 601 is sealed and connected to a first fixed tube 606 that passes through the stirring rod 5, and the first fixed tube 606 can rotate with the stirring rod 5. The other end of the heat-conducting cylinder 601 is sealed and connected to a second fixed tube 607 that passes through the stirring rod 5 and the stirring shaft 4, and the second fixed tube 607 can rotate with the stirring rod 5 and the stirring shaft 4. During the slurry preparation process, the heat-conducting cylinder 601 drives the rotating grinding block 602 with radial straight ridges on the outside to rotate, and then works with the stationary grinding block 604 with radial straight ridges on the outside to continuously grind the material that has entered between the two after classification, which facilitates the breaking down of micro-agglomerated materials during the slurry preparation process, so that rare earth particles can be fully dissociated and exposed.

[0031] Furthermore, such as Figure 8 As shown, in order to solve the problem of not being able to buffer rigid collisions when indestructible rigid foreign objects are mixed in during the grinding of micro-agglomerates or grinding materials, a first spring 605 is fixedly connected to the top of the fixed base 603, and the other end of the first spring 605 is fixedly connected to the stirring rod 5. When indestructible rigid foreign objects are mixed in during the grinding of micro-agglomerates or grinding materials, the first spring 605 is compressed upward by the static grinding block 604, which further buffers the grinding operation and can prevent rigid collisions.

[0032] Furthermore, such as Figure 3-7 As shown, in order to solve the problem of inconvenience in driving the moving grinding block 602 on the outside of the heat-conducting cylinder 601 during the slurry preparation process, a small bevel gear 608 located inside the stirring shaft 4 is fixedly connected to one end of the outer side of the second fixed tube 607. The small bevel gear 608 is meshed with a large bevel gear 609 located inside the stirring shaft 4. During the process of the stirring rod 5 on the outside of the stirring shaft 4 driven by the motor 3 to rotate, and further carrying out the slurry preparation operation, the small bevel gear 608 is simultaneously controlled to rotate around the large bevel gear 609 through the stirring rod 5. When the small bevel gear 608 drives the second fixed tube 607 to rotate, it is convenient to drive the moving grinding block 602 on the outside of the heat-conducting cylinder 601 through the second fixed tube 607 at the same time.

[0033] Furthermore, such as Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 10 As shown, to address the problem of inconvenient material grading during the slurry preparation process, an inclined guide filter 610 is fixedly connected to one end of the outer side of the stirring rod 5. The guide filter 610 is symmetrically distributed on the outer side of the stirring rod 5, and the filter holes of the guide filter 610 are elongated. The guide filter 610 is made of polyurethane, and the cross-sectional view of the filter holes of the guide filter 610 is an isosceles trapezoidal shape. During the slurry preparation process, the stirring rod 5 simultaneously drives the symmetrically distributed guide filter 610 to rotate. When materials that meet the particle size requirements pass through the guide filter 610, and agglomerated materials that do not meet the particle size requirements are filtered by the filter 610, it is convenient to grade the materials during the slurry preparation process.

[0034] Furthermore, such as Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9As shown, to address the issue of clogging the guide filter 610 during material grading, a cam 611 located inside the stirring rod 5 is fixedly connected to one end of the outer side of the first fixed tube 606 and the other end of the outer side of the second fixed tube 607. A push block 612 contacts the outer side of the cam 611. A limiting frame 613, which slides within the stirring rod 5, is fixedly connected to the outer side of the push block 612. A second spring 614 is fixedly connected to one side of the limiting frame 613, and the other end of the second spring 614 is fixedly connected to the stirring rod 5. Fixed frames 615 penetrating the stirring rod 5 are fixedly connected to both the upper and lower ends of the limiting frame 613, and the fixed frames 615 can slide back and forth with the stirring rod 5. Evenly distributed fixed shafts 616 are fixedly connected to one end of the outer side of the fixed frame 615, and a fixed shaft 616 is fixedly connected to the other end of the fixed shaft 616. During the material classification process of the guide filter 610, the ball block 617, through the first fixed pipe 606 and the second fixed pipe 607 at the end of the heat-conducting cylinder 601, simultaneously drives the cam 611 to rotate. At this time, the cam 611 continuously pushes the push block 612 in a cyclical manner. The push block 612 continuously pushes the limit frame 613 to compress the second spring 614. During the process of the push block 612 pushing the limit frame 613 to compress the second spring 614, when the cam 611 and the push block 612 disengage, the elastic force of the second spring 614 restores the limit frame 613 to quickly reset. This further causes the limit frame 613 to push the ball block 617 to quickly collide with the guide filter 610 through the fixed frame 615 and the fixed shaft 616, causing the guide filter 610 to vibrate continuously, thus achieving anti-clogging treatment of the guide filter 610 during material classification.

[0035] Furthermore, such as Figure 2-3 As shown, in order to solve the problem of not being able to keep the material in a loose, fluidized or semi-fluidized state, the circulating disturbance device 7 includes a turntable 701. The bottom of the outer side of the stirring shaft 4 is fixedly connected to the turntable 701, which is rotatably connected to the mixing tank 1. The top of the turntable 701 is fixedly connected to a ring-shaped, evenly distributed inclined plate 702. During the mixing process, the stirring shaft 4 continuously drives the turntable 701 to rotate. When the turntable 701 drives the top ring-shaped, evenly distributed inclined plate 702 to rotate, it facilitates the continuous scraping, disturbance, and lifting of the bottom layer of material in the tank, preventing the material from settling and forming a hard, compacted layer for a long time. This makes it easier to keep the material in a loose, fluidized or semi-fluidized state.

[0036] Furthermore, such as Figure 1-3As shown, to address the problem that the localized high temperatures generated by grinding micro-agglomerates can lead to the volatilization, decomposition, or failure of the leaching acid, resulting in chemical changes in the NdFeB material itself, the temperature control device 8 includes a constant temperature circulator 801. The constant temperature circulator 801 is located at one end of the outer side of the slurry tank 1. The inlet end of the constant temperature circulator 801 is connected to a return pipe 802, and the other end of the return pipe 802 is connected to the slurry tank 1. A rotating sleeve 803 is rotatably and sealingly arranged in an annular shape at the inner edge of the slurry tank 1, and the rotating sleeve 803 is fixedly connected to the stirring rod 5. The rotating sleeve 803 is sealed and connected to the first fixed pipe 606 in the auxiliary grinding device 6, and the first fixed pipe 606 can rotate with the rotating sleeve 803. The liquid outlet end of the constant temperature circulator 801 is connected to a liquid outlet pipe 804 that penetrates the mixing tank 1, and the liquid outlet pipe 804 is fixedly connected to the mixing tank 1. The other end of the liquid outlet pipe 804 is connected to a fixed pipe 805 that penetrates the mixing tank 1, and the fixed pipe 805 is inserted into the inside of the stirring shaft 4. The fixed pipe 805 penetrates the large bevel gear 609 in the auxiliary grinding device 6, and the fixed pipe 805 is connected to the mixing tank. The fixed tube 805 is fixedly connected to the large bevel gear 609 in the auxiliary grinding device 6. A rotating sleeve 806 is rotatably connected to the outside of the fixed tube 805, and evenly distributed through holes are opened on the outer side of the portion of the fixed tube 805 located inside the rotating sleeve 806. The fixed tube 805 is rotatably connected to the stirring shaft 4. The second fixed tube 607 in the auxiliary grinding device 6 is sealed and connected to the rotating sleeve 806, and the second fixed tube 607 in the auxiliary grinding device 6 can rotate with the rotating sleeve 806. This process involves grinding the graded micro-agglomerates during slurry preparation. In the process, the cooled medium is continuously pumped into the heat-conducting cylinder 601 through the outlet pipe 804, the fixed pipe 805, the through hole on the outside of the rotating sleeve 806, and the second fixed pipe 607 via the constant temperature circulator 801. Then, it flows back into the constant temperature circulator 801 through the first fixed pipe 606, the rotating sleeve 803, and the return pipe 802, further removing the heat generated during the grinding of micro-agglomerates. This can prevent the leaching acid from evaporating, decomposing, or failing due to excessively high local temperatures, and also avoid unnecessary chemical changes in the NdFeB material itself due to overheating.

[0037] The slurry preparation principle for NdFeB waste: NdFeB waste (such as sludge and scrap) and a specific ratio of leaching acid are added to the slurry preparation tank 1 through the feed hopper 2. Then, the device is started by the controller 10. At this time, the motor 3 drives the stirring rod 5 on the outside of the stirring shaft 4 to rotate for slurry preparation. At the same time, the circulating disturbance device 7 continuously scrapes, disturbs, and lifts the material at the bottom of the tank, preventing the material from settling and forming a hard crust for a long time. This keeps the material in a fluidized or semi-fluidized loose state. The auxiliary grinding device 6 continuously classifies the lifted material and then grinds the separated micro-agglomerates. The temperature control device 8 continuously controls the temperature at the grinding point to prevent excessive local temperature from causing damage. This avoids the problems of leaching acid volatilization, decomposition, or failure, and also prevents unnecessary chemical changes in the NdFeB material itself due to overheating, ensuring the effectiveness of the reaction reagents and the quality of the materials. When the specified slurry preparation time is reached, the valve of the sampling pipe 9 is manually opened to take out a small amount of slurry sample. Then, an external laser particle size analyzer is used to test the taken slurry sample. When the particle size distribution curve is stable and the median particle size (D50) reaches the process target value determined in advance through experiments (e.g., <50μm or finer), the slurry preparation is completed. In this application, the controller 10 integrates a PLC control system, which coordinates the orderly operation of the electrical appliances in the control device through a preset program to ensure the stability and reliability of the coordinated operation of the electrical appliances.

[0038] The above are preferred embodiments of the present invention. The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention. All such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A slurry preparation device for recycling NdFeB waste, comprising a slurry preparation tank (1), an auxiliary grinding device (6), a circulation agitation device (7), and a temperature control device (8), characterized in that: The top left of the mixing tank (1) is connected to the feed hopper (2). The center of the top of the mixing tank (1) is fixedly connected to the motor (3). The end of the main shaft of the motor (3) is fixedly connected to the stirring shaft (4) which is rotatably connected to the mixing tank (1). The outside of the stirring shaft (4) is fixedly connected to the stirring rod (5). The inside of the stirring rod (5) is provided with an auxiliary grinding device (6). The bottom of the outside of the stirring shaft (4) is provided with a circulation disturbance device (7). One end of the outside of the mixing tank (1) is provided with a temperature control device (8). The bottom right side of the mixing tank (1) is connected to the discharge pipe (9) with a valve fixedly connected inside. The top of the front end of the mixing tank (1) is fixedly connected to the controller (10). The bottom of the controller (10) is provided with an inspection door (11), and the inspection door (11) is connected to the mixing tank (1) with a sealing hinge.

2. The slurry preparation device for recycling NdFeB waste according to claim 1, characterized in that: The auxiliary grinding device (6) includes a heat-conducting cylinder (601). The heat-conducting cylinder (601) is provided inside the stirring rod (5). The heat-conducting cylinder (601) is connected to the outside of the heat-conducting cylinder (601) by bolts. A fixed seat (603) is provided at the top of the inner side of the stirring rod (5) for limiting sliding. A stationary grinding block (604) is connected to the bottom of the fixed seat (603) by bolts. Both the moving grinding block (602) and the stationary grinding block (604) are made of carbide alloy. Both the moving grinding block (602) and the stationary grinding block (604) have radial straight ridges on their outer sides. The moving grinding block (602) The radial straight ridges on the outer side and the radial straight ridges on the outer side of the stationary grinding block (604) are staggered. The gap between the moving grinding block (602) and the stationary grinding block (604) is gradually narrowed. One end of the heat-conducting cylinder (601) is sealed and connected to a first fixed tube (606) that passes through the stirring rod (5), and the first fixed tube (606) can rotate with the stirring rod (5). The other end of the heat-conducting cylinder (601) is sealed and connected to a second fixed tube (607) that passes through the stirring rod (5) and the stirring shaft (4), and the second fixed tube (607) can rotate with the stirring rod (5) and the stirring shaft (4).

3. The slurry preparation device for recycling NdFeB waste according to claim 2, characterized in that: The top of the fixed base (603) is fixedly connected to a first spring (605), and the other end of the first spring (605) is fixedly connected to the stirring rod (5).

4. A slurry preparation device for recycling NdFeB waste according to claim 2, characterized in that: The outer end of the second fixed tube (607) is fixedly connected to a small bevel gear (608) located inside the stirring shaft (4), and the outer side of the small bevel gear (608) is meshed with a large bevel gear (609) located inside the stirring shaft (4).

5. A slurry preparation device for recycling NdFeB waste according to claim 2, characterized in that: An inclined guide filter (610) is fixedly connected to one end of the outer side of the stirring rod (5), and the guide filter (610) is symmetrically distributed on the outer side of the stirring rod (5). The filter holes of the guide filter (610) are arranged in a long strip shape, and the cross-sectional view of the filter holes of the guide filter (610) is arranged in an isosceles trapezoidal shape. The guide filter (610) is made of polyurethane.

6. A slurry preparation device for recycling NdFeB waste according to claim 2, characterized in that: A cam (611) located inside the stirring rod (5) is fixedly connected to one end of the outer side of the first fixed tube (606) and the other end of the outer side of the second fixed tube (607). A push block (612) is contacted on the outer side of the cam (611). A limiting frame (613) that slides on the inner side of the stirring rod (5) is fixedly connected to the outer side of the push block (612). A second spring (614) is fixedly connected to one side of the limiting frame (613), and the other end of the second spring (614) is fixedly connected to the stirring rod (5). A fixing frame (615) that passes through the stirring rod (5) is fixedly connected to both the upper and lower ends of the limiting frame (613), and the fixing frame (615) can slide back and forth with the stirring rod (5). A uniformly distributed fixing shaft (616) is fixedly connected to one end of the outer side of the fixing frame (615), and a ball block (617) is fixedly connected to the other end of the fixing shaft (616).

7. A slurry preparation device for recycling NdFeB waste according to claim 1, characterized in that: The circulating disturbance device (7) includes a turntable (701), and the bottom of the outer side of the stirring shaft (4) is fixedly connected to the turntable (701) which is rotatably connected to the mixing tank (1). The top of the turntable (701) is fixedly connected to a ring-shaped, uniformly distributed inclined plate (702).

8. A slurry preparation device for recycling NdFeB waste according to claim 4, characterized in that: The temperature control device (8) includes a constant temperature circulator (801). The constant temperature circulator (801) is provided at one end of the outer side of the mixing tank (1). The inlet end of the constant temperature circulator (801) is connected to a return pipe (802), and the other end of the return pipe (802) is connected to the mixing tank (1). A rotating sleeve (803) is provided in a ring shape at the inner edge of the mixing tank (1). The rotating sleeve (803) is fixedly connected to the stirring rod (5). The rotating sleeve (803) is sealed and connected to the first fixed pipe (606) in the auxiliary grinding device (6). The first fixed pipe (606) can rotate with the rotating sleeve (803). The outlet end of the constant temperature circulator (801) is connected to an outlet pipe (804) that penetrates the mixing tank (1). The outlet pipe (804) is fixedly connected to the mixing tank (1). The other end of the fixed pipe (805) is connected to the fixed pipe (805) that passes through the mixing tank (1), and the fixed pipe (805) is inserted into the inside of the stirring shaft (4). The fixed pipe (805) passes through the large bevel gear (609) in the auxiliary grinding device (6), and the fixed pipe (805) is fixedly connected to the mixing tank (1) and the large bevel gear (609) in the auxiliary grinding device (6). The fixed pipe (805) is sealed and rotatably connected to the outside of the rotating sleeve (806), and the part of the fixed pipe (805) located inside the rotating sleeve (806) has uniformly distributed through holes. The fixed pipe (805) is rotatably connected to the stirring shaft (4). The second fixed pipe (607) in the auxiliary grinding device (6) is sealed and connected to the rotating sleeve (806), and the second fixed pipe (607) in the auxiliary grinding device (6) can rotate with the rotating sleeve (806).

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