NdFeB waste oxidizing roasting equipment

Abstract

The utility model relates to the technical field of roasting equipment, and discloses neodymium iron boron waste oxidizing roasting equipment which is characterized in that gradient heating and heating pipe power supply are realized by arranging structures such as a preheating tank, a heating pipe and a gas nozzle, and materials in a mixing inner barrel are preliminarily preheated by heating of the heating pipe and left-right swinging of a reaction barrel; and after the reaction is completed, power supply of the first motor is stopped, a natural gas or liquefied gas pipeline is connected with a gas nozzle, natural gas is injected into the reaction barrel for gas heating, combustion-supporting air is injected into the reaction barrel through a gas outlet pipe B, and the gradient heating effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of roasting equipment technology, and in particular to an oxidation roasting equipment for NdFeB waste. Background Technology

[0002] The recycling and reuse of NdFeB waste has significant economic and environmental benefits. The recovered rare earth and valuable metal elements can be applied to wind power generation, hybrid vehicles, consumer electronics, intelligent robotics manufacturing, energy-saving elevators, energy-saving oil pumping units, and other fields to achieve the production of high value-added products. The NdFeB waste oxidation roasting equipment mainly includes a roasting box and a stirring device.

[0003] In existing technologies, uneven mixing of NdFeB waste materials during stirring, static or single-shaft stirring leads to insufficient contact between NdFeB waste and oxidant, resulting in low oxidation efficiency. The energy consumption during roasting heating is high, and traditional electric heating or gas radiation heating has low thermal efficiency. Furthermore, the flue gas generated after heating is directly discharged and cannot be reused. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an oxidation roasting device for NdFeB waste, which has the advantages of uniform mixing, high heating efficiency, and waste heat recovery, thus solving the problems mentioned in the background technology.

[0005] This utility model provides the following technical solution: a neodymium iron boron waste oxidation roasting device, including a reaction barrel, a barrel cover movably connected to the top of the reaction barrel, a preheating groove linearly arrayed on the inner wall of the reaction barrel, a heating tube fixedly installed inside the preheating groove, gas nozzles linearly arrayed on both sides of the reaction barrel, the gas nozzles communicating with the inside of the reaction barrel, gear A fixedly installed below the gas nozzles on both sides of the reaction barrel, a support on one side of gear A on both sides of the reaction barrel, a rotating frame rotatably installed on the top inner ring of the support, one end of the rotating frame fixedly connected to the reaction barrel, the rotating frame located on the inner ring of gear A, a mixing inner cylinder rotatably installed inside the reaction barrel, a heat pipe heat exchanger provided on one side of the reaction barrel, the heat pipe heat exchanger having a distribution chamber and a heat exchange chamber inside, the distribution chamber being divided into upper and lower chambers, and a pipeline connecting the heat pipe heat exchanger to both sides of the reaction barrel.

[0006] With the above structural design, this device can improve the oxidation efficiency of materials in practical applications. The sealing cover inside the mixing cylinder allows the material to react evenly with the oxidant during the rotation of the mixing cylinder. The heating pipe and gas nozzle achieve a gradient heating effect, and the heat pipe heat exchanger enables the recovery of waste heat from the flue gas.

[0007] Preferably, a first motor is fixedly installed in the inner ring of the middle part of the bracket, and a gear B is fixedly connected to the end of the output shaft of the first motor, and the gear B meshes with the gear A.

[0008] With the above structural setup, when the first motor starts, it drives gear B to rotate through the input shaft. At the same time, gear B drives the reaction tank to swing left and right through the meshing transmission with gear A, which can more comprehensively preheat the materials during the preheating stage.

[0009] Preferably, a second motor is fixedly installed on one side of the rotating frame, and the output shaft of the second motor passes through the rotating frame and is fixedly connected to the center of the mixing inner cylinder.

[0010] With the above structural configuration, the second motor drives the mixing inner cylinder to rotate through the output shaft, thereby achieving uniform mixing of the material inside the mixing inner cylinder. Due to the separation and guidance of the guide plate, the material has a wider contact surface with the oxidant.

[0011] Preferably, a sealing cover is movably connected to one side of the mixing inner cylinder, the connection between the sealing cover and the mixing inner cylinder is detachable, and guide plates are uniformly arranged in a circular pattern on the inner walls of the mixing inner cylinder and the sealing cover. The guide plates are spiral in shape and are arranged in a linear array on the inner walls of the mixing inner cylinder and the sealing cover.

[0012] With the above structural design, when the material is stirred inside the mixing cylinder, it will be separated by the guide plate after contacting the guide plate, which increases the contact area between the material and the oxidant and accelerates the oxidation reaction of the material.

[0013] Preferably, the bottom of the heat pipe heat exchanger is symmetrically fixedly equipped with support plates, an inlet pipe A is fixedly connected between the upper chamber of the distribution chamber and one side of the reaction tank, the heat exchange chamber is provided with a row of tubes in a ring array inside, the two ends of the row of tubes are respectively connected to the upper and lower chambers of the distribution chamber, an outlet pipe A is fixedly connected to the lower chamber of the distribution chamber, an inlet pipe B is fixedly installed through the middle of the heat exchange chamber, and an outlet pipe B is fixedly connected between the top of the heat exchange chamber and the other side of the reaction tank.

[0014] With the above-mentioned structural configuration, combustion-supporting gas is injected into the heat exchange chamber through the air inlet pipe B. The combustion-supporting gas and the flue gas exchange heat inside the heat exchange chamber. The preheated combustion-supporting gas is injected into the interior of the reaction vessel through the air outlet pipe B, achieving faster heating.

[0015] This utility model has the following advantages:

[0016] 1. This NdFeB waste oxidation roasting equipment achieves uniform material mixing through a structure including a support frame, a second motor, and a mixing inner cylinder. The barrel lid and sealing cap are opened sequentially, and materials and oxidant are added into the mixing inner cylinder in sequence. After filling, the sealing cap and barrel lid are installed. The second motor is then started, and its output shaft drives the entire mixing inner cylinder to rotate. The materials inside the mixing inner cylinder rotate synchronously. During rotation, the materials are separated by guide plates, dispersing any clumps and increasing the contact area between the materials and the oxidant, thereby improving the oxidation efficiency and achieving uniform material mixing.

[0017] 2. This NdFeB waste oxidation roasting equipment achieves gradient heating through a preheating tank, heating pipes, and gas nozzles. The heating pipes are powered by electricity. The heating of the heating pipes and the left-right swinging of the reaction tank preheat the material inside the mixing cylinder, accelerating the oxidation rate of the material. After the reaction is completed, the power supply of the first motor is stopped, and a natural gas or liquefied gas pipeline is connected to the gas nozzle. Natural gas is injected into the reaction tank for gas heating, and combustion air is injected into the reaction tank through the gas outlet pipe B, achieving the effect of gradient heating.

[0018] 3. This NdFeB waste oxidation roasting equipment achieves waste heat recovery by setting up a heat pipe heat exchanger, inlet pipe A, and outlet pipe B. The flue gas generated after natural gas combustion is discharged through inlet pipe A and enters the upper chamber of the distribution chamber. Then, the flue gas is transmitted through the tubes to the lower chamber of the distribution chamber and discharged through outlet pipe A. Combustion air is injected into the heat exchange chamber through inlet pipe B. The air achieves a preheating effect through contact with the outer wall of the tubes. Then, the preheated combustion air is injected into the interior of the reaction tank through outlet pipe B, which achieves the effects of waste heat recovery and air preheating. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the reaction vessel of this utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the mixing inner cylinder of this utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of the heat pipe heat exchanger of this utility model.

[0023] In the diagram: 1. Reaction tank; 11. Tank lid; 12. Preheating tank; 13. Heating tube; 14. Gas nozzle; 15. Gear A; 2. Support; 21. Rotating frame; 22. First motor; 23. Gear B; 24. Second motor; 3. Mixing inner cylinder; 31. Sealing cover; 32. Guide plate; 4. Heat pipe heat exchanger; 41. Distribution chamber; 42. Heat exchange chamber; 43. Support plate; 44. Inlet pipe A; 45. Tube; 46. Outlet pipe A; 47. Inlet pipe B; 48. Outlet pipe B. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-3 A neodymium iron boron waste oxidation roasting device includes a reaction barrel 1, a barrel cover 11 movably connected to the top of the reaction barrel 1, a preheating groove 12 linearly arrayed on the inner wall of the reaction barrel 1, a heating tube 13 fixedly installed inside the preheating groove 12, a gas nozzle 14 linearly arrayed on both sides of the reaction barrel 1, the gas nozzle 14 being connected to the inside of the reaction barrel 1, gears A15 fixedly installed on both sides of the reaction barrel 1 below the gas nozzles 14, a bracket 2 on one side of both sides of the reaction barrel 1 on the side of the gear A15, a heat pipe heat exchanger 4 on one side of the reaction barrel 1, and a pipeline connecting the heat pipe heat exchanger 4 to both sides of the reaction barrel 1.

[0026] In practical applications, this device can improve the oxidation efficiency of materials. By setting a sealing cover 31 inside the mixing inner cylinder 3, the mixing inner cylinder 3 can drive the material to react evenly with the oxidant during rotation. By setting heating pipe 13 and gas nozzle 14, a gradient heating effect is achieved. The heating pipe 13 preheats the material and accelerates the oxidation reaction. After oxidation, natural gas or liquefied petroleum gas is injected for main gas heating. By setting heat pipe heat exchanger 4, the waste heat of flue gas is recovered. Through the heat exchange effect between flue gas and combustion air, the temperature of the injected combustion air rises, and the thermal efficiency is improved.

[0027] Please see Figures 1-3 A rotating frame 21 is rotatably mounted on the top inner ring of the support 2. One end of the rotating frame 21 is fixedly connected to the reaction tank 1. The rotating frame 21 is located on the inner ring of the gear A15. A first motor 22 is fixedly mounted on the middle inner ring of the support 2. A gear B23 is fixedly connected to the end of the output shaft of the first motor 22. The gear B23 meshes with the gear A15.

[0028] By setting gear B23 to mesh with gear A15, when the first motor 22 starts, it drives gear B23 to rotate through the input shaft. By switching the positive and negative power supply of the first motor 22, the clockwise and counterclockwise rotation of gear B23 can be achieved. At the same time, gear B23 drives the reaction tank 1 to swing left and right through the meshing transmission with gear A15, so that the materials can be preheated more comprehensively during the preheating stage.

[0029] Please see Figures 1-3 The mixing inner cylinder 3 is rotatably installed inside the reaction tank 1. A second motor 24 is fixedly installed on one side of the rotating frame 21. The output shaft of the second motor 24 passes through the rotating frame 21 and is fixedly connected to the center of the shaft of the mixing inner cylinder 3.

[0030] The second motor 24 is connected to the mixing inner cylinder 3 through the output shaft. When the second motor 24 is powered, it drives the mixing inner cylinder 3 to rotate through the output shaft, thereby achieving uniform mixing of the material inside the mixing inner cylinder 3. Due to the separation and guidance of the guide plate 32, the material has a wider contact surface with the oxidant, which can achieve a better oxidation reaction.

[0031] Please see Figures 1-3 A sealing cover 31 is movably connected to one side of the mixing inner cylinder 3. The connection between the sealing cover 31 and the mixing inner cylinder 3 is detachable. The inner walls of the mixing inner cylinder 3 and the sealing cover 31 are uniformly provided with guide plates 32 in a circular shape. The guide plates 32 are spiral in shape and are uniformly arranged in a linear array on the inner walls of the mixing inner cylinder 3 and the sealing cover 31.

[0032] When the material is stirred inside the mixing cylinder 3, it will be separated by the guide plate 32 after contacting the guide plate 32, so that the contact area between the material and the oxidant is larger and the oxidation reaction of the material can be accelerated.

[0033] Please see Figures 1-4 The heat pipe heat exchanger 4 has a distribution chamber 41 and a heat exchange chamber 42 inside. The distribution chamber 41 is divided into upper and lower chambers. Support plates 43 are symmetrically fixedly installed at the bottom of the heat pipe heat exchanger 4. An inlet pipe A44 is fixedly connected between the upper chamber of the distribution chamber 41 and one side of the reaction tank 1. The heat exchange chamber 42 has a ring array of tubes 45 inside. The two ends of the tubes 45 are respectively connected to the upper and lower chambers of the distribution chamber 41. An outlet pipe A46 is fixedly connected to the lower chamber of the distribution chamber 41. An inlet pipe B47 is fixedly installed through the distribution chamber 41 in the middle of the heat exchange chamber 42. An outlet pipe B48 is fixedly connected between the top of the heat exchange chamber 42 and the other side of the reaction tank 1.

[0034] The flue gas generated after combustion flows into the upper chamber of the distribution chamber 41 through the inlet pipe A44, and then flows into the lower chamber through the tube 45. The combustion-supporting gas is injected into the heat exchange chamber 42 through the inlet pipe B47. The combustion-supporting gas and the flue gas exchange heat inside the heat exchange chamber 42. The preheated combustion-supporting gas is injected into the interior of the reaction vessel 1 through the outlet pipe B48 to achieve faster heating.

[0035] Working Principle: During use, open the barrel lid 11 and sealing cap 31 sequentially, and add materials and oxidant into the mixing inner cylinder 3. After filling, install the sealing cap 31 and barrel lid 11. Then, start the second motor 24. The output shaft of the second motor 24 drives the mixing inner cylinder 3 to rotate. The materials inside the mixing inner cylinder 3 rotate synchronously. During rotation, the materials are separated by the guide plate 32, dispersing any clumps and increasing the contact area between the materials and the oxidant, thus improving the oxidation efficiency. Simultaneously, start the first motor 22. The first motor 22 drives gear A15 via gear B23, causing the reaction barrel 1 to rotate. Powered by the forward and reverse directions of the first motor 22, the reaction barrel 1 swings left and right around the center of the rotating frame 21. Power is then supplied to the heating tube 13, which heats the material. The heating of pipe 13 and the left-right swinging of reaction tank 1 preheat the material inside mixing inner cylinder 3, accelerating the oxidation rate of the material. After the reaction is completed, the power supply of the first motor 22 is stopped, and the natural gas or liquefied gas pipeline is connected to the gas nozzle 14. Natural gas is injected into the reaction tank 1 for gas heating, and combustion air is injected into the reaction tank 1 through the gas outlet pipe B48. The flue gas generated after the natural gas combustion is discharged through the air inlet pipe A44 into the upper chamber of the distribution chamber 41. Then the flue gas is transmitted through the tube 45 to the lower chamber of the distribution chamber 41 and discharged through the gas outlet pipe A46. Combustion air is injected into the heat exchange chamber 42 through the air inlet pipe B47. The preheating effect is achieved by the contact between the air and the outer wall of the tube 45. Then the preheated combustion air is injected into the interior of the reaction tank 1 through the gas outlet pipe B48, thereby generating the effect of waste heat recovery and preheating the air.

Claims

1. A neodymium iron boron waste oxidizing roasting device comprising a reaction bucket (1), characterized in that: The top of the reaction bucket (1) is movably connected with a bucket cover (11), the inner wall of the reaction bucket (1) is linearly arrayed with preheating grooves (12), the preheating grooves (12) are fixedly installed with heating pipes (13) inside, the two sides of the reaction bucket (1) are linearly arrayed with gas nozzles (14), the gas nozzles (14) are communicated with the inside of the reaction bucket (1), the two sides of the reaction bucket (1) are fixedly installed with gear A (15) below the gas nozzles (14), the two sides of the reaction bucket (1) are provided with supports (2) on one side of the gear A (15), the top inner ring of the support (2) is rotatably installed with a rotating frame (21), the rotating frame (21) is fixedly connected between one end and the reaction bucket (1), the rotating frame (21) is located in the inner ring of the gear A (15), the inside of the reaction bucket (1) is rotatably installed with a mixing inner cylinder (3), one side of the reaction bucket (1) is provided with a heat pipe heat exchanger (4), the inside of the heat pipe heat exchanger (4) is provided with a distribution cavity (41) and a heat exchange cavity (42), the distribution cavity (41) is divided into upper and lower cavities, and the heat pipe heat exchanger (4) is provided with a pipeline connection between the two sides of the reaction bucket (1).

2. The neodymium iron boron waste material oxidation roasting apparatus according to claim 1, characterized in that: The middle inner ring of the support (2) is fixedly installed with a first motor (22), the output shaft end of the first motor (22) is fixedly connected with gear B (23), and the gear B (23) is engaged with the gear A (15).

3. The neodymium iron boron waste material oxidation roasting apparatus according to claim 2, characterized in that: One side of the rotating frame (21) is fixedly installed with a second motor (24), and the output shaft of the second motor (24) is fixedly connected between the rotating frame (21) and the shaft center of the mixing inner cylinder (3).

4. The neodymium iron boron waste material oxidation roasting apparatus according to claim 3, characterized in that: One side of the mixing inner cylinder (3) is movably connected with a sealing cover (31), the connection between the sealing cover (31) and the mixing inner cylinder (3) is detachable, the inner walls of the mixing inner cylinder (3) and the sealing cover (31) are uniformly provided with guide plates (32) in a circular ring shape, the guide plates (32) are helical in shape, and the guide plates (32) are linearly arrayed and uniformly arranged on the inner walls of the mixing inner cylinder (3) and the sealing cover (31).

5. The neodymium iron boron waste material oxidation roasting apparatus according to claim 4, characterized in that: The bottom of the heat pipe heat exchanger (4) is fixedly installed with support plates (43) in symmetry, the upper cavity of the distribution cavity (41) and one side of the reaction bucket (1) are fixedly connected with an air inlet pipe A (44), the heat exchange cavity (42) is annularly arrayed with tube banks (45) inside, the two ends of the tube banks (45) are respectively communicated with the upper and lower cavities of the distribution cavity (41), the lower cavity of the distribution cavity (41) is fixedly connected with an air outlet pipe A (46), the heat exchange cavity (42) is fixedly installed with an air inlet pipe B (47) through the distribution cavity (41), and the heat exchange cavity (42) is fixedly connected with an air outlet pipe B (48) between the top and the other side of the reaction bucket (1).

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