Rare earth oxide roasting process heat recovery device
By designing a heat recovery device with spiral tubes and spiral heat-conducting discs in the rare earth oxide calcination process, the problem of waste heat in the rotary kiln was solved, the waste heat was effectively utilized, the calcination efficiency was improved, and the production cost was reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUICHUAN QUNXIN MAGNETIC NEW MATERIAL CO LTD
- Filing Date
- 2025-09-10
- Publication Date
- 2026-07-31
AI Technical Summary
In the current rare earth oxide roasting process, the residual heat in the rotary kiln cannot be effectively recovered and utilized, resulting in energy waste.
A heat recovery device for rare earth oxide roasting process was designed, including a spiral tube and a spiral heat-conducting plate. The device utilizes the waste heat of the rotary furnace to preheat the rare earth element oxides to be calcined at high temperature, and a uniform feeding mechanism is used to achieve uniform feeding and avoid accumulation.
Effectively utilizing the waste heat of the rotary kiln for preheating shortens the high-temperature calcination time, reduces fuel consumption, improves calcination efficiency, and lowers production costs.
Smart Images
Figure CN224580748U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rare earth oxide roasting technology, and in particular to a heat recovery device for rare earth oxide roasting process. Background Technology
[0002] Rare earth element oxides are a collective term for oxides of lanthanide elements (such as lanthanum, cerium, neodymium, etc.) as well as scandium and yttrium. They possess unique physicochemical properties, such as high melting points, excellent catalytic activity, and optical properties. They are widely used in new energy, electronics, magnetic materials, catalysts, and other fields, and are key materials for high-end manufacturing and green technologies.
[0003] During the production process, rare earth element oxides usually need to undergo high-temperature calcination, decomposition, or reduction reactions to remove impurities and improve purity. Rotary furnaces, due to their excellent thermal conductivity and uniform heating characteristics, have become an indispensable processing equipment for the high-temperature calcination of rare earth element oxides.
[0004] After rare earth oxides are processed, a large amount of high-temperature waste heat remains in the rotary kiln. However, most rotary kilns on the market lack equipment to recover and utilize this waste heat. This heat is usually directly discharged into the environment, resulting in energy waste. Therefore, a heat recovery device for rare earth oxide roasting process is proposed to solve the above problems. Utility Model Content
[0005] To overcome the above deficiencies, this utility model provides a heat recovery device for rare earth oxide roasting process, which aims to improve the problem mentioned in the prior art that "the residual heat of the rotary kiln cannot be rationally utilized".
[0006] To achieve the above objectives, the present invention adopts the following technical solution: a rare earth oxide roasting process heat energy recovery device, including a recovery tank, a spiral tube that is connected to and penetrates the inner wall of the recovery tank, an air inlet at one end of the spiral tube, an air outlet at the other end of the spiral tube, a hopper that is fixedly connected to the top of the recovery tank, and a preheating mechanism and a uniform material mechanism that are provided inside the recovery tank. The preheating mechanism includes a spiral heat-conducting disk, a sliding plate is fixedly connected to the top of the spiral heat-conducting disk, the sliding plate passes through and is slidably connected to the top inner wall of the recycling tank, the sliding plate has an opening, a motor is fixedly connected to the top of the recycling tank, a rotating shaft is fixedly connected to the output end of the motor, and an eccentric wheel is fixedly connected to the outer wall of the rotating shaft.
[0007] As a further description of the above technical solution: The material leveling mechanism includes a rotating rod that passes through and is rotatably connected to the top inner wall of the recycling tank.
[0008] As a further description of the above technical solution: A turntable is fixedly connected to the bottom of the rotating rod, and the upper surface of the turntable is attached to the bottom of the hopper.
[0009] As a further description of the above technical solution: The turntable has two sets of through holes, which are mirror images of each other on the turntable with the rotating rod as the central axis.
[0010] As a further description of the above technical solution: A driven bevel gear is fixedly connected to the top of the rotating rod.
[0011] As a further description of the above technical solution: A drive bevel gear is fixedly connected to the end of the rotating shaft away from the motor, and the drive bevel gear meshes with the driven bevel gear.
[0012] As a further description of the above technical solution: The spiral tube and the spiral heat-conducting disk have the same spiral angle, and the outer wall of the spiral heat-conducting disk is attached to the inner side of the spiral tube.
[0013] As a further description of the above technical solution: The eccentric wheel and the rotating shaft are in an eccentric state, and the outer wall of the eccentric wheel is attached to the inner wall of the opening.
[0014] This utility model has the following beneficial effects: 1. In this utility model, the design of the preheating mechanism allows the use of residual heat in the rotary kiln to preheat the rare earth element oxides to be calcined at high temperatures. This enables the rational use of residual heat in the rotary kiln. By preheating the rare earth element oxides, the material temperature can be gradually increased, thereby reducing the temperature difference in the subsequent high-temperature calcination stage. This shortens the high-temperature calcination time and reduces fuel consumption, thus improving the high-temperature calcination efficiency and reducing production costs.
[0015] 2. In this utility model, the design of the uniform material mechanism allows rare earth element oxides to fall evenly into the interior of the spiral heat conduction plate, thereby preventing the accumulation of rare earth element oxides inside the spiral heat conduction plate and enabling the rare earth element oxides to be preheated evenly. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the recycling tank of this utility model; Figure 3 This is a schematic diagram of the overall structure of the spiral tube and spiral heat-conducting plate of this utility model; Figure 4 This utility model Figure 1 A magnified structural diagram at point A; Figure 5 This utility model Figure 2 A magnified structural diagram at point B.
[0017] Legend: 1. Recycling tank; 2. Spiral tube; 3. Air inlet; 4. Air outlet; 5. Hopper; 6. Preheating mechanism; 61. Spiral heat-conducting plate; 62. Slide plate; 63. Through hole; 64. Motor; 65. Rotating shaft; 66. Eccentric wheel; 7. Material leveling mechanism; 71. Rotating rod; 72. Turntable; 73. Through hole; 74. Driven bevel gear; 75. Driving bevel gear. Detailed Implementation
[0018] 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.
[0019] Reference Figures 1-3 This utility model provides an embodiment of a rare earth oxide roasting process heat recovery device, including a recovery tank 1. A spiral tube 2 is fixedly connected through the inner wall of the recovery tank 1. The spiral tube 2 can heat the spiral heat conduction plate 61. One end of the spiral tube 2 is provided with an air inlet 3, and the other end of the spiral tube 2 is provided with an air outlet 4. The residual heat in the rotary kiln is injected into the interior of the spiral tube 2 through the air inlet 3, so that the hot air gradually moves upward in a spiral shape inside the spiral tube 2 and is finally discharged through the air outlet 4. A hopper 5 is fixedly connected to the top of the recovery tank 1. A preheating mechanism 6 and a uniform material mechanism 7 are provided inside the recovery tank 1.
[0020] Reference Figures 1-3The preheating mechanism 6 includes a spiral heat-conducting plate 61, which is made of aluminum. The spiral heat-conducting plate 61 preheats rare earth element oxides, thus utilizing the residual heat of the rotary kiln. The spiral tube 2 and the spiral heat-conducting plate 61 have the same spiral angle. Due to the spiral shape of the spiral heat-conducting plate 61, the rare earth element oxides can slowly slide downwards inside, ensuring thorough preheating. The outer wall of the spiral heat-conducting plate 61 is attached to the inner side of the spiral tube 2, and the heat from the spiral tube 2 gradually... The heat is gradually conducted to the spiral heat conduction plate 61, causing the temperature of the spiral heat conduction plate 61 to gradually increase. A sliding plate 62 is fixedly connected to the top of the spiral heat conduction plate 61. The sliding plate 62 passes through and slides on the inner wall of the top of the recycling tank 1. While the sliding plate 62 slides up and down on the top of the recycling tank 1, it will cause the spiral heat conduction plate 61 to vibrate up and down. An opening 63 is provided on the sliding plate 62. A motor 64 is fixedly connected to the top of the recycling tank 1. When the motor 64 is started, it drives the rotating shaft 65 to rotate. While the rotating shaft 65 is rotating, it will drive the eccentric wheel 66 to rotate synchronously.
[0021] Reference Figure 4 The output end of the motor 64 is fixedly connected to a rotating shaft 65, and an eccentric wheel 66 is fixedly connected to the outer wall of the rotating shaft 65. The eccentric wheel 66 and the rotating shaft 65 are in an eccentric state. The outer wall of the eccentric wheel 66 is attached to the inner wall of the opening 63. When the rotating shaft 65 rotates, it will drive the eccentric wheel 66 to rotate synchronously. At this time, the eccentric wheel 66 will move back and forth against the inner wall of the opening 63 and push and pull the slide plate 62 back and forth, so that the slide plate 62 slides up and down on the top of the recycling tank 1.
[0022] Reference Figures 4-5 The material feeding mechanism 7 includes a rotating rod 71, which is rotatably connected to the top inner wall of the recycling tank 1. A turntable 72 is fixedly connected to the bottom of the rotating rod 71. The upper surface of the turntable 72 is attached to the bottom of the hopper 5. When the rotating rod 71 rotates, it drives the turntable 72 to rotate synchronously against the bottom of the hopper 5. Two sets of through holes 73 are opened on the turntable 72. The two sets of through holes 73 are mirror images of the rotating rod 71 on the turntable 72. The rotation of the turntable 72, in conjunction with the two sets of through holes 73, allows the hopper 5 to feed material in a quantitative manner. A driven bevel gear 74 is fixedly connected to the top of the rotating rod 71. A drive bevel gear 75 is fixedly connected to the end of the rotating shaft 65 away from the motor 64. When the rotating shaft 65 rotates, it drives the drive bevel gear 75 to rotate synchronously. The drive bevel gear 75 meshes with the driven bevel gear 74. When the drive bevel gear 75 rotates, it engages with the driven bevel gear 74 to drive the rotating rod 71 to rotate on the inner wall of the recycling tank 1.
[0023] Working principle: The residual heat in the rotary kiln is injected into the spiral tube 2 through the air inlet 3, causing the hot air to move upwards in a spiral shape inside the spiral tube 2 and finally be discharged through the air outlet 4. At the same time, the temperature of the spiral tube 2 gradually increases after the hot air enters it, and the inner side of the spiral tube 2 is in contact with the outer wall of the spiral heat-conducting plate 61. At this time, the heat of the spiral tube 2 is gradually conducted to the spiral heat-conducting plate 61, causing the temperature of the spiral heat-conducting plate 61 to gradually increase. Then, the rare earth element oxides to be calcined at high temperature are poured into the hopper 5, allowing the rare earth element oxides to fall into the spiral heat-conducting plate 61 through the hopper 5. Simultaneously, the motor 64 is started to drive the rotating shaft 65 to rotate. As the rotating shaft 65 rotates, it drives the eccentric wheel 66 to rotate synchronously. At this time, the eccentric wheel 66 moves back and forth against the inner wall of the opening 63 and pushes and pulls the slide plate 62 back and forth, so that the slide plate 62 is recycled. The top of tank 1 slides up and down repeatedly. At this time, the sliding plate 62 will drive the spiral heat-conducting plate 61 to vibrate up and down inside the recovery tank 1. Through the vibration of the spiral heat-conducting plate 61 and its spiral inclination angle, the rare earth element oxides inside can gradually slide down in a spiral shape. During the sliding process, the rare earth element oxides can be preheated by the temperature of the spiral heat-conducting plate 61, so as to utilize the residual heat of the rotary kiln. Furthermore, due to the spiral shape of the spiral heat-conducting plate 61, the rare earth element oxides can slide down slowly inside, so that the rare earth element oxides can be fully preheated. By preheating the rare earth element oxides, the material temperature can be gradually increased, thereby reducing the temperature difference in the subsequent high-temperature calcination stage, which can shorten the high-temperature calcination time and reduce fuel consumption. This not only improves the high-temperature calcination efficiency but also reduces production costs.
[0024] While rotating, the shaft 65 drives the drive bevel gear 75 to rotate synchronously. The drive bevel gear 75, in turn, meshes with the driven bevel gear 74, causing the rotating rod 71 to rotate on the inner wall of the recovery tank 1. Simultaneously, the rotating rod 71 drives the turntable 72 to rotate synchronously. The turntable 72, in turn, causes two sets of through holes 73 to rotate around the rotating rod 71. When the through holes 73 move to below the hopper 5 during this rotation, the material inside the hopper 5 falls through the through holes 73 into the spiral heat-conducting disk 61. When the through holes 73 are misaligned with the discharge port of the hopper 5 during this rotation, the turntable 72 blocks the discharge port of the hopper 5, preventing the material inside the hopper 5 from discharging downwards. Therefore, the rotation of the turntable 72, in conjunction with the two sets of through holes 73, allows for quantitative material discharge from the hopper 5, ensuring that the material falls evenly into the spiral heat-conducting disk 61 and preventing material accumulation that could lead to poor preheating.
[0025] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A device for recovering heat energy from a rare earth oxide roasting process, comprising a recovery tank (1), characterized in that: The inner wall of the recycling tank (1) is connected to a spiral tube (2), one end of the spiral tube (2) is provided with an air inlet (3), the other end of the spiral tube (2) is provided with an air outlet (4), the top of the recycling tank (1) is fixedly connected with a hopper (5), and the inside of the recycling tank (1) is provided with a preheating mechanism (6) and a uniform material mechanism (7). The preheating mechanism (6) includes a spiral heat-conducting disk (61), and a sliding plate (62) is fixedly connected to the top of the spiral heat-conducting disk (61). The sliding plate (62) passes through and is slidably connected to the top inner wall of the recycling tank (1). An opening (63) is provided on the sliding plate (62). A motor (64) is fixedly connected to the top of the recycling tank (1). A rotating shaft (65) is fixedly connected to the output end of the motor (64). An eccentric wheel (66) is fixedly connected to the outer wall of the rotating shaft (65).
2. The rare earth oxide calcination process heat recovery apparatus of claim 1, wherein: The material leveling mechanism (7) includes a rotating rod (71) that passes through and is rotatably connected to the top inner wall of the recycling tank (1).
3. The heat recovery device for rare earth oxide roasting process according to claim 2, characterized in that: The bottom of the rotating rod (71) is fixedly connected to a turntable (72), and the upper surface of the turntable (72) is attached to the bottom of the hopper (5).
4. The rare earth oxide calcination process heat recovery apparatus of claim 3, wherein: The turntable (72) has two sets of through holes (73), which are mirror images of the turntable (72) with the rotating rod (71) as the central axis.
5. The rare earth oxide calcination process heat recovery apparatus of claim 2, wherein: The top of the rotating rod (71) is fixedly connected to a driven bevel gear (74).
6. The rare earth oxide calcination process heat energy recovery device of claim 1, wherein: The drive bevel gear (75) is fixedly connected to one end of the shaft (65) away from the motor (64), and the drive bevel gear (75) meshes with the driven bevel gear (74).
7. The rare earth oxide calcination process heat recovery apparatus of claim 1, wherein: The spiral tube (2) and the spiral heat-conducting disk (61) have the same spiral angle, and the outer wall of the spiral heat-conducting disk (61) is attached to the inner side of the spiral tube (2).
8. The rare earth oxide calcination process heat energy recovery device of claim 1, wherein: The eccentric wheel (66) is in an eccentric state with the rotating shaft (65), and the outer wall of the eccentric wheel (66) is attached to the inner wall of the opening (63).