A rotary kiln for roasting laterite nickel ore

Abstract

The present invention discloses a rotary kiln for roasting laterite nickel ore, which relates to the field of rotary kilns and includes an annular barrel. A fuel port is provided on the side wall of the annular barrel, and a burner is fixedly installed at the position of the fuel port. An annular sealing plate is installed on the upper surface of the annular barrel, and a spreading device is installed on the surface of the annular sealing plate. For the rotary kiln for roasting laterite nickel ore of the present invention, by providing the annular barrel, the burner and the annular sealing cover, since the combustion of the burner relies on fuel and combustion-supporting gas, in the annular environment of the entire annular barrel, the annular barrel can be used to limit the injection of the combustion-supporting gas and fuel, so that the flame surrounds the inside of the entire annular barrel. Compared with the traditional straight-barrel rotary kiln, the heat loss is slower and the utilization rate is higher. Then, in cooperation with the spreading device, the materials inside are turned over to ensure that the heating and ripening degree of the materials is more uniform and avoid the generation of undercooked materials.

Description

Technical Field

[0001] The invention relates to the field of rotary kilns, in particular to a rotary kiln for roasting laterite nickel ore. Background Art

[0002] The rotary kiln is composed of processes such as gas flow, fuel combustion, heat transfer and material movement. The rotary kiln is how to make the fuel burn fully, the heat of fuel combustion can be effectively transferred to the material, and the material undergoes a series of physical and chemical changes after receiving the heat, and finally forms the finished clinker. At present, the common rotary kiln body is a straight cylinder with a very wide diameter, and is equipped with some roller devices to make the laterite nickel ore slowly rotate and transport.

[0003] During the transportation, the laterite nickel ore is heated by a burner, and the burner runs straight through the inside of the burner. However, due to the long axis of the rotary kiln body, the heated gas slowly moves to the kiln head during the heating and transportation process. Due to the heat transfer, a lot of heat will be lost. In addition, since the raw materials do not rotate in the rotary kiln body for a long time, if the heat is not enough, agglomeration or undercooking may occur, thereby affecting the quality of the laterite nickel ore clinker. Summary of the invention

[0004] The main purpose of the present invention is to provide a rotary kiln for roasting laterite nickel ore, which can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a rotary kiln for roasting laterite nickel ore, comprising an annular barrel, a side wall of the annular barrel is provided with a fuel port, a burner is fixedly installed at the position of the fuel port, an annular sealing plate is installed on the upper surface of the annular barrel, and a spreading device is installed on the surface of the annular sealing plate for moving the internal material of the annular barrel.

[0006] The spreading device includes a corrugated track, which is installed below the annular sealing plate. An annular limiting groove is provided on the surface of the corrugated track. A sliding wheel is installed inside the corrugated track. A connecting plate is fixedly installed above the sliding wheel. An oblique shovel is fixedly installed on the lower surface of the connecting plate. A driving device is fixedly installed above the connecting plate.

[0007] The number of the sliding wheels, connecting plates and inclined shovels are all set to be multiple, and they are installed in an annular array inside the waveform track. The driving device includes a motor, and a rotating plate is fixedly installed on the output shaft of the motor. Telescopic rods are inlaid and installed on the surfaces of multiple connecting plates. An annular through groove is formed on the surface of the annular sealing plate, and the top of the telescopic rod penetrates through the annular through groove, and the bottom of the telescopic rod is fixedly installed on the surface of the connecting plate. The rotating plate and the telescopic rod are fixedly connected by a connecting rod, and the number of the connecting rods is the same as the number of the connecting plates.

[0008] Both sides of the connecting plate are set to be arc-shaped, and both sides of the connecting plate are closely attached to the inner wall of the waveform track. The sliding wheel is a rotatable roller, which can ensure sliding inside the annular track of the waveform track.

[0009] An annular sealing strip is fixedly installed at the top of the telescopic rod, and the annular sealing strip is movably installed on the inner wall of the annular through groove. A lifting device is installed above the waveform track for lifting the entire waveform track away from the annular barrel, and a mounting and fixing device is installed on the surface of the lifting device for fixing the motor.

[0010] The lifting device includes an outer frame, and a motor is fixedly installed at the top of the outer frame. Two threaded rods penetrate through the top of the outer frame movably, and the ends of the two threaded rods are installed above the waveform track through connecting bearings. Rotating gears are threadedly connected to the surfaces of the two threaded rods, and a connecting gear is directly meshed between the two rotating gears. The output shaft of the motor is fixed inside the connecting gear, and the two rotating gears are movably installed at the top of the outer frame.

[0011] Mounting bearings are fixedly installed on the surfaces of the two threaded rods, and the surface of the motor is fixedly connected to the outer side wall of the mounting bearing. A heat preservation plate is installed above the rotating plate, and the output shaft of the motor penetrates through the heat preservation plate and is installed on the surface of the rotating plate. The ends of the two threaded rods are installed on the surface of the heat preservation plate through connecting bearings.

[0012] A convex connecting block is fixedly installed below the rotating gear, a groove is formed on the upper surface of the outer frame, and the convex connecting block is stuck inside the groove, and the shape of the groove is exactly adapted to the shape of the convex connecting block.

[0013] The surface of the inclined shovel is set to be a grid shovel, and the inclination of the grid shovel faces the rotation direction.

[0014] The fuel port is opened at a position slightly above the annular barrel.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In the present invention, by providing an annular barrel, a burner and an annular seal cover, sufficient materials are placed inside the annular barrel, and then the annular seal plate is covered. Next, the burner heats the inside of the annular barrel. Since the combustion of the burner relies on fuel and combustion-supporting gas, in the annular environment of the entire annular barrel, the annular barrel can be used to limit the injection of the combustion-supporting gas and fuel, so that the flame surrounds the inside of the entire annular barrel. Compared with the traditional straight rotary kiln, the heat loss is slower and the utilization rate is higher. Then, in cooperation with the spreading device, the materials inside are turned over to ensure that the heating and cooking degree of the materials is more uniform and to avoid the generation of undercooked materials.

[0017] 2. In the present invention, by providing an inclined shovel, the shape of the inclined shovel is such that it enters the inside of the materials obliquely downward. The inclined shovel also repeats the process of rising and falling, and the overall movement trajectory is also an annulus. When the inclined shovel rises, due to its inclined surface, it will slowly move the materials at the bottom obliquely upward to the upper part, and the materials at the upper part will also slowly fall to the hollowed-out position due to gravity, thus realizing the dispersion of the materials. Moreover, the annular movement of the inclined shovel can also slowly push all the materials closer to the burner to ensure uniform heating of the fuel and avoid caking or undercooked materials.

[0018] 3. In the present invention, by providing a connecting plate, sliding wheels and a corrugated track, both sides of the connecting plate are set to be arc-shaped. Both sides of the connecting plate are closely attached to the inner wall of the corrugated track. The sliding wheels are rotatable rollers that can ensure sliding and rotating inside the annular track of the corrugated track. Each time the position of the sliding wheel changes, its moving direction will change. Therefore, the sliding wheel can rotate on the surface of the connecting plate to achieve the function of turning at any time. Moreover, the shapes of both sides of the connecting plate also match the inner wall of the corrugated track to ensure smooth rotation.

[0019] 4. In the present invention, by providing a heat-insulating board, although the inside of the annular barrel is a vacant position, but it itself is an annulus and will have a large amount of heat inside. Therefore, the heat-insulating board is used to separate the inside and outside to reduce heat loss and ensure a higher heat utilization rate. The fuel inlet is opened at a position slightly above the annular barrel to enable more materials to be loaded inside the annular barrel and to ensure that the materials do not enter the inside of the burner.

[0020] 5. In the present invention, by setting the inclined shovel as a grid shovel, the surface of the inclined shovel is set as a grid shovel, and the inclination of the grid shovel faces the rotation direction. The grid shovel can minimize heat loss and ensure that the flame generated by heating passes through the grid shovel and directly burns on the surface of the materials. However, it is necessary to ensure that the grid of the grid shovel is smaller than the diameter of the materials to avoid difficult movement of the materials during rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a rotary kiln for roasting laterite nickel ore according to the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the lifting device of a rotary kiln for roasting laterite nickel ore according to the present invention;

[0023] Figure 3 This is a partial structural schematic diagram of the position of the convex connecting block of a rotary kiln for roasting laterite nickel ore according to the present invention;

[0024] Figure 4 This is a partial structural schematic diagram of the position of the annular material cylinder of a rotary kiln for roasting laterite nickel ore according to the present invention;

[0025] Figure 5 This is a split structural schematic diagram of the position of the annular sealing strip of a rotary kiln for roasting laterite nickel ore according to the present invention;

[0026] Figure 6 This is a schematic diagram of the internal structure of the corrugated track of a rotary kiln for roasting laterite nickel ore according to the present invention;

[0027] Figure 7 This is a bottom view structural schematic diagram of the corrugated track of a rotary kiln for roasting laterite nickel ore according to the present invention;

[0028] Figure 8 This is a schematic diagram of the internal structure of the annular material cylinder of a rotary kiln for roasting laterite nickel ore according to the present invention.

[0029] In the figure: 1. Annular material cylinder; 2. Fuel port; 3. Burner; 4. Annular sealing plate; 5. Spreading device; 51. Corrugated track; 52. Limiting groove; 53. Sliding wheel; 54. Connecting plate; 55. Inclined shovel; 6. Driving device; 61. Motor; 62. Rotating plate; 63. Telescopic rod; 64. Annular through groove; 65. Connecting rod; 7. Annular sealing strip; 8. Lifting device; 81. Outer frame; 82. Electric motor; 83. Threaded rod; 84. Rotating gear; 85. Connecting gear; 9. Installation and fixing device; 91. Installation bearing; 10. Heat preservation plate; 11. Convex connecting block; 12. Groove. Detailed implementation manners

[0030] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0031] As Figure 1-8 shown, it includes an annular material cylinder 1, as Figure 4As shown, the first end of the annular barrel 1 is connected, and a fuel port 2 is opened on the side wall of the annular barrel 1. A burner 3 is fixedly installed at the position of the fuel port 2. The burner 3 sprays combustion flames toward the inside of the annular barrel 1 and heats the material inside. An annular sealing plate 4 is installed on the upper surface of the annular barrel 1. The annular sealing plate 4 just completely seals the inside of the annular barrel 1. The annular sealing plate 4 can be opened and directly covers the top of the annular barrel 1 by its own gravity. A spreading device 5 is installed on the surface of the annular sealing plate 4 for spreading the internal material of the annular barrel 1. The material rotates under the action of the spreading device 5, and the bottom material and the top material are turned upside down.

[0032] First, place enough material inside the annular barrel 1, then cover the annular sealing plate 4, and then enable the burner 3 to heat the inside of the annular barrel 1. Since the combustion of the burner 3 relies on fuel and combustion-supporting gas, the annular barrel 1 can be used to limit the injection of combustion-supporting gas and fuel in the annular environment of the entire annular barrel 1, so that the flame surrounds the inside of the entire annular barrel 1. Compared with the traditional straight-cylinder rotary kiln, the heat dissipation is slower and the utilization rate is higher. Then, the spreading device 5 is used to turn the internal material over to ensure that the heating degree of the material is more uniform and avoid the production of raw materials.

[0033] The spreading device 5 includes a corrugated track 51, and the waves of the corrugated track 51 show a trend of sinusoidal transformation, but the difference is that the route of the sinusoidal transformation forms a ring and can be repeatedly flipped. The corrugated track 51 is installed below the annular sealing plate 4, and an annular limiting groove 52 is provided on the surface of the corrugated track 51. A sliding wheel 53 is installed inside the corrugated track 51, and a connecting plate 54 is fixedly installed above the sliding wheel 53. An oblique shovel 55 is fixedly installed on the lower surface of the connecting plate 54, and the oblique shovel 55 is just stuck in the inside of the annular limiting groove 52. A driving device 6 is fixedly installed above the connecting plate 54.

[0034] The shape of the inclined shovel 55 is that it enters the interior of the material at an angle downward. When in use, the sliding wheel 53 will rotate along the corrugated track 51. During the rotation, due to the limiting effect of the corrugated track 51, the sliding wheel 53 slowly moves from the crest to the trough during the circular rotation, and then moves from the trough to the crest, repeating the process. The inclined shovel 55 also repeats the process of rising and falling, and the overall movement trajectory is also a ring. During the rising process, the inclined shovel 55 will slowly move the bottom material obliquely upward due to its inclined surface, and the upper material will also slowly fall to the hollowed-out position due to gravity, thereby achieving the stirring of the material. The circular movement of the inclined shovel 55 can also slowly push all the materials closer to the burner 3, ensuring that the fuel is heated evenly and avoiding agglomeration or inclusion of raw materials.

[0035] There are multiple sliding wheels 53, connecting plates 54 and inclined shovels 55, and they are installed in an annular array inside the corrugated track 51. The driving device 6 includes a motor 61. A rotating plate 62 is fixedly installed on the output shaft of the motor 61. Telescopic rods 63 are inlaid and installed on the surfaces of multiple connecting plates 54. An annular through groove 64 is formed on the surface of the annular sealing plate 4. The top of the telescopic rod 63 penetrates through the annular through groove 64, and the bottom of the telescopic rod 63 is fixedly installed on the surface of the connecting plate 54. The rotating plate 62 and the telescopic rod 63 are fixedly connected by a connecting rod 65. The number of connecting rods 65 is the same as the number of connecting plates 54.

[0036] Setting multiple inclined shovels 55 to work simultaneously makes the mixing efficiency of the inclined shovels 55 higher. Compared with a single inclined shovel 55 working, it can ensure that the heating heat of the material can be more evenly dissipated. When in use, when the output shaft of the motor 61 rotates, it will drive the rotating plate 62 on its surface to rotate. The rotating plate 62 makes the connecting rod 65 rotate simultaneously. The connecting rod 65 drives the telescopic rod 63 to rotate. At this time, the connecting plate 54 and the sliding wheel 53 will rotate along the corrugated track 51. However, during the rotation process, since the inclined shovels 55 move up and down alternately, in order to ensure the smoothness of the movement, the telescopic rod 63 will automatically match the movement position of the inclined shovel 55. When moving to the position of the wave crest, the telescopic rod 63 will contract. When moving to the position of the wave trough, the telescopic rod 63 will stretch.

[0037] Both sides of the connecting plate 54 are set in an arc shape, as Figure 6 shown. Both sides of the connecting plate 54 are closely attached to the inner wall of the corrugated track 51. The sliding wheel 53 is a rotatable roller, which can ensure sliding inside the annular track of the corrugated track 51. When rotating inside the corrugated track 51, each change in the position of the sliding wheel 53 will change its movement direction. Therefore, the sliding wheel 53 can rotate on the surface of the connecting plate 54 to achieve the function of turning at any time. Moreover, the shapes of both sides of the connecting plate 54 also match the inner wall of the corrugated track 51 to ensure the smoothness of rotation.

[0038] An annular sealing strip 7 is fixedly installed at the top of the telescopic rod 63, as Figure 5 shown. The annular sealing strip 7 is movably installed on the inner wall of the annular through groove 64. A lifting device 8 is installed above the corrugated track 51 for lifting the entire corrugated track 51 away from the annular material cylinder 1. A viewing window can also be opened on the surface of the annular material cylinder 1 for observing the internal environment and the heating situation of the material at any time. An installation and fixing device 9 is installed on the surface of the lifting device 8 for fixing the motor 61. Since the entire annular material cylinder 1 is heavy, in order to ensure the running position, the motor 61 needs to be fixed.

[0039] Use the annular sealing strip 7 to block the vacant place. On the one hand, it prevents the combustion-supporting gas from overflowing from the position of the annular through groove 64 during the injection process, which not only causes waste of the combustion-supporting gas but also may lead to relatively large safety accidents. On the other hand, it will cause the temperature inside the annular barrel 1 to be insufficient, and the material is likely to be undercooked or caked, which will affect the quality of the material. When in use, use the lifting device 8 to lift the entire device, and the inside can be cleaned at any time.

[0040] The lifting device 8 includes an outer frame 81. As Figure 2 shown, a motor 82 is fixedly installed at the top of the outer frame 81. The motor 82 is fixed above the outer frame 81 through a fixing frame. Two threaded rods 83 pass through the top of the outer frame 81 movably. The ends of the two threaded rods 83 are installed above the corrugated track 51 through connecting bearings. At this time, it is necessary to ensure that the two threaded rods 83 can rotate, and during the upward movement of the threaded rods 83, the corrugated track 51 can also be driven to rise. Threaded gears 84 are threadedly connected to the surfaces of the two threaded rods 83. The two threaded gears 84 are directly meshed with a connecting gear 85. The output shaft of the motor 82 is fixed inside the connecting gear 85. The two threaded gears 84 are movably installed at the top of the outer frame 81.

[0041] In this process, when the output shaft of the motor 82 rotates, it will drive the middle connecting gear 85 to rotate. Due to the meshing effect between the connecting gear 85 and the two threaded gears 84, the two threaded gears 84 will be driven to rotate in the same direction. Since the threaded gear 84 is threadedly connected to the threaded rod 83, and the two threaded rods 83 are mutually involved and have a limiting effect, the two threaded rods 83 can be driven to move up or down, and the corrugated track 51 can be driven to move away from the inside of the annular barrel 1.

[0042] Mounting bearings 91 are fixedly installed on the surfaces of the two threaded rods 83. The surface of the motor 61 is fixedly connected to the outer side wall of the mounting bearing 91. The main purpose of the mounting bearing 91 is to ensure that the threaded rod 83 can rotate freely, and during the upward movement, the motor 61 can be driven to rise without affecting the overall use effect. A heat preservation plate 10 is installed above the two rotating plates 62. Since the inside of the annular barrel 1 is a vacant position, but it is annular itself and has a large amount of heat inside, the heat preservation plate 10 is used to separate the inside and outside to reduce heat loss and ensure higher heat utilization rate. The output shaft of the motor 61 passes through the heat preservation plate 10 and is installed on the surface of the rotating plate 62. The ends of the two threaded rods 83 are installed on the surface of the heat preservation plate 10 through connecting bearings.

[0043] A convex connecting block 11 is fixedly installed below the threaded gear 84. A groove 12 is provided on the upper surface of the outer frame 81. AsFigure 3 As shown, the convex connecting block 11 is stuck in the inside of the groove 12, and the shape of the groove 12 is just adapted to the shape of the convex connecting block 11. In order to ensure that the rotating gear 84 will not slowly move upward along the thread of the threaded rod 83 during the operation of the two rotating gears 84, it is necessary to fix the rotating gear 84 on the top of the outer frame 1, but it cannot affect the normal rotation of the rotating gear 84. Therefore, the use of the convex connecting block 11 is used to prevent the rotating gear 84 from detaching from the top of the outer frame 81.

[0044] The surface of the inclined shovel 55 is configured as a grid shovel, and the grid shovel is tilted toward the direction of rotation. The grid shovel can minimize the temperature loss and ensure that the flame generated by the heating passes through the grid shovel and burns directly on the surface of the material. However, it must be ensured that the grid of the grid shovel is smaller than the diameter of the material to avoid making it difficult for the material to move during rotation.

[0045] The fuel port 2 is opened at the upper part of the annular barrel 1. Figure 1 As shown, in order to allow more material to be loaded inside the annular barrel 1 and to ensure that the material does not enter the interior of the burner 3 .

[0046] It should be noted that the present invention is a rotary kiln for roasting laterite nickel ore. When in use, the output shaft of the motor 82 rotates, which will drive the connecting gear 85 in the middle to rotate. Due to the meshing action of the connecting gear 85 and the two rotating gears 84, the two rotating gears 84 will be driven to rotate in the same direction. Since the rotating gear 84 is threadedly connected to the threaded rod 83, and the two threaded rods 83 are mutually involved and have a limiting effect, the two threaded rods 83 can be driven to rise or fall. During this process, materials can be added to the inside, the burner 3 is turned on, the inside of the annular barrel 1 is heated, and the motor 61 is started. The output shaft of the motor 61 rotates, which will drive the rotating plate 62 on the surface to rotate. The rotating plate 6 2 makes the connecting rod 65 rotate at the same time, and the connecting rod 65 drives the telescopic rod 63 to rotate. At this time, the connecting plate 54 and the sliding wheel 53 will rotate along the corrugated track 51. However, in the process of rotation, since the inclined shovel 55 alternately moves up and down, in order to ensure the smoothness of the movement, the telescopic rod 63 will automatically match the movement position of the inclined shovel 55. In the process of rising, the inclined shovel 55 will slowly move the materials at the bottom obliquely upward to the top due to its inclined surface, and the materials at the top will also slowly fall to the hollowed position due to gravity, thereby achieving the mixing of the materials. In addition, the circular movement of the inclined shovel 55 can also slowly push all the materials closer to the burner 3, ensuring that the fuel is heated evenly and avoiding agglomeration or raw materials being sandwiched.

[0047] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A rotary kiln for roasting laterite nickel ore, Characterized in that: It includes an annular barrel (1), a fuel port (2) is provided on the side wall of the annular barrel (1), a burner (3) is fixedly installed at the position of the fuel port (2), an annular sealing plate (4) is installed on the upper surface of the annular barrel (1), and a spreading device (5) is installed on the surface of the annular sealing plate (4) for stirring the materials inside the annular barrel (1); The spreading device (5) includes a corrugated track (51), the corrugated track (51) is installed below the annular sealing plate (4), an annular limiting groove (52) is provided on the surface of the corrugated track (51), a sliding wheel (53) is installed inside the corrugated track (51), a connecting plate (54) is fixedly installed above the sliding wheel (53), a diagonal shovel (55) is fixedly installed on the lower surface of the connecting plate (54), a driving device (6) is fixedly installed above the connecting plate (54), the number of the sliding wheels (53), the connecting plates (54) and the diagonal shovels (55) are all set to be multiple, and are installed in the corrugated track (51) in an annular array. The driving device (6) includes a motor (61), a rotating plate (62) is fixedly installed on the output shaft of the motor (61), telescopic rods (63) are inlaid on the surfaces of multiple connecting plates (54), an annular through groove (64) is provided on the surface of the annular sealing plate (4), the top of the telescopic rod (63) penetrates through the annular through groove (64), and the bottom of the telescopic rod (63) is fixedly installed on the surface of the connecting plate (54). The rotating plate (62) and the telescopic rod (63) are fixedly connected by a connecting rod (65), the number of the connecting rods (65) is the same as the number of the connecting plates (54), both sides of the connecting plate (54) are arc-shaped, both sides of the connecting plate (54) are closely attached to the inner wall of the corrugated track (51), the sliding wheel (53) is a rotatable roller, which can ensure sliding inside the annular track of the corrugated track (51), an annular sealing strip (7) is fixedly installed at the top of the telescopic rod (63), the annular sealing strip (7) is movably installed on the inner wall of the annular through groove (64), and a lifting device (8) is installed above the corrugated track (51) for lifting the entire corrugated track (51) away from the annular barrel (1), and a mounting and fixing device (9) is installed on the surface of the lifting device (8) for fixing the motor (61).

2. The rotary kiln for roasting laterite nickel ore according to claim 1, Characterized in that: The lifting device (8) includes an outer frame (81). A motor (82) is fixedly installed at the top of the outer frame (81). Two threaded rods (83) pass through the top of the outer frame (81) movably. The ends of the two threaded rods (83) are installed above the corrugated track (51) through connecting bearings. Rotating gears (84) are threadedly connected to the surfaces of the two threaded rods (83). A connecting gear (85) meshes directly with the two rotating gears (84). The output shaft of the motor (82) is fixed inside the connecting gear (85). The two rotating gears (84) are movably installed at the top of the outer frame (81).

3. A rotary kiln for roasting laterite nickel ore according to claim 2, characterized in that: Mounting bearings (91) are fixedly installed on the surfaces of the two threaded rods (83). The surface of the motor (61) is fixedly connected to the outer side wall of the mounting bearing (91). A heat preservation plate (10) is installed above the rotating plate (62). The output shaft of the motor (61) passes through the heat preservation plate (10) and is installed on the surface of the rotating plate (62). The ends of the two threaded rods (83) are installed on the surface of the heat preservation plate (10) through connecting bearings.

4. A rotary kiln for roasting laterite nickel ore according to claim 3, characterized in that: A convex connecting block (11) is fixedly installed below the rotating gear (84). A groove (12) is provided on the upper surface of the outer frame (81). The convex connecting block (11) is stuck inside the groove (12). The shape of the groove (12) exactly matches the shape of the convex connecting block (11).

5. A rotary kiln for roasting laterite nickel ore according to claim 4, characterized in that: The surface of the inclined shovel (55) is provided as a grid shovel, and the inclination of the grid shovel faces the rotating direction.

6. A rotary kiln for roasting laterite nickel ore according to claim 1, characterized in that: The fuel port (2) is opened at a position slightly above the annular cylinder (1).

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