A rotary kiln device for harmlessly treating hydrometallurgical zinc slag

Abstract

This invention discloses a rotary kiln device for the harmless treatment of hydrometallurgical zinc slag, relating to the technical field of hydrometallurgical zinc production and related equipment. The invention includes a base with adjustment grooves on both sides of its upper surface. A first motor is mounted on one side of the upper surface of the base, and a gear plate is mounted on the output shaft of the first motor. The adjustment assembly includes a second motor and a threaded rod. Limiting components are provided at the four corners of the upper surface of the mounting plate, each including a limiting cylinder and a support ring. Connecting components are provided on the upper outer sides of both sides of the base, each including a support plate and a hydraulic cylinder. This invention facilitates quick installation and disassembly of the support plate by the limiting components, resulting in high work efficiency. Simultaneously, the connecting components facilitate quick and sealed connection and installation of the rotary kiln bodies on both sides. Furthermore, the adjustment components can be adjusted according to the length of the rotary kiln body and the position of the retaining rings, increasing its applicability.

Description

Technical Field

[0001] This invention belongs to the technical field of hydrometallurgical zinc smelting and related equipment, and in particular relates to a rotary kiln device for harmlessly treating hydrometallurgical zinc smelting slag. Background Technology

[0002] With the development of science and technology and society, equipment in various fields has been greatly developed. Zinc is one of the important materials in modern industrial battery manufacturing. Hydrometallurgical zinc smelting is one of the methods of zinc production. During the zinc production process, zinc-containing leaching residue is generated. This zinc-containing leaching residue is collected and put into a rotary kiln for recalcination. This can harmlessly treat the zinc-containing leaching residue and recover the zinc in it, reducing resource waste.

[0003] A search revealed that publication number CN216523024U, filed on January 12, 2022, discloses a rotary kiln bottom support and positioning device for producing zinc ingots from zinc-containing solid waste, relating to the field of mechanical equipment technology. This utility model includes a slide rail, transmission gears, a rotary kiln body, a base, an oil tank, a transmission motor, and an oil pump. The slide rail and transmission gears are connected to the rotary kiln body. The slide rail abuts against the support plate, and the transmission gears abut against the transmission motor. The transmission motor and support plate are detachably connected to the base. Oil pumps are detachably connected to both ends of the top of the base. An oil tank is embedded in the base, and a lubricating oil filter is detachably connected to the middle of the oil tank. A connecting seat is fixedly connected to the bottom of the connecting plate, and rollers rotate at equal intervals on the top of the connecting plate.

[0004] However, it still has the following drawbacks in practical use:

[0005] The aforementioned rotary kiln bottom support and positioning device for producing zinc ingots based on zinc-containing solid waste is used to fix the support plate to the base by detachable fixing bolts. However, this method is cumbersome and time-consuming to install and disassemble, resulting in low work efficiency.

[0006] When the rotary kiln body of the rotary kiln bottom support positioning device for producing zinc ingots based on zinc-containing solid waste needs to be lengthened and connected with the rotary kiln body on the other side, it is generally installed and sealed by flange and fixing bolts. However, this method of installation and disassembly is cumbersome, time-consuming and labor-intensive, resulting in low work efficiency.

[0007] The aforementioned rotary kiln bottom support positioning device for producing zinc ingots based on zinc-containing solid waste is used in which the support plate is fixed to the base with bolts. However, this method is not convenient for workers to adjust the position of the support plate, making it impossible to make corresponding adjustments according to the length of the rotary kiln body. Summary of the Invention

[0008] The purpose of this invention is to provide a rotary kiln device for the harmless treatment of wet zinc smelting slag. By utilizing a limiting component, it facilitates the quick installation and disassembly of the support plate by the operator, saving time and increasing work efficiency. At the same time, the docking component can realize or eliminate the limiting effect between the support plate and the fixing ring on the outer wall of the rotary kiln body, facilitating the quick and sealed docking and installation of the rotary kiln body on both sides, resulting in high work efficiency. Furthermore, the position of the upper support plate can be adjusted by the adjusting component, which is convenient for adjustment according to the length of the rotary kiln body and the position of the retaining ring set on it, thus increasing the applicability.

[0009] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0010] This invention relates to a rotary kiln device for the harmless treatment of wet zinc smelting slag, comprising a base, with adjusting grooves on both sides of the upper surface of the base. A first motor is mounted on one side of the upper surface of the base, and a gear plate is mounted on the output shaft of the first motor. An adjusting assembly is installed inside the adjusting grooves, comprising a second motor and a threaded rod. The output shaft of the second motor passes through a bearing on the outer wall of the adjusting groove and is connected to the threaded rod via a coupling. The other end of the threaded rod passes through a threaded hole on one end face of a moving block and is connected to a bearing on the inner wall of the adjusting groove. A mounting plate is welded to the upper surface of the moving block. Limiting components are provided at the four corners of the upper surface of the mounting plate, each limiting component comprising a limiting cylinder and a support ring. A support ring is welded to the bottom of the outer wall of the limiting cylinder, and the bottom end of the limiting cylinder is welded to the upper surface of the mounting plate. A limiting ring is welded to the upper part of the outer wall of the limiting cylinder. A docking assembly is provided on the upper part of the outer side of both sides of the base. The docking assembly includes a support plate and a hydraulic cylinder. A hydraulic cylinder is installed at both the front and rear ends of one side of the outer wall of the support plate. The hydraulic cylinder is installed inside the base. The bottom of the support plate is installed on the track. A docking frame is welded to the upper surface of the support plate. The external thread on the outer wall of the threaded rod meshes with the internal thread in the threaded hole on the end face of the moving block, which plays a role in transmission. The support ring and the limiting ring are both fixed on the outer wall of the limiting cylinder. When the hydraulic cylinder pushes the support plate, the support plate can slide under the action of the track.

[0011] Furthermore, a gear ring is provided directly above the gear disc, and the gear ring is fitted at the center of the outer wall of the rotary kiln body. Snap rings are fitted on both sides of the outer wall of the rotary kiln body. The gears on the outer wall of the gear disc mesh with the gears on the outer wall of the gear ring to achieve transmission. The cross-section of the snap ring is U-shaped.

[0012] Furthermore, fixing rings are welded to both sides of the outer wall of the rotary kiln body. A support plate is installed at the bottom of the inner side of the retaining ring. Auxiliary rollers are evenly spaced along the arc direction on the inner side wall of the support plate. The inner dimension of the retaining ring is larger than the width of the support plate. The outer wall of the auxiliary rollers contacts the inner wall of the retaining ring and can play an auxiliary role in rotating the rotary kiln body.

[0013] Furthermore, a first oil groove is provided at the top of the inside of the support plate, and a second oil groove is provided at the bottom of the inside of the support plate. The first oil groove is arc-shaped, and oil can be introduced into both ends of the first oil groove through external oil conveying equipment.

[0014] Furthermore, the first oil tank and the second oil tank are interconnected, and the bottom of the support plate is installed on the upper surface of the mounting plate. The oil in the first oil tank can drip into the second oil tank, and then be filtered and returned to the external oil conveying equipment.

[0015] Furthermore, a first airbag is fitted directly above the support ring, and a second airbag is fitted on the outer side of the outer wall of the limiting ring. A first air tube is provided at the center of the inner side wall of the first airbag. The support ring and the limiting ring respectively support and limit the first airbag and the second airbag.

[0016] Furthermore, the other end of the first air tube penetrates the outer wall of the limiting cylinder and is connected to the connecting pipe through a pipe joint. The other end of the connecting pipe is connected to the second air tube through a pipe joint. The other end of the second air tube penetrates the inner wall of the limiting cylinder and is located on the inner wall of the second airbag. The pipe joint serves as a pipe connection.

[0017] Furthermore, the center of the inner wall of the mating frame is connected to the spacer ring via a bearing. Sealing rings are bonded to both outer walls of the spacer ring. U-shaped frames are welded to both sides of the front and rear end faces of the mating frame. The spacer ring can rotate under the action of the bearing, and the sealing rings can improve the sealing performance of the connection.

[0018] Furthermore, a rotating shaft is installed in the bearings on adjacent end faces inside the U-shaped frame. A clamping plate is fitted on the outer side of the outer wall of the rotating shaft. One side of the outer wall of the clamping plate is connected to the electric telescopic rod through a hinge. The other end of the electric telescopic rod is connected to the inner wall of the U-shaped frame through a hinge. When the clamping plate is under force, it will rotate around the rotating shaft as the center.

[0019] The present invention has the following beneficial effects:

[0020] This invention, by setting a limiting component, allows the gas inside the first and second airbags to circulate under the action of the first air pipe, the second air pipe, and the connecting pipe. This facilitates quick installation and disassembly of the support plate by workers, saving time and increasing work efficiency. It solves the problem that the aforementioned rotary kiln bottom support positioning device for producing zinc ingots based on zinc-containing solid waste fixes the support plate to the base with detachable fixing bolts, which is cumbersome, time-consuming, and labor-intensive for workers during installation and disassembly, resulting in low work efficiency.

[0021] This invention, by setting up a docking assembly, drives the clamping plate to rotate around the pivot point under the extension and retraction of the electric telescopic rod. This achieves or eliminates the limiting effect between the clamping plate and the fixing ring on the outer wall of the rotary kiln body, facilitating the quick and easy sealing and docking installation of the rotary kiln bodies on both sides. This results in high work efficiency and solves the problem of low work efficiency caused by the conventional method of using flanges and fixing bolts for sealing and docking when the rotary kiln body needs to be extended to dock with the other side of the rotary kiln body in the production of zinc ingots based on zinc-containing solid waste. This method involves cumbersome installation and disassembly steps, is time-consuming and labor-intensive.

[0022] This invention, by setting an adjustment component, allows the first motor to drive the moving block to move under the action of threaded transmission, thereby adjusting the position of the upper support plate. This facilitates adjustment based on the length of the rotary kiln body and the position of the retaining ring set on it, increasing the applicability range. It solves the problem that in the above-mentioned rotary kiln bottom support positioning device based on zinc-containing solid waste to produce zinc ingots, the support plate is fixed to the base with bolts, which is inconvenient for operators to adjust the position of the support plate, resulting in the inability to make corresponding adjustments according to the length of the rotary kiln body. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural diagram of a rotary kiln equipment for the harmless treatment of wet zinc smelting slag.

[0025] Figure 2 This is a structural diagram of the base and the rotary kiln body;

[0026] Figure 3 This is a structural diagram of the base;

[0027] Figure 4 This is a sectional view of the support plate;

[0028] Figure 5 To adjust the structural diagram of the components;

[0029] Figure 6 This is a disassembled diagram of the limit component;

[0030] Figure 7 This is a structural diagram of the docking components;

[0031] Figure 8 This is a structural diagram of a U-shaped frame.

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 1. Base; 101. Adjusting groove; 102. First motor; 103. Gear disc; 104. Rotary kiln body; 1041. Gear ring; 1042. Snap ring; 1043. Fixing ring; 105. Support plate; 1051. Auxiliary roller; 1052. First oil groove; 1053. Second oil groove; 2. Adjusting assembly; 201. Second motor; 202. Threaded rod; 203. Moving block; 204. Mounting plate; 3. Limiting assembly 301. Limiting cylinder; 302. Support ring; 303. Limiting ring; 304. First airbag; 3041. First air pipe; 305. Second airbag; 3051. Second air pipe; 306. Connecting pipe; 4. Docking assembly; 401. Support plate; 402. Hydraulic cylinder; 403. Docking frame; 404. Spacer ring; 405. Sealing ring; 406. U-shaped frame; 407. Rotating shaft; 408. Clamping plate; 409. Electric telescopic rod. Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0035] Please see Figures 1 to 8As shown, this invention is a rotary kiln device for the harmless treatment of wet zinc smelting slag, including a base 1. Adjustment grooves 101 are provided on both sides of the upper surface of the base 1. A first motor 102 is installed on one side of the upper surface of the base 1, and a gear disc 103 is installed on the output shaft of the first motor 102. An adjustment assembly 2 is provided inside the adjustment grooves 101. The adjustment assembly 2 includes a second motor 201 and a threaded rod 202. The output shaft of the second motor 201 passes through a bearing on the outer wall of the adjustment groove 101 and is connected to the threaded rod 202 via a coupling. The other end of the threaded rod 202 passes through a threaded hole on one end face of a moving block 203 and is connected to a bearing on the inner wall of the adjustment groove 101. An mounting plate 204 is welded to the upper surface of the moving block 203. Limiting components 3 are provided at the four corners of the upper surface of the mounting plate 204. The limiting components 3 include a limiting cylinder 301 and a support ring 302. A support ring 302 is welded to the bottom of the outer wall of the cylinder 301. The bottom end of the limiting cylinder 301 is welded to the upper surface of the mounting plate 204. A limiting ring 303 is welded to the upper part of the outer wall of the limiting cylinder 301. A docking assembly 4 is provided on the upper part of the outer side of both sides of the base 1. The docking assembly 4 includes a support plate 401 and a hydraulic cylinder 402. A hydraulic cylinder 402 is installed at both the front and rear ends of one side of the outer wall of the support plate 401. The hydraulic cylinder 402 is installed inside the base 1. The bottom of the support plate 401 is installed on the track. A docking frame 403 is welded to the upper surface of the support plate 401. The external thread on the outer wall of the threaded rod 202 meshes with the internal thread in the threaded hole on the end face of the moving block 203, which plays a role in transmission. The support ring 302 and the limiting ring 303 are both fixed on the outer wall of the limiting cylinder 301. When the hydraulic cylinder 402 pushes the support plate 401, the support plate 401 can slide under the action of the track.

[0036] Among them, such as Figures 1 to 4As shown, a gear ring 1041 is positioned directly above the gear disc 103, and the gear ring 1041 is fitted around the center of the outer wall of the rotary kiln body 104. Retaining rings 1042 are fitted on both sides of the outer wall of the rotary kiln body 104. The gears on the outer wall of the gear disc 103 mesh with the gears on the outer wall of the gear ring 1041, providing a transmission function. The retaining ring 1042 has a U-shaped cross-section. Fixing rings 1043 are welded to the edges of both sides of the outer wall of the rotary kiln body 104. A support plate 105 is installed at the bottom of the inner side of the retaining ring 1042. Auxiliary rollers 1051 are evenly spaced along the arc direction on the inner sidewall of the support plate 105. The internal dimensions of the retaining ring 1042 are larger than the width of the support plate 105. The outer wall of the auxiliary roller 1051 contacts the inner wall of the retaining ring 1042 and can assist the rotation of the rotary kiln body 104. The top of the support plate 105 is provided with a first oil groove 1052 and the bottom of the support plate 105 is provided with a second oil groove 1053. The first oil groove 1052 is arc-shaped and oil can be introduced into the two ends of the first oil groove 1052 through external oil conveying equipment. The first oil groove 1052 and the second oil groove 1053 are interconnected. The bottom of the support plate 105 is installed on the upper surface of the mounting plate 204. The oil in the first oil groove 1052 can drip into the second oil groove 1053, and then be filtered and returned to the external oil conveying equipment.

[0037] Among them, such as Figure 2 , 5 As shown in Figure 6, a first airbag 304 is fitted directly above the support ring 302, and a second airbag 305 is fitted on the outer side of the outer wall of the limiting ring 303. A first air tube 3041 is provided at the center of the inner side wall of the first airbag 304. The support ring 302 and the limiting ring 303 provide support and limit for the first airbag 304 and the second airbag 305, respectively. The other end of the first air tube 3041 passes through the outer wall of the limiting cylinder 301 and is connected to the connecting pipe 306 through a pipe joint. The other end of the connecting pipe 306 is connected to the second air tube 3051 through a pipe joint. The other end of the second air tube 3051 passes through the inner wall of the limiting cylinder 301 and is located on the inner wall of the second airbag 305. The pipe joint serves as a pipe connection.

[0038] Among them, such as Figure 1 , 7As shown in Figure 8, the center of the inner wall of the docking frame 403 is connected to the spacer ring 404 via a bearing. Sealing rings 405 are bonded to both outer walls of the spacer ring 404. U-shaped frames 406 are welded to both ends of the front and rear end faces of the docking frame 403. The spacer ring 404 can rotate under the action of the bearing. The sealing rings 405 can improve the sealing of the connection. A rotating shaft 407 is installed in the bearing of the adjacent end face inside the U-shaped frame 406. A clamping plate 408 is sleeved on the outer side of the outer wall of the rotating shaft 407. One side of the outer wall of the clamping plate 408 is connected to the electric telescopic rod 409 via a hinge. The other end of the electric telescopic rod 409 is connected to the inner wall of the U-shaped frame 406 via a hinge. When the clamping plate 408 is under force, it will rotate around the rotating shaft 407 as the center.

[0039] A specific application of this embodiment is as follows: When workers need to use rotary kiln equipment to harmlessly treat zinc-containing leaching residue generated during the wet zinc smelting process, zinc-containing leaching residue is fed into the rotary kiln body 104 through an external feeding device. The zinc content is then extracted, and the waste residue and waste gas are treated by the processing equipment. When the rotary kiln body 104 rotates, the first motor 102 is started. The output shaft of the first motor 102 rotates, driving the gear disk 103 to rotate. The gears on the outer wall of the gear disk 103 mesh with the gears on the outer wall of the gear ring 1041. Therefore, when the gear disk 103 rotates, it drives the gear ring 1041 to rotate, causing the rotary kiln body 104 to rotate. Because the retaining rings 1042 on both sides of the outer wall of the rotary kiln body 104 are internally equipped with… The support plate 105 has multiple auxiliary rollers 1051 on its inner sidewall in contact with the inner wall of the retaining ring 1042. Therefore, when the rotary kiln body 104 rotates, it will rotate with the assistance of the auxiliary rollers 1051. Since the support plate 105 has a first oil groove 1052 and a second oil groove 1053 inside, lubricating oil can be input from both ends of the first oil groove 1052 through an external oil conveying device. After wetting the multiple auxiliary rollers 1051, the lubricating oil is discharged from the second oil groove 1053, filtered, and returned to the external oil conveying device, improving the stability and efficiency of the rotary kiln body 104's rotation. When the rotary kiln body 104 and support plate 105 need to be disassembled for maintenance, the rotary kiln body 104 is directly removed, and then the support plate 105 is pulled upwards. The support plate 105 is then subjected to force... The first airbag 304 is compressed upwards and squeezed. At this time, the gas inside the second airbag 305, under pressure, enters the first airbag 304 through the second air pipe 3051, connecting pipe 306, and first air pipe 3041, causing the second airbag 305 to shrink in volume and its limiting effect on the surface of the support plate 105 to disappear. Thus, the support plate 105 can be removed. When installing the support plate 105, align the through hole on the support plate 105 with the limiting cylinder 301 and insert it. Then, compress the first airbag 304 downwards. The gas inside the first airbag 304 is compressed and enters the second airbag 305 through the first air pipe 3041, connecting pipe 306, and second air pipe 3051. At this time, the first airbag 304 shrinks while the second airbag 305 expands. As plate 105 moves downward, the expanding second air bladder 305 limits its position on the surface of support plate 105, completing the installation of support plate 105. Then, the rotary kiln body 104 is placed on the two support plates 105. When it is necessary to support and assist the rotation of rotary kiln bodies 104 of different lengths, the second motor 201 is started. The output shaft of the second motor 201 rotates, driving the threaded rod 202 to rotate via a coupling. The external thread on the outer wall of the threaded rod 202 engages with the internal thread in the threaded hole on the end face of the moving block 203. Therefore, when the threaded rod 202 rotates, it drives the moving block 203 to move laterally, thereby adjusting the lateral position of the mounting plate 204 and achieving the purpose of adjusting the position of support plate 105.Furthermore, the position of the retaining ring 1042 on the outer wall of the rotary kiln body 104 can be adjusted according to different lengths. After the rotary kiln body 104 is placed, multiple rotary kiln bodies 104 usually need to be docked. At this time, the electric telescopic rod 409 is activated first. The telescopic end of the electric telescopic rod 409 retracts and pulls the outer wall of the retaining plate 408 under the action of the hinge, so that the retaining plate 408 will rotate around the rotating shaft 407 as the center, thereby moving the retaining plate 408 out of the docking frame 403. Then, the hydraulic cylinder 402 is activated. The hydraulic cylinder 402 operates and retracts to pull the support plate 401. The support plate 401 is subjected to force and slides inward under the action of the bottom track, driving the docking frame 403 to move. The movement of the docking frame 403 will lock the outer wall of the rotary kiln body 104 into its interior, and The rotary kiln body 104 is brought into contact with the sealing ring 405 on the outer wall of the partition ring 404 to achieve a sealing effect. Then, the clamping plate 408 is pushed back to its initial position by the electric telescopic rod 409, allowing it to re-screw into the docking frame 403 under the action of the rotating shaft 407, thus limiting the movement of the fixing ring 1043 on the outer wall of the rotary kiln body 104. Similarly, the other rotary kiln body 104 is docked into the docking frame 403. When both rotary kiln bodies 104 rotate, their ends will be in close contact with the sealing ring 405 on the outer wall of the partition ring 404. Since the partition ring 404 is connected to the inner wall of the docking frame 403 via a bearing, both rotary kiln bodies 104 will rotate under the action of the partition ring 404 and the bearing.

[0040] The above are merely preferred embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present invention.

Claims

1. A rotary kiln apparatus for detoxifying treatment of wet zinc leach residue, comprising a base (1), characterised in that: The upper surface of the base (1) is provided with adjustment grooves (101) on both sides. A first motor (102) is installed on one side of the upper surface of the base (1). A gear plate (103) is installed on the output shaft of the first motor (102). An adjustment assembly (2) is provided inside the adjustment groove (101). The adjustment assembly (2) includes a second motor (201) and a threaded rod (202). The output shaft of the second motor (201) passes through a bearing on the outer wall of the adjustment groove (101) and is connected to the threaded rod (202) through a coupling. The other end of the threaded rod (202) passes through a threaded hole on one side end face of the moving block (203) and is connected to a bearing on the inner wall of the adjustment groove (101). An mounting plate (204) is welded to the upper surface of the moving block (203). Limiting components (3) are provided at the four corners of the upper surface of the mounting plate (204). The limiting components (3) include a limiting cylinder (301) and a support ring (302). The support ring (302) is welded to the bottom of the outer wall of the limiting cylinder (301). The bottom end of the limiting cylinder (301) is welded to the upper surface of the mounting plate (204). A limiting ring (303) is welded to the upper part of the outer wall of the limiting cylinder (301). A docking assembly (4) is provided on the upper outer side of both sides of the base (1). The docking assembly (4) includes a support plate (401) and a hydraulic cylinder (402). The hydraulic cylinder (402) is installed at both ends of the outer side of one side of the support plate (401). The hydraulic cylinder (402) is installed inside the base (1). The bottom of the support plate (401) is installed on a track. A docking frame (403) is welded to the upper surface of the support plate (401).

2. A rotary kiln apparatus for detoxifying treatment of wet zinc leach residue according to claim 1, characterised in that: A toothed ring (1041) is provided directly above the toothed disc (103). The toothed ring (1041) is fitted on the center of the outer wall of the rotary kiln body (104). A retaining ring (1042) is fitted on both sides of the outer wall of the rotary kiln body (104).

3. A rotary kiln apparatus for detoxifying treatment of wet zinc leach residue according to claim 2, characterised in that: Fixing rings (1043) are welded to both sides of the outer wall of the rotary kiln body (104). A support plate (105) is installed at the bottom of the inner side of the retaining ring (1042). Auxiliary rollers (1051) are evenly spaced along the arc direction on the inner side wall of the support plate (105).

4. A rotary kiln apparatus for detoxifying treatment of wet zinc leach residue according to claim 3, characterised in that: The support plate (105) has a first oil groove (1052) at its inner top and a second oil groove (1053) at its inner bottom.

5. A rotary kiln apparatus for detoxifying treatment of wet zinc leach residue according to claim 4, characterised in that: The first oil tank (1052) and the second oil tank (1053) are interconnected, and the bottom of the support plate (105) is mounted on the upper surface of the mounting plate (204).

6. A rotary kiln apparatus for detoxifying treatment of wet zinc leach residue according to claim 1, characterised in that: A first airbag (304) is fitted on the top of the support ring (302), and a second airbag (305) is fitted on the outer side of the outer wall of the limiting ring (303). A first air tube (3041) is provided at the center of the inner side wall of the first airbag (304).

7. The rotary kiln equipment for harmlessly treating hydrometallurgical zinc slag according to claim 6, characterized in that: The other end of the first air tube (3041) passes through the outer wall of the limiting cylinder (301) and is connected to the connecting pipe (306) through a pipe joint. The other end of the connecting pipe (306) is connected to the second air tube (3051) through a pipe joint. The other end of the second air tube (3051) passes through the inner wall of the limiting cylinder (301) and is disposed on the inner wall of the second airbag (305).

8. The rotary kiln equipment for harmlessly treating hydrometallurgical zinc slag according to claim 1, characterized in that: The inner wall center of the docking frame (403) is connected to the spacer ring (404) via a bearing. Sealing rings (405) are bonded to both outer walls of the spacer ring (404). U-shaped frames (406) are welded to both ends of the docking frame (403).

9. The rotary kiln equipment for harmlessly treating hydrometallurgical zinc slag according to claim 8, characterized in that: A rotating shaft (407) is installed in the bearings of adjacent end faces inside the U-shaped frame (406). A clamping plate (408) is sleeved on the outer side of the outer wall of the rotating shaft (407). One side of the outer wall of the clamping plate (408) is connected to the electric telescopic rod (409) by a hinge. The other end of the electric telescopic rod (409) is connected to the inner wall of the U-shaped frame (406) by a hinge.

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