A rotary calcining kiln and secondary aluminum dross calcination treatment process

Abstract

The application discloses a rotary calcining kiln, which specifically comprises a bottom plate, an electric rotary disc, a rotary calcining kiln and a supporting frame arranged outside the rotary calcining kiln, the bottom of the supporting frame is provided with a table plate, one end of the supporting frame is rotationally connected with the table plate, hydraulic rods are arranged at the top of the table plate on both sides of the supporting frame, the telescopic ends of the hydraulic rods are fixedly connected with the side surfaces of the supporting frame, one end of the rotary calcining kiln located at the connecting position of the supporting frame and the table plate is provided with a feeding cylinder, a feeding assembly is arranged on the feeding cylinder, a plurality of hydraulic cylinders are arranged at the top of the bottom plate, the top of the telescopic rod of each hydraulic cylinder is fixedly connected with the electric rotary disc, and a table plate is fixedly arranged at the top of the electric rotary disc. The application can resist high temperature to calcine aluminum ash, can reduce energy consumption during the calcining process, can guarantee the calcining quality and can improve the yield.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum ash calcination, in particular to a rotary calcination kiln and a secondary aluminum ash calcination treatment process. BACKGROUND

[0002] Aluminum ash has the dual characteristics of resource waste and environmental hazards. The harmful components in aluminum ash are mainly fluorinated salts, chlorinated salts and nitrides. A large amount of aluminum nitride in aluminum ash has typical high permeability and high activity, which can react with water at room temperature to generate toxic and harmful, strongly irritating gas emissions, which not only affects human health, but also causes air pollution. Chlorinated salts, fluorinated salts and heavy metals in aluminum ash have certain leaching toxicity, and these harmful elements entering the soil can easily cause soil salinization and groundwater pollution. The particle size of aluminum ash is extremely fine, and dust pollution can be caused during storage, transportation and processing.

[0003] Landfilling is a traditional method for treating aluminum ash. According to statistics, more than 90% of secondary aluminum ash is directly stacked or landfilled without treatment, and a part of it is treated by water washing and melting method. Landfilling method has low cost and does not require technical requirements, which is a traditional extensive treatment method and cannot fundamentally solve the problem. The water washing method has low efficiency, a set of processing process needs to consume a large amount of time, and the processing capacity of secondary aluminum ash is limited. In addition, the water washing method consumes a large amount of water, and the treatment of tail water after water washing consumes a large amount of energy. The melting method needs to consume coke, and the coke resources in China are limited, and some countries and regions are extremely short of coke. In addition, the coking process will produce a large amount of pollution. If clean energy is used, the production cost is relatively high. The existing technology has not realized the effective treatment and recycling of secondary aluminum ash, and cannot form a complete process chain and ecological chain. A large amount of waste gas and waste residue is still generated in the processing process, and the resource utilization degree of the waste gas and waste residue is low, which cannot bring additional value.

[0004] Therefore, a rotary calcination kiln and a secondary aluminum ash calcination treatment process are provided to solve the existing problems. SUMMARY

[0005] The purpose of the present application is to provide a rotary calcination kiln and a secondary aluminum ash calcination treatment process, which can withstand high temperature and calcine aluminum ash, while reducing energy consumption and ensuring calcination quality during calcination.

[0006] To achieve the above objectives, the technical solution of this invention patent is: a rotary calcining kiln, specifically comprising a bottom plate, an electric rotating disc, a main body of the rotary calcining kiln, and a support frame disposed outside the main body of the rotary calcining kiln. The support frame located at the top of the main body of the rotary calcining kiln is equipped with multiple pulleys slidably connected to the main body of the rotary calcining kiln. The support frame located at the bottom of the main body of the rotary calcining kiln is equipped with multiple rotating shafts abutting against the main body of the rotary calcining kiln. A drive motor is mounted on the support frame, and the output shaft of the drive motor is coaxially connected to one of the rotating shafts. The support frame has a platform at its bottom, and one end of the support frame is rotatably connected to the platform. Hydraulic rods are installed on the top of the platform on both sides of the support frame. The telescopic ends of the hydraulic rods are fixedly connected to the side of the support frame. A feed cylinder is installed at one end of the rotary calcining kiln body located at the connection between the support frame and the platform. A feeding assembly is installed on the feed cylinder. An air inlet is installed at the other end of the rotary calcining kiln body. Multiple hydraulic cylinders are installed on the top of the bottom plate. The top of the telescopic rods of the multiple hydraulic cylinders are fixedly connected to an electric rotating disk. A platform is fixedly installed on the top of the electric rotating disk.

[0007] Preferably, a fixing ring is provided at the end of the feed cylinder away from the support frame. The outer ring of the fixing ring has multiple annular grooves. The feeding assembly includes a first cylinder fixedly connected to the fixing ring and a second cylinder sleeved outside the first cylinder. The first cylinder has multiple annularly arranged through holes. Bolts that can be inserted into the grooves are threaded into the through holes. A lifting ring is provided on the first cylinder. A support plate extending towards the feeding assembly is provided on the support frame. A lifting motor is provided at the bottom of the support plate. A steel cable is provided on the output shaft of the lifting motor through a lifting wheel. The other end of the steel cable is fixedly connected to the lifting ring. A first connecting ring is provided at the connection between the first cylinder and the second cylinder. A second connecting ring is provided on the second cylinder to prevent the second cylinder from falling off the first cylinder. Multiple ball bearings are provided between the first connecting ring and the second connecting ring. A first high-temperature resistant layer is provided inside the first cylinder, and a second high-temperature resistant layer is provided inside the second cylinder.

[0008] Preferably, the inner diameter of the first material cylinder is greater than or equal to the inner diameter of the fixing ring, the inner diameter of the second material cylinder is greater than or equal to the inner diameter of the first material cylinder, and the end of the second material cylinder away from the first material cylinder is set as a tapered opening.

[0009] A secondary calcination process for aluminum ash in a rotary kiln specifically includes the following steps:

[0010] A1. The secondary aluminum ash after iron removal is crushed and ground in a ball mill so that the secondary aluminum ash is fully activated and has the conditions for combustion.

[0011] A2. Mixing the ash: Add quicklime, a fluorine-fixing agent, to the secondary aluminum ash powder obtained in step A1 and stir. The secondary aluminum ash content in the mixture of secondary aluminum ash and quicklime is 90-95%, and the quicklime content is 5-10%.

[0012] A3. Ignition: During the first run, hot aluminum ash from the rotary kiln is used to ignite the aluminum ash slag. During subsequent continuous operation of the kiln, aluminum ash slag in a self-combusting state in other furnaces can be used for ignition. At this time, the temperature inside the rotary kiln is 600-800℃.

[0013] A4. Denitrification: After the aluminum ash slag in the rotary calcining kiln is ignited, the furnace door is closed, oxygen is introduced, and the motor is turned on to drive the rotary calcining kiln to rotate. This causes the aluminum nitride (AlN) in the aluminum ash to undergo an oxidation reaction under high-temperature conditions. Under the set oxygen content and temperature process conditions, the nitrogen element in the aluminum ash is converted into nitrogen gas, and the remaining nitrogen element is converted into nitrogen (N). x O y The specific reaction equation is as follows:

[0014] 4AlN + 3O2 → 2Al2O3 + 2N2

[0015]

[0016] A5. Calcination time in rotary kiln: 6-8 hours;

[0017] A6. Cooling: The secondary aluminum ash after calcination and fluorine fixation is pushed out by a hydraulic rod and poured into a closed ash hopper through a discharge nozzle. A forklift is then used to pour it into a cold ash bucket for cooling.

[0018] A7. Packaging: The cooled clinker obtained in step A6 is fed into the hopper of the packaging machine through the discharge port of the cold ash bucket. After being automatically packaged according to specifications, it is stored in the warehouse for sale.

[0019] Preferably, the stirring time in step A2 is 15-20 minutes.

[0020] Preferably, the oxygen introduced in step A4 is produced by an oxygen generator, and the oxygen supply is controlled by adjusting the oxygen supply to ensure that the oxygen content in the rotary kiln is 12%-18%.

[0021] Preferably, the motor speed in step A4 is 20-40 r / min.

[0022] Preferably, the concentration of nitrogen oxides produced by the reaction in the finished product of step A4 is <35 mg / m³. 3 This concentration is lower than the national emission standard of 150 mg / m³. 3 The limit is set, and more than 95% of the nitrogen in the secondary aluminum ash is converted into nitrogen gas.

[0023] Preferably, the cold ash bucket used in step A6 adopts indirect cooling. The cold ash bucket wall has a double-layer design. The cooling water is in the jacket and does not come into contact with the hot ash. The hot ash exchanges heat with the cooling water through the bucket body. The end of the cold ash bucket can be quickly cooled to below 40-60°C, reaching the temperature at which it can be bagged.

[0024] Preferably, in step A6, a portion of the secondary aluminum ash after calcination and solidification can be left inside the rotary kiln to ignite the next batch of aluminum ash, depending on production needs. Alternatively, a portion of the aluminum ash can be transported to an adjacent rotary kiln for calcination treatment via a feeding assembly using an electric rotary table and hydraulic rod.

[0025] The beneficial effects of this invention patent are:

[0026] This invention patent uses a rotary calcining furnace for denitrification and fluorine fixation. During initial operation, secondary aluminum ash is pulverized, and the rotary calcining kiln is heated to 1100-1400℃. Oxygen is used to ignite the aluminum ash slag. In subsequent continuous operation, aluminum ash slag in a self-igniting state within the furnace can be used for ignition. Simultaneously, a drive motor rotates the rotating shaft, which in turn rotates the rotary calcining kiln. Because aluminum ash has a calorific value, it ignites and calcines under oxygen-assisted combustion. The entire device can maintain a temperature of approximately 1400℃. Apart from the normal operation of the drive motor, no auxiliary heating equipment is needed during the calcination process. After calcination, a certain amount of aluminum ash remains in the furnace. Adding new, cold aluminum ash allows for continued combustion and calcination, creating a continuous cycle that truly saves energy. For high-volume production, multiple rotary calcining kilns can be used. One rotary calcining kiln is equipped with a feeding assembly on its feed cylinder to feed the rotary calcining kiln... The kiln body and the bottom platform are set on top of the electric rotary table. After the first batch of aluminum ash is calcined, the electric rotary table is raised by a hydraulic cylinder. At the same time, the electric rotary table rotates slowly, so that the conical opening of the second material cylinder in the feeding assembly is aligned with the feed cylinder of the adjacent rotary kiln body. The hydraulic rod tilts the rotary kiln body containing aluminum ash, so that the hot aluminum ash is transported along the first and second material cylinders to the adjacent rotary kiln body for continued calcination. This saves energy and greatly increases output. A pulley is set at the top of the support frame to reduce the friction generated during the rotation of the entire device. Attached Figure Description

[0027] Fig. 1 This is a schematic diagram of the structure of the present invention patent;

[0028] Fig. 2 This is a structural schematic diagram from another perspective of the present invention patent;

[0029] Fig. 3 This is a schematic diagram of the cross-sectional structure of the feeding component of this invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] like Figs. 1-3 As shown, a rotary kiln specifically includes a bottom plate 1, an electric rotating disk 12, a rotary kiln body 3, and a support frame 14 disposed outside the rotary kiln body 3. The support frame 14 located at the top of the rotary kiln body 3 is characterized by having multiple pulleys 17 slidably connected to the rotary kiln body 3 inside each support frame 14; multiple rotating shafts 151 located at the bottom of the rotary kiln body 3 inside each support frame 14 abutting against the rotary kiln body 3; a drive motor 15 is mounted on the support frame 14, the output shaft of the drive motor 15 being coaxially connected to one of the rotating shafts 151; and a platform 13 is disposed at the bottom of the support frame 14. One end of the support frame 14 is rotatably connected to the platform 13. Hydraulic rods 16 are provided on the top of the platform 13 on both sides of the support frame 14. The telescopic ends of the hydraulic rods 16 are fixedly connected to the side of the support frame 14. A feed cylinder 31 is provided at one end of the rotary calcining kiln body 3 located at the connection between the support frame 14 and the platform 13. A feeding assembly 2 is provided on the feed cylinder 31. An air inlet 32 ​​is provided at the other end of the rotary calcining kiln body 3. Multiple hydraulic cylinders 11 are provided on the top of the bottom plate 1. The top of the telescopic rods of the multiple hydraulic cylinders 11 are fixedly connected to the electric rotating disk 12. The platform 13 is fixedly provided on the top of the electric rotating disk 12.

[0032] A fixing ring 33 is provided at the end of the feed cylinder 31 away from the support frame 14. The outer ring of the fixing ring 33 has multiple annular grooves 34. The feeding assembly 2 includes a first feed cylinder 21 fixedly connected to the fixing ring 33 and a second feed cylinder 22 sleeved outside the first feed cylinder 21. The first feed cylinder 21 has multiple annularly arranged through holes 211, and bolts 212 that can be inserted into the grooves 34 are threaded into the through holes 211. A lifting ring 23 is provided on the first feed cylinder 21. A support plate 18 extending towards the feeding assembly 2 is provided on the support frame 14. The bottom of the support plate 18... The unit is equipped with a hoisting motor 19. A steel cable 20 is mounted on the output shaft of the hoisting motor 19 via a hoisting wheel. The other end of the steel cable 20 is fixedly connected to a lifting ring 23. A first connecting ring 213 is provided at the connection between the first material cylinder 21 and the second material cylinder 22. A second connecting ring 222 is provided on the second material cylinder 22 to prevent the second material cylinder 22 from falling off the first material cylinder 21. A plurality of ball bearings 24 are provided between the first connecting ring 213 and the second connecting ring 222. A first high-temperature resistant layer 214 is provided inside the first material cylinder 21, and a second high-temperature resistant layer 221 is provided inside the second material cylinder 22.

[0033] The inner diameter of the first material cylinder 21 is greater than or equal to the inner diameter of the fixing ring 33, the inner diameter of the second material cylinder 22 is greater than or equal to the inner diameter of the first material cylinder 21, and the end of the second material cylinder 22 away from the first material cylinder 21 is set as a tapered opening 223.

[0034] A secondary calcination process for aluminum ash in a rotary kiln, characterized by the following specific process steps:

[0035] A1. The secondary aluminum ash after iron removal is crushed and ground in a ball mill so that the secondary aluminum ash is fully activated and has the conditions for combustion.

[0036] A2. Mixing the ash: Add quicklime, a fluorine-fixing agent, to the secondary aluminum ash powder obtained in step A1 and stir. The secondary aluminum ash content in the mixture of secondary aluminum ash and quicklime is 90-95%, and the quicklime content is 5-10%.

[0037] A3. Ignition: During the first run, hot aluminum ash from the rotary kiln is used to ignite the aluminum ash slag. During subsequent continuous operation of the kiln, aluminum ash slag in a self-combusting state in other furnaces can be used for ignition. At this time, the temperature inside the rotary kiln is 600-800℃.

[0038] A4. Denitrification: After the aluminum ash slag in the rotary calcining kiln is ignited, the furnace door is closed, oxygen is introduced, and the motor is turned on to drive the rotary calcining kiln to rotate. This causes the aluminum nitride (AlN) in the aluminum ash to undergo an oxidation reaction under high-temperature conditions. Under the set oxygen content and temperature process conditions, the nitrogen element in the aluminum ash is converted into nitrogen gas, and the remaining nitrogen element is converted into nitrogen (N). x O y The specific reaction equation is as follows:

[0039] 4AlN + 3O2 → 2Al2O3 + 2N2

[0040]

[0041] A5. Calcination time in rotary kiln: 6-8 hours;

[0042] A6. Cooling: The secondary aluminum ash after calcination and fluorine fixation is pushed out by a hydraulic rod and poured into a closed ash hopper from the feed cylinder. A forklift is then used to pour it into a cold ash bucket for cooling.

[0043] A7. Packaging: The cooled clinker obtained in step A6 is fed into the hopper of the packaging machine through the discharge port of the cold ash bucket. After being automatically packaged according to specifications, it is stored in the warehouse for sale.

[0044] The stirring time in step A2 is 15-20 minutes.

[0045] The oxygen introduced in step A4 is produced by an oxygen generator, and the oxygen supply is controlled by adjusting the oxygen supply to ensure that the oxygen content in the rotary kiln is 12%-18%.

[0046] In step A4, the motor speed is 20-40 r / min.

[0047] The concentration of nitrogen oxides produced by the reaction in the finished product of step A4 was found to be <35 mg / m³. 3 This concentration is lower than the national emission standard of 150 mg / m³. 3 The limit is set, and more than 95% of the nitrogen in the secondary aluminum ash is converted into nitrogen gas.

[0048] The cold ash bucket used in step A6 employs indirect cooling. The cold ash bucket has a double-layer design, with the cooling water in the jacket, which does not come into contact with the hot ash. The hot ash exchanges heat with the cooling water through the bucket body, and the end of the cold ash bucket can be quickly cooled to below 40-60℃, reaching the temperature suitable for bagging.

[0049] In step A6, the secondary aluminum ash after calcination and solidification can, depending on production needs, leave a portion inside the rotary kiln to ignite the next batch of aluminum ash, or, in conjunction with an electric rotary table and hydraulic rod, transport a portion of the aluminum ash through a feeding assembly to an adjacent rotary kiln for aluminum ash calcination.

[0050] During use, the entire device is installed on-site. The rotary calcining kiln is heated to 1500℃ and then heating is stopped. The drive motor is turned on, causing the entire rotary calcining kiln body to rotate. The aluminum ash to be calcined is fed into the rotary calcining kiln body through the external airflow channel from the feed hopper. The furnace cover is then closed. Typically, about 6 tons of aluminum ash can be calcined at a time. Oxygen is supplied to the rotary calcining kiln body through the air inlet by a blower. With the aid of oxygen, the aluminum ash in the rotary calcining kiln body begins to burn and calcinate. Calcination usually takes 6-8 hours. After calcination, the drive motor stops rotating, and the hydraulic rod is turned on. Under the action of the hydraulic rod, the entire rotary calcining kiln body slowly tilts, allowing the calcined aluminum ash to be poured out of the rotary calcining kiln body into a sealed ash hopper. Then, a forklift is used to pour it into a cold ash bucket for cooling and packaging.

[0051] Working Principle: This invention patent uses a rotary calcining furnace for denitrification and fluorine fixation. During initial operation, secondary aluminum ash is pulverized, and the main body of the rotary calcining kiln is heated to 1100-1400℃. Simultaneously, oxygen is used to ignite the aluminum ash slag. During subsequent continuous operation, aluminum ash slag in a self-igniting state within the furnace can be used for ignition. Simultaneously, the drive motor rotates the rotating shaft, causing the main body of the rotary calcining kiln to rotate. Since aluminum ash itself has a calcination value, it begins calcination under oxygen-assisted combustion. The entire device can maintain a temperature of approximately 1400℃. Apart from the normal operation of the drive motor, no auxiliary heating equipment is needed during the calcination process. After calcination, a certain amount of aluminum ash remains in the furnace. Adding new, cold aluminum ash allows for continued combustion and calcination, thus achieving energy savings. In cases of high production volume, where multiple rotary calcining kilns are used, one kiln is equipped with a feeding assembly on its feed cylinder to feed the rotary calcining kiln. The main body of the calcining kiln and the bottom platform are mounted on top of an electric rotary table. After the first batch of aluminum ash is calcined, the electric rotary table is raised by a hydraulic cylinder. Simultaneously, the electric rotary table slowly rotates, aligning the conical opening of the second feed cylinder in the feeding assembly with the feed cylinder of the adjacent rotary calcining kiln. A hydraulic rod tilts the rotary calcining kiln containing aluminum ash, allowing the hot aluminum ash to be transported along the first and second feed cylinders to the adjacent rotary calcining kiln for further calcination. This significantly increases output while saving energy. A pulley is installed at the top of the support frame to reduce friction during rotation. This invention has a simple structure, is easy to operate, can withstand high temperatures for calcining aluminum ash, and simultaneously reduces energy consumption while ensuring calcination quality and increasing output.

[0052] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A secondary calcination process for aluminum ash in a rotary kiln, characterized in that: Specifically, the process steps include the following: A1. The secondary aluminum ash after iron removal is crushed and ground in a ball mill so that the secondary aluminum ash is fully activated and has the conditions for combustion. A2. Mixing the ash: Add quicklime, a fluorine-fixing agent, to the secondary aluminum ash powder obtained in step A1 and stir. The secondary aluminum ash content in the mixture of secondary aluminum ash and quicklime is 90-95%, and the quicklime content is 5-10%. A3. Ignition: During the first run, hot aluminum ash from the rotary kiln is used to ignite the aluminum ash slag. During subsequent continuous operation of the kiln, aluminum ash slag in a self-combusting state in other furnaces can be used for ignition. At this time, the temperature inside the rotary kiln is 600-800℃. A4. Denitrification: After the aluminum ash slag in the rotary calcining kiln is ignited, the furnace door is closed, oxygen is introduced, and the motor is turned on to drive the rotary calcining kiln to rotate. This causes the aluminum nitride in the aluminum ash to undergo an oxidation reaction under high-temperature conditions. Under the set oxygen content and temperature process conditions, the nitrogen element in the aluminum ash is converted into nitrogen gas, and the remaining nitrogen element is converted into nitrogen (N). x O y The specific reaction equation is as follows: 4AlN + 3O2 → 2Al2O3 + 2N2 A5. Calcination time in rotary kiln: 6-8 hours; A6. Cooling: The secondary aluminum ash after calcination and fluorine fixation is pushed out by a hydraulic rod and poured into a closed ash hopper from the feed cylinder. A forklift is then used to pour it into a cold ash bucket for cooling. A7. Packaging: The cooled clinker obtained in step A6 is fed into the hopper of the packaging machine through the discharge port of the cold ash bucket. After being automatically packaged according to specifications, it is put into storage for sale. The rotary calcining kiln specifically includes a bottom plate (1), an electric rotating disk (12), a rotary calcining kiln body (3), and a support frame (14) set outside the rotary calcining kiln body (3). The support frame (14) located at the top of the rotary calcining kiln body (3) is equipped with multiple pulleys (17) that are slidably connected to the rotary calcining kiln body (3). The support frame (14) located at the bottom of the rotary calcining kiln body (3) is equipped with multiple rotating shafts (151) that abut against the rotary calcining kiln body (3). The bottom is provided with a platform (13), one end of the support frame (14) is rotatably connected to the platform (13), and the top of the platform (13) on both sides of the support frame (14) is provided with a hydraulic rod (16), the telescopic end of the hydraulic rod (16) is fixedly connected to the side of the support frame (14); the top of the bottom plate (1) is provided with multiple hydraulic cylinders (11), the top of the telescopic rods of the multiple hydraulic cylinders (11) is fixedly connected to the electric rotating disk (12), and the top of the electric rotating disk (12) is fixedly provided with a platform (13).

2. The secondary calcination treatment process for aluminum ash in a rotary kiln according to claim 1, characterized in that: The stirring time in step A2 is 15-20 minutes.

3. The secondary calcination treatment process for aluminum ash in a rotary kiln according to claim 1, characterized in that: The oxygen introduced in step A4 is produced by an oxygen generator, and the oxygen supply is controlled by adjusting the oxygen supply to ensure that the oxygen content in the rotary kiln is 12%-18%.

4. The secondary calcination treatment process for aluminum ash in a rotary kiln according to claim 1, characterized in that: In step A4, the motor speed is 20-40 r / min.

5. The secondary calcination treatment process for aluminum ash in a rotary kiln according to claim 1, characterized in that: The concentration of nitrogen oxides produced by the reaction in the finished product of step A4 was found to be <35 mg / m³. 3 This concentration is lower than the national emission standard of 150 mg / m³. 3 The limit is set, and more than 95% of the nitrogen in the secondary aluminum ash is converted into nitrogen gas.

6. The secondary calcination treatment process for aluminum ash in a rotary kiln according to claim 1, characterized in that: The cold ash bucket used in step A6 employs indirect cooling. The cold ash bucket has a double-layer design, with the cooling water in the jacket, which does not come into contact with the hot ash. The hot ash exchanges heat with the cooling water through the bucket body, and the end of the cold ash bucket can be quickly cooled to below 40-60℃, reaching the temperature suitable for bagging.

7. The secondary calcination treatment process for aluminum ash in a rotary kiln according to claim 1, characterized in that: In step A6, the secondary aluminum ash after calcination and solidification can, depending on production needs, leave a portion inside the rotary kiln to ignite the next batch of aluminum ash, or, in conjunction with an electric rotary table and hydraulic rod, transport a portion of the aluminum ash through a feeding assembly to an adjacent rotary kiln for aluminum ash calcination.

8. The secondary calcination treatment process for aluminum ash in a rotary kiln according to claim 1, characterized in that: A drive motor (15) is provided on the support frame (14). The output shaft of the drive motor (15) is coaxially connected to one of the rotating shafts (151). A feed cylinder (31) is provided at one end of the rotary calcining kiln body (3) located at the connection between the support frame (14) and the platform (13). A feeding assembly (2) is provided on the feed cylinder (31). An air inlet (32) is provided at the other end of the rotary calcining kiln body (3).

9. The secondary calcination treatment process for aluminum ash in a rotary kiln according to claim 8, characterized in that: A fixing ring (33) is provided at the end of the feed cylinder (31) away from the support frame (14). The outer ring of the fixing ring (33) has a plurality of annular grooves (34). The feeding assembly (2) includes a first material cylinder (21) fixedly connected to the fixing ring (33) and a second material cylinder (22) sleeved outside the first material cylinder (21). The first material cylinder (21) has a plurality of annularly arranged through holes (211). The through holes (211) are threaded with bolts (212) that can be inserted into the grooves (34). The first material cylinder (21) is provided with a lifting ring (23). The support frame (14) is provided with a support plate (18) extending toward the feeding assembly (2). A hoisting motor (19) is provided at the bottom. A steel cable (20) is provided on the output shaft of the hoisting motor (19) through a hoisting wheel. The other end of the steel cable (20) is fixedly connected to a lifting ring (23). A first connecting ring (213) is provided at the connection between the first material cylinder (21) and the second material cylinder (22). A second connecting ring (222) is provided on the second material cylinder (22) to prevent the second material cylinder (22) from falling off the first material cylinder (21). A plurality of balls (24) are provided between the first connecting ring (213) and the second connecting ring (222). A first high temperature resistant layer (214) is provided inside the first material cylinder (21), and a second high temperature resistant layer (221) is provided inside the second material cylinder (22).

10. The secondary calcination treatment process for aluminum ash in a rotary kiln according to claim 9, characterized in that: The inner diameter of the first material cylinder (21) is greater than or equal to the inner diameter of the fixing ring (33), the inner diameter of the second material cylinder (22) is greater than or equal to the inner diameter of the first material cylinder (21), and the end of the second material cylinder (22) away from the first material cylinder (21) is set as a tapered opening (223).

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