A secondary aluminum dross recycling and calcining production line

Abstract

The application relates to a secondary aluminum ash recycling and sintering production line, which comprises an aluminum ash sintering device, an aluminum ash discharging barrel, an aluminum ash cooling device and an aluminum ash combustion device. The aluminum ash sintering device comprises a combustion kiln main body, a combustion kiln secondary body, a first rotating mechanism and a second rotating mechanism. The aluminum ash cooling device comprises a cooling tank body and a third rotating mechanism. The two ends of the combustion kiln main body are respectively connected with the barrel opening of the combustion kiln secondary body and the aluminum ash discharging barrel. The inner wall of the aluminum ash discharging barrel is slidably connected with the outer wall of the combustion kiln main body. The aluminum ash outlet at the bottom of the aluminum ash discharging barrel is connected with the entering end of the cooling tank body. The flame spraying gun and the gas supply connecting pipe arranged on the aluminum ash combustion device are connected with each other. The flame spraying gun passes through the aluminum ash discharging barrel and is arranged in the combustion kiln main body. The tail end of the combustion kiln secondary body is used for inputting the secondary aluminum ash to be treated. The scheme provided by the application realizes comprehensive treatment and recycling of the secondary aluminum ash and avoids the secondary aluminum ash from polluting the environment.

Description

Technical Field

[0001] This application relates to the field of aluminum ash recycling technology, and in particular to a secondary aluminum ash recycling and firing production line. Background Technology

[0002] In recent years, with the widespread use of aluminum products, the demand for aluminum metal in various industries has been increasing, and aluminum metal production capacity has been climbing year by year. As a by-product of the aluminum smelting process, aluminum ash has also grown rapidly. Aluminum ash is a toxic and hazardous solid waste generated during the aluminum production process. The main components of aluminum ash include metallic aluminum, alumina, silicon oxide, magnesium oxide, iron oxide, chloride, and oxides. Traditional aluminum metal production enterprises mostly use stockpiling and landfilling to dispose of aluminum ash. Such disposal methods lead to the direct discharge of chlorides and fluorides in wastewater, polluting the environment. Furthermore, long-term stockpiling can easily cause deliquescence, producing ammonia gas with a pungent odor. At the same time, the metals in aluminum ash can cause irreversible pollution to the soil. Therefore, aluminum ash has been included in the "National Hazardous Waste List" and enterprises are prohibited from arbitrarily burying it.

[0003] Aluminum ash is further divided into primary aluminum ash and secondary aluminum ash. Primary aluminum ash has a higher content of metallic aluminum and alumina, and thus a higher recycling value. Recycling and reusing it not only reduces aluminum loss during aluminum production and improves the economic efficiency of the aluminum industry, but also achieves effective resource recycling. Secondary aluminum ash is the ash residue separated after primary aluminum ash has been recycled. Its main components are alumina, AlN (aluminum nitride), Al4C3 (basic aluminum carbonate), a small amount of metallic aluminum, and certain amounts of fluorides, NaCl (sodium chloride), KCl (potassium chloride), and SiO2 (silicon dioxide). Basic aluminum carbonate reacts with water to produce gases such as NH3 (ammonia) and CH4 (methane), emitting a foul odor. Fluorides and cyanides dissolve in water, polluting natural water bodies. Therefore, direct landfilling without treatment will cause serious environmental harm. Due to the complex composition of secondary aluminum ash and its low aluminum content, traditional enterprises mostly treat secondary aluminum ash with acid leaching, alkali leaching, and washing to remove impurities such as nitrides, fluorides, and salts before safely landfilling it. However, this method cannot achieve efficient utilization of aluminum ash and requires enterprises to bear the treatment costs, increasing their production costs.

[0004] For example, Chinese invention patent CN115074548A, entitled "A Secondary Aluminum Ash Denitrification Device," describes a device for denitrifying secondary aluminum ash to prevent nitrogen compounds in the ash from harming the environment. The device includes a ball mill chamber with an inlet and outlet in the center. A drive assembly is connected to the outside of the chamber, and rotating sleeves are located at both ends. A machine base is rotatably connected to the outer sides of each sleeve, and an air inlet assembly and an air outlet assembly are connected to the inner sides of the sleeves, respectively. Both the inlet and outlet assemblies include air pipes. The middle of the air pipe is connected to the rotating sleeve via a clamping assembly. The air pipe extends to the outside of the rotating sleeve and is fitted with a pressure plate. A first elastic element is located between the pressure plate and the rotating sleeve. A stepped portion is provided on the air pipe outside the pressure plate, with a drive unit connected to the end of the stepped portion and an air valve connected to the outside of the stepped portion. The device features a side-mounted air passage with a matching air valve, and a one-way valve within the passage is fitted with a matching drive unit. Through the structural cooperation of the rotating sleeves at both ends of the ball mill chamber and the air inlet and outlet components, high-temperature steam can be directly injected into the ball mill chamber from one end of the rotating sleeve via the air inlet component. This ensures that the secondary aluminum ash is in a high-temperature, high-pressure environment during the reaction, effectively improving heating efficiency compared to existing ball mill heating methods and achieving high-pressure conditions during the reaction, thus accelerating the reaction efficiency. Simultaneously, the ammonia gas generated during the reaction can be directly discharged through the outlet component, achieving the necessary air filling and exhaust functions. Although this device achieves denitrification of the secondary aluminum ash, preventing nitrogen compounds in the ash from harming the environment, the product cannot fully recycle and reuse the secondary aluminum ash. Therefore, the application scope of this device is relatively narrow and it is not suitable for widespread use.

[0005] Therefore, how to comprehensively process and recycle secondary aluminum ash is a technical problem that technicians need to solve. Summary of the Invention

[0006] To overcome the problems existing in related technologies, this application provides a secondary aluminum ash recycling and firing production line, which can regenerate and recycle toxic and harmful secondary aluminum ash, reduce the production cost of enterprises, and avoid secondary aluminum ash from polluting the environment.

[0007] To achieve the above objectives, this application provides a secondary aluminum ash recycling and calcining production line, comprising: an aluminum ash calcining device, an aluminum ash discharge bin, an aluminum ash cooling device, and an aluminum ash combustion device.

[0008] The aluminum ash calcination device includes a combustion kiln body, a combustion kiln sub-body, a first rotating mechanism, and a second rotating mechanism.

[0009] The aluminum ash cooling device includes a cooling tank and a third rotating mechanism. One end of the main body of the combustion kiln is connected to the secondary body of the combustion kiln. The opening of the aluminum ash discharge barrel is connected to the other end of the main body of the combustion kiln. The inner wall of the aluminum ash discharge barrel is slidably connected to the outer wall of the main body of the combustion kiln. The bottom of the aluminum ash discharge barrel is provided with an aluminum ash outlet, which is connected to the inlet end of the cooling tank.

[0010] The first rotating mechanism controls the rotation of the main body of the combustion kiln, the second rotating mechanism controls the rotation of the secondary body of the combustion kiln, and the rotation direction of the main body of the combustion kiln is opposite to the rotation direction of the secondary body of the combustion kiln; the third rotating mechanism controls the rotation of the cooling tank.

[0011] The aluminum ash combustion device includes a flame gun and a gas supply pipe. The flame gun is connected to the gas supply pipe, and the nozzle of the flame gun passes through the aluminum ash discharge hopper and is located inside the main body of the combustion kiln. The spray direction of the flame gun faces the end of the secondary body of the combustion kiln.

[0012] The end of the secondary combustion kiln is used to input secondary aluminum ash to be treated; the gas supply pipe is used to input combustible mixed gas; the slope of the main combustion kiln is less than or equal to 10%, and the slope of the main combustion kiln is equal to that of the secondary combustion kiln.

[0013] Preferably, the combustion kiln body includes a main kiln body and a main rotating gear. The main kiln body is fixed on the base circle of the main rotating gear, and the main rotating gear is located at the center of the main kiln body. The main rotating gear is meshed with the drive gear of the first rotating mechanism.

[0014] Preferably, the secondary combustion kiln includes a secondary kiln body, a secondary rotating gear, and a support wheel. The secondary kiln body is fixed at the base circle of the secondary rotating gear, and the secondary rotating gear is located at the center of the kiln body. The support wheel is arranged on both sides of the secondary rotating gear, and the central axis of the support wheel coincides with the central axis of the kiln body rotating gear. The second rotating mechanism includes a power gear and a balance pulley. The power gear is meshed with the kiln body rotating gear, and the balance pulley is tangent to the support wheel.

[0015] Preferably, the aluminum ash cooling device further includes a tank rotating gear, the cooling tank is fixed on the base circle of the tank rotating gear, and the tank rotating gear is located at the center of the cooling tank. The tank rotating gear is meshed with the drive gear of the third rotating mechanism.

[0016] Preferably, the combustion kiln body further includes a rotating bearing, which is disposed on both sides of the rotating gear of the main body, with one side of the rotating bearing located between the outer wall of the combustion kiln body and the inner wall of the aluminum ash discharge hopper, and the other side of the rotating bearing located between the outer wall of the combustion kiln body and the outer wall of the combustion kiln sub-body.

[0017] Preferably, it further includes a first exhaust gas treatment device, which includes a first bag filter mechanism and a first fan. The output end of the cooling tank is connected to the input end of the first bag filter mechanism, and the first fan is connected to the output end of the first bag filter mechanism through a conduit.

[0018] Preferably, the system further includes a second waste gas treatment device, which includes a second bag filter, a gravity filter, a cyclone filter, a denitrification tower, and a second fan. The output end of the gravity filter is connected to the input end of the combustion kiln body, the exhaust end of the gravity filter is connected to the input end of the cyclone filter, the output end of the cyclone filter is connected to the input end of the second bag filter, the output end of the second bag filter is connected to the input end of the denitrification tower, and the output end of the denitrification tower is connected to the second fan.

[0019] Preferably, it also includes a clinker silo, the input end of which is connected to the output end of the cooling tank, and the clinker silo is used to store secondary aluminum ash after recycling.

[0020] Preferably, it also includes a raw material silo, the output end of which is connected to the input end of the gravity dust removal mechanism, and the raw material silo is used to store secondary aluminum ash before regeneration.

[0021] The technical solution provided in this application may include the following beneficial effects:

[0022] In this technical solution, an aluminum ash calcination device, an aluminum ash discharge bin, an aluminum ash cooling device, and an aluminum ash combustion device are respectively installed on the recycling production line. The aluminum ash calcination device includes a combustion kiln body, a combustion kiln secondary body, a first rotating mechanism, and a second rotating mechanism. The aluminum ash cooling device is equipped with a cooling tank and a third rotating mechanism. One end of the combustion kiln body is connected to the combustion kiln secondary body, and the other end of the combustion kiln body is connected to the opening of the aluminum ash discharge bin. The inner wall of the aluminum ash discharge bin is slidably connected to the outer wall of the combustion kiln body. An aluminum ash outlet is provided at the bottom of the aluminum ash discharge bin and is connected to the inlet of the cooling tank. The rotation of the combustion kiln body is controlled by the first rotating mechanism, and the combustion kiln is controlled by the second rotating mechanism. The secondary body rotates, and the rotation direction of the main combustion kiln body is opposite to that of the secondary body. A third rotation mechanism controls the rotation of the cooling tank. The combustion device consists of a flame gun and a gas supply pipe. The flame gun is connected to the gas supply pipe, and the nozzle of the flame gun passes through the aluminum ash discharge bin and is positioned inside the main combustion kiln body. The flame gun's spray direction faces the end of the secondary body. The slope of the main combustion kiln body is 3%, and the slopes of the main combustion kiln body and the secondary body are equal. For example, when the production line is operating, the secondary aluminum ash to be processed is input from the end of the secondary body, and a combustible mixed gas is input through the gas supply pipe. The gas is sprayed out and burned through the flame gun in the main combustion kiln body, raising the temperature of the main combustion kiln body. The temperature of the secondary combustion chamber also rises accordingly. Since both the main combustion chamber and the secondary combustion chamber have a 3% slope, and the second rotating mechanism controls the rotation of the secondary combustion chamber, secondary aluminum ash can be transported within it. The secondary combustion chamber's temperature rises during transport, preheating the ash. Then, because the rotation direction of the main combustion chamber is opposite to that of the secondary combustion chamber, the secondary aluminum ash experiences uniform stirring and tumbling at the connection point. This allows the ash to spread evenly at this location, which is also close to the flame torch. By controlling the flame torch's combustion output, the evenly spread secondary aluminum ash can be calcined more efficiently, achieving its secondary... In the secondary aluminum ash, aluminum compounds such as metallic aluminum, aluminum nitride, and basic aluminum carbonate are oxidized to form aluminum oxide, while the nitrogen in the ash is reduced to nitrogen gas. Additionally, compounds such as fluorides in the secondary aluminum ash react with calcium salts added inside the combustion kiln to form non-toxic calcium salts, reducing harmful components in the secondary aluminum ash. Finally, after the secondary aluminum ash is calcined, it enters the aluminum ash discharge bin. Due to gravity, the secondary aluminum ash slides down the inner wall of the discharge bin and enters the cooling tank from the aluminum ash outlet at the bottom of the bin. A third rotating mechanism drives the cooling tank to rotate, rapidly cooling the regenerated secondary aluminum ash within the cooling tank. This achieves the recycling of secondary aluminum ash, reduces production costs for enterprises, and avoids environmental damage caused by secondary aluminum ash.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0024] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0025] Figure 1 This is a schematic diagram of the structure of a recycling production line shown in an embodiment of this application.

[0026] Figure 2 This is a schematic diagram of the aluminum ash calcination device and aluminum ash discharge bucket shown in the embodiments of this application.

[0027] Figure 3 This is a schematic diagram of the aluminum ash cooling device shown in the embodiments of this application.

[0028] Figure 4 This is a schematic diagram of the aluminum ash combustion device shown in the embodiments of this application.

[0029] In the diagram: 1. Aluminum ash calcination device; 10. Combustion kiln body; 101. Main kiln body; 102. Main rotating gear; 103. Rotating bearing; 11. Secondary kiln body; 111. Secondary kiln body; 112. Support wheel; 113. First rotating mechanism; 12. Second rotating mechanism; 13. Power gear; 131. Balance pulley; 132. Aluminum ash discharge bucket; 2. Aluminum ash outlet; 20. Aluminum ash cooling device; 3. Cooling tank; 30. Third rotating mechanism; 31. Tank rotating gear; 32. Aluminum ash combustion device; 4. Flame torch; 40. Gas supply pipe; 41. First waste gas treatment device; 5. First bag filter dust collector; 50. First fan; 51. Second waste gas treatment device; 6. Second bag filter dust collector; 60. Gravity dust collector; 61. Cyclone dust collector; 62. Denitrification tower; 63. Second fan; 64. Clinker silo; 8. Raw material silo. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application. The preferred embodiments of this application will now be described in more detail with reference to the accompanying drawings. Although preferred embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0031] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] In the description of this application, it should be understood that the terms "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] Technical background: Traditional enterprises mostly treat secondary aluminum ash by acid leaching, alkali leaching, and washing to remove impurities such as nitrides, fluorides, and salts, and then safely landfill the ash. However, this method cannot achieve efficient utilization of aluminum ash, and enterprises have to bear the processing costs, which increases their production costs.

[0037] To address the aforementioned issues, this application provides a secondary aluminum ash recycling and firing production line. This production line can regenerate and recycle secondary aluminum ash, reducing production costs for enterprises while avoiding environmental pollution caused by secondary aluminum ash.

[0038] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0039] Figure 1 This is a schematic diagram of the structure of a recycling production line shown in an embodiment of this application.

[0040] Figure 2 This is a schematic diagram of the aluminum ash calcination device and aluminum ash discharge bucket shown in the embodiments of this application.

[0041] Figure 3 This is a schematic diagram of the aluminum ash cooling device shown in the embodiments of this application.

[0042] Figure 4 This is a schematic diagram of the aluminum ash combustion device shown in the embodiments of this application.

[0043] See Figures 1 to 4 The secondary aluminum ash recycling and calcining production line includes: aluminum ash calcining device 1, aluminum ash discharge barrel 2, aluminum ash cooling device 3, and aluminum ash combustion device 4.

[0044] The aluminum ash calcination device 1 includes a combustion kiln main body 10, a combustion kiln secondary body 11, a first rotating mechanism 12, and a second rotating mechanism 13.

[0045] The aluminum ash cooling device 3 includes a cooling tank 30 and a third rotating mechanism 31. One end of the combustion kiln body 10 is connected to the combustion kiln secondary body 11. The opening of the aluminum ash discharge barrel 2 is connected to the other end of the combustion kiln body 10. The inner wall of the aluminum ash discharge barrel 2 is slidably connected to the outer wall of the combustion kiln body 10. The bottom of the aluminum ash discharge barrel 2 is provided with an aluminum ash outlet 20, which is connected to the inlet end of the cooling tank 30.

[0046] The first rotating mechanism 12 controls the rotation of the combustion kiln body 10, the second rotating mechanism 13 controls the rotation of the combustion kiln secondary body 11, and the rotation direction of the combustion kiln body 10 is opposite to the rotation direction of the combustion kiln secondary body 11. The third rotating mechanism 31 controls the rotation of the cooling tank 30.

[0047] The aluminum ash combustion device includes a flame gun 40 and a gas supply pipe 41. The flame gun 40 is connected to the gas supply pipe 41, and the nozzle of the flame gun 40 passes through the aluminum ash discharge bucket 2 and is located inside the combustion kiln body 10. The spray direction of the flame gun 40 faces the end of the combustion kiln body 11.

[0048] The end of the secondary combustion kiln body 11 is used to input secondary aluminum ash to be processed; the gas supply pipe 41 is used to input combustible mixed gas; the slope of the main combustion kiln body 10 is less than or equal to 10%, and the slope of the main combustion kiln body 10 is equal to that of the secondary combustion kiln body 11.

[0049] Specifically, the combustion kiln body 10 includes a main kiln body 101 and a main rotating gear 102. The main kiln body 101 is fixed on the base circle of the main rotating gear 102, and the main rotating gear 102 is located at the center of the main kiln body 101. The main rotating gear 102 is meshed with the drive gear of the first rotating mechanism 12.

[0050] Specifically, the secondary combustion kiln 11 includes a secondary kiln body 111, a secondary rotating gear 112, and a support wheel 113. The secondary kiln body 111 is fixed at the base circle of the secondary rotating gear 112, and the secondary rotating gear 112 is located at the center of the kiln body. The support wheel 113 is arranged on both sides of the secondary rotating gear 112, and the central axis of the support wheel 113 coincides with the central axis of the kiln body rotating gear. The second rotating mechanism 13 includes a power gear 131 and a balance pulley 132. The power gear 131 is meshed with the kiln body rotating gear, and the balance pulley 132 is externally tangent to the support wheel 113.

[0051] Specifically, the aluminum ash cooling device 3 further includes a tank rotation gear 32, the cooling tank 30 is fixed on the base circle of the tank rotation gear 32, and the tank rotation gear 32 is located at the center of the cooling tank 30. The tank rotation gear 32 is meshed with the drive gear of the third rotation mechanism 31.

[0052] Specifically, the combustion kiln body 10 also includes a rotating bearing 103, which is disposed on both sides of the main rotating gear 102. One side of the rotating bearing 103 is located between the outer wall of the combustion kiln body 10 and the inner wall of the aluminum ash discharge bucket 2, while the other side of the rotating bearing 103 is located between the outer wall of the combustion kiln body 10 and the outer wall of the combustion kiln secondary body 11.

[0053] Specifically, it also includes a first exhaust gas treatment device 5, which includes a first bag filter mechanism 50 and a first fan 51. The output end of the cooling tank 30 is connected to the input end of the first bag filter mechanism 50, and the first fan 51 is connected to the output end of the first bag filter mechanism 50 through a conduit.

[0054] Specifically, it also includes a second waste gas treatment device 6, which includes a second bag filter 60, a gravity dust collector 61, a cyclone dust collector 62, a denitrification tower 63, and a second fan 64. The output end of the gravity dust collector 61 is connected to the input end of the combustion kiln secondary body 11, the exhaust end of the gravity dust collector 61 is connected to the input end of the cyclone dust collector 62, the output end of the cyclone dust collector 62 is connected to the input end of the second bag filter 60, the output end of the second bag filter 60 is connected to the input end of the denitrification tower 63, and the output end of the denitrification tower 63 is connected to the second fan 64.

[0055] Specifically, it also includes a clinker silo 7, the input end of which is connected to the output end of the cooling tank 30, and the clinker silo 7 is used to store secondary aluminum ash after recycling.

[0056] Specifically, it also includes a raw material silo 8, the output end of which is connected to the input end of the gravity dust removal mechanism 61, and the raw material silo 8 is used to store secondary aluminum ash before regeneration.

[0057] Example 1

[0058] In this embodiment, to achieve the recycling of secondary aluminum ash, a secondary aluminum ash recycling and calcining production line is provided. The production line is equipped with an aluminum ash calcining device, an aluminum ash discharge bin, an aluminum ash cooling device, and an aluminum ash combustion device. The aluminum ash calcining device includes a combustion kiln body, a secondary combustion kiln body, a first rotating mechanism, and a second rotating mechanism. The aluminum ash cooling device is equipped with a cooling tank and a third rotating mechanism. One end of the combustion kiln body is connected to the secondary combustion kiln body, and the other end of the combustion kiln body is connected to the opening of the aluminum ash discharge bin. The inner wall of the aluminum ash discharge bin is slidably connected to the outer wall of the combustion kiln body. An aluminum ash discharge bin is placed at the bottom of the aluminum ash discharge bin. The ash outlet is connected to the inlet of the cooling tank. The rotation of the main body of the combustion kiln is controlled by the first rotating mechanism, the rotation of the secondary body of the combustion kiln is controlled by the second rotating mechanism, and the rotation direction of the main body of the combustion kiln is opposite to that of the secondary body of the combustion kiln. The rotation of the cooling tank is controlled by the third rotating mechanism. The combustion device consists of a flame gun and a gas supply pipe. The flame gun is connected to the gas supply pipe, and the nozzle of the flame gun passes through the aluminum ash discharge bucket and is set inside the main body of the combustion kiln. The spray direction of the flame gun faces the end of the secondary body of the combustion kiln. The slope of the main body of the combustion kiln is 3%, and the slopes of the main body of the combustion kiln and the secondary body of the combustion kiln are equal.

[0059] For example, when the production line is operating, the secondary aluminum ash to be processed is input from the end of the secondary combustion kiln. A combustible mixture is supplied through the gas supply pipe. The gas is then sprayed through a flame torch into the main combustion kiln, causing the temperature of the main combustion kiln to rise. Simultaneously, the temperature of the secondary combustion kiln also rises. Since both the main and secondary combustion kilns have a 3% slope, and the second rotating mechanism controls the rotation of the secondary combustion kiln, the secondary aluminum ash can be transported within it. The secondary combustion kiln's temperature rise during transport preheats the ash. Because the rotation direction of the main combustion kiln is opposite to that of the secondary combustion kiln, the secondary aluminum ash experiences uniform stirring and tumbling at the connection point between the two, allowing it to spread evenly. This location is also close to the flame torch. By controlling the combustion spray volume of the flame torch, the secondary aluminum ash evenly spread during mixing can be roasted more efficiently. This oxidizes aluminum compounds such as metallic aluminum, aluminum nitride, and basic aluminum carbonate in the secondary aluminum ash to form aluminum oxide, while reducing nitrogen to nitrogen gas. In addition, compounds such as fluorides in the secondary aluminum ash react with calcium salts added in the combustion kiln to form non-toxic calcium salts, reducing harmful components in the secondary aluminum ash. Finally, the roasted secondary aluminum ash enters the aluminum ash discharge hopper. Due to gravity, the secondary aluminum ash slides down the inner wall of the discharge hopper and enters the cooling tank from the aluminum ash outlet at the bottom of the discharge hopper. The cooling tank is driven by a third rotating mechanism to rotate, allowing the regenerated secondary aluminum ash to be rapidly cooled in the cooling tank, realizing the recycling of secondary aluminum ash, reducing the company's production costs, and avoiding the environmental damage caused by secondary aluminum ash.

[0060] In addition, the gas supply pipe can control the flame temperature of the flame gun by adjusting the supply volume of the mixed gas, thereby controlling the temperature inside the combustion kiln. Since the secondary aluminum ash contains aluminum nitride, the oxidation reaction of aluminum nitride occurs at a temperature of 1050℃~1150℃. However, when the temperature exceeds 1400℃, the oxidation reaction of aluminum nitride will be inhibited, which will reduce the denitrification effect. Since the secondary combustion kiln and the main combustion kiln rotate in opposite directions, by increasing the difference in their rotation speeds, the agglomerated secondary aluminum ash can be tumbled and stirred at the junction of the two, which plays a role in thorough grinding. This allows the secondary aluminum ash to fully contact the additives and air inside the combustion kiln, improving the efficiency of the oxidation reaction.

[0061] Example 2

[0062] In this embodiment, to further describe how to solve the problem of the first rotating mechanism controlling the rotation of the combustion kiln body, specifically, by setting a main kiln body and a main rotating gear on the combustion kiln body, fixing the main kiln body on the base circle of the main rotating gear, and then by meshing the main rotating gear with the drive gear of the first rotating mechanism, the drive wheel of the first rotating mechanism drives the main rotating gear to rotate, thereby rotating the main kiln body fixed on the main rotating gear. This realizes the first rotating mechanism controlling the rotation of the combustion kiln body, and at the same time, by placing the main rotating gear at the center of the main kiln body, the load on the rotating motor of the first rotating mechanism can be reduced.

[0063] It should be noted that, to further describe how to solve the problem of controlling the rotation of the secondary combustion kiln body by the second rotating mechanism, specifically, a secondary kiln body, a secondary rotating gear, and a support wheel are set on the secondary combustion kiln body. The secondary kiln body is fixed at the base circle of the secondary rotating gear, and the secondary rotating gear is located at the center of the kiln body. The support wheel is set on both sides of the secondary rotating gear, and the central axis of the support wheel coincides with the central axis of the kiln body rotating gear. The second rotating mechanism is equipped with a power gear and a balance pulley. The power gear is meshed with the kiln body rotating gear, and the balance pulley is tangent to the support wheel. The power gear of the second rotating mechanism drives the secondary rotating gear to rotate, which in turn rotates the secondary kiln body fixed on the secondary rotating gear. This realizes the control of the rotation of the secondary combustion kiln body by the second rotating mechanism. At the same time, the balance pulley and the support wheel are in contact and can slide against each other, so that the long secondary combustion kiln body can maintain balance during rotation.

[0064] It is worth noting that, in order to further describe how to solve the problem of sliding connection between the main body of the combustion kiln and the secondary body of the combustion kiln and the aluminum ash discharge bucket, specifically, by setting rotating bearings on the main body of the combustion kiln, the rotating bearings are set on both sides of the rotating gear of the main body, with one rotating bearing located between the outer wall of the main body of the combustion kiln and the inner wall of the aluminum ash discharge bucket, and the other rotating bearing located between the outer wall of the main body of the combustion kiln and the outer wall of the secondary body of the combustion kiln. This allows the main body of the combustion kiln and the secondary body of the combustion kiln to rotate independently in opposite directions, so that when the secondary aluminum ash is transported from the secondary body of the combustion kiln to the main body of the combustion kiln, it can be tumbled and stirred. At the same time, the rotation of the main body of the combustion kiln will not affect the aluminum ash discharge bucket and will not hinder the discharge of secondary aluminum ash from the aluminum ash discharge bucket.

[0065] Example 3

[0066] In this embodiment, to further describe how to solve the problem of cooling the regenerated secondary aluminum ash in the aluminum ash cooling device, specifically, the aluminum ash cooling device is also equipped with a tank rotation gear. The cooling tank is fixed on the base circle of the tank rotation gear, and the tank rotation gear is located at the center of the cooling tank. By meshing the tank rotation gear with the drive gear of the third rotation mechanism, the third rotation mechanism can drive the cooling tank to rotate by driving the tank rotation gear, thereby driving the cooling tank to rotate. This allows the regenerated secondary aluminum ash to tumble and stir in the cooling tank, fully contacting the air and accelerating cooling. At the same time, the cooling tank is also equipped with a cooling water channel, which is located between the inner and outer walls of the cooling tank. The cooling water flowing in the cooling water channel can... The process quickly removes heat from the cooling tank, lowering its internal temperature and allowing for better cooling of the recycled secondary aluminum ash. Finally, a first waste gas treatment device, consisting of a first bag filter and a first fan, is installed on the recycling production line. The output of the cooling tank is connected to the input of the first bag filter, while the output of the first bag filter is connected to the first fan via a duct. When the first fan operates, it draws air from the cooling tank, accelerating airflow and further cooling the recycled secondary aluminum ash. The air passing through the first bag filter before reaching the first fan is then discharged into the atmosphere to remove dust, preventing environmental pollution.

[0067] Example 4

[0068] In this embodiment, to further describe how to solve the problem of dust escaping when secondary aluminum ash is fed into the secondary combustion kiln before purification and regeneration, specifically, a second waste gas treatment device is installed on the regeneration production line. This second waste gas treatment device consists of a second bag filter, a gravity dust collector, a cyclone dust collector, a denitrification tower, and a second fan. The output end of the gravity dust collector is connected to the input end of the secondary combustion kiln, and the exhaust end of the gravity dust collector is connected to the input end of the cyclone dust collector. Then, the output end of the cyclone dust collector is connected to the input end of the second bag filter, and the output end of the second bag filter is connected to the input end of the denitrification tower. Finally, the output end of the denitrification tower... It is connected to the second fan; when the second fan draws air, the dust-laden airflow first passes through the gravity dust removal mechanism, which separates and settles the larger solid particles in the gas. Then, the dust-laden airflow enters the cyclone dust removal mechanism, which makes the dust-laden airflow rotate. With the help of centrifugal force, the dust particles are separated from the airflow and captured on the wall of the device. Then, with the help of gravity, the dust particles fall into the ash hopper. After that, the dust-laden airflow enters the second bag dust removal mechanism, which uses the filtration effect of the fiber fabric to filter the dust-laden gas. Then, it enters the denitrification tower to remove nitrogen oxides from the gas. Finally, it purifies the dust that escapes when the secondary aluminum ash before regeneration is fed into the combustion kiln, and avoids it being directly discharged into the atmosphere and causing environmental pollution.

[0069] In this example, the gravity dust removal mechanism is a gravity dust collector, which is a device that separates dust from gas by relying on the gravity settling of dust particles. The process of dust settling by gravity involves the flue gas entering the gravity settling device horizontally. Under the action of gravity, the dust particles gradually settle down, while the gas continues to move horizontally, thereby achieving the purpose of dust removal.

[0070] The first and second bag filter dust collection mechanisms mentioned above are both baghouse dust collectors, which are dry dust filtration devices. They are suitable for collecting fine, dry, non-fibrous dust. The filter bags are made of woven filter cloth or non-woven felt, utilizing the filtration effect of the fibrous fabric to filter dust-laden gas. When the dust-laden gas enters the baghouse dust collector, larger, heavier dust particles settle down due to gravity and fall into the ash hopper. The gas containing finer dust particles is purified as it passes through the filter media, as the dust is trapped.

[0071] The cyclone dust collector in this example is a cyclone dust collector, a type of dust removal device. A cyclone dust collector utilizes the centrifugal force generated by a rotating dust-laden airflow to separate particulate pollutants from the gas. When the dust-laden airflow enters the cyclone dust collector through the inlet pipe, the airflow changes from linear motion to circular motion. Most of the rotating airflow spirals downwards along the wall and cylindrical body, flowing towards the cone. During this rotation, the dust-laden gas generates centrifugal force, throwing particles denser than the gas towards the wall. Once the particles contact the wall, they lose inertia and fall along the wall due to the momentum of their inlet velocity and downward gravity, entering the ash discharge pipe. The descending cyclone airflow, upon reaching the cone, converges towards the center of the dust collector due to the conical contraction, and its tangential velocity continuously increases. When the airflow reaches a certain position at the lower end of the cone, it continues its spiral motion from bottom to top within the cyclone dust collector in the same direction of rotation. Finally, the purified gas is discharged from the collector through the exhaust pipe, completing the dust removal process.

[0072] The denitrification tower in this example consists of a tower body, a gas distributor, a liquid distributor, a liquid redistribution ring, a spray device, and a demister. It adopts a wet denitrification process. The denitrification tower uses nozzle-type empty tower spraying. Due to the atomization effect of the nozzle, the denitrifying agent is split into countless small-diameter droplets, and its total surface area is increased thousands of times, allowing the gas and liquid to come into full contact. This allows the dust-laden gas to fully react with the denitrifying agent. A demister is installed at the top of the denitrification tower. Through the collision action of the demister baffle plate, the dust and other water droplets and solid particles carried by the flue gas are captured and separated by the demister, completing the dust removal and denitrification of the dust-laden gas.

[0073] It should be noted that, in order to store the secondary aluminum ash before and after recycling, specifically, a clinker silo and a raw material silo are set up on the recycling production line. The raw material silo is used to store the secondary aluminum ash before recycling, and the output end of the raw material silo is connected to the input end of the gravity dust removal mechanism, so that the secondary aluminum ash in the raw material silo can be prevented from being directly emitted into the atmosphere during the process of feeding into the combustion kiln. The clinker silo is used to store the secondary aluminum ash after recycling, and the input end of the clinker silo is connected to the output end of the cooling tank, so that the secondary aluminum ash after recycling can be directly transported into the clinker silo after cooling.

[0074] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different emphases; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the structure in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0075] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A secondary aluminum ash recycling and calcination production line, characterized in that, include: Aluminum ash calcination device, aluminum ash discharge hopper, aluminum ash cooling device and aluminum ash combustion device; The aluminum ash calcination device includes a combustion kiln body, a combustion kiln sub-body, a first rotating mechanism, and a second rotating mechanism. The aluminum ash cooling device includes a cooling tank and a third rotating mechanism. One end of the main body of the combustion kiln is connected to the secondary body of the combustion kiln. The opening of the aluminum ash discharge barrel is connected to the other end of the main body of the combustion kiln. The inner wall of the aluminum ash discharge barrel is slidably connected to the outer wall of the main body of the combustion kiln. The bottom of the aluminum ash discharge barrel is provided with an aluminum ash outlet, which is connected to the inlet end of the cooling tank. The first rotating mechanism controls the rotation of the main body of the combustion kiln, the second rotating mechanism controls the rotation of the secondary body of the combustion kiln, and the rotation direction of the main body of the combustion kiln is opposite to the rotation direction of the secondary body of the combustion kiln; the third rotating mechanism controls the rotation of the cooling tank. The aluminum ash combustion device includes a flame gun and a gas supply pipe. The flame gun is connected to the gas supply pipe, and the nozzle of the flame gun passes through the aluminum ash discharge bucket and is located inside the main body of the combustion kiln. The spray direction of the flame gun faces the end of the secondary body of the combustion kiln. The end of the secondary combustion kiln body is used to input secondary aluminum ash to be processed; the gas supply pipe is used to input combustible mixed gas; the slope of the main combustion kiln body is less than or equal to 10%, and the slope of the main combustion kiln body and the secondary combustion kiln body are equal; The rotation direction of the main body of the combustion kiln is opposite to that of the secondary body of the combustion kiln, so that the secondary aluminum ash is uniformly stirred, turned over and spread evenly at the connection point between the two. The location of the connection point is close to the flame gun, so as to efficiently calcine the uniformly spread secondary aluminum ash. The secondary combustion kiln includes a secondary kiln body, a secondary rotating gear, and a support wheel. The secondary kiln body is fixed at the base circle of the secondary rotating gear, and the secondary rotating gear is located at the center of the kiln body. The support wheel is arranged on both sides of the secondary rotating gear, and the central axis of the support wheel coincides with the central axis of the kiln body rotating gear. The second rotating mechanism includes a power gear and a balance pulley. The power gear is meshed with the kiln body rotating gear, and the balance pulley is tangent to the support wheel. The aluminum ash cooling device also includes a tank rotating gear. The cooling tank is fixed on the base circle of the tank rotating gear, and the tank rotating gear is located at the center of the cooling tank. The tank rotating gear is meshed with the drive gear of the third rotating mechanism.

2. The secondary aluminum ash recycling and calcination production line according to claim 1, characterized in that, The combustion kiln body includes a main kiln body and a main rotating gear. The main kiln body is fixed on the base circle of the main rotating gear, and the main rotating gear is located at the center of the main kiln body. The main rotating gear is meshed with the drive gear of the first rotating mechanism.

3. The secondary aluminum ash recycling and calcination production line according to claim 1, characterized in that, The main body of the combustion kiln also includes a rotating bearing, which is arranged on both sides of the rotating gear of the main body. One side of the rotating bearing is located between the outer wall of the main body of the combustion kiln and the inner wall of the aluminum ash discharge bucket, and the other side of the rotating bearing is located between the outer wall of the main body of the combustion kiln and the outer wall of the secondary body of the combustion kiln.

4. The secondary aluminum ash recycling and calcination production line according to claim 1, characterized in that, It also includes a first exhaust gas treatment device, which includes a first bag filter mechanism and a first fan. The output end of the cooling tank is connected to the input end of the first bag filter mechanism, and the first fan is connected to the output end of the first bag filter mechanism through a conduit.

5. The secondary aluminum ash recycling and calcination production line according to claim 1, characterized in that, It also includes a second waste gas treatment device, which includes a second bag filter, a gravity filter, a cyclone filter, a denitrification tower, and a second fan. The output end of the gravity filter is connected to the input end of the combustion kiln body, the exhaust end of the gravity filter is connected to the input end of the cyclone filter, the output end of the cyclone filter is connected to the input end of the second bag filter, the output end of the second bag filter is connected to the input end of the denitrification tower, and the output end of the denitrification tower is connected to the second fan.

6. The secondary aluminum ash recycling and calcination production line according to claim 1, characterized in that, It also includes a clinker silo, the input end of which is connected to the output end of the cooling tank, and the clinker silo is used to store secondary aluminum ash after recycling.

7. The secondary aluminum ash recycling and calcination production line according to claim 5, characterized in that, It also includes a raw material silo, the output end of which is connected to the input end of the gravity dust removal mechanism, and the raw material silo is used to store secondary aluminum ash before regeneration.

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