Recycling aluminum recovery method and system

Abstract

This application discloses a method and system for recycling recycled aluminum. The method includes: placing recycled aluminum raw materials in a modified smelting furnace and heating them to a preset temperature range to melt the recycled aluminum raw materials into molten recycled aluminum; simultaneously controlling the rotation speed of the modified smelting furnace body to cause the molten recycled aluminum to tumble under centrifugal force within the furnace body to obtain refined aluminum liquid; cooling the refined aluminum liquid into recycled aluminum ingots; using the excitation force of a high-frequency vibrating screen to separate the recycled aluminum ingots by particle size; simultaneously using an airflow screen to perform density separation on the recycled aluminum ingots until the recycled aluminum particles and impurities in the recycled aluminum ingots are separated; heating the separated recycled aluminum particles to a preset temperature range to obtain molten aluminum; dissolving the metal compounds to be dissolved in the molten aluminum using a novel composite solvent to obtain purified molten aluminum; and cooling and casting the purified molten aluminum into ingots to obtain recycled aluminum ingots. This method can efficiently separate impurities, accurately purify aluminum particles, and improve the recycling quality.

Description

Technical Field

[0001] This application relates to the field of recycled aluminum technology, and in particular to a method and system for recycled aluminum. Background Technology

[0002] Global aluminum consumption continues to grow, while the energy consumption of primary aluminum production is more than 10 times that of recycled aluminum.

[0003] Against the backdrop of continuously increasing global aluminum consumption, recycled aluminum has become a key pathway to alleviate the resource crisis and reduce carbon emissions. Primary aluminum production is not only energy-intensive, but also emits more than 10 times the carbon dioxide per ton of primary aluminum compared to recycled aluminum. Summary of the Invention

[0004] In view of this, this application provides a method and system for recycling aluminum, which can solve the problems of high energy consumption, low recycling efficiency and incomplete impurity separation in current aluminum recycling technologies. By optimizing the process flow and improving thermal efficiency, the goal of low-energy consumption and high-efficiency recycling of aluminum can be achieved.

[0005] According to one aspect of this application, a method for recycling aluminum is provided, the method comprising: Obtain recycled aluminum raw materials; The recycled aluminum raw material is placed in the modified smelting furnace and the modified smelting furnace is heated to a preset temperature range so that the recycled aluminum raw material is melted into molten recycled aluminum. The rotation speed of the furnace body is controlled simultaneously so that the molten recycled aluminum tumbles under the action of centrifugal force in the furnace body to obtain refined aluminum liquid. The refined aluminum liquid is cooled into recycled aluminum ingots. The recycled aluminum ingots are then separated by particle size using the excitation force of a high-frequency vibrating screen. Simultaneously, an air classifier is used to sort the recycled aluminum ingots by density until the recycled aluminum particles and impurities in the recycled aluminum ingots are separated. The separated recycled aluminum particles are heated again to a preset temperature range to obtain molten aluminum. A novel composite solvent is added to the molten aluminum to dissolve the metal compounds that need to be dissolved in the molten aluminum, thereby obtaining purified molten aluminum. The metal compounds include aluminum oxide. The purified molten aluminum is cooled and cast into ingots to obtain recycled aluminum ingots.

[0006] Optionally, the step of heating the separated recycled aluminum particles again to a preset temperature range includes: Collect hot ash of the same mass grade as recycled aluminum particles; The heat from the hot ash is used to heat the separated recycled aluminum particles to a preset temperature range.

[0007] Optionally, the collection of hot ash of the same mass grade as the recycled aluminum particles includes: After the modification, a multi-stage heat exchanger is integrated at the outlet end of the smelting furnace so that each stage of the heat exchanger can recover at least one of the high-temperature flue gas, hot ash and furnace wall radiant heat generated by the smelting furnace. The hot ash recovered through a multi-stage heat exchanger is collected in the same mass level as the recycled aluminum particles.

[0008] Optionally, obtaining recycled aluminum raw materials includes: Obtain aluminum scrap; The aluminum waste is crushed to a preset particle size range to obtain recycled aluminum raw materials.

[0009] Optionally, the outlet end of the modified smelting furnace is also integrated with an infrared thermal imager and a LIBS laser-induced breakdown spectrometer. After placing the recycled aluminum raw material into the modified smelting furnace, the method further includes: The temperature of molten recycled aluminum in the modified smelting furnace is monitored in real time by infrared thermal imager, and the content of various elements in molten recycled aluminum in the modified smelting furnace is detected in real time by LIBS laser-induced breakdown spectrometer. Among them, LIBS laser-induced breakdown spectrometer identifies the content of various elements in molten recycled aluminum online through multispectral fusion algorithm. When the LIBS laser-induced breakdown spectrometer detects that the purity of the molten recycled aluminum is lower than the preset standard purity, a new type of composite solvent is automatically injected into the modified smelting furnace. The amount of the new composite solvent added is dynamically adjusted according to the detected impurity concentration.

[0010] Optionally, the method further includes: A smelting process prediction model is constructed based on an LSTM neural network. The input variables of the smelting process prediction model include the temperature of the refined aluminum liquid, the rotation speed of the furnace body, and the heat wave of the hot ash. The smelting process prediction model outputs the burner air-fuel ratio, charging timing, and stirring frequency based on input variables, so that the smelting furnace can adjust the gas flow rate in real time according to the burner air-fuel ratio.

[0011] Optionally, the modified smelting furnace is obtained by improving the traditional fixed smelting furnace into a horizontal rotary furnace body, and adding an embedded heat pipe array to the inner wall of the horizontal rotary furnace body. The heat pipes are used to connect with an external multi-stage heat exchanger to form a continuous heat conduction path.

[0012] Optionally, the components of the novel composite solvent include a fluoride-chloride eutectic system.

[0013] Optionally, the preset temperature range includes 720°C to 750°C.

[0014] According to another aspect of this application, a recycled aluminum recovery system is provided, the system comprising: The recycled aluminum raw material acquisition module is used to acquire recycled aluminum raw materials; The recycled aluminum raw material refining module is used to place the recycled aluminum raw material in the modified smelting furnace and heat the modified smelting furnace to a preset temperature range so that the recycled aluminum raw material is melted into molten recycled aluminum. Simultaneously, the rotation speed of the furnace body of the modified smelting furnace is controlled so that the molten recycled aluminum is tumbled under the action of centrifugal force in the furnace body to obtain refined aluminum liquid. The physical purification module for recycled aluminum is used to cool the refined aluminum liquid into recycled aluminum ingots. The recycled aluminum ingots are separated by particle size through the excitation force of the high-frequency vibrating screen, and the recycled aluminum ingots are simultaneously sorted by density using an air classifier until the recycled aluminum particles and impurities in the recycled aluminum ingots are separated. The recycled aluminum chemical purification module is used to heat the separated recycled aluminum particles to a preset temperature range to obtain molten aluminum. A novel composite solvent is added to the molten aluminum to dissolve the metal compounds that need to be dissolved in the molten aluminum, thereby obtaining purified molten aluminum. The metal compounds include aluminum oxide. The recycled aluminum module is used to cool and cast purified molten aluminum into ingots to obtain recycled aluminum ingots.

[0015] According to another aspect of this application, a storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the above-described method for recycling recycled aluminum.

[0016] According to another aspect of this application, a computer device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor executes the program to implement the above-described recycled aluminum recovery method.

[0017] Using the above technical solution, this application provides a method and system for recycling recycled aluminum. The recycled aluminum raw material is placed in a modified smelting furnace and heated to a preset temperature range to melt it into molten recycled aluminum. Simultaneously, the rotation speed of the modified smelting furnace is controlled, causing the molten recycled aluminum to tumble under centrifugal force within the furnace, resulting in refined aluminum liquid. The refined aluminum liquid is cooled into recycled aluminum ingots. The ingots are then separated by particle size using a high-frequency vibrating screen, and simultaneously, a gas flow screen is used for density separation until the recycled aluminum particles are separated from impurities. The separated recycled aluminum particles are heated to a preset temperature range to obtain molten aluminum. The metal compounds to be dissolved in the molten aluminum are dissolved using a novel composite solvent to obtain purified molten aluminum. The purified molten aluminum is then cooled and cast into ingots to obtain recycled aluminum ingots. This method efficiently separates impurities, precisely purifies aluminum particles, and improves recycling quality.

[0018] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A schematic flowchart of a method for recycling aluminum according to an embodiment of this application is shown; Figure 2 A schematic flowchart of the method for reducing energy consumption by utilizing hot ash in the recycling of recycled aluminum, provided in an embodiment of this application, is shown. Figure 3 A schematic diagram of a recycled aluminum recovery system provided in an embodiment of this application is shown. Detailed Implementation

[0020] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0021] This embodiment provides a method for recycling aluminum, such as... Figure 1 As shown, the method includes: Step 101: Obtain recycled aluminum raw materials.

[0022] Step 102: Place the recycled aluminum raw material into the modified smelting furnace and heat the modified smelting furnace to a preset temperature range so that the recycled aluminum raw material melts into molten recycled aluminum. Simultaneously control the rotation speed of the modified smelting furnace so that the molten recycled aluminum tumbles under the action of centrifugal force in the furnace body to obtain refined aluminum.

[0023] In the above embodiments of this application, it can be applied to the following application scenarios: recycling of waste automotive parts (such as engine housings and wheel hubs), dismantling of aluminum alloy doors and windows for buildings, extraction of aluminum from electronic and electrical waste, and regeneration of high-end alloy rework materials for aerospace.

[0024] Specifically, recycled aluminum raw materials are first obtained, with a preset temperature range, such as 720°C to 750°C. The recycled aluminum raw materials are then put into a modified rotary melting furnace and heated to the preset temperature to melt it. By precisely controlling the furnace rotation speed (e.g., 0.5–3 rpm), centrifugal force is used to make the molten aluminum liquid dynamically tumble, promoting the floating of inclusions and the escape of gases. This can improve the purity of the aluminum liquid and further shorten the refining time2, while reducing energy consumption and achieving a highly efficient and energy-saving refining effect.

[0025] Optionally, step 101 involves obtaining recycled aluminum raw materials, including: Step 1011: Obtain aluminum scrap.

[0026] Step 1012: The aluminum waste is crushed to a preset particle size range to obtain recycled aluminum raw material.

[0027] In the above embodiments of this application, aluminum scrap is obtained and crushed to a preset particle size range, for example, crushed to a particle size of less than 5 mm, to increase the surface area for subsequent processing until recycled aluminum raw materials are obtained. Specifically, large pieces of scrap aluminum (such as automobile wheel hubs and door and window frames) can be collected, and then coarsely crushed using a dual-shaft shear crusher, while simultaneously removing ferrous metals using an ultra-high-intensity magnetic separator. The coarsely crushed aluminum scrap is then separated from non-metallic impurities (such as plastics and rubber) using an eddy current separator, utilizing an alternating magnetic field to obtain recycled aluminum raw materials. This allows for subsequent low-temperature chemical treatment (using environmentally friendly solvents) to further remove fine impurities and avoid secondary pollution.

[0028] Step 103: Cool the refined aluminum liquid into recycled aluminum ingots. Use the excitation force of a high-frequency vibrating screen to separate the recycled aluminum ingots by particle size. Simultaneously use an air classifier to sort the recycled aluminum ingots by density until the recycled aluminum particles and impurities in the recycled aluminum ingots are separated.

[0029] Then, large particles (e.g., particles >1mm) are removed from the recycled aluminum ingots through physical screening and airflow separation. Specifically, a high-frequency vibrating screen can be used to stratify the particles by size, and the excitation force of the vibrating screen can be adjusted to ensure uniform distribution of aluminum particles. An airflow separator separates lightweight impurities (such as wood chips and plastics) by controlling the airflow speed. Therefore, by combining mechanical crushing and physical separation, efficient and grade-protected recycling of aluminum resources can be achieved.

[0030] Step 104: The separated recycled aluminum particles are heated again to a preset temperature range to obtain molten aluminum. A novel composite solvent is added to the molten aluminum to dissolve the metal compounds that need to be dissolved in the molten aluminum, thereby obtaining purified molten aluminum. The metal compounds include aluminum oxide, and the novel composite solvent consists of a fluoride-chloride eutectic system.

[0031] Step 105: Cool the purified molten aluminum and cast it into ingots to obtain recycled aluminum ingots.

[0032] Next, the preset temperature range is 720-750°C, that is, the solvent is added and treated for 30 minutes at 720-750°C to dissolve the residual oxides. Then, the post-processing stage is carried out, that is, the aluminum liquid is cooled and cast into ingots to ensure that the metal purity reaches 99.7%.

[0033] Optionally, such as Figure 2 As shown, in step 104, the separated recycled aluminum particles are heated again to a preset temperature range, including: Step 1041: Collect hot ash of the same mass grade as the recycled aluminum particles.

[0034] Step 1042: The separated recycled aluminum particles are heated to a preset temperature range using the heat from the hot ash.

[0035] Currently, the heating of recycled aluminum granules results in significant heat loss leading to excessive energy consumption, and incomplete impurity separation affects recycling efficiency. These problems stem from insufficient thermal efficiency of the smelting furnace (typically below 70%) and complex impurity treatment processes. A key challenge in addressing these issues is how to improve impurity removal rates while reducing energy consumption, avoiding increased equipment costs or the introduction of secondary pollution.

[0036] In the above embodiments of this application, a heat exchange device can be integrated into the smelting stage to recover waste heat from hot ash, improve thermal efficiency, and thus reduce energy consumption. Specifically, a waste heat recovery route can be used to heat recycled aluminum particles to 750°C for 2.5 hours, which reduces energy consumption compared to electrolytic aluminum. Through the heat recovery system, energy consumption per ton of aluminum can be reduced, saving energy. Simultaneously, impurities are thoroughly separated, recovery efficiency is improved, and yield and quality are increased. Cost and environmental optimization are achieved, reducing raw material waste and process complexity, simplifying processing operations; there is no secondary pollution, meeting environmental protection requirements.

[0037] Optionally, the modified smelting furnace is obtained by modifying a traditional fixed smelting furnace into a horizontal rotary furnace body, and adding an embedded heat pipe array to the inner wall of the horizontal rotary furnace body. The heat pipes are used to connect with an external multi-stage heat exchanger to form a continuous heat conduction path. Step 1041 involves collecting hot ash of the same mass level as the recycled aluminum particles, including: Step 10411: Integrate a multi-stage heat exchanger at the outlet end of the modified smelting furnace so that each stage of the heat exchanger can recover at least one of the high-temperature flue gas, hot ash and furnace wall radiant heat generated by the modified smelting furnace.

[0038] Step 10412: Collect hot ash of the same mass level as the recycled aluminum particles from the hot ash recovered through the multi-stage heat exchanger.

[0039] In the embodiments described above, the melting process can be carried out in a modified furnace, with the temperature continuously controlled at 720-750°C, and the thermal efficiency maintained by utilizing the recovered waste heat. Alternatively, a rotary melting method can be used, with a processing time of approximately 2 hours. Therefore, by collecting "ready-made" hot ash to provide heat, energy consumption can be reduced.

[0040] Specifically, a "cascaded heat recovery closed-loop system" can be introduced. This system integrates multi-stage heat exchangers at the outlet of the modified smelting furnace to recover high-temperature flue gas, hot ash, and radiant heat from the furnace wall, and uses these resources in stages for preheating raw materials, maintaining furnace insulation, and driving auxiliary equipment. Furthermore, the traditional stationary smelting furnace can be structurally modified by adopting a horizontal rotating furnace design with an embedded heat pipe array on the inner wall. The rotation speed is controllable (0.5–3 rpm), promoting uniform heating of materials and shortening reaction time; the heat pipes are connected to the external multi-stage heat exchangers, forming a continuous heat conduction path and preventing localized overheating that could lead to metal burn-out.

[0041] Optionally, the outlet end of the modified smelting furnace is also integrated with an infrared thermal imager and a LIBS laser-induced breakdown spectrometer. In step 102, after placing the recycled aluminum raw material into the modified smelting furnace, the method further includes: Step 106: The temperature of molten recycled aluminum in the modified smelting furnace is monitored in real time using an infrared thermal imager, and the content of various elements in the molten recycled aluminum in the modified smelting furnace is detected in real time using a LIBS laser-induced breakdown spectrometer. The LIBS laser-induced breakdown spectrometer uses a multispectral fusion algorithm to identify the content of various elements in the molten recycled aluminum online.

[0042] Step 107: When the LIBS laser-induced breakdown spectrometer detects that the purity of the molten recycled aluminum is lower than the preset standard purity, a new type of composite solvent is automatically injected into the modified smelting furnace. The amount of the new composite solvent added is dynamically adjusted according to the detected impurity concentration.

[0043] In the above embodiments of this application, an infrared temperature measurement and online spectral monitoring module can be provided to provide real-time feedback on the purity of the molten aluminum; the preset standard purity of the molten aluminum is, for example, 99.5%. In particular, a complete data interface and control logic architecture can be reserved to support the integration of AI algorithms to achieve dynamic optimization of the smelting process.

[0044] Specifically, in the smelting process of recycled aluminum raw materials, integrating an infrared thermal imager and a LIBS laser-induced breakdown spectrometer enables real-time monitoring and precise control of temperature and composition. The infrared thermal imager monitors the temperature distribution of the molten aluminum (molten recycled aluminum) in the smelting furnace in real time through a non-contact method, capturing abnormal temperature zones. It possesses all-weather, multi-angle temperature measurement capabilities, providing timely warnings when abnormal temperatures occur in the molten aluminum, assisting in optimizing energy input and preventing equipment failure. The LIBS laser-induced breakdown spectrometer uses a multispectral fusion algorithm to identify the content of various elements in the molten aluminum online, achieving purity assessment. When the purity of the molten aluminum is detected to be lower than a preset standard (e.g., 99.5%), a new type of composite solvent is automatically injected into the modified smelting furnace, and the amount added is dynamically adjusted according to the real-time detected impurity concentration. This technology, combined with reserved data interfaces and control logic architecture, provides a foundation for subsequent integration of AI algorithms to achieve dynamic optimization of the smelting process.

[0045] Optionally, the method further includes: Step 108: Construct a smelting process prediction model based on an LSTM neural network, wherein the input variables of the smelting process prediction model include the temperature of the refined aluminum liquid, the furnace rotation speed, and the heat wave of the hot ash.

[0046] Step 109: The smelting process prediction model outputs the burner air-fuel ratio, feeding timing, and stirring frequency based on the input variables, so that the smelting furnace can adjust the gas flow rate in real time according to the burner air-fuel ratio.

[0047] In the above embodiments of this application, the optimal charging timing and optimal stirring frequency can be predicted based on a machine learning model, automatically adjusting combustion parameters. Specifically, the prediction model uses real-time sensor data such as aluminum molten (refined aluminum molten) temperature, furnace rotation speed, and hot ash heat wave as input sequences. LSTM captures the long-term dependencies between these parameters through its unique gating mechanism (forget gate, input gate, output gate), ultimately outputting key control parameters such as charging timing, stirring frequency, and burner air-fuel ratio. Furthermore, the core prediction mechanism of LSTM is: 1. Temporal Feature Learning: LSTM transmits historical information through the state of memory cells. For example, the forget gate determines how much past aluminum melt temperature influence is retained, and the input gate controls the degree to which the current hot ash heat wave data updates the state. This structure enables it to effectively understand complex temporal patterns such as "whether it is necessary to add material in advance after continuous high temperature".

[0048] 2. Control Parameter Prediction: After the model learns the complex nonlinear mapping between the input sequence and the output control target (such as air-fuel ratio), it can make predictions. During training, techniques such as exponential moving averages are often used to denoise the input data to improve prediction stability.

[0049] The burner air-fuel ratio predicted by the model is directly sent to the furnace control system. The system then adjusts the gas flow rate in real time to ensure the combustion process remains highly efficient. This forms a closed-loop optimization process of "data acquisition—LSTM prediction—parameter adjustment—effect feedback".

[0050] Therefore, by upgrading the control strategy from experience-driven and fixed-rule-based to data-driven dynamic optimization, it can adapt to various dynamic changes in the smelting process, thereby achieving more precise and efficient automated production.

[0051] By applying the technical solution of this embodiment, the original separation process adopts a chemical separation method. This application uses a two-stage separation process, resulting in higher purity. Specifically, the first stage uses a high-frequency vibrating screen + air separation combined device to accurately remove non-metallic inclusions (such as plastics, sand, etc.) larger than 1mm. The second stage introduces a self-developed environmentally friendly composite solvent (composed of a fluoride-chloride eutectic system, free of highly toxic cyanide) to selectively dissolve Al2O3 (alumina) and other intermetallic compounds at 720–750°C, with a reaction time of only 30 minutes. This improves the overall impurity removal rate, allows for solvent recycling, and the addition of hot ash to provide heat reduces energy consumption.

[0052] Furthermore, as Figure 1 To specifically implement the method, this application provides a recycled aluminum system, such as... Figure 3 As shown, the system includes: The recycled aluminum raw material acquisition module 201 is used to acquire recycled aluminum raw materials; The recycled aluminum raw material refining module 202 is used to place the recycled aluminum raw material in the modified smelting furnace and heat the modified smelting furnace to a preset temperature range so that the recycled aluminum raw material is melted into molten recycled aluminum. The furnace body rotation speed is controlled simultaneously so that the molten recycled aluminum is tumbled under the action of centrifugal force in the furnace body to obtain refined aluminum liquid. The physical purification module 203 for recycled aluminum is used to cool the refined aluminum liquid into recycled aluminum ingots. The recycled aluminum ingots are separated by particle size through the excitation force of the high-frequency vibrating screen, and the recycled aluminum ingots are simultaneously sorted by density using an air classifier until the recycled aluminum particles and impurities in the recycled aluminum ingots are separated. The recycled aluminum chemical purification module 204 is used to heat the separated recycled aluminum particles to a preset temperature range again to obtain molten aluminum. A novel composite solvent is added to the molten aluminum to dissolve the metal compounds that need to be dissolved in the molten aluminum, thereby obtaining purified molten aluminum. The metal compounds include aluminum oxide. The recycled aluminum recycling module 205 is used to cool and cast purified molten aluminum into ingots to obtain recycled aluminum ingots.

[0053] It should be noted that other corresponding descriptions of the functional units involved in the recycled aluminum recycling system provided in this application embodiment can be found in the following references. Figures 1 to 2 The corresponding descriptions in the method will not be repeated here.

[0054] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application. Those skilled in the art will understand that the modules in the apparatus of the embodiment can be distributed within the apparatus of the embodiment as described, or can be modified to be located in one or more apparatuses different from this embodiment. The modules of the above-described embodiment can be combined into one module, or further divided into multiple sub-modules.

[0055] The serial numbers in this application are for descriptive purposes only and do not represent the superiority or inferiority of any particular implementation scenario. The above disclosures are merely a few specific implementation scenarios of this application; however, this application is not limited thereto, and any modifications that can be made by those skilled in the art should fall within the protection scope of this application.

Claims

1. A method for recycling aluminum, characterized by, The method includes: Obtain recycled aluminum raw materials; The recycled aluminum raw material is placed in the modified smelting furnace and the modified smelting furnace is heated to a preset temperature range so that the recycled aluminum raw material is melted into molten recycled aluminum. The rotation speed of the furnace body is controlled simultaneously so that the molten recycled aluminum tumbles under the action of centrifugal force in the furnace body to obtain refined aluminum liquid. The refined aluminum liquid is cooled into recycled aluminum ingots. The recycled aluminum ingots are then separated by particle size using the excitation force of a high-frequency vibrating screen. Simultaneously, an air classifier is used to sort the recycled aluminum ingots by density until the recycled aluminum particles and impurities in the recycled aluminum ingots are separated. The separated recycled aluminum particles are heated again to a preset temperature range to obtain molten aluminum. A novel composite solvent is added to the molten aluminum to dissolve the metal compounds that need to be dissolved in the molten aluminum, thereby obtaining purified molten aluminum. The metal compounds include aluminum oxide. The purified molten aluminum is cooled and cast into ingots to obtain recycled aluminum ingots.

2. The method of claim 1, wherein, The step of reheating the separated recycled aluminum particles to a preset temperature range includes: Collect hot ash of the same mass grade as recycled aluminum particles; The heat from the hot ash is used to heat the separated recycled aluminum particles to a preset temperature range.

3. The method of claim 2, wherein, The collection of hot ash of the same mass grade as recycled aluminum particles includes: After the modification, a multi-stage heat exchanger is integrated at the outlet end of the smelting furnace so that each stage of the heat exchanger can recover at least one of the high-temperature flue gas, hot ash and furnace wall radiant heat generated by the smelting furnace. The hot ash recovered through a multi-stage heat exchanger is collected in the same mass level as the recycled aluminum particles.

4. The method of claim 1, wherein, The process of obtaining recycled aluminum raw materials includes: Obtain aluminum scrap; The aluminum waste is crushed to a preset particle size range to obtain recycled aluminum raw materials.

5. The method according to claim 1, characterized in that, The modified smelting furnace outlet is also equipped with an infrared thermal imager and a LIBS laser-induced breakdown spectrometer. After placing the recycled aluminum raw material into the modified smelting furnace, the method further includes: The temperature of molten recycled aluminum in the modified smelting furnace is monitored in real time by infrared thermal imager, and the content of various elements in molten recycled aluminum in the modified smelting furnace is detected in real time by LIBS laser-induced breakdown spectrometer. Among them, LIBS laser-induced breakdown spectrometer identifies the content of various elements in molten recycled aluminum online through multispectral fusion algorithm. When the LIBS laser-induced breakdown spectrometer detects that the purity of the molten recycled aluminum is lower than the preset standard purity, a new type of composite solvent is automatically injected into the modified smelting furnace. The amount of the new composite solvent added is dynamically adjusted according to the detected impurity concentration.

6. The method according to claim 1, characterized in that, The method further includes: A smelting process prediction model is constructed based on an LSTM neural network. The input variables of the smelting process prediction model include the temperature of the refined aluminum liquid, the rotation speed of the furnace body, and the heat wave of the hot ash. The smelting process prediction model outputs the burner air-fuel ratio, charging timing, and stirring frequency based on input variables, so that the smelting furnace can adjust the gas flow rate in real time according to the burner air-fuel ratio.

7. The method according to any one of claims 1 to 6, characterized in that, The modified smelting furnace is obtained by improving the traditional fixed smelting furnace into a horizontal rotary furnace body, and adding an embedded heat pipe array to the inner wall of the horizontal rotary furnace body. The heat pipes are used to connect with the external multi-stage heat exchanger to form a continuous heat conduction path.

8. The method according to claim 7, characterized in that, The novel composite solvent comprises a fluoride-chloride eutectic system.

9. The method according to claim 8, characterized in that, The preset temperature range includes 720°C to 750°C.

10. A recycled aluminum system, characterized in that, The system includes: The recycled aluminum raw material acquisition module is used to acquire recycled aluminum raw materials; The recycled aluminum raw material refining module is used to place the recycled aluminum raw material in the modified smelting furnace and heat the modified smelting furnace to a preset temperature range so that the recycled aluminum raw material is melted into molten recycled aluminum. Simultaneously, the rotation speed of the furnace body of the modified smelting furnace is controlled so that the molten recycled aluminum is tumbled under the action of centrifugal force in the furnace body to obtain refined aluminum liquid. The physical purification module for recycled aluminum is used to cool the refined aluminum liquid into recycled aluminum ingots. The recycled aluminum ingots are separated by particle size through the excitation force of the high-frequency vibrating screen, and the recycled aluminum ingots are simultaneously sorted by density using an air classifier until the recycled aluminum particles and impurities in the recycled aluminum ingots are separated. The recycled aluminum chemical purification module is used to heat the separated recycled aluminum particles to a preset temperature range to obtain molten aluminum. A novel composite solvent is added to the molten aluminum to dissolve the metal compounds that need to be dissolved in the molten aluminum, thereby obtaining purified molten aluminum. The metal compounds include aluminum oxide. The recycled aluminum module is used to cool and cast purified molten aluminum into ingots to obtain recycled aluminum ingots.

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