Methods for regulating recycled aluminum

Abstract

The present invention provides a method for regulating recycled aluminum, comprising the following steps: providing recycled aluminum and manganese (Mn); performing a first heating treatment on the recycled aluminum to obtain a recycled aluminum liquid; performing a chemical analysis on the recycled aluminum liquid to obtain an Fe content in the recycled aluminum liquid; calculating the mass of Mn to be added to the recycled aluminum liquid according to the mass of the recycled aluminum, the Fe content, and a preset mass ratio of Mn to Fe, wherein the preset mass ratio of Mn to Fe is 0.5-2:1; and adding Mn to the recycled aluminum liquid, performing a second heating treatment, and performing electromagnetic stirring and slagging treatment to obtain an aluminum alloy liquid.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloys, and in particular to a method for regulating recycled aluminum. Background Art

[0002] Recycled aluminum comes from complex sources and has a relatively high Fe content. The Fe impurity in recycled aluminum forms needle- or flaky-shaped β-iron-rich phases. When aluminum castings made from recycled aluminum are subjected to stress, these iron-rich phases can severely fracture the aluminum matrix, causing a sharp drop in the casting's plasticity. This severely impacts the casting's quality, subsequent processing performance, and range of applications, significantly restricting the recycling of scrap aluminum and the sustainable development of aluminum resources.

[0003] Currently, chemical methods are commonly used to control recycled aluminum, reducing the Fe content or modifying the Fe morphology in the recycled aluminum to reduce the impact of the iron-rich phase on aluminum castings. However, the effect of these chemical methods on the control of recycled aluminum is not ideal. Summary of the Invention

[0004] In view of the above-mentioned defects of the prior art, the present invention provides a method for regulating recycled aluminum, aiming to effectively regulate recycled aluminum and obtain aluminum alloys with excellent comprehensive properties.

[0005] The present invention provides a method for regulating recycled aluminum, comprising the following steps:

[0006] Provide recycled aluminum and Mn;

[0007] performing a first heating treatment on the regenerated aluminum to obtain regenerated aluminum liquid;

[0008] Assaying the regenerated aluminum liquid to obtain the Fe content of the regenerated aluminum liquid;

[0009] Calculating the mass of Mn to be added to the regenerated aluminum liquid based on the mass of the regenerated aluminum, the Fe content, and a preset mass ratio of Mn to Fe, wherein the preset mass ratio of Mn to Fe is 0.5-2:1; and

[0010] Mn is added to the regenerated aluminum liquid, and a second heating treatment is performed, followed by electromagnetic stirring and slag removal to obtain an aluminum alloy liquid.

[0011] Furthermore, at least one of the following conditions is met:

[0012] The preset mass ratio of Mn to Fe is 0.6-1.6:1;

[0013] The temperature of the first heating treatment is 680-720°C;

[0014] The temperature of the second heating treatment is 740-780°C;

[0015] The mass percentage content of Mn in the aluminum alloy liquid is 0.1-2%.

[0016] Furthermore, the method for regulating recycled aluminum further comprises: adding Cr to the regenerated aluminum liquid when adding Mn to the regenerated aluminum liquid, wherein the mass percentage content of Cr in the aluminum alloy liquid is 0-0.4%.

[0017] Furthermore, the method for regulating recycled aluminum further comprises: adding RE to the regenerated aluminum liquid when adding Mn to the regenerated aluminum liquid, wherein the mass percentage content of RE in the aluminum alloy liquid is 0-0.8%.

[0018] Furthermore, the method for regulating recycled aluminum further comprises: when adding Mn to the recycled aluminum liquid, adding at least one of Co, Be and Ca to the recycled aluminum liquid, wherein at least one of the following conditions is met:

[0019] The mass percentage content of Co in the aluminum alloy liquid is 0-1%;

[0020] In the aluminum alloy liquid, the mass percentage content of Be is 0-0.1%;

[0021] In the aluminum alloy liquid, the mass percentage content of Ca is 0-0.1%.

[0022] Furthermore, before the step of "adding Mn to the regenerated aluminum liquid", the method for regulating the regenerated aluminum further comprises: adding B to the regenerated aluminum liquid, wherein the mass percentage content of B in the aluminum alloy liquid is 0-1%.

[0023] Furthermore, after the step of "adding Mn to the regenerated aluminum liquid", the method for regulating the regenerated aluminum further comprises: adding Ti and Sr to the regenerated aluminum liquid, wherein the mass percentage content of Ti in the aluminum alloy liquid is 0-1.5%, and the mass percentage content of Sr is 0-0.5%.

[0024] Furthermore, after the step of “adding Mn to the regenerated aluminum liquid”, the method for regulating the regenerated aluminum further comprises: adding C to the regenerated aluminum liquid, wherein the mass percentage content of C in the aluminum alloy liquid is 0-0.5%.

[0025] Furthermore, after the step of “adding Mn to the regenerated aluminum liquid”, the method for regulating the regenerated aluminum further comprises the step of adding at least one of Nb, Ni, Te, In, Mo, Ag, Cd, and V to the regenerated aluminum liquid.

[0026] Furthermore, at least one of the following conditions is met:

[0027] In the aluminum alloy liquid, the mass percentage content of Nb is 0-0.3%;

[0028] In the aluminum alloy liquid, the mass percentage content of Ni is 0-0.5%;

[0029] In the aluminum alloy liquid, the mass percentage content of Te is 0-0.5%;

[0030] In the aluminum alloy liquid, the mass percentage content of In is 0-0.5%;

[0031] In the aluminum alloy liquid, the mass percentage content of Mo is 0-0.5%;

[0032] In the aluminum alloy liquid, the mass percentage content of Ag is 0-0.1%;

[0033] In the aluminum alloy liquid, the mass percentage content of Cd is 0-0.5%;

[0034] In the aluminum alloy liquid, the mass percentage content of V is 0-0.1%.

[0035] In the technical solution of the present invention, the regenerated aluminum liquid can be tested to obtain the Fe content of the regenerated aluminum liquid, and then the mass of Mn to be added to the regenerated aluminum liquid can be calculated based on the mass of the regenerated aluminum, the Fe content, and the preset mass ratio of Mn to Fe. The preset mass ratio of Mn to Fe is 0.5-2:1. Within this mass ratio range, Mn can significantly refine the recrystallized grains and the second phase, effectively transforming the coarse needle-shaped or flaky β-AlFeSi phase into small granular α-Al(FeMn)Si dispersed particles to improve the Fe morphology. It can also react with Fe to form α-(Fe,Mn)Al6 phase to reduce the Fe content, so that the aluminum alloy obtained after regulation has better comprehensive properties (including mechanical properties and electrical conductivity, etc.). DETAILED DESCRIPTION

[0036] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] The present invention provides a method for regulating recycled aluminum, comprising the following steps:

[0038] Provide recycled aluminum and Mn;

[0039] performing a first heating treatment on the recycled aluminum at a temperature of 680-720° C. to obtain recycled aluminum liquid;

[0040] Assaying the regenerated aluminum liquid to obtain the Fe content of the regenerated aluminum liquid;

[0041] Calculating the mass of Mn to be added to the regenerated aluminum liquid based on the mass of the regenerated aluminum, the Fe content, and a preset mass ratio of Mn to Fe, wherein the preset mass ratio of Mn to Fe is 0.5-2:1;

[0042] Adding Mn to the regenerated aluminum liquid, performing a second heating treatment at a temperature of 740-780° C., and performing electromagnetic stirring and slagging treatment to obtain an aluminum alloy liquid; and

[0043] The aluminum alloy liquid is subjected to a forming process to obtain an aluminum alloy.

[0044] Recycled aluminum is aluminum alloy extracted by remelting scrap aluminum and scrap aluminum alloy materials, or remelting aluminum-containing waste.

[0045] On the one hand, electromagnetic stirring can accelerate the dissolution of Mn, and on the other hand, it can also make more Mn and Fe participate in the reaction evenly, generating a more dispersed and fine α-Al(FeMn)Si phase, thereby improving the effect of modifying Fe.

[0046] Before the recycled aluminum undergoes the first heat treatment, it can undergo pretreatment, such as sorting, crushing, magnetic separation for iron removal, and cleaning. The recycled aluminum can also undergo a preliminary test of its composition and content, using a photoelectric direct reading spectrometer or chemical analysis. This allows recycled aluminum with similar composition and content to be blended based on the test results, avoiding situations where the blended recycled aluminum has an overly complex composition, excessive or substandard content of certain elements.

[0047] Before testing the regenerated aluminum liquid, it may undergo a refining treatment to remove surface scum and impurities. The refining temperature is 690-750°C for 10-20 minutes. The refining agent may include the following raw materials in parts by weight: 60-70 parts KF, 50-60 parts NaCl, 40-60 parts LiCl, 20-25 parts cryolite, 10-25 parts AIF3, 10-15 parts CaF2, 5-10 parts light calcium carbonate, 15-20 parts graphite powder, 10-20 parts talc, 20-30 parts MgCl2, and 10-30 parts rare earth salt. The rare earth salt may be a combination of one or more of a light rare earth chloride, fluoride, or nitric acid compound. The rare earth salt may be a combination of one or more of a heavy rare earth chloride, fluoride, or nitric acid compound. The mass ratio of the refining agent to the regenerated aluminum liquid is 0.0013-0.0018:1.

[0048] The preset mass ratio of Mn to Fe is preferably 0.6-1.6: 1. The preset mass ratio of Mn to Fe may be 0.5: 1, 0.6: 1, 0.7: 1, 0.8: 1, 0.9: 1, 1: 1, 1.1: 1, 1.2: 1, 1.3: 1, 1.14: 1, 1.5: 1, 1.6: 1, 1.7: 1, 1.8: 1, 1.9: 1, or 2: 1.

[0049] In the aluminum alloy liquid, the mass ratio of Mn to Fe may be 0.5-2:1, preferably 0.6-1.6:1, specifically 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, 1.3:1, 1.14:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, or 2:1.

[0050] Mn can be added in the form of a single substance or an alloy (such as an Al-Mn master alloy). The Al-Mn master alloy has good dispersibility and is easily dissolved in the recycled aluminum liquid. In the aluminum alloy liquid, the mass percentage of Mn is 0.1-2%, specifically 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2%. For low-iron recycled aluminum, only Mn can be added for regulation. Mn can transform the coarse needle-shaped β-AlFeSi phase into small granular α-Al(FeMn)Si phase dispersed particles, which can improve the Fe morphology and eliminate the adverse effects of Fe. Specifically, Mn can replace part of the Fe in the coarse, needle-shaped β-AlFeSi phase, generating a small, dispersed β-Al(FeMn)Si phase. This improves the formation and growth of the β phase, thereby reducing the deleterious effects of Fe. Mn can also promote the transformation of the needle-shaped β-Al(FeMn)Si phase into a small, dispersed α-Al(FeMn)Si phase during the homogenization process. The α-Al(FeMn)Si dispersed phase can hinder grain growth after hot deformation, thereby improving the overall properties of the aluminum alloy (including but not limited to mechanical properties, electrical conductivity, and plasticity). The generated α-Al(FeMn)Si phase dispersed particles are distributed in the aluminum matrix and strongly pinned to the subgrain boundaries of the aluminum alloy. This is mainly because the Mn-containing α phase dispersed particles in the aluminum alloy can serve as non-uniform nucleation sites for the β' phase during aging, inducing its nucleation, thereby accelerating the precipitation of the β' phase. Mn can also prevent the recrystallization process of recycled aluminum, increase the recrystallization temperature, and significantly refine the recrystallized grains. Among them, Mn refines the recrystallized grains mainly through MnAl6 dispersed particles to hinder the growth of recrystallized grains. MnAl6 can also dissolve Fe to form α-(Fe, Mn)Al6 phase, thereby reducing the Fe content and reducing the harmful effects of Fe.

[0051] The electromagnetic stirring frequency is 10-30 Hz and the duration is 1-10 min. The electromagnetic stirring treatment can refine the grains and change the morphology of the Fe phase (e.g., it can transform the long needle-like or massive Al(FeMn)Si phase into a dispersed nano-spherical Al(MnFe)Cu phase).

[0052] The forming process may be die casting, rolling, extrusion, drawing, forging, spinning, forming (such as cold stamping, cold deformation, deep drawing, etc.), and deep processing (lathing, stamping, drilling, tapping, etc.).

[0053] In the technical solution of the present invention, the regenerated aluminum liquid can be tested to obtain the Fe content of the regenerated aluminum liquid, and then the mass of Mn to be added to the regenerated aluminum liquid can be calculated based on the mass of the regenerated aluminum, the Fe content, and the preset mass ratio of Mn to Fe. The preset mass ratio of Mn to Fe is 0.5-2:1. Within this mass ratio range, Mn can significantly refine the recrystallized grains and the second phase, effectively transforming the coarse needle-shaped or flaky β-AlFeSi phase into small granular α-Al(FeMn)Si dispersed particles to improve the Fe morphology. It can also react with Fe to form α-(Fe,Mn)Al6 phase to reduce the Fe content, so that the aluminum alloy obtained after regulation has better comprehensive properties (including mechanical properties and electrical conductivity, etc.).

[0054] Before adding Mn to the regenerated aluminum liquid, B may be added to the regenerated aluminum liquid at a temperature of 710-740°C and electromagnetically stirred. When adding Mn to the regenerated aluminum liquid, Cr and / or RE may be added to the regenerated aluminum liquid at the same time and electromagnetically stirred. After adding Mn to the regenerated aluminum liquid, at least one of Ti, Sr, and C may be added to the regenerated aluminum liquid at a temperature of 700-760°C and electromagnetically stirred.

[0055] On the one hand, electromagnetic stirring can accelerate the dissolution of Mn and other alloy elements, and on the other hand, it can also allow more Mn to react with Fe to generate a more dispersed and fine α-Al(FeMn)Si phase, thereby improving the effect of modifying Fe.

[0056] Cr, RE, B, Ti, Sr, and C can be added in the form of simple substances or alloys (such as Al-Cr master alloy, Al-RE master alloy, Al-B master alloy, Al-Ti master alloy, Al-Ti-C master alloy, Al-Ti-B master alloy, Ti-CB master alloy, Al-Sr master alloy, or Al-C master alloy). The master alloy has good dispersibility and is easy to dissolve in the recycled aluminum liquid.

[0057] In the aluminum alloy liquid, the mass percentage of Cr is 0-0.4%, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, or 0.4%. Cr can transform the needle-shaped β-Fe phase into the α-Fe phase to improve the Fe morphology and eliminate the harmful effects of Fe. It can also easily form a dispersed phase with Fe to reduce the Fe content and reduce the harmful effects of Fe. Cr forms (CrFe)Al7 and (CrMn)Al in the recycled aluminum liquid. 12 Intermetallic compounds such as Cr can hinder the nucleation and growth of recrystallization, improving the toughness, tensile strength, and elongation of recycled aluminum and reducing its susceptibility to stress corrosion cracking. The various fine chromium-containing compounds formed by Cr in aluminum alloys can redissolve in the α phase during the solution stage and disperse and precipitate various Cr-containing phases, such as α-AlCrSi dispersed phases, during the aging stage. These Cr-containing phases serve as nuclei for the heterogeneous nucleation of the θ′ phase, accelerating its formation and improving the mechanical properties and thermal stability of the recycled aluminum. Furthermore, the dispersed precipitation of Cr-containing phases in the matrix inevitably delays the formation of the θ′ phase at grain boundaries. Furthermore, Mn and Cr can form a dispersed α-Al(FeMnCr)Si phase with Fe and Si. This α-Al(FeMnCr)Si phase has a high bulk density and strong thermal stability, pinning grain boundaries and inhibiting recrystallization. This effectively controls the recovery, recrystallization behavior, and grain growth of recycled aluminum after hot deformation, thereby controlling grain size.

[0058] In the aluminum alloy liquid, the mass percentage content of RE is 0-0.8%, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, or 0.8%. RE can be at least one of La, Ce, Pr, Nd, Er, Sm, Y, and Gd. RE is consistent with the distribution area of ​​the Fe phase, and can form a rare earth active film on the surface of the Fe phase to prevent the formation of a hard and brittle β-AlFeSi phase on the grain boundary. RE is a surface active element with a radius larger than that of Al. It cannot enter the α-Al lattice, but can be segregated on the grain boundary or adsorbed on the solid-liquid interface to form partial supercooling, which increases the chance of dendrite melting and thus refines the grains.

[0059] The mass ratio of Mn to Cr is 1-15:1, preferably 3-10:1, and specifically can be 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, or 15:1.

[0060] The mass ratio of Mn to RE is 1-80:1, preferably 5-50:1, and specifically can be 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, or 15:1, 20:1, 25:1, 30:1, 35:1, 40:1, 45:1, 50:1, 55:1, 60:1, 65:1, 70:1, 75:1, or 80:1.

[0061] In the recycled aluminum melt, the ratio of the sum of the mass of Mn, Cr, and RE to the mass of Fe is 0.8-3:1, specifically 0.8:1, 0.9:1, 1:1, 1.2:1, 1.4:1, 1.6:1, 1.8:1, 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1, or 3:1. The mass ratio of Mn, Cr, and RE added to the recycled aluminum melt can be 1-30:0.1-10:1, preferably 5-15:0.5-2:1. At this ratio, Mn, Cr, and RE can effectively improve iron morphology, reduce iron content, and refine crystals and secondary phases. The mass ratio of Mn, Cr, and RE can be specifically 1:0.1:1, 1:0.5:1, 1:1:1, 1:5:1, 1:10:1, 5:0.1:1, 5:0.5:1, 5:1:1, 5:5:1, 5:10:1, 10:0.1:1, 10:0.5:1, 10:1:1, 10:5:1, 10:10:1, 20:0.1:1, 20:0.5:1, 20:1:1, 20:5:1, 20:10:1, 30:0.1:1, 30:0.5:1, 30:1:1, 30:5:1, or 30:10:1.

[0062] In the aluminum alloy liquid, the mass percentage content of B is 0-1%, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1%. It is understood that when Ti or C is added in the form of an Al-Ti-B master alloy or a Ti-CB master alloy, B is also added. In this case, the total mass percentage content of B is 0-0.5%, and the mass percentage content of B added in the form of an Al-Ti-B master alloy and / or a Ti-CB master alloy is not greater than 0.05%. B can undergo a boronization reaction with Fe to form a boron-iron compound that can be separated from the regenerated aluminum liquid, thereby reducing the Fe content. B is easily adsorbed on the surface of the iron-rich phase, inhibiting the growth of the iron-rich phase, controlling the size of the iron-rich phase, and preventing the formation of the iron-rich phase in the regenerated aluminum liquid. B can inhibit the segregation of Ti3Al, so the effect is better when Ti and B are used together. The addition of B can increase the elongation of recycled aluminum, but reduce the tensile strength of recycled aluminum.

[0063] The mass ratio of Mn to B is 1-30:1, preferably 5-20:1, and more preferably 10-15:1. At this ratio, Mn and B interact to effectively reduce the Fe content, improve Fe morphology, and refine grains and secondary phases. Specifically, the mass ratio of Mn to B can be 1:1, 5:1, 10:1, 15:1, 20:1, 25:1, or 30:1.

[0064] In the aluminum alloy liquid, the mass percentage of Ti is 0-1.5%, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, or 1.5%. Ti reacts with Al to form a TiAl3 phase, which serves as a non-spontaneous nucleus during crystallization, thereby refining the casting structure and weld structure.

[0065] In the aluminum alloy liquid, the mass percentage content of Sr is 0-0.5%, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%. Sr can change the behavior of the intermetallic compound phase in crystallography. Therefore, Sr can be used as a modifier to modify the recycled aluminum through the heterogeneous nucleation theory or the twin valley mechanism, which has the advantages of long effective modification time, good effect and reproducibility. Sr preferentially combines with Fe to form dispersion strengthening, reducing the solid solubility of Fe in the recycled aluminum, thereby improving the strengthening effect and electrical conductivity of the recycled aluminum. Sr can also transform the coarse needle-shaped β-AlFeSi and β-AlFeMnSi phases in the ingot into small granular Chinese character-shaped α-AlFeSi and α-Al(FeMn)Si phases, reducing the ingot homogenization time and improving the mechanical properties of the recycled aluminum.

[0066] The mass ratio of Ti to Sr is 1-50:1, preferably 10-30:1, and specifically can be 1:1, 2:1, 5:1, 10:1, 15:1, 20:1, 25:1, 30:1, 35:1, 40:1, 45:1, or 50:1.

[0067] The mass ratio of Mn, Ti, Sr, and B is 1-20:0.5-10:0.1-1:1, and can be specifically 1:0.5:0.1:1, 1:1:0.5:1, 1:5:1:1, 1:10:1:1, 5:0.5:0.1:1, 5:1:0.5:1, 5:5:1:1, 5:10:1:1, 10:0.5:0.1:1, 10:1:0.5:1, 10:5:1:1, 10:10:1:1, 20:0.5:0.1:1, 20:1:0.5:1, 20:5:1:1, 20:10:1:1, 30:0.5:0.1:1, 30:1:0.5:1, 30:5:1:1, or 30:10:1:1.

[0068] The aluminum alloy liquid has a carbon content of 0-0.5% by mass, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%. Carbon acts as a refiner to increase the elongation of the recycled aluminum and also as a highly effective modifier, reacting with Fe during heat treatment to form carbides, thereby improving the mechanical properties of the recycled aluminum.

[0069] The mass ratio of Mn to C is 1-30:1, specifically 1:1, 5:1, 10:1, 15:1, 20:1, 25:1, or 30:1. Within this ratio range, Mn and C interact with each other to effectively reduce the Fe content, improve Fe morphology, and refine grains and secondary phases.

[0070] The elements and their contents added to the recycled aluminum liquid can be adjusted based on the type of recycled aluminum to be regulated and the Fe content in the recycled aluminum. For example, for heat-treatment-free recycled aluminum, the Fe content needs to be strictly controlled. In this case, Mn and Cr can be added, and RE can also be added. For low-iron recycled aluminum, only Mn can be added. For high-iron recycled aluminum, Mn can be added, and Cr and / or RE can also be added, and B can be added to reduce the Fe content. Of course, whether the recycled aluminum is low-iron or high-iron, Cr and / or RE can be added along with Mn.

[0071] The combined effect of Mn, Cr and RE can effectively improve the Fe morphology, reduce the Fe content and refine the grain size, so as to obtain an aluminum alloy with better comprehensive properties (specifically, the aluminum alloy obtained after regulation has better mechanical properties and electrical conductivity). Specifically, Mn can significantly refine the recrystallized grains and the second phase, effectively transforming the coarse needle-shaped or flaky β-AlFeSi phase into small granular α-Al(FeMn)Si dispersed particles to improve the Fe morphology, and can also react with Fe to form α-(Fe,Mn)Al6 phase to reduce the Fe content. Obviously, Mn can reduce the Fe content, improve the Fe morphology, and refine the grains and the second phase. Cr can effectively transform the needle-shaped β-Fe phase into the α-Fe phase to improve the Fe morphology, and can also react with Fe to form (CrFe)Al7 and (CrMn)Al 12 The presence of RE reduces the Fe content by forming dispersed phases such as AlCrSi and Mg(SiCr), increasing the precipitation volume fraction and uniformity of these dispersed phases and improving the alloy's mechanical properties. RE is distributed in the same region as the Fe phase, allowing for the formation of a rare earth active film on the Fe phase surface, preventing the formation of the hard, brittle β-AlFeSi phase at grain boundaries. Furthermore, Mn significantly refines recrystallized grains, while Cr hinders the nucleation and growth of recrystallization, refining grains and secondary phases. RE also refines grains. The combined addition of Mn, Cr, and RE effectively improves Fe morphology. When added together, Mn and Cr react with Fe and Si to form a dispersed α-Al(FeMnCr)Si phase, which exhibits high bulk density and strong thermal stability. With extended stabilization time, these phases partially sink to the bottom and partially pin grain boundaries, inhibiting recrystallization and effectively refining and controlling grain size. In summary, the Mn, Cr, and RE content ranges mentioned above work synergistically with each other to improve the Fe morphology and reduce the Fe content while also refining the grains, thereby obtaining an aluminum alloy with excellent comprehensive properties.

[0072] Boron not only prevents the formation of iron-rich phases but also undergoes a boriding reaction with Fe, resulting in the formation of Fe2B phases that sink to the bottom, effectively reducing the Fe content in the recycled aluminum liquid. Furthermore, Ti reacts with B to form TiB2 phases, which serve as non-spontaneous nuclei during crystallization, refining grains and secondary phases. Sr crystallographically alters the behavior of intermetallic compound phases and can be used as a modifier to refine grains and secondary phases through the heterogeneous nucleation theory or twin valley mechanism. This modification offers advantages such as a long effective time, good results, and reproducibility. Ti reacts with Al to form TiAl3 phases, which serve as non-spontaneous nuclei during crystallization, refining grains and secondary phases. C, as a refiner, significantly refines grains and secondary phases. Ti, C, B, and Sr work together to effectively refine grains and secondary phases. B inhibits the segregation of Ti3Al, so Ti and B are most effective when used together, effectively reducing Fe content and refining grains and secondary phases. The combination of RE, Ti, and B prevents TiB2 from agglomerating and precipitating, ensuring an effective TiB2 quantity. B, combined with Mn, Cr, and RE, prevents the formation of iron-rich phases, allowing the appropriate amount of Mn, Cr, or RE to be added to the recycled aluminum melt to be calculated in advance based on the Fe content in the recycled aluminum. This eliminates the concern that the continued formation of iron-rich phases in the recycled aluminum will hinder the effective removal of β-Fe phases. Ti and / or C, and Sr complement B, Mn, Cr, and RE, further refining grains and secondary phases and reducing the size of the α-Fe phase. Sr preferentially combines with elements like Fe, Cu, and Si to form dispersion strengthening, reducing the distribution of Cr, Mn, and Cu at grain boundaries and reducing their solid solubility in the alloy, thereby improving the overall performance of the alloy. In summary, Mn, Cr, RE, B, Ti, C, and Sr in the above content ranges act synergistically with each other, improving the Fe morphology and reducing the Fe content while also refining the grains and the second phase, thereby obtaining an aluminum alloy with excellent comprehensive performance.

[0073] In addition, B can refine grains; Mn can significantly refine recrystallized grains; Cr can also form an α-Al(FeCr)Si dispersed phase with Fe, reducing the Fe content and mitigating the deleterious effects of Fe. Cr can also hinder the nucleation and growth of recrystallization, refining grains and secondary phases; RE can also refine grains; C can react with Fe to form carbides, reducing the Fe content; Sr can combine with Fe to form dispersion strengthening, reducing the Fe content and transforming the coarse, needle-shaped β-AlFeSi phase into small, granular, Chinese-shaped α-AlFeSi phase, improving the Fe morphology. Clearly, the effects of B, Mn, Cr, RE, C, Ti, and Sr at least partially overlap. The Fe content, Fe morphology, and grain and secondary phase size are affected by the aforementioned elements and their contents. When one or more of these elements are added in insufficient amounts, it is difficult to effectively reduce the Fe content, improve the Fe morphology, and refine the grains and secondary phases. When one or more of these elements are added in excessive amounts, it is also difficult to effectively reduce the Fe content, improve the Fe morphology, and refine the grains and secondary phases. The effects of Mn, Cr, RE, B, Ti, C, and Sr at least partially overlap, so that the content of at least one of Mn, Cr, RE, B, Ti, C, and Sr can be set higher or lower (higher than the content in the prior art or lower than the content in the prior art, or higher than the content in the prior art or lower than the content in the prior art) without worrying about the regulation effect.

[0074] When adding Mn to the regenerated aluminum liquid, at least one of Co, Be and Ca may be added to the regenerated aluminum liquid at the same time, and electromagnetic stirring may be performed.

[0075] On the one hand, electromagnetic stirring can accelerate the dissolution of Mn and other alloy elements, and on the other hand, it can also allow more Mn to react with Fe to generate a more dispersed and fine α-Al(FeMn)Si phase, thereby improving the effect of modifying Fe.

[0076] The addition of elements such as Cr, RE, Co, Be, and Sr can not only further promote the reaction between Mn and Fe by reducing their maximum solid solubility in the matrix, but also occupy the positions of Mn and Fe elements in the second phase. By controlling the second phase structure, the Fe-containing phase is made more dispersed and fine, which can further promote the effect of modifying Fe. Therefore, when the mass ratio of Mn to Fe is greater than 1.2:1, the α-Al(MnFeX)Si phase (where X is any one or more of the elements Cr, RE, Co, Be, Sr, etc.) can still remain fine and dispersed, and there is no excess Mn and Al to form a coarse AlMn phase.

[0077] The mass percentage of Co in the aluminum alloy liquid is 0-1%, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1%. Co can promote the formation of Fe ball phase, generate small-sized Al3(Fe,Co) phase that can improve the mechanical properties of the aluminum alloy, and can also transform coarse needle-shaped and flake-shaped Al3Fe phase into α-Al 15 (Fe, Co) 3 Si2 (its shape can be granular, small flower-shaped or small strips), and has a refining effect on the Al3Fe phase, further improving the mechanical properties, thermal stability, creep resistance, and plasticity of the aluminum alloy. Adding Ce and Co at the same time can not only improve the thermal stability of recycled aluminum, but also promote <001> and <111> The mechanical properties of recycled aluminum can be improved by forming an orientation.

[0078] The aluminum alloy liquid contains Be in a mass percentage range of 0-0.1%, specifically 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, or 0.1%. Be can refine grains, and the refining effect increases with increasing Be content. A small amount of Be can transform the needle-shaped β-Fe phase into a spherical α-BeFe phase and prevent the formation of the needle-shaped β-Fe phase.

[0079] The aluminum alloy liquid has a Ca content of 0-0.1% by mass, specifically 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, or 0.1%. Ca can remove hydrogen from the recycled aluminum liquid, refine grains and secondary phases, and improve the morphology of the β-Fe phase and eutectic silicon.

[0080] The mass ratio of Mn to Co is 1-20:1, specifically 1:1, 5:1, 10:1, 15:1, or 20:1.

[0081] The mass ratio of Mn to Ca is 2-50:1, specifically 2:1, 5:1, 10:1, 15:1, 20:1, 25:1, 30:1, 35:1, 40:1, 45:1, or 50:1.

[0082] The mass ratio of Mn to Be is 2-50:1, specifically 2:1, 5:1, 10:1, 15:1, 20:1, 25:1, 30:1, 35:1, 40:1, 45:1, or 50:1.

[0083] Co, Be and Ca can be added in the form of simple elements or master alloys (such as Al-Co master alloy, Al-Be master alloy, Al-Ca master alloy). Master alloys have good dispersibility and are easily dissolved in the recycled aluminum liquid.

[0084] After adding Mn to the regenerated aluminum liquid, the method for regulating the regenerated aluminum further includes: adding at least one of Nb, Ni, Te, In, Mo, Ag, Cd, and V to the regenerated aluminum liquid and performing electromagnetic stirring.

[0085] On the one hand, electromagnetic stirring can accelerate the dissolution of Mn and other alloy elements, and on the other hand, it can also allow more Mn to react with Fe to generate a more dispersed and fine α-Al(FeMn)Si phase, thereby improving the effect of modifying Fe.

[0086] The aluminum alloy melt contains Nb in an amount of 0-0.3% by mass, specifically 0.01%, 0.05%, 0.1%, 0.2%, or 0.3%. Nb refines grains and secondary phases, thereby improving the elongation of the aluminum alloy. The mass ratio of Mn to Nb is 1-25:1, specifically 1:1, 5:1, 10:1, 15:1, 20:1, or 25:1.

[0087] The aluminum alloy liquid contains nickel in an amount of 0-0.5% by mass, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%. Ni refines grains, promotes the precipitation of secondary phases, and increases the volume fraction and dispersion of precipitated phases. Ni also reacts with Al, Fe, Mg, Si, and other materials to form secondary phases such as AlFeSiNi, AlFeMgSiNi, and FeNiAl9, thereby reducing the Fe content. The mass ratio of Mn to Ni is 1-20:1, specifically 1:1, 5:1, 10:1, 15:1, or 20:1.

[0088] The aluminum alloy liquid contains Te in a mass percentage range of 0-0.5%, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%. Te can narrow the solidification temperature range of the aluminum alloy, forming fine, petal-shaped rather than dendritic primary crystals, reducing or eliminating microshrinkage, thereby improving the mechanical properties and thermal conductivity of the aluminum alloy. The mass ratio of Mn to Te is 1-20:1, specifically 1:1, 5:1, 10:1, 15:1, or 20:1.

[0089] The aluminum alloy melt contains In by weight in a range of 0-0.5%, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%. In refines grains and secondary phases, thereby improving the elongation of the aluminum alloy. The mass ratio of Mn to In is 1-20:1, specifically 1:1, 5:1, 10:1, 15:1, or 20:1.

[0090] The aluminum alloy liquid contains Mo in a mass percentage of 0-0.5%, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%. Mo can refine grains, improve the morphology of Fe-containing intermetallic compounds, and further enhance the mechanical properties of the aluminum alloy. Mo can also react with Al, Si, Fe, etc. to form secondary phases such as AlMo, AlSiMo, and AlSiFeMo, which are dispersed at the grain boundaries of the aluminum matrix. The mass ratio of Mn to Mo is 1-20:1, specifically 1:1, 5:1, 10:1, 15:1, or 20:1.

[0091] In the aluminum alloy melt, the Cd content is 0-0.5% by mass, specifically 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%. Cd refines α-Al and forms a strengthening Mg2 (SiCdREFe) phase with Mg, RE, Si, Fe, etc., thereby reducing the Fe content. The mass ratio of Mn to Cd is 1-20:1, specifically 1:1, 5:1, 10:1, 15:1, or 20:1.

[0092] The aluminum alloy liquid contains Ag by weight in an amount of 0-0.1%, specifically 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, or 0.1%. Ag promotes the precipitation of a secondary phase and refines the precipitated phase. The mass ratio of Mn to Ag is 1-35:1, specifically 1:1, 5:1, 10:1, 15:1, 20:1, 25:1, 30:1, or 35:1.

[0093] In the aluminum alloy liquid, the mass percentage of V is 0-0.1%, specifically 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, or 0.1%. V forms VAl in the recycled aluminum. 11Refractory compounds such as Al3V and Al3V contribute to grain refinement and the formation of secondary phases during the casting process. Al3V is a non-stable phase that reacts with Cr, Si, and Ti in the recycled aluminum to form a large number of fine, dispersed, ellipsoidal Al(VCrTi)Si phases, which inhibit dislocation motion and recrystallization nucleation and growth, thereby refining the grains. The mass ratio of Mn to V ranges from 1 to 35:1, specifically 1:1, 5:1, 10:1, 15:1, 20:1, 25:1, 30:1, or 35:1.

[0094] The elements added to the recycled aluminum liquid can be collectively referred to as regulators, and the mass percentage content of the regulators in the aluminum alloy liquid can be 0.1-5%, specifically 0.1%, 0.2%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%.

[0095] Example 1

[0096] Provide 1kg of recycled aluminum and Mn;

[0097] Heating the recycled aluminum at 720° C. to obtain recycled aluminum liquid;

[0098] Refining the regenerated aluminum liquid to remove surface scum;

[0099] The regenerated aluminum liquid after the refining treatment is tested, and the mass percentage of Fe in the regenerated aluminum liquid is 0.5%;

[0100] Calculating the mass of Mn to be added to the regenerated aluminum liquid based on the mass of the regenerated aluminum, the Fe content, and a preset mass ratio of Mn to Fe, wherein the preset mass ratio of Mn to Fe is 0.5:1;

[0101] Adding Mn to the regenerated aluminum liquid at a temperature of 740° C., electromagnetically stirring and skimming to obtain aluminum alloy liquid; and

[0102] The aluminum alloy liquid is subjected to a forming process to obtain the aluminum alloy of Example 1. The aluminum alloy of Example 1 has an Fe content of 0.3%.

[0103] Example 2

[0104] Provide 1kg of recycled aluminum, Mn, and Cr;

[0105] Heating the recycled aluminum at 720° C. to obtain recycled aluminum liquid;

[0106] Refining the regenerated aluminum liquid to remove surface scum;

[0107] The regenerated aluminum liquid after the refining treatment is assayed, and the mass percentage content of Fe in the regenerated aluminum liquid is 1%;

[0108] Calculating the mass of Mn to be added to the regenerated aluminum liquid based on the mass of the regenerated aluminum, the Fe content, and a preset mass ratio of Mn to Fe, wherein the preset mass ratio of Mn to Fe is 2:1 and the mass percentage content of Cr is 0.1%;

[0109] Adding Mn and Cr to the regenerated aluminum liquid at a temperature of 750° C., electromagnetically stirring and skimming, to obtain aluminum alloy liquid; and

[0110] The aluminum alloy liquid is subjected to a forming process to obtain the aluminum alloy of Example 2, wherein the Fe content in the aluminum alloy of Example 2 is 0.5%.

[0111] Example 3

[0112] Provide 1kg of recycled aluminum, Mn, Cr, RE, and B;

[0113] Heating the recycled aluminum at 720° C. to obtain recycled aluminum liquid;

[0114] Refining the regenerated aluminum liquid to remove surface scum;

[0115] The regenerated aluminum liquid after the refining treatment was assayed, and the mass percentage content of Fe in the regenerated aluminum liquid was 1.8%;

[0116] Calculating the mass of Mn to be added to the regenerated aluminum liquid based on the mass of the recycled aluminum, the Fe content, and a preset mass ratio of Mn to Fe, wherein the preset mass ratio of Mn to Fe is 1.8:1, the mass percentage content of Cr is 0.2%, the mass percentage content of RE is 0.2%, and the mass percentage content of B is 0.2%;

[0117] Adding agent B to the regenerated aluminum liquid at a temperature of 710° C. and stirring, adding Mn, Cr, and RE to the regenerated aluminum liquid at a temperature of 760° C., electromagnetically stirring and skimming to obtain aluminum alloy liquid; and

[0118] The aluminum alloy liquid is subjected to a forming process to obtain the aluminum alloy of Example 3, wherein the Fe content in the aluminum alloy of Example 3 is 1%.

[0119] Example 4

[0120] Provide 1kg of recycled aluminum, Mn, Be, B, Ti, and Sr;

[0121] Heating the recycled aluminum at 680° C. to obtain recycled aluminum liquid;

[0122] Refining the regenerated aluminum liquid to remove surface scum;

[0123] The regenerated aluminum liquid after the refining treatment was assayed, and the mass percentage of Fe in the regenerated aluminum liquid was 2%;

[0124] Calculating the mass of Mn to be added to the regenerated aluminum liquid based on the mass of the recycled aluminum, the Fe content, and a preset mass ratio of Mn to Fe, wherein the preset mass ratio of Mn to Fe is 1:1, the mass percentage content of B is 0.8%, the mass percentage content of Be is 0.1%, the mass percentage content of Ti is 0.3%, and the mass percentage content of Sr is 0.1%;

[0125] Adding agent B to the regenerated aluminum liquid at a temperature of 720°C and stirring, adding Mn and Be to the regenerated aluminum liquid at a temperature of 770°C and stirring, then adding Ti and Sr to the regenerated aluminum liquid at a temperature of 700°C, electromagnetically stirring and skimming to obtain aluminum alloy liquid; and

[0126] The aluminum alloy liquid is subjected to a forming process to obtain the aluminum alloy of Example 4. The aluminum alloy of Example 4 has an Fe content of 1.1%.

[0127] Example 5

[0128] Provide 1kg of recycled aluminum, Mn, Cr, Co, Ca, B, Ti, C, and Nb;

[0129] Heating the recycled aluminum at 710° C. to obtain recycled aluminum liquid;

[0130] Refining the regenerated aluminum liquid to remove surface scum;

[0131] The regenerated aluminum liquid after the refining treatment was assayed, and the mass percentage content of Fe in the regenerated aluminum liquid was 1.5%;

[0132] The mass of Mn to be added to the regenerated aluminum liquid is calculated according to the mass of the recycled aluminum, the Fe content, and the preset mass ratio of Mn to Fe, wherein the preset mass ratio of Mn to Fe is 0.8:1, the mass percentage content of B is 0.6%, the mass percentage content of Cr is 0.4%, the mass percentage content of Co is 0.1%, the mass percentage content of Ca is 0.01%, the mass percentage content of Ti is 0.2%, the mass percentage content of C is 0.1%, and the mass percentage content of Nb is 0.2%;

[0133] Adding agent B to the regenerated aluminum liquid at a temperature of 730°C and stirring, adding Mn, Cr, Co, and Ca to the regenerated aluminum liquid at a temperature of 780°C and stirring, then adding Ti, C, and Nb to the regenerated aluminum liquid at a temperature of 750°C, electromagnetically stirring and skimming to obtain aluminum alloy liquid; and

[0134] The aluminum alloy liquid is subjected to a forming process to obtain the aluminum alloy of Example 5. The aluminum alloy of Example 5 has an Fe content of 0.9%.

[0135] Example 6

[0136] Provide 1kg of recycled aluminum, Mn, B, Mo, Nb, Ni, and Cd;

[0137] Heating the recycled aluminum at 690° C. to obtain recycled aluminum liquid;

[0138] Refining the regenerated aluminum liquid to remove surface scum;

[0139] The regenerated aluminum liquid after the refining treatment was assayed, and the mass percentage content of Fe in the regenerated aluminum liquid was 0.8%;

[0140] Calculating the mass of Mn to be added to the regenerated aluminum liquid based on the mass of the recycled aluminum, the Fe content, and a preset mass ratio of Mn to Fe, wherein the preset mass ratio of Mn to Fe is 1.3:1, the mass percentage content of B is 0.2%, the mass percentage content of Mo is 0.1%, the mass percentage content of Nb is 0.1%, the mass percentage content of Ni is 0.05%, and the mass percentage content of Cd is 0.05%;

[0141] Adding agent B to the regenerated aluminum liquid at a temperature of 740°C and stirring, adding Mn to the regenerated aluminum liquid at a temperature of 780°C and stirring, then adding Mo, Nb, Ni, and Cd to the regenerated aluminum liquid at a temperature of 760°C, electromagnetically stirring and skimming to obtain aluminum alloy liquid; and

[0142] The aluminum alloy liquid is subjected to a forming process to obtain the aluminum alloy of Example 6, wherein the Fe content in the aluminum alloy of Example 6 is 0.4%.

[0143] Comparative Example 1

[0144] Provide 1kg of recycled aluminum and Mn;

[0145] Heating the recycled aluminum at 740° C. to obtain recycled aluminum liquid;

[0146] Refining the regenerated aluminum liquid to remove surface scum;

[0147] The regenerated aluminum liquid after the refining treatment is tested, and the mass percentage of Fe in the regenerated aluminum liquid is 0.5%;

[0148] Calculating the mass of Mn to be added to the regenerated aluminum liquid based on the mass of the regenerated aluminum, the Fe content, and a preset mass ratio of Mn to Fe, wherein the preset mass ratio of Mn to Fe is 0.4:1;

[0149] adding Mn to the regenerated aluminum liquid at a temperature of 740° C., stirring and skimming to obtain aluminum alloy liquid; and

[0150] The aluminum alloy liquid is subjected to a forming process to obtain the aluminum alloy of Comparative Example 1, in which the Fe content of the aluminum alloy of Comparative Example 1 is 0.4%.

[0151] Comparative Example 2

[0152] Provide 1kg of recycled aluminum, Mn, and Cr;

[0153] Heating the recycled aluminum at 740° C. to obtain recycled aluminum liquid;

[0154] Refining the regenerated aluminum liquid to remove surface scum;

[0155] The regenerated aluminum liquid after the refining treatment is assayed, and the mass percentage content of Fe in the regenerated aluminum liquid is 1%;

[0156] Calculating the mass of Mn to be added to the regenerated aluminum liquid based on the mass of the regenerated aluminum, the Fe content, and a preset mass ratio of Mn to Fe, wherein the preset mass ratio of Mn to Fe is 0.4:1 and the mass percentage content of Cr is 0.1%;

[0157] adding Mn and Cr to the regenerated aluminum liquid at a temperature of 750° C., stirring and skimming to obtain aluminum alloy liquid; and

[0158] The aluminum alloy liquid is subjected to a forming process to obtain the aluminum alloy of Comparative Example 2, in which the Fe content of the aluminum alloy of Comparative Example 2 is 0.8%.

[0159] The properties of the aluminum alloys of Examples 1 to 6 and Comparative Examples 1 to 2 were tested. Please refer to Table 1 for the test results.

[0160] Table 1 Performance test results of aluminum alloys of Examples 1 to 6 and Comparative Examples 1 to 2

[0161]

[0162]

[0163] Table 1 shows that compared with the aluminum alloys of comparative examples 1 to 2, the aluminum alloys of embodiments 1 to 6 have better tensile strength and elongation after the adjustment and treatment.

[0164] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for regulating recycled aluminum, comprising the following steps: Provide recycled aluminum and Mn; performing a first heating treatment on the regenerated aluminum to obtain regenerated aluminum liquid; Assaying the regenerated aluminum liquid to obtain the Fe content of the regenerated aluminum liquid; Calculating the mass of Mn to be added to the regenerated aluminum liquid based on the mass of the regenerated aluminum, the Fe content, and a preset mass ratio of Mn to Fe, wherein the preset mass ratio of Mn to Fe is 1.5-2:1; Adding B to the regenerated aluminum liquid at a temperature of 710-740° C.; Mn, Cr, RE, Co, and Be are added to the regenerated aluminum liquid and subjected to a second heating treatment; Sr is added to the regenerated aluminum liquid at a temperature of 700-760°C, and after electromagnetic stirring and slag removal treatment, an aluminum alloy liquid is obtained. The temperature of the second heating treatment is 740-780°C. In the aluminum alloy liquid, the mass ratio of Mn to Fe is 1-2:1, the mass percentage content of B is 0.01-1%, the mass percentage content of Mn is 0.5-2%, the mass percentage content of Cr is 0.2-0.4%, the mass percentage content of RE is 0.01-0.8%, the mass percentage content of Co is 0.01-1%, the mass percentage content of Be is 0.01-0.1%, and the mass percentage content of Sr is 0.05-0.5%.

2. The method for regulating recycled aluminum according to claim 1, characterized in that: The temperature of the first heating treatment is 680-720°C.

3. The method for regulating recycled aluminum according to any one of claims 1 to 2, characterized in that: After "adding Mn, Cr, RE, Co, and Be to the regenerated aluminum liquid", the method for regulating the regenerated aluminum further includes: adding Ti to the regenerated aluminum liquid, wherein the mass percentage content of Ti in the aluminum alloy liquid is 0-1.5%.

4. The method for regulating recycled aluminum according to claim 3, characterized in that: After "adding Mn, Cr, RE, Co, and Be to the regenerated aluminum liquid", the method for regulating the regenerated aluminum further includes: adding C to the regenerated aluminum liquid, wherein the mass percentage content of C in the aluminum alloy liquid is 0-0.5%.

5. The method for regulating recycled aluminum according to any one of claims 1 to 2, characterized in that: After the step of "adding Mn, Cr, RE, Co, and Be to the regenerated aluminum liquid", the method for regulating the regenerated aluminum further comprises the step of adding at least one of Nb, Ni, Te, In, Mo, Ag, Cd, and V to the regenerated aluminum liquid.

6. The method for regulating recycled aluminum according to claim 5, characterized in that: Meet at least one of the following conditions: In the aluminum alloy liquid, the mass percentage content of Nb is 0-0.3%; In the aluminum alloy liquid, the mass percentage content of Ni is 0-0.5%; In the aluminum alloy liquid, the mass percentage content of Te is 0-0.5%; In the aluminum alloy liquid, the mass percentage content of In is 0-0.5%; In the aluminum alloy liquid, the mass percentage content of Mo is 0-0.5%; In the aluminum alloy liquid, the mass percentage content of Ag is 0-0.1%; In the aluminum alloy liquid, the mass percentage content of Cd is 0-0.5%; In the aluminum alloy liquid, the mass percentage content of V is 0-0.1%.

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