Efficient and environment-friendly aluminum alloy automobile part regeneration preparation method

Abstract

The invention discloses an efficient and environment-friendly aluminum alloy automobile part regeneration preparation method, and relates to the technical field of regenerated aluminum alloys. The method comprises the steps that the waste aluminum alloy automobile parts are classified, cleaned and crushed, and non-waste aluminum alloy impurities are removed; the waste aluminum alloy is placed in a coreless medium-frequency induction furnace to be melted into molten aluminum, then argon is introduced for degassing, ultrasonic stirring is carried out, and heat preservation is carried out for a period of time; a refining agent and a refiner are added into the molten aluminum, after ultrasonic stirring and heat preservation are conducted for a period of time, the surface of the molten aluminum is subjected to slagging-off and filtering; an intermediate alloy is added into the molten aluminum for component adjustment, argon is blown into the molten aluminum, and the alloy components are made to be uniform through ultrasonic stirring; the regenerated aluminum alloy is obtained through low-temperature casting forming; by means of the simple and reliable process, efficient and environment-friendly recycling of the waste aluminum alloy automobile parts is achieved, and the prepared regenerated aluminum alloy is uniform and fine in microstructure, uniform in second phase distribution, good in corrosion resistance and excellent in mechanical property.

Description

Technical Field

[0001] The invention belongs to the technical field of recycled aluminum alloys, and in particular relates to a highly efficient and environmentally friendly method for recycling and preparing aluminum alloy automobile parts. Background Art

[0002] With the rapid development of the automobile industry, aluminum alloy automobile parts are widely used due to their light weight and high strength. However, the problem that follows is the sharp increase in scrap aluminum alloy automobile parts. If these scrap parts are directly discarded without treatment, they will not only waste a lot of resources, but also cause serious pollution to the environment. Therefore, the development of an efficient and environmentally friendly aluminum alloy automobile parts regeneration preparation method is of great significance for resource recycling and environmental protection.

[0003] At present, the recycling of aluminum alloy automobile parts faces many challenges. On the one hand, scrap aluminum alloy parts often contain various impurities and pollutants, which will affect the performance and quality of recycled aluminum alloys. On the other hand, traditional recycling preparation processes often have problems of high energy consumption and heavy pollution, which do not meet the requirements of modern green manufacturing. Therefore, a method that can efficiently remove impurities, reduce energy consumption and pollution is needed to improve the performance and quality of recycled aluminum alloys.

[0004] The efficient and environmentally friendly aluminum alloy automobile parts recycling preparation method proposed in the present invention aims to solve the above problems. By optimizing the pretreatment process and smelting technology, impurities and pollutants in waste aluminum alloy parts are effectively removed, and the purity and performance of the recycled aluminum alloy are improved. At the same time, combined with innovative refining technology, energy consumption and pollution are reduced, and efficient and environmentally friendly recycling of aluminum alloy automobile parts is achieved. This method not only meets the requirements of green manufacturing, but also can provide the automotive industry with high-quality and high-performance recycled aluminum alloy materials, promoting the sustainable development of the automotive industry. Summary of the invention

[0005] The purpose of the present invention is to provide an efficient and environmentally friendly method for the regeneration and preparation of aluminum alloy automobile parts. By adopting a process route of pretreatment, smelting, melt purification, composition adjustment, and low-temperature casting, the efficient recovery and reuse of waste aluminum alloy automobile parts is achieved, while the high performance and environmental protection of the recycled aluminum alloy are guaranteed, solving the problems of low performance and quality of the existing recycled aluminum alloy.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is a highly efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts. The preparation method comprises the following steps:

[0008] (1) Step 1: Use scrap aluminum alloy automobile parts as raw materials, test their chemical composition, and classify, clean, crush and remove non-scrap aluminum alloy impurities; before adding to the furnace, pickle the surface of the recycled scrap aluminum to remove the surface oxide layer;

[0009] (2) Step 2: Place the waste aluminum alloy treated in step (1) in a coreless medium frequency induction furnace to melt into aluminum liquid, then introduce argon gas for degassing, ultrasonically stir and keep warm for a period of time;

[0010] (3) Step 3: Add refining agent and refiner to the aluminum liquid treated in step (2), stir with ultrasonic wave and keep warm for a period of time, then remove slag from the surface of the aluminum liquid and filter;

[0011] (4) Step 4: Add the intermediate alloy to the aluminum liquid treated in step (3) to adjust the composition, blow argon gas, and stir the aluminum liquid ultrasonically to make the alloy composition uniform. Let it stand for a period of time, then use a photoelectric direct reading spectrometer to detect the composition of the aluminum liquid, and add the intermediate alloy in real time until the mass percentage of each element in the aluminum liquid reaches the target aluminum alloy composition;

[0012] (5) Step 5: Pour the aluminum liquid treated in step (4) into a mold and obtain a recycled aluminum alloy by low-temperature casting.

[0013] As a preferred technical solution, the raw material in step (1) is waste aluminum alloy automobile parts.

[0014] As a preferred technical solution, the pickling in step (1) uses a mixed solution of 45% phosphoric acid (6 mol / L), 3% nitric acid (8 mol / L), and 52% acetic acid (8 mol / L) to remove the oxide layer.

[0015] As a preferred technical solution, the smelting temperature in step (2) is 710°C to 760°C.

[0016] As a preferred technical solution, the refining agent in step (3) is nitrogen, the refiner is Al-Ti-BC master alloy, the ultrasonic stirring frequency is 30-50 kHz, and the heat preservation is 20-40 minutes.

[0017] As a preferred technical solution, the intermediate alloys in step (4) are Al-20Si, Al-30Cu, Al-20Mg, and Al-20Mn, respectively, and the frequency of the stirring ultrasonic wave is 30 to 50 kHz.

[0018] As a preferred technical solution, in the low temperature casting process of step (5), the casting temperature should be controlled at 630°C to 730°C, and the preheating temperature of the mold should be 180°C to 240°C.

[0019] As a preferred technical solution, the tensile strength of the recycled aluminum alloy is ≥250MPa, the hydrogen content is ≤0.12mL / 100gAl, the elongation at break is ≥15%, and the corrosion current density is ≤1.2μA / cm 2

[0020] The present invention has the following beneficial effects:

[0021] a. The present invention realizes the effective utilization of resources by recycling waste aluminum alloy automobile parts, reduces the production demand of primary aluminum, thereby reducing energy consumption and environmental pollution, and meets the requirements of green manufacturing and sustainable development.

[0022] b. The present invention selects appropriate intermediate alloys according to the composition requirements of the target alloy and mixes them with the aluminum alloy raw materials. Through precise calculation and control, it ensures that the alloy composition meets the requirements, significantly improves the comprehensive performance of the recycled aluminum alloy, and provides a reliable raw material basis for manufacturing high-performance aluminum alloy products.

[0023] c. The present invention can reduce the porosity of the melt, increase the solid solubility of elements, reduce the degree of segregation of elements at grain boundaries, and improve the uniformity of the alloy through ultrasonic stirring.

[0024] d. The present invention can reduce the cooling rate of the casting through low-temperature casting, reduce defects such as shrinkage cavities and shrinkage in the casting, and improve the quality and performance of the casting.

[0025] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 The present invention is a flow chart of a highly efficient and environmentally friendly aluminum alloy automobile parts recycling preparation method. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1 It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] Embodiment 1

[0032] An efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts comprises the following steps:

[0033] (1) Step 1: Use scrap aluminum alloy automobile parts as raw materials, test their chemical composition, and classify, clean, crush and remove non-scrap aluminum alloy impurities; before adding to the melting furnace, use a mixed solution of 45% phosphoric acid (6 mol / L), 3% nitric acid (8 mol / L), and 52% acetic acid (8 mol / L) to remove the oxide layer of the recycled scrap aluminum alloy, and the pickling time is 5 min;

[0034] (2) Step 2: Place the waste aluminum alloy treated in step (1) in a coreless medium frequency induction furnace to melt into aluminum liquid at a melting temperature of 710° C. to 760° C., then introduce argon gas for degassing, stir at an ultrasonic frequency of 30 kHz, and keep warm for 20 minutes;

[0035] (3) Step 3: Add a refining agent, which is nitrogen, at a rate of 2 ml / min to the aluminum liquid treated in step (2), and then add a refiner, which is Al-Ti-BC master alloy. Stir at an ultrasonic frequency of 30 kHz, keep warm for 20 minutes, skim the slag from the surface of the aluminum liquid, and filter.

[0036] (4) Step 4: The aluminum liquid treated in step (3) is subjected to a photoelectric direct reading spectrometer to detect the composition of the aluminum liquid, and then appropriate amounts of intermediate alloys such as Al-20Si, Al-30Cu, Al-20Mg, and Al-20Mn are added to adjust the composition, argon gas is blown in, and ultrasonic stirring is performed to make the alloy composition uniform. The ultrasonic frequency is 30 kHz, and the mixture is allowed to stand for a period of time. The composition of the aluminum liquid is then detected by a photoelectric direct reading spectrometer, and intermediate alloys are added in real time until the mass percentage of each element in the aluminum liquid reaches the target aluminum alloy composition;

[0037] (5) Step 5: Pour the aluminum liquid treated in step (4) into a mold. The casting temperature should be controlled at 680°C. The preheating temperature of the mold is 180°C to 240°C. The recycled aluminum alloy is obtained by low-temperature casting.

[0038] The recycled aluminum alloy prepared in this embodiment has fine grains, uniform composition, high purity, tensile strength of 300 MPa, hydrogen content of 0.1 mL / 100 gAl, elongation at break of 20%, and corrosion current density of 0.9 μA / cm 2 , achieving the effective recycling and reuse of waste aluminum alloy automobile parts, reducing environmental pollution and waste of resources.

[0039] Embodiment 2

[0040] An efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts comprises the following steps:

[0041] (1) Step 1: Use scrap aluminum alloy automobile parts as raw materials, test their chemical composition, and classify, clean, crush and remove non-scrap aluminum alloy impurities; before adding to the melting furnace, use a mixed solution of 45% phosphoric acid (6 mol / L), 3% nitric acid (8 mol / L), and 52% acetic acid (8 mol / L) to remove the oxide layer of the recycled scrap aluminum alloy, and the pickling time is 8 minutes;

[0042] (2) Step 2: Place the waste aluminum alloy treated in step (1) in a coreless medium frequency induction furnace to melt into aluminum liquid at a melting temperature of 710° C. to 760° C., then introduce argon gas for degassing, stir at an ultrasonic frequency of 40 kHz, and keep warm for 30 minutes;

[0043] (3) Step 3: Add a refining agent, which is nitrogen, at a rate of 4 ml / min to the aluminum liquid treated in step (2), and then add a refiner, which is Al-Ti-BC master alloy. Stir at an ultrasonic frequency of 40 kHz, keep warm for 30 minutes, skim the slag from the surface of the aluminum liquid, and filter.

[0044] (4) Step 4: The aluminum liquid treated in step (3) is subjected to a photoelectric direct reading spectrometer to detect the composition of the aluminum liquid, and then appropriate amounts of intermediate alloys such as Al-20Si, Al-30Cu, Al-20Mg, and Al-20Mn are added to adjust the composition, argon is blown in, and ultrasonic stirring is performed to make the alloy composition uniform. The ultrasonic frequency is 40 kHz, and the mixture is allowed to stand for a period of time. The composition of the aluminum liquid is then detected by a photoelectric direct reading spectrometer, and intermediate alloys are added in real time until the mass percentage of each element in the aluminum liquid reaches the target aluminum alloy composition;

[0045] (5) Step 5: Pour the aluminum liquid treated in step (4) into a mold. The casting temperature should be controlled at 680°C. The preheating temperature of the mold is 180°C to 240°C. The recycled aluminum alloy is obtained by low-temperature casting.

[0046] The recycled aluminum alloy prepared in this embodiment has fine grains, uniform composition, high purity, tensile strength of 320 MPa, hydrogen content of 0.07 mL / 100 gAl, elongation at break of 22%, and corrosion current density of 0.65 μA / cm 2 , achieving the effective recycling and reuse of scrap aluminum alloy auto parts, reducing environmental pollution and resource waste.

[0047] Embodiment 3

[0048] An efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts comprises the following steps:

[0049] (1) Step 1: Use scrap aluminum alloy automobile parts as raw materials, test their chemical composition, and classify, clean, crush and remove non-scrap aluminum alloy impurities; before adding to the melting furnace, use a mixed solution of 45% phosphoric acid (6 mol / L), 3% nitric acid (8 mol / L), and 52% acetic acid (8 mol / L) to remove the oxide layer of the recycled scrap aluminum alloy, and the pickling time is 10 min;

[0050] (2) Step 2: Place the waste aluminum alloy treated in step (1) in a coreless medium frequency induction furnace to melt into aluminum liquid at a melting temperature of 710° C. to 760° C., then introduce argon gas for degassing, stir at an ultrasonic frequency of 50 kHz, and keep warm for 40 minutes;

[0051] (3) Step 3: Add a refining agent, which is nitrogen, at a rate of 6 ml / min to the aluminum liquid treated in step (2), and then add a refiner, which is Al-Ti-BC master alloy. Stir at an ultrasonic frequency of 50 kHz, keep warm for 30 minutes, skim the slag from the surface of the aluminum liquid, and filter.

[0052] (4) Step 4: The aluminum liquid treated in step (3) is subjected to a photoelectric direct reading spectrometer to detect the composition of the aluminum liquid, and then appropriate amounts of intermediate alloys such as Al-20Si, Al-30Cu, Al-20Mg, and Al-20Mn are added to adjust the composition, argon gas is blown in, and ultrasonic stirring is performed to make the alloy composition uniform. The ultrasonic frequency is 50 kHz, and the mixture is allowed to stand for a period of time. The composition of the aluminum liquid is then detected by a photoelectric direct reading spectrometer, and intermediate alloys are added in real time until the mass percentage of each element in the aluminum liquid reaches the target aluminum alloy composition;

[0053] (5) Step 5: Pour the aluminum liquid treated in step (4) into a mold. The casting temperature should be controlled at 680°C. The preheating temperature of the mold is 180°C to 240°C. The recycled aluminum alloy is obtained by low-temperature casting.

[0054] The recycled aluminum alloy prepared in this embodiment has fine grains, uniform composition, high purity, tensile strength of 310 MPa, hydrogen content of 0.09 mL / 100 gAl, elongation at break of 21%, and corrosion current density of 0.85 μA / cm 2 , achieving the effective recycling and reuse of waste aluminum alloy automobile parts, reducing environmental pollution and waste of resources.

[0055] Embodiment 4

[0056] An efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts comprises the following steps:

[0057] (1) Step 1: Same as in Example 2;

[0058] (2) Step 2: Same as in Example 2;

[0059] (3) Step 3: Same as in Example 2;

[0060] (4) Step 4: Same as in Example 2;

[0061] (5) Step 5: Pour the aluminum liquid treated in step (4) into a mold. The casting temperature should be controlled at 630°C. The preheating temperature of the mold is 180°C to 240°C. The recycled aluminum alloy is obtained by low-temperature casting.

[0062] The recycled aluminum alloy prepared in this embodiment has fine grains, uniform composition, high purity, tensile strength of 315MPa, hydrogen content of 0.08mL / 100gAl, elongation at break of 18%, and corrosion current density of 0.75μA / cm 2 , achieving the effective recycling and reuse of waste aluminum alloy automobile parts, reducing environmental pollution and waste of resources.

[0063] Embodiment 5

[0064] An efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts comprises the following steps:

[0065] (1) Step 1: Same as in Example 2;

[0066] (2) Step 2: Same as in Example 2;

[0067] (3) Step 3: Same as in Example 2;

[0068] (4) Step 4: Same as in Example 2;

[0069] (5) Step 5: Pour the aluminum liquid treated in step (4) into a mold. The casting temperature should be controlled at 730°C. The preheating temperature of the mold is 180°C to 240°C. The recycled aluminum alloy is obtained by low-temperature casting.

[0070] The recycled aluminum alloy prepared in this embodiment has fine grains, uniform composition, high purity, tensile strength of 297 MPa, hydrogen content of 0.12 mL / 100 gAl, elongation at break of 19%, and corrosion current density of 1.0 μA / cm 2 , achieving the effective recycling and reuse of waste aluminum alloy automobile parts, reducing environmental pollution and waste of resources.

[0071] Comparative Example 1

[0072] (1) Step 1: Use scrap aluminum alloy automobile parts as raw materials, test their chemical composition, and classify, clean, crush and remove non-scrap aluminum alloy impurities; before adding to the melting furnace, use a mixed solution of 45% phosphoric acid (6 mol / L), 3% nitric acid (8 mol / L), and 52% acetic acid (8 mol / L) to remove the oxide layer of the recycled scrap aluminum alloy, and the pickling time is 8 minutes;

[0073] (2) Step 2: Place the waste aluminum alloy treated in step (1) in a coreless medium frequency induction furnace to melt into aluminum liquid at a melting temperature of 710° C. to 760° C., then introduce argon gas for degassing and keep warm for 30 minutes;

[0074] (3) Step 3: Add a refining agent, which is nitrogen, at a rate of 4 ml / min, to the aluminum liquid treated in step (2), and then add a refiner, which is an Al-Ti-BC master alloy. Stir and keep warm for 30 minutes, scrape the surface of the aluminum liquid, and filter.

[0075] (4) Step 4: The aluminum liquid treated in step (3) is subjected to a photoelectric direct reading spectrometer to detect the composition of the aluminum liquid, and then appropriate amounts of intermediate alloys such as Al-20Si, Al-30Cu, Al-20Mg, and Al-20Mn are added to adjust the composition, argon gas is blown into the aluminum liquid, and the aluminum liquid is allowed to stand for a period of time. The composition of the aluminum liquid is then detected by a photoelectric direct reading spectrometer, and intermediate alloys are added in real time until the mass percentage of each element in the aluminum liquid reaches the target aluminum alloy composition;

[0076] (5) Step 5: Pour the aluminum liquid treated in step (4) into a mold. The casting temperature should be controlled at 680°C. The preheating temperature of the mold is 180°C to 240°C. The recycled aluminum alloy is obtained by low-temperature casting.

[0077] The recycled aluminum alloy prepared in this embodiment has fine grains, uniform composition, high purity, tensile strength of 240 MPa, hydrogen content of 0.2 mL / 100 gAl, elongation at break of 20%, and corrosion current density of 1.5 μA / cm 2 , achieving the effective recycling and reuse of waste aluminum alloy automobile parts, reducing environmental pollution and waste of resources.

[0078] Comparative Example 2

[0079] (1) Step 1: Use scrap aluminum alloy automobile parts as raw materials, test their chemical composition, and classify, clean, crush and remove non-scrap aluminum alloy impurities; before adding to the melting furnace, use a mixed solution of 45% phosphoric acid (6 mol / L), 3% nitric acid (8 mol / L), and 52% acetic acid (8 mol / L) to remove the oxide layer of the recycled scrap aluminum alloy, and the pickling time is 8 minutes;

[0080] (2) Step 2: Place the waste aluminum alloy treated in step (1) in a coreless medium frequency induction furnace to melt into aluminum liquid at a melting temperature of 710° C. to 760° C., then introduce argon gas for degassing, stir at an ultrasonic frequency of 40 kHz, and keep warm for 30 minutes;

[0081] (3) Step 3: Add a refining agent, which is nitrogen, at a rate of 4 ml / min to the aluminum liquid treated in step (2), and then add a refiner, which is Al-Ti-BC master alloy. Stir at an ultrasonic frequency of 40 kHz, keep warm for 30 minutes, skim the slag from the surface of the aluminum liquid, and filter.

[0082] (4) Step 4: The aluminum liquid treated in step (3) is subjected to a photoelectric direct reading spectrometer to detect the composition of the aluminum liquid, and then appropriate amounts of intermediate alloys such as Al-20Si, Al-30Cu, Al-20Mg, and Al-20Mn are added to adjust the composition, argon is blown in, and ultrasonic stirring is performed to make the alloy composition uniform. The ultrasonic frequency is 40 kHz, and the mixture is allowed to stand for a period of time. The composition of the aluminum liquid is then detected by a photoelectric direct reading spectrometer, and intermediate alloys are added in real time until the mass percentage of each element in the aluminum liquid reaches the target aluminum alloy composition;

[0083] (5) Step 5: Pour the aluminum liquid treated in step (4) into a mold to obtain a recycled aluminum alloy, and the preheating temperature of the mold is 180°C to 240°C.

[0084] The recycled aluminum alloy prepared in this embodiment has fine grains, uniform composition, high purity, tensile strength of 250MPa, hydrogen content of 0.15mL / 100gAl, elongation at break of 21%, and corrosion current density of 1.3μA / cm 2 , achieving the effective recycling and reuse of waste aluminum alloy automobile parts, reducing environmental pollution and waste of resources.

[0085] It is worth noting that in the above system embodiment, the various units included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0086] In addition, those skilled in the art can understand that all or part of the steps in the above-mentioned embodiments can be completed by instructing related hardware through a program, and the corresponding program can be stored in a computer-readable storage medium.

[0087] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A highly efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts, characterized in that: The steps include: (1) Step 1: Use scrap aluminum alloy automobile parts as raw materials, test their chemical composition, and classify, clean, crush and remove non-scrap aluminum alloy impurities; before adding to the furnace, pickle the surface of the recycled scrap aluminum to remove the surface oxide layer; (2) Step 2: placing the waste aluminum alloy treated in step (1) in a coreless medium frequency induction furnace to melt into aluminum liquid, then introducing argon gas for degassing, ultrasonically stirring and keeping warm for a period of time; (3) Step 3: Add refining agent and refiner to the aluminum liquid treated in step (2), stir with ultrasonic wave and keep warm for a period of time, then remove slag from the surface of the aluminum liquid and filter; (4) Step 4: Add the intermediate alloy to the aluminum liquid treated in step (3) to adjust the composition, blow argon gas, and stir the aluminum liquid ultrasonically to make the alloy composition uniform. Let it stand for a period of time, then use a photoelectric direct reading spectrometer to detect the composition of the aluminum liquid, and add the intermediate alloy in real time until the mass percentage of each element in the aluminum liquid reaches the target aluminum alloy composition; (5) Step 5: Pour the aluminum liquid treated in step (4) into a mold and obtain a recycled aluminum alloy by low-temperature casting.

2. The highly efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts according to claim 1, characterized in that: The raw materials in step (1) are waste aluminum alloy automobile parts.

3. The highly efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts according to claim 1, characterized in that: The pickling described in step (1) uses a mixed solution of 45% phosphoric acid (6 mol / L), 3% nitric acid (8 mol / L), and 52% acetic acid (8 mol / L) to remove the oxide layer.

4. The highly efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts according to claim 1, characterized in that: The smelting temperature in step (2) is 710°C to 760°C.

5. The highly efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts according to claim 1, characterized in that: In the step (3), the refining agent is nitrogen, the refiner is Al-Ti-BC master alloy, the stirring ultrasonic frequency is 30-50kHz, and the temperature is kept at 20-40min.

6. The highly efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts according to claim 1, characterized in that: The intermediate alloys in step (4) are Al-20Si, Al-30Cu, Al-20Mg, and Al-20Mn, respectively, and the frequency of the stirring ultrasonic wave is 30 to 50 kHz.

7. The highly efficient and environmentally friendly method for regenerating and preparing aluminum alloy automobile parts according to claim 1, characterized in that: In the step (5), the low temperature casting forming should have a casting temperature controlled at 630°C to 730°C, and a preheating temperature of the mold at 180°C to 240°C.

8. A recycled aluminum alloy prepared according to the method according to any one of claims 1 to 7, characterized in that: The tensile strength of the recycled aluminum alloy is ≥250MPa, the hydrogen content is ≤0.12mL / 100gAl, the elongation at break is ≥15%, and the corrosion current density is ≤1.2μA / cm 2 .

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