Green low-carbon regenerated aluminum ingot and preparation method thereof

Abstract

The invention discloses a preparation method of a green low-carbon regenerated aluminum ingot, which comprises the following steps: S1, putting an A00 aluminum ingot and an aluminum cake into a heating furnace according to a ratio, heating, and uniformly stirring and melting; s2, adding a deslagging agent to remove ash on the surface of the molten aluminum; s3, iron impurities are removed through an iron attracting machine; s4, an electric aluminum wire is put in, heated and stirred; s5, sampling, detecting and supplementing white materials and aluminum scraps; s6, elements such as Mg, Ti and Si are supplemented according to the detection result; s7, heating and refining by using high-purity nitrogen; and S8, after standing, casting into an ingot mold, and cooling to room temperature after heat preservation. According to the preparation method, the strength, toughness and corrosion resistance of the alloy are remarkably improved through accurate component control and optimized technological processes, efficient recycling of the aluminum scraps is achieved, the production cost is reduced, the high-performance requirement of the high-end manufacturing fields such as automobiles and aerospace can be met, and meanwhile the concept of green production is met.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloys, and in particular to a green low-carbon recycled aluminum ingot and a preparation method thereof. Background Art

[0002] In the production process of aluminum alloy, A356 aluminum alloy is widely used due to its excellent casting performance and mechanical properties, especially in high-end manufacturing fields such as automobiles and aerospace. However, with the development of industry, a large amount of aluminum chips are produced in the production process of A356 aluminum alloy, which contains rich aluminum resources. If directly discarded, it will not only cause resource waste, but also increase production costs and environmental burden. Traditional aluminum chips recycling methods mainly focus on simple recycling and remelting, but this method has many problems. First, the composition of aluminum chips is complex and contains impurities in different proportions, such as iron, copper, zinc, etc., which will affect the performance of the recycled alloy. Secondly, aluminum chips are easily oxidized during processing to form aluminum oxide that is difficult to melt, which increases the amount of slag in the smelting process and reduces the recovery rate of aluminum. In addition, the traditional recycling process is not precise enough in controlling the composition, making it difficult to ensure the performance stability of the recycled alloy, limiting its use in high-end application fields. Therefore, developing an efficient, green and environmentally friendly A356 aluminum chips recycling and smelting method that can be stably produced is of great significance for improving resource utilization, reducing production costs and reducing environmental pollution. In addition to aluminum chips, raw materials such as A00 aluminum ingots, aluminum cakes and electric aluminum wires are also commonly used in production. The feed ratio and smelting temperature of these raw materials need to be precisely controlled during the smelting process to ensure the uniformity and stability of the alloy composition. Summary of the invention

[0003] In view of the above shortcomings of the prior art, the present invention provides a method for preparing a green and low-carbon recycled aluminum ingot to solve the technical problems of insufficient mechanical properties, unstable casting performance, incomplete impurity removal and low efficiency of recycled resource utilization of A356 aluminum alloy in the application of thin-walled special-shaped castings in the prior art.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A method for preparing a green low-carbon recycled aluminum ingot, the method comprising the following steps:

[0006] S1 Feeding operation: put A00 aluminum ingots and aluminum cakes into the hot furnace one by one according to the proportion, heat up for 2 to 2.5 hours, control the aluminum liquid temperature at 670 to 680°C, and stir to melt evenly;

[0007] S2 slag removal operation: put the ash hopper into the hot furnace, add a proper amount of slag removal agent, stir to make the slag float, and then slowly remove the slag on the surface of the aluminum liquid;

[0008] S3 Iron absorption operation: Connect the power supply as required, put the iron absorption machine into the hot furnace for preheating, rotate it back and forth at a position 8 to 12 cm away from the bottom of the furnace to absorb the iron, and control the aluminum liquid temperature at 670 to 680 ° C. The single iron absorption time shall not exceed 2 minutes;

[0009] S4 feeding operation: add a certain proportion of electric aluminum wire, heat up for 2 to 2.5 hours, control the aluminum liquid temperature at 690 to 700°C, and stir to melt evenly;

[0010] S5: After repeated stirring, take samples, perform spectrum detection and composition analysis, select white material and aluminum chips for replenishment according to the test results, heat up for 2 to 2.5 hours, control the aluminum liquid temperature at 700 to 730°C, and stir to melt evenly;

[0011] S6 Secondary component adjustment operation: After repeated stirring, take samples, perform spectral detection and analysis of components, and select at least one of Mg, Ti, and Si elements for addition according to the detection results;

[0012] S7 refining operation: heating to 720℃±5℃, refining operation, after refining, remove the ash on the surface of aluminum liquid several times;

[0013] S8 Standing and ingot casting operation: After standing for 15 to 20 minutes, the aluminum liquid is cast into the preheated ingot casting mold, the aluminum liquid temperature is controlled at 700 to 710°C, and after keeping warm for 2 to 4 hours, it is cooled to room temperature, and the A356 aluminum alloy is obtained after passing the inspection.

[0014] The A356 aluminum alloy preparation method for thin-walled special-shaped castings of the present invention achieves a significant improvement in alloy performance through a series of optimized process steps. First, by accurately controlling the feed ratio and smelting temperature, the uniform melting and composition stability of the aluminum liquid are ensured; secondly, a specific slag remover and iron absorption operation are used to effectively remove impurities and iron elements in the aluminum liquid, thereby improving the purity of the alloy; further, through multiple composition adjustments and spectral detection, the proportion of each element in the alloy is accurately controlled, and the mechanical properties of the alloy are optimized; in addition, the refining operation and subsequent standing, rapid cooling and aging treatment refine the grain structure, enhance the strength and toughness of the alloy, and maintain good casting performance. The comprehensive application of these technical means not only improves the comprehensive performance of the alloy, enabling it to meet the demand for high-performance aluminum alloys in high-end manufacturing fields such as automobiles and aerospace, but also conforms to the concept of green production, achieving efficient utilization of resources and cost reduction.

[0015] As a preferred technical solution, during the slag removal operation in step S2, the slag remover is composed of a reducing agent and a fluoride and / or chloride. The slag remover of the present application is composed of a reducing agent (such as silicon carbide, boride, etc.) and a fluoride / chloride, which can more effectively remove aluminum oxide (Al2O3) and other impurities in aluminum liquid. The reducing agent can reduce aluminum oxide and turn it back into metallic aluminum, thereby increasing the recovery rate of aluminum; fluorides and chlorides can lower the melting point of the slag, making it easier to float and be removed, reducing slag inclusion defects and improving product quality.

[0016] As a preferred technical solution, a small amount of titanium or zirconium is added during the iron-absorbing operation in step S3. The present application adds a small amount of titanium or zirconium in the iron-absorbing process to promote the aggregation and removal of iron impurities. Titanium or zirconium forms high-melting-point compounds with iron, which are not easily soluble in aluminum liquid and are more easily removed by the iron-absorbing machine. In addition, the addition of titanium or zirconium can also improve the fluidity of aluminum liquid, reduce the negative impact of iron impurities on alloy properties, and improve the corrosion resistance and mechanical properties of the alloy.

[0017] As a preferred technical solution, after the iron absorption operation process in step S3, microalloying treatment is also performed: during the smelting process, a trace amount of boron or strontium is added to the aluminum liquid in the form of an intermediate alloy, stirred evenly, and then heat-insulated to ensure that the trace elements are fully diffused. The microalloying treatment of the present application can improve the fluidity of the alloy, reduce the tendency of hot cracking, and thus improve the microstructure and properties of the aluminum alloy by adding a trace amount of boron or strontium.

[0018] As a preferred technical solution, during the refining operation in step S7, nitrogen with a purity of 99.999% is used, and the refining is performed twice, each time for no less than 30 minutes.

[0019] As a preferred technical solution, a grain refinement operation is also performed after the refining operation in step S7: the aluminum liquid is treated with an ultrasonic device or an electromagnetic stirring device to ensure the uniform distribution of the alloy components. The present application uses an ultrasonic device or an electromagnetic stirring device to treat the aluminum liquid, which can effectively refine the grains and improve the strength and toughness of the alloy. Ultrasonic treatment can break the growth of grains through the acoustic cavitation effect and promote the uniform refinement of grains; electromagnetic stirring can make the aluminum liquid flow more uniformly through the action of the magnetic field, further ensuring the uniform distribution of the alloy components.

[0020] As a preferred technical solution, in step S8, during the standing and ingot casting operation: quickly cool to room temperature after heat preservation, control the cooling rate at 10-20°C / s, then keep at 150-200°C aging temperature for 6-12 hours, and naturally cool to obtain the A356 aluminum alloy. The rapid cooling (such as water spray cooling or spray cooling) of the present application can refine the grain structure of the alloy and improve the strength and toughness of the alloy. The subsequent aging treatment can further optimize the microstructure of the alloy, make the strengthening phase in the alloy precipitate uniformly, significantly improve the strength and hardness of the alloy, and maintain good toughness.

[0021] As a preferred technical solution, during the feeding operation of step S1, the feeding mass ratio of the A00 aluminum ingot and the aluminum cake is 5:15 to 25. Through the refining operation, the present application can significantly improve the purity of the aluminum liquid, remove gas and impurities, reduce the pores and inclusions in the casting, thereby enhancing the density, strength, toughness and corrosion resistance of the alloy, and meeting the demand for high-performance aluminum alloys in the high-end manufacturing field.

[0022] As a preferred technical solution, during the feeding operation of step S4, the ratio of the feeding amount of the electric aluminum wire to the feeding amount of the aluminum cake is 1 to 10:50.

[0023] Another aspect of the present invention is to provide a green low-carbon recycled aluminum ingot, which is prepared by the green low-carbon recycled aluminum ingot preparation method as mentioned above, and meets the performance requirements of A356 aluminum alloy. The chemical composition of the A356 aluminum alloy is as follows by weight percentage: Si is 6.5-7.5%, Fe≤0.2%, Cu≤0.01%, Mn≤0.05%, Mg is 0.1-0.4%, Cr≤0.05%, Ni≤0.05%, Zn≤0.05%, Ti is 0.1-0.25%, Pb≤0.005%, Sn≤0.1%, other elements≤0.05%, and the balance is Al.

[0024] Beneficial effects of the present invention:

[0025] The green low-carbon recycled aluminum ingot preparation method of the present invention not only realizes the efficient utilization of recycled aluminum scraps and reduces production costs, but also realizes significant improvement of alloy performance by innovatively introducing multiple improvement measures in the efficient utilization of various raw materials (including white materials, aluminum scraps, A00 aluminum ingots, aluminum cakes and electric aluminum wires), precise composition control and optimized heat treatment process. This design not only enhances the strength and toughness of the alloy, but also maintains good casting performance and corrosion resistance, which helps to improve the long-term stability and service life of the product. At the same time, it conforms to the concept of green production, reduces the dependence on primary aluminum, and has significant economic and environmental benefits.

[0025] In general, the green and low-carbon recycled aluminum ingot of the present invention not only has excellent mechanical properties (such as high strength and high toughness), but also has good processing performance and corrosion resistance, and can meet the strict requirements of high-end manufacturing fields such as automobiles, aerospace, etc. for high-performance aluminum alloy materials. DETAILED DESCRIPTION

[0026] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0027] Example 1

[0028] The green low-carbon recycled aluminum ingot preparation method of this embodiment comprises the following steps:

[0029] S1 Feeding operation: A00 aluminum ingots and aluminum cakes are put into the hot furnace one by one according to the proportion, and the temperature is raised for 2 hours. The aluminum liquid temperature is controlled at 670℃, and the aluminum liquid is stirred and melted evenly; the feeding mass ratio of the A00 aluminum ingot and aluminum cake is 5:20. After the feeding is completed, the aluminum liquid is repeatedly stirred evenly, and samples are taken for spectrum detection and analysis of the composition to control the Fe content.

[0030] S2 slag removal operation: put the ash hopper into the hot furnace, add a proper amount of slag removal agent, stir to make the slag float, and then slowly scrape out the slag on the surface of the aluminum liquid; the slag removal agent is composed of reducing agent silicon carbide and magnesium fluoride in a mass ratio of 1:5.

[0031] S3 iron absorption operation: connect the power supply as required, put the iron absorption machine into the hot furnace for preheating, rotate it back and forth at a position 10 cm away from the bottom of the furnace to absorb the iron, and control the temperature of the aluminum liquid at 670°C. The single iron absorption time does not exceed 2 minutes. During the iron absorption operation, a small amount of titanium agent element is added at the same time. After the iron absorption operation, micro-alloying treatment is also carried out, that is, in the above-mentioned smelting process, a trace amount of strontium aluminum alloy is added to the aluminum liquid in the form of an intermediate alloy, stirred evenly, and then kept warm for 2 hours to ensure that the trace elements are fully diffused.

[0032] S4 feeding operation: add a certain proportion of electric aluminum wire, heat up for 2.5 hours, control the temperature of aluminum liquid at 690°C, stir and melt evenly; the ratio of the amount of electric aluminum wire to the amount of aluminum cake is 3:50.

[0033] S5: After repeated stirring, take samples and analyze the components by spectral detection. According to the test results, select white material and aluminum chips for replenishment. Heat up for 2 hours, control the aluminum liquid temperature at 700℃, and stir to melt evenly.

[0034] S6 Secondary component adjustment operation: After repeated stirring, take samples, perform spectral detection and component analysis, and select at least one of the Mg, Ti, and Si elements for supplementation based on the detection results.

[0035] S7 refining operation: heating to 720℃, refining operation, using nitrogen with purity of 99.999%, refining twice, each time for no less than 30 minutes, after refining, remove the ash on the surface of the aluminum liquid several times; after refining, grain refinement operation is also carried out: ultrasonic equipment or electromagnetic stirring device is used to treat the aluminum liquid to ensure the uniform distribution of alloy components. Spectral detection and analysis are carried out again to determine the composition is qualified.

[0036] S8 Standing and Ingot Casting Operation: After standing for 15 minutes, cast the aluminum liquid into the preheated ingot casting mold, control the aluminum liquid temperature at 710°C, keep it warm for 4 hours and then cool it to room temperature, and obtain the regenerated aluminum ingot, i.e. A356 aluminum alloy (aluminum ingots with bubbles, unsightly, and unqualified are detected, aluminum bars weigh 6 to 6.5 kg, 16 layers, about 700 kg / stamp). In step S8 standing and ingot casting operation: quickly cool to room temperature after keeping warm, control the cooling rate at 10°C / s, then keep it warm at 200°C aging temperature for 6 hours, and naturally cool to obtain the A356 aluminum alloy. The chemical composition of the prepared A356 aluminum alloy is as follows by weight percentage: Si is 6.5%, Fe is 0.16%, Cu is 0.01%, Mn is 0.04%, Mg is 0.38%, Cr is 0.04%, Ni is 0.03%, Zn is 0.04%, Ti is 0.25%, Pb is 0.004%, Sn is 0.08%, other elements are 0.04%, and the balance is Al.

[0037] Example 2

[0038] The green low-carbon recycled aluminum ingot preparation method of this embodiment comprises the following steps:

[0039] S1 Feeding operation: A00 aluminum ingots and aluminum cakes are put into the hot furnace one by one according to the proportion, and the temperature is raised for 2.5 hours. The aluminum liquid temperature is controlled at 680℃, and the aluminum liquid is stirred and melted evenly; the mass ratio of the A00 aluminum ingot and aluminum cake is 5:15. After the feeding is completed, the aluminum liquid is repeatedly stirred evenly, and samples are taken for spectrum detection and analysis of the composition to control the Fe content.

[0040] S2 slag removal operation: put the ash hopper into the hot furnace, add a proper amount of slag removal agent, stir to make the slag float, and then slowly remove the slag on the surface of the aluminum liquid; the slag removal agent is composed of reducing agent silicon carbide and magnesium fluoride in a mass ratio of 1:4.

[0041] S3 iron absorption operation: connect the power supply as required, put the iron absorption machine into the hot furnace for preheating, rotate it back and forth at a position 10 cm away from the bottom of the furnace to absorb the iron, and control the temperature of the aluminum liquid at 680°C. The single iron absorption time does not exceed 2 minutes. During the iron absorption operation, a small amount of titanium agent element is added at the same time. After the iron absorption operation, micro-alloying treatment is also carried out, that is, in the above-mentioned smelting process, a trace amount of strontium aluminum alloy is added to the aluminum liquid in the form of an intermediate alloy, stirred evenly, and then kept warm for 2 hours to ensure that the trace elements are fully diffused.

[0042] S4 feeding operation: add a certain proportion of electric aluminum wire, heat up for 2.5 hours, control the temperature of aluminum liquid at 700°C, stir and melt evenly; the ratio of the amount of electric aluminum wire to the amount of aluminum cake is 5:50.

[0043] S5: After repeated stirring, take samples and analyze the components by spectral detection. According to the test results, select white material and aluminum chips for replenishment. Heat up for 2 hours, control the aluminum liquid temperature at 720℃, and stir to melt evenly.

[0044] S6 Secondary component adjustment operation: After repeated stirring, take a sample, perform spectral detection and component analysis, and select at least one of the Mg, Ti, and Si elements for supplementation based on the detection results.

[0045] S7 refining operation: heating to 720℃, refining operation, using nitrogen with purity of 99.999%, refining twice, each time for no less than 30 minutes, after refining, remove the ash on the surface of the aluminum liquid several times; after refining, grain refinement operation is also carried out: ultrasonic equipment or electromagnetic stirring device is used to treat the aluminum liquid to ensure the uniform distribution of alloy components. Spectral detection and analysis are carried out again to determine the composition is qualified.

[0046] S8 Standing and Ingot Casting Operation: After standing for 20 minutes, cast the aluminum liquid into the preheated ingot casting mold, control the aluminum liquid temperature at 710°C, keep warm for 3 hours and then cool to room temperature, and obtain the regenerated aluminum ingot, i.e. A356 aluminum alloy (aluminum ingots with bubbles, unsightly, and unqualified are detected, aluminum bar weight 6-6.5kg, 16 layers, about 700kg / stamp). In step S8 standing and ingot casting operation: quickly cool to room temperature after keeping warm, control the cooling rate at 15°C / s, then keep warm at 200°C aging temperature for 8 hours, and naturally cool to obtain the A356 aluminum alloy. The chemical composition of the prepared A356 aluminum alloy is as follows by weight percentage: Si is 7.2%, Fe is 0.13%, Cu is 0.008%, Mn is 0.04%, Mg is 0.15%, Cr is 0.03%, Ni is 0.03%, Zn is 0.03%, Ti is 0.21%, Pb is 0.005%, Sn is 0.07%, other elements are 0.03%, and the balance is Al.

[0047] Example 3

[0048] The green low-carbon recycled aluminum ingot preparation method of this embodiment comprises the following steps:

[0049] S1 Feeding operation: A00 aluminum ingots and aluminum cakes are put into the hot furnace one by one according to the proportion, and the temperature is raised for 2.5 hours. The aluminum liquid temperature is controlled at 680℃, and the aluminum liquid is stirred and melted evenly; the feeding mass ratio of the A00 aluminum ingot and aluminum cake is 5:25. After the feeding is completed, the aluminum liquid is repeatedly stirred evenly, and samples are taken for spectrum detection and analysis of the composition to control the Fe content.

[0050] S2 slag removal operation: put the ash hopper into the hot furnace, add a proper amount of slag removal agent, stir to make the slag float, and then slowly remove the slag on the surface of the aluminum liquid; the slag removal agent is composed of reducing agent silicon carbide and magnesium fluoride in a mass ratio of 1:3.

[0051] S3 iron absorption operation: connect the power supply as required, put the iron absorption machine into the hot furnace for preheating, rotate it back and forth at a position 10 cm away from the bottom of the furnace to absorb the iron, and control the temperature of the aluminum liquid at 680°C. The single iron absorption time does not exceed 2 minutes. During the iron absorption operation, a small amount of titanium agent element is added at the same time. After the iron absorption operation, micro-alloying treatment is also carried out, that is, in the above-mentioned smelting process, a trace amount of strontium aluminum alloy is added to the aluminum liquid in the form of an intermediate alloy, stirred evenly, and then kept warm for 2 hours to ensure that the trace elements are fully diffused.

[0052] S4 feeding operation: add a certain proportion of electric aluminum wire, heat up for 2.5 hours, control the temperature of the aluminum liquid at 700°C, and stir and melt it evenly; the ratio of the amount of electric aluminum wire to the amount of aluminum cake is 3:50.

[0053] S5: After repeated stirring, take samples and analyze the components by spectral detection. According to the test results, select white material and aluminum chips for replenishment. Heat up for 2.5 hours, control the aluminum liquid temperature at 730℃, and stir to melt evenly.

[0054] S6 Secondary component adjustment operation: After repeated stirring, take a sample, perform spectral detection and component analysis, and select at least one of the Mg, Ti, and Si elements for supplementation based on the detection results.

[0055] S7 refining operation: heating to 720℃, refining operation, using nitrogen with purity of 99.999%, refining twice, each time for no less than 30 minutes, after refining, remove the ash on the surface of the aluminum liquid several times; after refining, grain refinement operation is also carried out: ultrasonic equipment or electromagnetic stirring device is used to treat the aluminum liquid to ensure the uniform distribution of alloy components. Spectral detection and analysis are carried out again to determine the composition is qualified.

[0056] S8 Standing and Ingot Casting Operation: After standing for 20 minutes, cast the aluminum liquid into the preheated ingot casting mold, control the aluminum liquid temperature at 710°C, keep it warm for 4 hours and then cool it to room temperature, and obtain the regenerated aluminum ingot, i.e. A356 aluminum alloy (aluminum ingots with bubbles, unsightly, and unqualified are detected, aluminum bars weigh 6 to 6.5 kg, 16 layers, about 700 kg / stamp). In step S8 standing and ingot casting operation: quickly cool to room temperature after keeping warm, control the cooling rate at 20°C / s, then keep it warm at 200°C aging temperature for 12 hours, and naturally cool to obtain the A356 aluminum alloy. The chemical composition of the prepared A356 aluminum alloy is as follows by weight percentage: Si is 7.4%, Fe is 0.16%, Cu is 0.007%, Mn is 0.03%, Mg is 0.28%, Cr is 0.03%, Ni is 0.02%, Zn is 0.03%, Ti is 0.15%, Pb is 0.005%, Sn is 0.08%, other elements are 0.04%, and the balance is Al.

[0057] Comparative Example 1

[0058] The raw material composition and preparation steps of the green low-carbon recycled aluminum ingot preparation method of this comparative example are basically the same as those of Example 1, except that, in the preparation method of this comparative example, ultrasonic equipment is not used for grain refinement operation.

[0059] Comparative Example 2

[0060] The raw material composition and preparation steps of the green low-carbon recycled aluminum ingot preparation method of this comparative example are basically the same as those of Example 1, except that, in the preparation method of this comparative example, rapid cooling treatment and aging treatment are not performed.

[0061] The performance of the recycled aluminum ingots prepared in Examples 1 to 3 and Comparative Examples 1 to 2 was tested, and the performance results are shown in Table 1:

[0062] Among them, the tensile strength and elongation are tested according to GB / T 228.1; the corrosion resistance is tested according to GB / T 10125, and the fracture toughness (KIC) is tested according to HB5142-1996 standard. Table 1

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A method for preparing a green low-carbon recycled aluminum ingot, characterized in that: The preparation method comprises the following steps: S1 Feeding operation: put A00 aluminum ingots and aluminum cakes into the hot furnace one by one according to the proportion, heat up for 2 to 2.5 hours, control the aluminum liquid temperature at 670 to 680°C, and stir to melt evenly; S2 slag removal operation: put the ash hopper into the hot furnace, add a proper amount of slag removal agent, stir to make the slag float, and then slowly remove the slag on the surface of the aluminum liquid; S3 Iron absorption operation: Connect the power supply as required, put the iron absorption machine into the hot furnace for preheating, rotate it back and forth at a position 8 to 12 cm away from the bottom of the furnace to absorb the iron, and control the aluminum liquid temperature at 670 to 680 ° C. The single iron absorption time shall not exceed 2 minutes; S4 feeding operation: add a certain proportion of electric aluminum wire, heat up for 2 to 2.5 hours, control the aluminum liquid temperature at 690 to 700°C, and stir to melt evenly; S5: After repeated stirring, take samples, perform spectrum detection and composition analysis, select white material and aluminum chips for replenishment according to the test results, heat up for 2 to 2.5 hours, control the aluminum liquid temperature at 700 to 730°C, and stir to melt evenly; S6 Secondary component adjustment operation: After repeated stirring, take samples, perform spectral detection and analysis of components, and select at least one of Mg, Ti, and Si elements for addition according to the detection results; S7 refining operation: heating to 720℃±5℃, refining operation, after refining, remove the ash on the surface of aluminum liquid several times; S8 Standing and ingot casting operation: After standing for 15 to 20 minutes, the aluminum liquid is cast into the preheated ingot mold, and the aluminum liquid temperature is controlled at 700 to 710°C. After keeping warm for 2 to 4 hours, it is cooled to room temperature. After passing the inspection, the A356 aluminum alloy recycled aluminum ingot is obtained.

2. The method for preparing a green low-carbon recycled aluminum ingot according to claim 1, characterized in that: During the slagging operation in step S2, the slagging agent is composed of a reducing agent and fluoride and / or chloride.

3. The method for preparing a green low-carbon recycled aluminum ingot according to claim 1, characterized in that: During the iron absorption operation in step S3, a small amount of titanium or zirconium element is added simultaneously.

4. The method for preparing a green low-carbon recycled aluminum ingot according to claim 1, characterized in that: After the iron absorption operation process in step S3, micro-alloying treatment is also performed: during the smelting process, a trace amount of boron or strontium is added to the aluminum liquid in the form of an intermediate alloy, and after being stirred evenly, a heat preservation treatment is performed to ensure that the trace elements are fully diffused.

5. The method for preparing a green low-carbon recycled aluminum ingot according to claim 1, characterized in that: During the refining operation in step S7, nitrogen with a purity of 99.999% is used and the refining is performed twice, each time for no less than 30 minutes.

6. The method for preparing a green low-carbon recycled aluminum ingot according to claim 1, characterized in that: After the refining operation in step S7, a grain refinement operation is also performed: the aluminum liquid is treated using an ultrasonic device or an electromagnetic stirring device to ensure a uniform distribution of the alloy components.

7. The method for preparing a green low-carbon recycled aluminum ingot according to claim 1, characterized in that: In step S8, the standing and ingot casting operations are as follows: the alloy is rapidly cooled to room temperature after heat preservation, the cooling rate is controlled at 10-20°C / s, and then the alloy is kept at an aging temperature of 150-200°C for 6-12 hours, and naturally cooled to obtain the A356 aluminum alloy.

8. The method for preparing a green low-carbon recycled aluminum ingot according to claim 1, characterized in that: During the feeding operation of step S1, the feeding mass ratio of the A00 aluminum ingot and the aluminum cake is 5:15-25.

9. The method for preparing a green low-carbon recycled aluminum ingot according to claim 1, characterized in that: During the feeding operation in step S4, the ratio of the feeding amount of the electric aluminum wire to the feeding amount of the aluminum cake is 1 to 10:

50.

10. A green low-carbon recycled aluminum ingot, characterized in that: The recycled aluminum ingot is prepared by the green and low-carbon recycled aluminum ingot preparation method as described in any one of claims 1 to 9, and the chemical composition of the recycled aluminum ingot is as follows by weight percentage: Si is 6.5-7.5%, Fe≤0.2%, Cu≤0.01%, Mn≤0.05%, Mg is 0.1-0.4%, Cr≤0.05%, Ni≤0.05%, Zn≤0.05%, Ti is 0.1-0.25%, Pb≤0.005%, Sn≤0.1%, other elements≤0.05%, and the balance is Al.

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