A green and low-carbon recycled resource aluminum-silicon master alloy and its preparation method

Abstract

The present invention discloses a preparation method of a green and low-carbon recycled resource aluminum-silicon master alloy, which comprises the following steps: S1 putting A00 aluminum ingots, metallic silicon and A356 aluminum chips into a heating furnace and stirring to melt them into aluminum liquid; S2 putting in A356 aluminum chips again and covering the metallic silicon to perform silicon erosion operation; S3 adding a slag removing agent to make the ash slag float up and performing slag skimming operation; S4 putting a magnetic separator into the heating furnace for preheating and then performing magnetic separation operation; S5 supplementing metallic silicon and adding a titanium agent to fully melt; S6 raising the temperature for refining operation, and skimming the ash slag after refining; S7 supplementing magnesium ingots; S8 standing and then casting the aluminum liquid, and cooling to obtain the aluminum-silicon master alloy. The preparation method of the present invention not only realizes the efficient recycling and utilization of A356 aluminum chips, but also enables the aluminum-silicon master alloy to have excellent mechanical properties and good casting properties, can meet the high-performance requirements of high-end manufacturing fields such as automobiles and aerospace, and conforms to the concept of green production at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum-silicon master alloys, and particularly to a green and low-carbon recycled resource aluminum-silicon master alloy and a preparation method thereof. Background Art

[0002] In the production process of aluminum alloys, A356 aluminum alloy is widely used due to its excellent casting performance and mechanical properties. However, with the development of industry, a large amount of aluminum chips are generated during the production of A356 aluminum alloy. These aluminum chips contain rich aluminum resources. If directly discarded, it will not only cause waste of resources, but also increase production costs and environmental burdens. Therefore, how to efficiently utilize these aluminum chips has become an important issue in the field of aluminum alloy production.

[0003] Traditional methods for recycling aluminum chips mainly focus on simple recycling and remelting, but this method has many problems. First, the composition of aluminum chips is complex, containing different proportions of impurities such as iron, copper, zinc, etc. These impurities will affect the performance of the recycled alloy. Second, aluminum chips are easily oxidized during the processing to form alumina that is difficult to melt, increasing the slag amount during the smelting process and reducing the aluminum recovery rate. In addition, the traditional recycling process has inaccurate composition control and is difficult to ensure the performance stability of the recycled alloy, limiting its use in high-end application fields.

[0004] Currently, although there are some technologies for recycling aluminum chips on the market, most of these technologies focus on single impurity removal or composition adjustment and lack a systematic solution. Therefore, developing an efficient, green and environmentally friendly A356 aluminum chip recycling and smelting method that can stably produce is of great significance for improving resource utilization rate, reducing production costs and reducing environmental pollution. Summary of the Invention

[0005] In view of the above deficiencies of the prior art, the present invention provides a preparation method of a green and low-carbon recycled resource aluminum-silicon master alloy to solve the technical problems such as low utilization efficiency of A356 aluminum chips, inaccurate composition control, incomplete impurity removal and unstable alloy performance in the prior art.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A preparation method of a green and low-carbon recycled resource aluminum-silicon master alloy, the preparation method comprising the following steps:

[0008] S1 Feeding operation: Put A00 aluminum ingots, metallic silicon and pretreated A356 aluminum chips into a heating furnace one by one according to a ratio, raise the temperature for 2 - 3 hours, control the aluminum liquid temperature at 690 - 710 °C, and stir and melt evenly;

[0009] S2 Feedstock addition operation: Re-add a certain proportion of A356 aluminum chips, cover the metallurgical silicon, and perform silicon erosion operation. Heat up for 1.5 - 2.5 hours, control the aluminum liquid temperature at 690 - 710 °C, and stir and melt evenly.

[0010] S3 Skimming operation: Place the ash hopper into the hot furnace, add an appropriate amount of slag removal agent, stir to make the ash and slag float, and then slowly skim the ash and slag on the surface of the aluminum liquid.

[0011] S4 Iron absorption operation: Connect the power supply as required. After preheating the iron absorber in the hot furnace, rotate it back and forth at a position 8 - 12 cm from the furnace bottom to suck out the iron. Control the aluminum liquid temperature at 680 - 700 °C, and the single - time iron absorption time does not exceed 2 minutes.

[0012] S5 First - stage composition adjustment operation: After stirring evenly repeatedly, take samples for spectral detection and analysis of the composition. According to the detection results, supplement metallurgical silicon, heat up to 780 °C ± 5 °C, stir evenly, and fully melt the titanium agent element.

[0013] S6 Refining operation: Heat up to 720 °C ± 5 °C for refining operation. Use nitrogen with a purity of 99.999%, refine 2 times, with each time lasting not less than 30 minutes. After refining, skim the ash and slag on the surface of the aluminum liquid in multiple times.

[0014] S7 Second - stage composition adjustment operation: After stirring evenly repeatedly, take samples for spectral detection and analysis of the composition. According to the detection results, supplement magnesium ingots.

[0015] S8 Standing and ingot casting operation: After standing for 15 - 20 minutes, pour the aluminum liquid into the pre - heated ingot mold, control the aluminum liquid temperature at 700 - 710 °C, keep it warm for 2 - 4 hours, and then cool it to room temperature. After passing the inspection, the aluminum - silicon master alloy is obtained.

[0016] The preparation method of the green and low - carbon recycled resource aluminum - silicon master alloy of the present invention not only effectively reduces the impurity content, improves the utilization rate of recycled aluminum, reduces the production cost, and at the same time reduces the dependence on primary aluminum by pre - treating A356 aluminum chips, which conforms to the green and low - carbon production concept; but also accurately controls the alloy composition through multiple spectral detections and analysis and composition adjustments, ensures the stability and consistency of the alloy performance, and optimizes the mechanical properties and corrosion resistance of the alloy.

[0017] As a preferred technical solution, the pre - treatment operation of the A356 aluminum chips includes at least one of classification, cleaning, drying, and degreasing. Through pre - treatment operations such as classification, cleaning, drying, and degreasing in this application, impurities, oil stains, and moisture in the A356 aluminum chips can be effectively removed, reducing impurity pollution and oxidation problems during the melting process, improving the purity and recovery rate of the aluminum liquid, and thus enhancing the quality and performance of the final product.

[0018] As a preferred technical solution, during the slag skimming operation in step S3, the drossing agent is composed of a reducing agent and a fluoride and / or a chloride. The drossing agent 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 alumina (Al2O3) and other impurities in the molten aluminum. The reducing agent can reduce alumina to make it turn back into metallic aluminum, improving the recovery rate of aluminum; the fluoride and chloride can lower the melting point of the slag, making the slag easier to float up and be removed, reducing slag inclusion defects and improving the product quality.

[0019] As a preferred technical solution, after the iron suction operation in step S4, microalloying treatment is also carried out: during the melting process, trace rare earth elements (such as yttrium, cerium) are added to the molten aluminum in the form of master alloys, and after stirring evenly, heat preservation treatment is carried out to ensure that the trace elements are fully diffused. The microalloying treatment of the present application can refine the crystal grains by adding trace rare earth elements, reduce the acicular structure of the silicon phase, and further improve the toughness of the alloy.

[0020] As a preferred technical solution, modification treatment is also carried out before the refining operation in step S6: when the temperature of the molten aluminum reaches 710°C ± 5°C, an appropriate amount of modifier is added, and after stirring evenly, it is left standing for 10 - 15 minutes to make the modifier fully react. The modification treatment of the present application can change the morphology of the silicon phase from an acicular structure to a granular or fibrous structure by adding a modifier. This morphological transformation can significantly improve the strength and toughness of the alloy, reduce the stress concentration points of the silicon phase in the casting, and reduce the hot cracking tendency. In addition, the modification treatment can also improve the fluidity of the alloy, improve the surface quality and dimensional accuracy of the casting.

[0021] As a preferred technical solution, during the refining operation in step S6, nitrogen with a purity of 99.999% is used, and the refining is carried out 2 times, with each time lasting not less than 30 minutes. Through the refining operation of the present application, the purity of the molten aluminum can be significantly improved, gases and impurities can be removed, and pores and inclusions in the casting can be reduced, thereby enhancing the density, strength, toughness and corrosion resistance of the alloy, meeting the requirements for high-performance aluminum-silicon master alloys in the high-end manufacturing field.

[0022] As a preferred technical solution, in the standing and ingot casting operation in step S8: after heat preservation, it is rapidly cooled to room temperature, and the cooling rate is controlled at 10 - 20°C / s. The rapid cooling (such as water spraying cooling or spray cooling) of the present application can refine the crystal grain structure of the alloy and improve the strength and toughness of the alloy.

[0023] As a preferred technical solution, during the feeding operation in step S1, the feeding mass ratio of the A00 aluminum ingot, metallic silicon and A356 aluminum chips is 5:2 - 3:15 - 25.

[0024] As a preferred technical solution, during the feeding operation in step S2, the feeding amount ratio of the A356 aluminum chips to the first feeding amount of the A356 aluminum chips is 1:1 to 3.

[0025] Another aspect of the present invention is to provide a green and low-carbon recycled resource aluminum-silicon master alloy. The aluminum-silicon master alloy is prepared by the preparation method of the green and low-carbon recycled resource aluminum-silicon master alloy as described above. The chemical composition of the aluminum-silicon master alloy by weight percentage is: Si is 10-20%, Fe≤0.2%, Cu≤0.1%, Zn≤0.1%, Mg is 0.5-0.6%, Ti is 0.2-0.25%, Pb≤0.05%, Sn≤0.01%, Ni≤0.1%, other elements≤0.15%, and the balance is Al.

[0026] The beneficial effects of the present invention:

[0027] The preparation method of the green and low-carbon recycled resource aluminum-silicon master alloy of the present invention innovatively introduces a number of improvement measures in the pretreatment, microalloying treatment, modification treatment, grain refinement operation and optimized heat treatment process of A356 aluminum chips, not only realizing the efficient utilization of recycled aluminum chips and the precise control of alloy composition, but also significantly improving the alloy performance. This design not only enhances the strength and toughness of the alloy, but also maintains good casting performance and corrosion resistance, helps to improve the long-term stability and service life of the product, and at the same time realizes the recycling of resources and green production.

[0028] Generally speaking, the green and low-carbon recycled resource aluminum-silicon master alloy 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-performance aluminum alloy materials in high-end manufacturing fields such as automobiles and aerospace. In addition, by efficiently using the recycled resource of A356 aluminum chips, the present invention reduces the production cost while significantly reducing the dependence on primary aluminum, has significant economic and environmental benefits, and meets the requirements of sustainable development. Specific embodiments

[0029] 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 in the following description are only examples, and those skilled in the art can think of other obvious variations.

[0030] Example 1

[0031] The preparation method of the green and low-carbon recycled resource aluminum-silicon master alloy in this example includes the following steps:

[0032] S1 Charging operation: Charge A00 aluminum ingots, metallurgical silicon, and pretreated A356 aluminum chips into the hot furnace one by one according to the ratio, heat up for 2 hours, control the aluminum liquid temperature at 700 °C, and stir and melt evenly; the pretreatment operation of the A356 aluminum chips includes classification, cleaning, drying, and degreasing. The charging mass ratio of the A00 aluminum ingots, metallurgical silicon, and A356 aluminum chips is 5:2.46:20. After the charging is completed, stir the aluminum liquid evenly repeatedly, take samples for spectral detection and analysis of the composition, and control the Fe content.

[0033] S2 Refilling operation: Charge a certain proportion of A356 aluminum chips again and cover the metallurgical silicon for silicon erosion operation, heat up for 2.5 hours, control the aluminum liquid temperature at 710 °C, and stir and melt evenly; the charging amount of the A356 aluminum chips in this time is in the ratio of 1:2 to the charging amount of the A356 aluminum chips in the first time.

[0034] S3 Skimming operation: Place the ash hopper into the hot furnace, add an appropriate amount of slag remover, stir to make the ash slag float up, and then slowly skim off the ash slag on the surface of the aluminum liquid; the slag remover is composed of silicon carbide as a reducing agent and magnesium fluoride with a mass ratio of 1:5.

[0035] S4 Iron suction operation: Connect the power supply as required, put the iron suction machine into the hot furnace for preheating, rotate back and forth at a position 10 cm from the furnace bottom to suck out the iron, control the aluminum liquid temperature at 690 °C, and the single iron suction time does not exceed 2 minutes.

[0036] S5 First composition adjustment operation: Stir evenly repeatedly and then take samples for spectral detection and analysis of the composition. According to the detection results, supplement metallurgical silicon, heat up to 780 °C, stir evenly, and fully melt the titanium agent element. After the first composition adjustment operation in step S5, perform modification treatment: Add an appropriate amount of modifier ferrophosphorus to the high-temperature aluminum liquid, stir evenly and then let it stand for 10 minutes to make the modifier react fully. Perform spectral detection and analysis again to control the silicon and titanium contents.

[0037] S6 Refining operation: Heat up to 720 °C for refining operation, use nitrogen with a purity of 99.999%, refine 2 times, each time for no less than 30 minutes, and skim off the ash slag on the surface of the aluminum liquid in multiple times after refining.

[0038] S7 Second composition adjustment operation: Stir evenly repeatedly and then take samples for spectral detection and analysis of the composition. According to the detection results, supplement magnesium ingots and prevent the magnesium ingots from being burned. Perform spectral detection and analysis again to determine that the composition is qualified.

[0039] S8 Standing and Ingot Casting Operation: After standing for 20 minutes, the molten aluminum is poured into an ingot mold preheated by a water separator. The temperature of the molten aluminum is controlled at 710 °C, and after holding for 4 hours, it is rapidly cooled to room temperature. The cooling rate is controlled at 15 °C / s. After passing the inspection, the aluminum-silicon master alloy is obtained (bubbles, unsightly, unqualified ingots are detected. The weight of the aluminum bar is 6 - 6.5 kg, 16 layers, about 700 kg per stack). The chemical composition of the aluminum-silicon master alloy is by weight percentage: Si is 16.8%, Fe is 0.15%, Cu is 0.1%, Zn is 0.07%, Mg is 0.55%, Ti is 0.21%, Pb is 0.03%, Sn is 0.005%, Ni is 0.06%, other elements are 0.12%, and the balance is Al.

[0040] Example 2

[0041] The preparation method of the green and low-carbon recycled resource aluminum-silicon master alloy in this example, the preparation method includes the following steps:

[0042] S1 Feeding Operation: The A00 aluminum ingot, metallic silicon, and pretreated A356 aluminum chips are sequentially fed into a hot furnace at a ratio, and the temperature is raised for 3 hours. The temperature of the molten aluminum is controlled at 710 °C, and it is stirred and melted evenly; the pretreatment operation of the A356 aluminum chips includes classification, cleaning, drying, and degreasing. The feeding mass ratio of the A00 aluminum ingot, metallic silicon, and A356 aluminum chips is 5:3:25. After the feeding is completed, the molten aluminum is stirred evenly repeatedly, and a sample is taken for spectral detection and analysis of the composition, and the Fe content is controlled.

[0043] S2 Supplementary Feeding Operation: A certain proportion of A356 aluminum chips are fed again and the metallic silicon is covered for silicon erosion operation. The temperature is raised for 2.5 hours. The temperature of the molten aluminum is controlled at 710 °C, and it is stirred and melted evenly; the feeding amount of the A356 aluminum chips in this time is in a ratio of 1:3 to the feeding amount of the A356 aluminum chips in the first time.

[0044] S3 Skimming Operation: A ash hopper is placed in the hot furnace, an appropriate amount of slag remover is added, and it is stirred to make the ash slag float up, and then the ash slag on the surface of the molten aluminum is slowly skimmed out; the slag remover is composed of silicon carbide as a reducing agent and magnesium fluoride with a mass ratio of 1:4.

[0045] S4 Iron Absorbing Operation: Connect the power supply as required. After the iron absorber is placed in the hot furnace for preheating, it rotates back and forth at a position 10 cm from the furnace bottom to suck out the iron. The temperature of the molten aluminum is controlled at 700 °C, and the single iron absorption time does not exceed 2 minutes.

[0046] S5 Primary composition adjustment operation: After stirring evenly repeatedly, take samples, conduct spectral detection and analysis of the composition, supplement metallurgical silicon according to the detection results, heat up to 780 °C, stir evenly, and fully melt the titanium agent elements. After the primary composition adjustment operation in step S5, carry out modification treatment: Add an appropriate amount of modifier ferrophosphorus to the high-temperature aluminum liquid, stir evenly and then let it stand for 10 minutes to make the modifier react fully. Conduct spectral detection and analysis again to control the silicon and titanium contents.

[0047] S6 Refining operation: Heat up to 720 °C, carry out the refining operation, use nitrogen with a purity of 99.999%, refine 2 times, with each time lasting not less than 30 minutes. After refining, remove the slag on the surface of the aluminum liquid in multiple batches.

[0048] S7 Secondary composition adjustment operation: After stirring evenly repeatedly, take samples, conduct spectral detection and analysis of the composition, supplement magnesium ingots according to the detection results, and prevent the magnesium ingots from being burned. Conduct spectral detection and analysis again to determine that the composition is qualified.

[0049] S8 Standing and ingot casting operation: After standing for 20 minutes, pour the aluminum liquid into a preheated ingot mold, control the temperature of the aluminum liquid at 710 °C, keep it warm for 4 hours and then quickly cool it to room temperature, control the cooling rate at 20 °C / s. After passing the inspection, obtain the aluminum-silicon master alloy (if there are bubbles, unappealing appearance, or unqualified ingots are detected, the weight of the aluminum bar is 6 - 6.5 kg, 16 layers, about 700 kg / stack). The chemical composition of the aluminum-silicon master alloy is calculated by weight percentage as follows: Si is 18.2%, Fe is 0.18%, Cu is 0.05%, Zn is 0.06%, Mg is 0.58%, Ti is 0.22%, Pb is 0.03%, Sn is 0.007%, Ni is 0.05%, other elements are 0.11%, and the balance is Al.

[0050] Example 3

[0051] The preparation method of the green and low-carbon recycled resource aluminum-silicon master alloy in this example, the preparation method includes the following steps:

[0052] S1 Feeding operation: Put A00 aluminum ingots, metallurgical silicon, and pretreated A356 aluminum chips into the hot furnace one by one according to the ratio, heat up for 2 hours, control the temperature of the aluminum liquid at 690 °C, and stir and melt evenly; The pretreatment operation of the A356 aluminum chips includes classification, cleaning, drying, and degreasing. The feeding mass ratio of the A00 aluminum ingots, metallurgical silicon, and A356 aluminum chips is 5:2.5:18. After the feeding is completed, stir the aluminum liquid evenly repeatedly, take samples for spectral detection and analysis of the composition, and control the Fe content.

[0053] S2 Scrap feeding operation: Re-inject a certain proportion of A356 aluminum chips and cover the metallurgical silicon for silicon erosion operation. Heat up for 2 hours, control the temperature of the molten aluminum at 700 °C, and stir and melt evenly; the feeding amount ratio of the A356 aluminum chips to the first feeding amount of A356 aluminum chips is 1:1.

[0054] S3 Skimming operation: Place the ash hopper into the hot furnace, add an appropriate amount of slag remover, stir to make the ash slag float, and then slowly skim the ash slag on the surface of the molten aluminum; the slag remover is composed of silicon carbide as a reducing agent and magnesium fluoride with a mass ratio of 1:3.

[0055] S4 Magnetic separation operation: Connect the power supply as required. After preheating the magnetic separator in the hot furnace, rotate it back and forth at a position 10 cm from the furnace bottom to suck out the iron. Control the temperature of the molten aluminum at 700 °C, and the single magnetic separation time does not exceed 2 minutes. After the magnetic separation operation, microalloying treatment is carried out: during the melting process, a small amount of aluminum yttrium magnesium alloy is added to the molten aluminum in the form of an intermediate alloy, stirred evenly and then kept warm for 2 hours to ensure the full diffusion of trace elements.

[0056] S5 Primary composition adjustment operation: After stirring evenly repeatedly, take samples for spectral detection and analysis of the composition. According to the detection results, supplement metallurgical silicon, heat up to 780 °C, stir evenly, and fully melt the titanium agent element. After the primary composition adjustment operation in step S5, modification treatment is carried out: add an appropriate amount of modifier ferrophosphorus to the high-temperature molten aluminum, stir evenly and then let it stand for 10 minutes to make the modifier react fully. Conduct spectral detection and analysis again to control the silicon and titanium contents.

[0057] S6 Refining operation: Heat up to 720 °C for refining operation. Use nitrogen with a purity of 99.999%, refine 2 times, and each time the duration is not less than 30 minutes. After refining, skim the ash slag on the surface of the molten aluminum in multiple times.

[0058] S7 Secondary composition adjustment operation: After stirring evenly repeatedly, take samples for spectral detection and analysis of the composition. According to the detection results, supplement magnesium ingots to prevent the magnesium ingots from being burned. Conduct spectral detection and analysis again to determine that the composition is qualified.

[0059] S8 Standing and Ingot Casting Operation: After standing for 15 minutes, the molten aluminum is poured into a preheated ingot mold. The temperature of the molten aluminum is controlled at 700 °C, and after holding for 4 hours, it is rapidly cooled to room temperature. The cooling rate is controlled at 10 °C / s. After passing the inspection, the aluminum-silicon master alloy is obtained (bubbles, unappealing appearance, and unqualified ingots are detected. The weight of the aluminum bars is 6 - 6.5 kg, 16 layers, approximately 700 kg per stack). The chemical composition of the aluminum-silicon master alloy is as follows by weight percentage: Si is 13.5%, Fe is 0.16%, Cu is 0.08%, Zn is 0.08%, Mg is 0.56%, Ti is 0.25%, Pb is 0.02%, Sn is 0.008%, Ni is 0.06%, other elements are 0.13%, and the balance is Al.

[0060] Comparative Example 1

[0061] The preparation method of the green, low-carbon and recycled resource aluminum-silicon master alloy in this comparative example is basically the same as that of Example 1 in terms of raw material composition and preparation steps. The difference is that in the preparation method of this comparative example, no modification treatment is carried out.

[0062] Comparative Example 2

[0063] The preparation method of the green, low-carbon and recycled resource aluminum-silicon master alloy in this comparative example is basically the same as that of Example 1 in terms of raw material composition and preparation steps. The difference is that in the preparation method of this comparative example, no rapid cooling treatment is carried out.

[0064] The green, low-carbon and recycled resource aluminum-silicon master alloys prepared in Examples 1 - 3 and Comparative Examples 1 - 2 are subjected to performance tests, and the performance results are shown in Table 1:

[0065] Among them, the tensile strength and elongation are tested according to GB / T 228.1.

[0066] Table 1

[0067]

[0068] 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 by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A preparation method of a green and low-carbon recycled resource aluminum-silicon master alloy, characterized in that, The preparation method includes the following steps: S1 Feeding operation: Put A00 aluminum ingots, metallic silicon, and pretreated A356 aluminum chips into a hot furnace one by one according to the proportion, heat up for 2 - 3 hours, control the aluminum liquid temperature at 690 - 710 °C, and stir and melt evenly; S2 Refilling operation: Put in a certain proportion of A356 aluminum chips again and cover the metallic silicon for silicon erosion operation, heat up for 1.5 - 2.5 hours, control the aluminum liquid temperature at 690 - 710 °C, and stir and melt evenly; S3 Skimming operation: Put an ash hopper into the hot furnace, add an appropriate amount of slag remover, stir to make the ash slag float up, and then slowly skim the ash slag on the surface of the aluminum liquid; S4 Iron suction operation: Connect the power supply as required, put the iron suction machine into the hot furnace for preheating, then rotate back and forth at a position 8 - 12 cm from the furnace bottom to suck out the iron. Control the aluminum liquid temperature at 680 - 700 °C, and the single - time iron suction time does not exceed 2 minutes; S5 Primary composition adjustment operation: After stirring evenly repeatedly, take samples for spectral detection and analysis of the composition. According to the detection results, supplement metallic silicon, heat up to 780 °C ± 5 °C, stir evenly, and fully melt the titanium agent element; S6 Refining operation: Heat up to 720 °C ± 5 °C for refining operation. After refining, skim the ash slag on the surface of the aluminum liquid in multiple times; S7 Secondary composition adjustment operation: After stirring evenly repeatedly, take samples for spectral detection and analysis of the composition. According to the detection results, supplement magnesium ingots; S8 Standing and ingot casting operation: After standing for 15 - 20 minutes, pour the aluminum liquid into a preheated ingot mold, control the aluminum liquid temperature at 700 - 710 °C, keep warm for 2 - 4 hours and then cool to room temperature. After passing the inspection, the aluminum - silicon master alloy is obtained; After the iron suction operation in step S4, micro - alloying treatment is also carried out: During the smelting process, trace rare earth elements are added to the aluminum liquid in the form of master alloy, stirred evenly and then subjected to heat preservation treatment to ensure the full diffusion of trace elements. Before the refining operation in step S6, modification treatment is also carried out: When the aluminum liquid temperature reaches 710 °C ± 5 °C, add an appropriate amount of modifier, stir evenly and then stand for 10 - 15 minutes to make the modifier fully react. In the standing and ingot casting operation in step S8: After heat preservation, quickly cool to room temperature, control the cooling rate at 10 - 20 °C / s, and then keep warm at an aging temperature of 150 - 200 °C for 6 - 12 hours, and naturally cool to obtain the aluminum - silicon master alloy. During the feeding operation in step S1, the feeding mass ratio of A00 aluminum ingots, metallic silicon, and A356 aluminum chips is 5:2 - 3:15 - 25.

2. The preparation method of the green and low-carbon recycled resource aluminum-silicon master alloy according to claim 1, wherein The pretreatment operation of the A356 aluminum chips includes at least one of classification, cleaning, drying, and degreasing.

3. The preparation method of the green and low-carbon recycled resource aluminum-silicon master alloy according to claim 1, characterized in that, During the skimming operation in step S3, the slag remover is composed of a reducing agent and fluoride and / or chloride.

4. The preparation method of the green and low-carbon recycled resource aluminum-silicon master alloy according to claim 1, characterized in that, During the refining operation in step S6, the purity of nitrogen is 99.999%, and the refining is carried out 2 times, with each time lasting not less than 30 minutes.

5. The preparation method of the green and low-carbon recycled resource aluminum-silicon master alloy according to claim 1, characterized in that, During the refilling operation in step S2, the feeding amount ratio of the A356 aluminum chips to the first - time feeding amount of A356 aluminum chips is 1:1 - 3.

6. A green and low-carbon recycled resource aluminum-silicon master alloy, characterized in that, The aluminum-silicon master alloy is prepared by using the preparation method of the green low-carbon recycled resource aluminum-silicon master alloy according to any one of claims 1 to 5. The chemical composition of the aluminum-silicon master alloy is by weight percentage: Si is 10-20%, Fe≤0.2%, Cu≤0.1%, Zn≤0.1%, Mg is 0.5-0.6%, Ti is 0.2-0.25%, Pb≤0.05%, Sn≤0.01%, Ni≤0.1%, other elements≤0.15%, and the balance is Al.

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