Green low-carbon renewable resource aluminum-silicon intermediate alloy and preparation method thereof

Abstract

The invention discloses a preparation method of a green low-carbon renewable resource aluminum-silicon intermediate alloy. The preparation method comprises the following steps that S1, an A00 aluminum ingot, metal silicon and A356 aluminum skimmings are put into a heat furnace to be stirred and melted into molten aluminum; s2, adding the A356 aluminum skimmings again, covering the metal silicon, and carrying out erosion silicon melting operation; s3, a deslagging agent is added to enable ash to float, and slagging-off operation is carried out; s4, the iron attracting machine is put into a heating furnace to be preheated, and then iron attracting operation is conducted; s5, metal silicon is supplemented, and a titanium agent is added for full melting; s6, raising the temperature to carry out refining operation, and removing ash residues after refining; s7, supplementing magnesium ingots; and S8, after standing, casting the molten aluminum, and cooling to obtain the aluminum-silicon intermediate alloy. According to the preparation method, efficient recycling of the A356 aluminum skimmings is achieved, the aluminum-silicon intermediate alloy has excellent mechanical performance and good casting performance, 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-silicon master alloys, and in particular to a green, low-carbon, renewable resource aluminum-silicon master alloy 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. However, with the development of industry, a large amount of aluminum scraps are produced in the production process of A356 aluminum alloy. These aluminum scraps contain rich aluminum resources. If they are directly discarded, it will not only cause resource waste, but also increase production costs and environmental burden. Therefore, how to efficiently use these aluminum scraps has become an important issue in the field of aluminum alloy production.

[0003] Traditional methods of recycling aluminum scraps mainly focus on simple recovery and remelting, but this method has many problems. First, the composition of aluminum scraps is complex and contains impurities in different proportions, such as iron, copper, zinc, etc. These impurities will affect the performance of the recycled alloy. Secondly, aluminum scraps 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 applications.

[0004] At present, although there are some technologies for aluminum scrap recycling on the market, most of these technologies focus on single impurity removal or composition adjustment and lack systematic solutions. Therefore, developing an efficient, green and stable production method for A356 aluminum scrap recycling and smelting is of great significance for improving resource utilization, reducing production costs and reducing environmental pollution. Summary of the invention

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

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0007] A method for preparing a green, low-carbon, renewable resource aluminum-silicon master alloy, the preparation method comprising the following steps:

[0008] S1 Feeding operation: put A00 aluminum ingot, metal silicon and pre-treated A356 aluminum chips into the hot furnace one by one in proportion, heat up for 2 to 3 hours, control the aluminum liquid temperature at 690 to 710°C, and stir to melt evenly;

[0009] S2 feeding operation: add a certain proportion of A356 aluminum chips again and cover the metal silicon to perform silicon etching operation, heat up for 1.5 to 2.5 hours, control the aluminum liquid temperature at 690 to 710°C, and stir to melt evenly;

[0010] S3 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;

[0011] S4: 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 680 to 700 ° C. The single iron absorption time shall not exceed 2 minutes;

[0012] S5: First component adjustment operation: Stir repeatedly and take samples, perform spectrum detection and composition analysis, add metal silicon according to the test results, heat up to 780℃±5℃, stir evenly, and fully melt the titanium element;

[0013] S6 refining operation: raise the temperature to 720℃±5℃, carry out refining operation, use nitrogen with purity of 99.999%, refining twice, each time for not less than 30 minutes, and scrape off the ash on the surface of the aluminum liquid several times after refining;

[0014] S7 secondary composition adjustment operation: take samples after repeated stirring, perform spectrum detection and composition analysis, and replenish magnesium ingots according to the test results;

[0015] 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 aluminum-silicon intermediate alloy is obtained after passing the inspection.

[0016] The green and low-carbon recycled resource aluminum-silicon intermediate alloy preparation method of the present invention not only effectively reduces the impurity content, improves the utilization rate of recycled aluminum, and reduces production costs by pre-treating A356 aluminum chips, but also reduces dependence on primary aluminum, which is in line with the green and low-carbon production concept; and through multiple spectral detection and analysis and component adjustment, the alloy composition is accurately controlled, the stability and consistency of the alloy performance are ensured, and the mechanical properties and corrosion resistance of the alloy are optimized.

[0017] As a preferred technical solution, the pretreatment operation of the A356 aluminum chips includes at least one step of classification, cleaning, drying and degreasing. The present application can effectively remove impurities, oil stains and moisture in the A356 aluminum chips through pretreatment operations such as classification, cleaning, drying and degreasing, reduce impurity pollution and oxidation problems during the smelting process, improve the purity and recovery rate of the aluminum liquid, and thus improve the quality and performance of the final product.

[0018] As a preferred technical solution, during the slag removal operation in step S3, the slag remover is composed of a reducing agent and fluoride and / or chloride. The slag remover of the present application is composed of a reducing agent (such as silicon carbide, boride, etc.) and 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; fluoride and chloride can lower the melting point of the slag, making the slag easier to float and be removed, reducing slag inclusion defects and improving product quality.

[0019] As a preferred technical solution, after the iron absorption operation process in step S4, a microalloying treatment is also performed: during the smelting process, a trace amount of rare earth elements (such as yttrium and cerium) is added to the aluminum liquid in the form of an intermediate alloy, and after stirring evenly, a heat preservation treatment is performed to ensure that the trace elements are fully diffused. The microalloying treatment of the present application can refine the grains, reduce the needle-like structure of the silicon phase, and further improve the toughness of the alloy by adding a trace amount of rare earth elements.

[0020] As a preferred technical solution, a modification treatment is also performed before the refining operation in step S6: when the temperature of the aluminum liquid reaches 710℃±5℃, an appropriate amount of a modifier is added, stirred evenly and then allowed to stand for 10 to 15 minutes to allow the modifier to fully react. The modification treatment of the present application can change the morphology of the silicon phase from a needle-like 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 tendency to thermal cracking. In addition, the modification treatment can also improve the fluidity of the alloy and improve the surface quality and dimensional accuracy of the casting.

[0021] As a preferred technical solution, during the refining operation of step S6, nitrogen with a purity of 99.999% is used, and the refining is performed twice, each time for no less than 30 minutes. Through the refining operation, the present application can significantly improve the purity of the aluminum liquid, remove gas and impurities, reduce 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-silicon master alloys in the high-end manufacturing field.

[0022] As a preferred technical solution, in step S8, during the standing and ingot casting operation: after heat preservation, rapidly cool to room temperature, and control the cooling rate to 10-20°C / s. Rapid cooling (such as water spray cooling or spray cooling) in this application can refine the grain structure of the alloy and improve the strength and toughness of the alloy.

[0023] As a preferred technical solution, during the feeding operation of 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 of step S2, the ratio of the feeding amount of the A356 aluminum chips to the first feeding amount of the A356 aluminum chips is 1:1-3.

[0025] Another aspect of the present invention is to provide a green, low-carbon, renewable resource aluminum-silicon master alloy, which is prepared by the above-mentioned green, low-carbon, renewable resource aluminum-silicon master alloy preparation method. The chemical composition of the aluminum-silicon master alloy is as follows 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.

[0026] Beneficial effects of the present invention:

[0027] The preparation method of the green low-carbon recycled resource aluminum-silicon master alloy of the present invention not only realizes the efficient utilization of recycled aluminum chips and the precise control of alloy composition, but also realizes the significant improvement of alloy performance by innovatively introducing multiple improvement measures in the pretreatment, microalloying, modification, grain refinement and optimized heat treatment process of A356 aluminum chips. 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, and at the same time realizes the recycling of resources and green production.

[0028] In general, the green, 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 utilizing the recycled resource of A356 aluminum chips, the present invention significantly reduces the dependence on primary aluminum while reducing production costs, has significant economic and environmental benefits, and meets the requirements of sustainable development. DETAILED DESCRIPTION

[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 described below are only examples, and those skilled in the art may think of other obvious variations.

[0030] Example 1

[0031] The preparation method of the green low-carbon recycled aluminum-silicon master alloy in this embodiment comprises the following steps:

[0032] S1 Feeding operation: A00 aluminum ingot, metal silicon and pre-treated A356 aluminum chips are fed into the hot furnace one by one in proportion, heated for 2 hours, and the aluminum liquid temperature is controlled at 700℃, and stirred to melt evenly; the pre-treatment operation of the A356 aluminum chips includes classification, cleaning, drying and degreasing. The feeding mass ratio of the A00 aluminum ingot, metal silicon and A356 aluminum chips is 5:2.46:20. After the feeding is completed, the aluminum liquid is repeatedly stirred evenly, and samples are taken for spectral detection and analysis of the composition to control the Fe content.

[0033] S2 feeding operation: add a certain proportion of A356 aluminum chips again and cover the metal silicon to perform silicon etching operation, heat up for 2.5 hours, control the aluminum liquid temperature at 710°C, stir and melt evenly; the ratio of the feeding amount of A356 aluminum chips to the first feeding amount of A356 aluminum chips is 1:2.

[0034] S3 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 1:5.

[0035] S4 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 aluminum liquid temperature at 690°C. The single iron absorption time shall not exceed 2 minutes.

[0036] S5: First component adjustment operation: repeatedly stir evenly and take samples, perform spectral detection and analysis of components, add metal silicon according to the test results, heat up to 780℃, stir evenly, and add titanium agent elements to fully melt. After the first component adjustment operation in step S5, perform modification treatment: add an appropriate amount of modifying agent ferrophosphorus to the high-temperature aluminum liquid, stir evenly and let it stand for 10 minutes to allow the modifying agent to fully react. Perform spectral detection and analysis again to control the silicon and titanium content.

[0037] S6 refining operation: raise the temperature to 720℃, carry out refining operation, use nitrogen with purity of 99.999%, refine twice, each time lasting not less than 30 minutes, and scrape off the ash on the surface of the aluminum liquid several times after refining.

[0038] S7 Secondary component adjustment operation: After repeated stirring, take samples, perform spectrum detection and analysis of components, replenish magnesium ingots according to the test results to prevent the magnesium ingots from being burned. Perform spectrum detection and analysis again to determine whether the components are qualified.

[0039] S8 Standing and ingot casting operation: After standing for 20 minutes, cast the aluminum liquid into the ingot casting mold preheated by the water distributor, control the aluminum liquid temperature at 710℃, keep it warm for 4 hours and then quickly cool it to room temperature, control the cooling rate at 15℃ / s, and obtain the aluminum silicon master alloy after passing the inspection (the aluminum ingots with bubbles, unsightly and unqualified are detected, the weight of the aluminum bar is 6-6.5kg, 16 layers, about 700kg / stamp). The chemical composition of the aluminum silicon master alloy is calculated 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 low-carbon recycled aluminum-silicon master alloy in this embodiment comprises the following steps:

[0042] S1 Feeding operation: A00 aluminum ingot, metal silicon and pre-treated A356 aluminum chips are fed into the hot furnace one by one in proportion, heated for 3 hours, the aluminum liquid temperature is controlled at 710℃, and stirred to melt evenly; the pre-treatment operation of the A356 aluminum chips includes classification, cleaning, drying and degreasing. The feeding mass ratio of the A00 aluminum ingot, metal silicon and A356 aluminum chips is 5:3:25. After the feeding is completed, the aluminum liquid is repeatedly stirred evenly, and samples are taken for spectral detection and analysis of the composition to control the Fe content.

[0043] S2 feeding operation: add a certain proportion of A356 aluminum chips again and cover the metal silicon to perform silicon etching operation, heat up for 2.5 hours, control the aluminum liquid temperature at 710°C, stir and melt evenly; the ratio of the feeding amount of A356 aluminum chips to the first feeding amount of A356 aluminum chips is 1:3.

[0044] S3 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.

[0045] S4 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, the aluminum liquid temperature is controlled at 700°C, and the single iron absorption time does not exceed 2 minutes.

[0046] S5: First component adjustment operation: repeatedly stir evenly and take samples, perform spectral detection and analysis of components, add metal silicon according to the test results, heat up to 780℃, stir evenly, and add titanium agent elements to fully melt. After the first component adjustment operation in step S5, perform modification treatment: add an appropriate amount of modifying agent ferrophosphorus to the high-temperature aluminum liquid, stir evenly and let it stand for 10 minutes to allow the modifying agent to fully react. Perform spectral detection and analysis again to control the silicon and titanium content.

[0047] S6 refining operation: raise the temperature to 720℃, carry out refining operation, use nitrogen with purity of 99.999%, refine twice, each time lasting not less than 30 minutes, and scrape off the ash on the surface of the aluminum liquid several times after refining.

[0048] S7 Secondary component adjustment operation: After repeated stirring, take samples, perform spectrum detection and analysis of components, replenish magnesium ingots according to the test results to prevent the magnesium ingots from being burned. Perform spectrum detection and analysis again to determine whether the components are qualified.

[0049] 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℃, keep it warm for 4 hours and then quickly cool it to room temperature, control the cooling rate at 20℃ / s, and obtain the aluminum silicon master alloy after passing the inspection (the aluminum ingots with bubbles, unsightly, and unqualified are detected, the weight of the aluminum bar is 6-6.5kg, 16 layers, about 700kg / stamp). The chemical composition of the aluminum silicon master alloy is calculated by weight percentage: 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 low-carbon recycled aluminum-silicon master alloy in this embodiment comprises the following steps:

[0052] S1 Feeding operation: A00 aluminum ingot, metal silicon and pre-treated A356 aluminum chips are fed into the hot furnace one by one in proportion, heated for 2 hours, and the aluminum liquid temperature is controlled at 690°C, and stirred to melt evenly; the pre-treatment operation of the A356 aluminum chips includes classification, cleaning, drying and degreasing. The feeding mass ratio of the A00 aluminum ingot, metal silicon and A356 aluminum chips is 5:2.5:18. After the feeding is completed, the aluminum liquid is repeatedly stirred evenly, and samples are taken for spectral detection and analysis of the composition to control the Fe content.

[0053] S2 feeding operation: add a certain proportion of A356 aluminum chips again and cover the metal silicon to perform silicon etching operation, heat up for 2 hours, control the aluminum liquid temperature at 700°C, stir and melt evenly; the ratio of the feeding amount of A356 aluminum chips to the first feeding amount of A356 aluminum chips is 1:1.

[0054] S3 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.

[0055] S4 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 700°C. The single iron absorption time does not exceed 2 minutes. Micro-alloying treatment is performed after the iron absorption operation process: During the smelting process, a small amount of aluminum yttrium magnesium 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.

[0056] S5: First component adjustment operation: repeatedly stir evenly and take samples, perform spectral detection and analysis of components, add metal silicon according to the test results, heat up to 780℃, stir evenly, and add titanium agent elements to fully melt. After the first component adjustment operation in step S5, perform modification treatment: add an appropriate amount of modifying agent ferrophosphorus to the high-temperature aluminum liquid, stir evenly and let it stand for 10 minutes to allow the modifying agent to fully react. Perform spectral detection and analysis again to control the silicon and titanium content.

[0057] S6 refining operation: raise the temperature to 720℃, carry out refining operation, use nitrogen with purity of 99.999%, refine twice, each time lasting not less than 30 minutes, and scrape off the ash on the surface of the aluminum liquid several times after refining.

[0058] S7 Secondary component adjustment operation: After repeated stirring, take samples, perform spectrum detection and analysis of components, replenish magnesium ingots according to the test results to prevent the magnesium ingots from being burned. Perform spectrum detection and analysis again to determine whether the components are qualified.

[0059] 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 700℃, keep it warm for 4 hours and then quickly cool it to room temperature, control the cooling rate at 10℃ / s, and obtain the aluminum-silicon master alloy after passing the inspection (the aluminum ingots with bubbles, unsightly, and unqualified are detected, the aluminum bar weight is 6-6.5kg, 16 layers, about 700kg / stamp). The chemical composition of the aluminum-silicon master alloy is calculated 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 raw material composition and preparation steps of the preparation method of the green low-carbon recycled resource aluminum-silicon intermediate alloy in this comparative example are basically the same as those in Example 1, except that no modification treatment is performed in the preparation method of this comparative example.

[0062] Comparative Example 2

[0063] The raw material composition and preparation steps of the preparation method of the green low-carbon recycled resource aluminum-silicon intermediate alloy in this comparative example are basically the same as those in Example 1, except that, in the preparation method of this comparative example, no rapid cooling treatment is performed.

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

[0065] Among them, tensile strength and elongation are tested according to GB / T 228.1. Table 1

[0066] 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, renewable resource aluminum-silicon master alloy, characterized in that: The preparation method comprises the following steps: S1 Feeding operation: put A00 aluminum ingot, metal silicon and pre-treated A356 aluminum chips into the hot furnace one by one in proportion, heat up for 2 to 3 hours, control the aluminum liquid temperature at 690 to 710°C, and stir to melt evenly; S2 feeding operation: add a certain proportion of A356 aluminum chips again and cover the metal silicon to perform silicon etching operation, heat up for 1.5 to 2.5 hours, control the aluminum liquid temperature at 690 to 710°C, and stir to melt evenly; S3 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; S4: 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 680 to 700 ° C. The single iron absorption time shall not exceed 2 minutes; S5: First component adjustment operation: Stir repeatedly and take samples, perform spectrum detection and composition analysis, add metal silicon according to the test results, heat up to 780℃±5℃, stir evenly, and fully melt the titanium element; S6 refining operation: heating to 720℃±5℃, refining operation, after refining, remove the ash on the surface of aluminum liquid several times; S7 secondary composition adjustment operation: take samples after repeated stirring, perform spectrum detection and composition analysis, and replenish magnesium ingots according to the test results; 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 aluminum-silicon intermediate alloy is obtained after passing the inspection.

2. The method for preparing the green, low-carbon, renewable resource aluminum-silicon master alloy according to claim 1, characterized in that: The pre-treatment operation of the A356 aluminum chips includes at least one step of sorting, cleaning, drying and degreasing.

3. The method for preparing the green, low-carbon, renewable resource aluminum-silicon master alloy according to claim 1, characterized in that: During the slagging operation in step S3, the slagging agent is composed of a reducing agent and fluoride and / or chloride.

4. The method for preparing the green, low-carbon, renewable resource aluminum-silicon master alloy according to claim 1, characterized in that: After the iron absorption operation process in step S4, micro-alloying treatment is also performed: during the smelting process, a trace amount of rare earth elements are added to the aluminum liquid in the form of a master 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 the green, low-carbon, renewable resource aluminum-silicon master alloy according to claim 1, characterized in that: Before the refining operation in step S6, a modification treatment is also performed: when the temperature of the aluminum liquid reaches 710°C±5°C, a proper amount of a modification agent is added, stirred evenly, and then allowed to stand for 10 to 15 minutes to allow the modification agent to fully react.

6. The method for preparing the green, low-carbon, renewable resource aluminum-silicon master alloy according to claim 1, characterized in that: During the refining operation in step S6, nitrogen with a purity of 99.999% is used and the refining is performed twice, each time for no less than 30 minutes.

7. The method for preparing the green, low-carbon, renewable resource aluminum-silicon master alloy according to claim 1, characterized in that: In step S8, during the standing and casting operation: after keeping warm, quickly cool to room temperature, and control the cooling rate at 10-20°C / s.

8. The method for preparing the green, low-carbon, renewable resource aluminum-silicon master alloy according to claim 1, characterized in that: During the feeding operation of step S1, the feeding mass ratio of the A00 aluminum ingot, the metal silicon and the A356 aluminum chips is 5:2-3:15-25.

9. The method for preparing the green, low-carbon, renewable resource aluminum-silicon master alloy according to claim 1, characterized in that: During the feeding operation in step S2, the ratio of the feeding amount of the A356 aluminum chips to the first feeding amount of the A356 aluminum chips is 1:1-3.

10. A green, low-carbon, renewable resource aluminum-silicon master alloy, characterized in that: The aluminum-silicon master alloy is prepared by the preparation method of the green, low-carbon, renewable resource aluminum-silicon master alloy as described in any one of claims 1 to 9, and the chemical composition of the aluminum-silicon master alloy is as follows 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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