A production process for preparing aluminum-silicon master alloy from recycled aluminum

Abstract

This invention provides a production process for preparing aluminum-silicon master alloys from recycled aluminum, relating to the field of recycled aluminum processing technology. The production process mainly includes: crushing aluminum scrap, adding Mn for smelting and filtering to prepare recycled aluminum liquid; smelting the recycled aluminum liquid mixed with silicon powder; smelting pure aluminum and pure silicon together; variable-temperature refining with Mg for slag removal; and casting. This invention overcomes the shortcomings of existing technologies, effectively removes slag from waste aluminum, reduces impurities in the subsequent aluminum-silicon master alloy, improves the overall quality of the alloy, and enhances the economic efficiency of production.

Description

Technical Field

[0001] This invention relates to the field of recycled aluminum processing technology, and more specifically to a production process for preparing aluminum-silicon master alloys from recycled aluminum. Background Technology

[0002] Recycled aluminum is an aluminum alloy or aluminum metal obtained by remelting and refining scrap aluminum and aluminum alloy materials or aluminum-containing waste. It is an important source of metallic aluminum. Furthermore, the energy consumption for recycling aluminum production is much lower than that for aluminum production, which reduces pollution emissions to a certain extent and has significant social and environmental benefits. Therefore, the application of recycled aluminum is becoming increasingly widespread.

[0003] For the preparation of some high-precision alloys, if recycled aluminum is chosen as the raw material, the overall refining process will be more complicated and the cost will increase accordingly. However, Al-Si series cast aluminum alloys are an alloy system with relatively high tolerance for the types and contents of impurity elements. Using recycled aluminum to prepare aluminum-silicon master alloys is an important application of recycled aluminum.

[0004] Traditional aluminum-silicon master alloy production typically involves melting pure aluminum and then adding elements such as silicon for smelting. This process is highly susceptible to oxidation, resulting in a large number of impurities in the final alloy. Using recycled aluminum to prepare the alloy will further increase the number of impurities, ultimately leading to inclusions within the alloy. This will reduce the performance and quality of the final master alloy, limiting its application in high-precision products. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a production process for preparing aluminum-silicon master alloys from recycled aluminum. This process effectively removes slag from waste aluminum and reduces impurities in the subsequent aluminum-silicon master alloys, thereby improving the overall quality of the alloy and enhancing the economic benefits of production.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented through the following technical solution:

[0007] A production process for preparing aluminum-silicon master alloys from recycled aluminum, the production process comprising the following steps:

[0008] S1. Pre-treatment of aluminum waste: The aluminum waste is crushed, then the crushed waste is smelted, the slag is removed and filtered, the filtrate is added with Mn and then kept at heat for refining, the slag is removed and filtered again, the filtrate is transferred to a container for further refining and then filtered to obtain recycled aluminum liquid for use.

[0009] S2. Material preparation: Prepare materials according to the following weight parts: 20-40 parts of recycled aluminum liquid, 4-6 parts of pure aluminum ingots, 12-20 parts of pure silicon ingots, 10-20 parts of pure silicon powder, and 0.1-0.12 parts of pure magnesium ingots.

[0010] S3. Raw material pretreatment: Place the recycled aluminum liquid in a melting furnace and keep it at 700-800℃. Then, spray pure silicon powder into the recycled aluminum liquid in multiple batches with the atmosphere. After each addition of pure silicon powder, raise the temperature by 50-80℃, stir, and let it stand for 20-30 minutes. After all the pure silicon powder has been added, continue to raise the temperature to 1450-1500℃ for melting to obtain molten liquid for later use.

[0011] S4. Secondary smelting: Pure aluminum ingots are laid at the bottom of the refining furnace, pure silicon ingots are laid on top of the pure aluminum ingots, and slag remover is added on top of the pure silicon ingots. The molten liquid is then poured into the refining furnace under the protection of argon gas. The furnace is opened and smelting continues for 10-15 minutes. Finally, pure magnesium ingots are added and smelting continues for 20-25 minutes. The slag is then removed to obtain a mixed liquid.

[0012] S5. Refining: Add refining agent to the above mixture and refine it at 800-900℃, 1200-1250℃, 1450-1480℃ and 700-800℃ respectively. After refining, remove the scum from the surface of the liquid to obtain the refined liquid.

[0013] S6. Casting and molding: After filtering the above-mentioned refining liquid, it is cast and kept at 400℃ for 2-3 hours, and then cooled to room temperature at a cooling rate of 10-15℃ / min to obtain aluminum-silicon intermediate alloy ingot.

[0014] Preferably, in step S1, the aluminum waste is crushed by first grinding and then using an air jet mill for further grinding, and the final fine powder has a particle size of 1-8 μm.

[0015] Preferably, in step S1, the melting temperature is 700-720℃, the heat preservation refining temperature is 740-750℃, the further refining temperature is 680-700℃, and a 30-mesh foam ceramic filter plate is used for filtration.

[0016] Preferably, the amount of Mn added in step S1 is 0.12%-0.20% of the total amount of aluminum scrap.

[0017] Preferably, the particle size range of the pure silicon powder in step S2 is 4-10 μm.

[0018] Preferably, step S3 is performed in a melting furnace under argon protection, and the pressure of the argon gas inside the melting furnace is 0.1-0.2 MPa.

[0019] Preferably, the time for melting at 1450-1500℃ in step S3 is 15-30 minutes.

[0020] Preferably, the slag remover in step S4 is a mixture of potassium chloride, sodium chloride, and calcium fluoride in a mass ratio of 1:22-28:0.5, and the amount of slag remover added is 0.2%-0.4% of the total mass of pure silicon ingots.

[0021] Preferably, in step S5, the refining agent is obtained by mixing potassium chloride, sodium chloride, and calcium nitrate in a mass ratio of 1:32-40:0.3, and the amount of refining agent added is 0.1%-0.3% of the total mass of pure silicon ingots.

[0022] Preferably, in step S5, the refining time is 10-12 minutes at 800-900℃, 8-10 minutes at 1200-1250℃, 15-18 minutes at 1450-1480℃, and 15-20 minutes at 700-800℃.

[0023] This invention provides a production process for preparing aluminum-silicon master alloys from recycled aluminum, which has the following advantages compared with existing technologies:

[0024] (1) The present invention performs multi-stage smelting and filtration of aluminum waste and adds Mn to remove slag, which can effectively reduce the impurities in aluminum waste, especially the Fe content. Furthermore, when preparing aluminum-silicon intermediate alloys, pure silicon powder is added in stages to effectively promote the distribution of aluminum and silicon and achieve the uniformity of the alloy. In addition, the pure silicon powder is added under an argon atmosphere, which effectively reduces the generation of impurities and improves the purity of the product.

[0025] (2) This invention uses some recycled aluminum and pure aluminum ingots as aluminum raw materials and pure silicon ingots and silicon powder as silicon raw materials. Through multiple refining processes, the overall balance of the materials is improved, and while reducing impurities, the material performance is further improved, thereby comprehensively enhancing the economic value of the product. Attached image description:

[0026] Figure 1 This is a process flow diagram for preparing aluminum-silicon intermediate alloys from recycled aluminum according to the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1:

[0029] Preparation of recycled aluminum:

[0030] The specific content of impurities other than aluminum in the selected aluminum scrap is shown in Table 1 below:

[0031] Table 1

[0032]

[0033] 1. Preparation of recycled aluminum A:

[0034] (1) The aluminum waste is ground and crushed and then pulverized by air jet mill to obtain aluminum waste powder with a particle size of 1-8μm;

[0035] (2) After melting the above aluminum waste powder at 700℃ for 15 minutes, remove the slag, and then filter it with a 30-mesh foam ceramic plate to obtain the first filtrate.

[0036] (3) Add 0.15% of Mn of the total mass of aluminum waste to the first filtrate, refine at 745℃ for 10 min, remove slag and then heat through a 30-mesh foam ceramic plate to obtain the second filtrate.

[0037] (4) After the second filtrate is transferred, it is further refined at a temperature of 690℃ for 20 minutes, and then kept warm and passed through a 30-mesh foam ceramic plate to obtain a molten liquid of recycled aluminum A.

[0038] 2. Preparation of recycled aluminum B:

[0039] (1) After melting aluminum scrap at 700℃ for 15 minutes, remove the slag and then filter it with a 30-mesh foam ceramic plate to obtain the first filtrate.

[0040] (2) Add 0.15% of the total mass of aluminum waste Mn to the first filtrate, refine at 745℃ for 10 min, remove slag and then heat through a 30-mesh foam ceramic plate to obtain the second filtrate.

[0041] (3) After the second filtrate is transferred, it is further refined at a temperature of 690℃ for 20 minutes, and then kept warm and passed through a 30-mesh foam ceramic plate to obtain a molten liquid of recycled aluminum B.

[0042] 3. Preparation of recycled aluminum C:

[0043] (1) The aluminum waste is ground and crushed and then pulverized by air jet mill to obtain aluminum waste powder with a particle size of 1-8μm;

[0044] (2) After melting the above aluminum waste powder at 700℃ for 15 minutes, remove the slag, and then filter it with a 30-mesh foam ceramic plate to obtain the first filtrate.

[0045] (3) Heat the first filtrate to 745℃ and continue refining for 10 minutes. Then remove the slag and keep it warm before passing it through a 30-mesh foam ceramic plate to obtain the second filtrate.

[0046] (4) After the second filtrate is transferred, it is further refined at a temperature of 690℃ for 20 minutes, and then kept warm and passed through a 30-mesh foam ceramic plate to obtain a molten liquid of recycled aluminum C.

[0047] 4. Preparation of recycled aluminum D:

[0048] (1) After melting aluminum scrap at 700℃ for 15 minutes, remove the slag and then filter it with a 30-mesh foam ceramic plate to obtain the first filtrate.

[0049] (2) Heat the first filtrate to 745℃ and continue refining for 10 minutes. Then remove the slag and keep it warm before passing it through a 30-mesh foam ceramic plate to obtain the second filtrate.

[0050] (3) After the second filtrate is transferred, it is further refined at a temperature of 690℃ for 20 minutes, and then kept warm and passed through a 30-mesh foam ceramic plate to obtain a molten liquid of recycled aluminum D.

[0051] The impurity composition of the above-mentioned recycled aluminum AD was analyzed, and the specific results are shown in Table 2 below:

[0052] Table 2

[0053]

[0054] As shown in Table 2 above, recycled aluminum A has the lowest impurity content, especially with a significant reduction in Fe content.

[0055] Example 2:

[0056] Preparation of aluminum-silicon master alloys from recycled aluminum:

[0057] (1) Material preparation: Prepare materials according to the following weight proportions:

[0058] 30 parts of recycled aluminum A molten liquid, 5 parts of pure aluminum ingots (purity ≥99.8%), 16 parts of pure silicon ingots (purity ≥99.9%), 15 parts of pure silicon powder (particle size 4-10μm, purity ≥99.9%), and 0.11 parts of pure magnesium ingots (purity ≥99.9%).

[0059] (2) Place the molten recycled aluminum A in a melting furnace under argon protection and adjust the temperature to 740℃ and keep it at that temperature. Maintain the argon atmosphere pressure in the range of 0.1-0.2MPa. Spray 1 / 3 of the pure silicon powder into the molten recycled aluminum A with the atmosphere. Then raise the temperature to 800℃, stir and mix, and let it stand for 25 minutes. Then spray 1 / 3 of the pure silicon powder into the molten recycled aluminum A with the atmosphere. Continue to raise the temperature to 880℃, stir and mix, and let it stand for 25 minutes. Then spray the remaining pure silicon powder into the molten recycled aluminum A with the atmosphere. Raise the temperature to 1480℃ and stir and melt for 20 minutes to obtain the molten liquid for later use.

[0060] (3) Lay pure aluminum ingots at the bottom of the refining furnace, lay pure silicon ingots on top of pure aluminum ingots, and add 0.3% of the total mass of pure silicon ingots of slag remover (potassium chloride, sodium chloride, calcium fluoride mass ratio 1:25:0.5) on top of pure silicon ingots. Then pour the molten liquid into the refining furnace under the protection of argon gas. After it is completely poured in, open the furnace under the protection of argon gas and heat it to 1480℃ and continue to melt for 13 minutes. Finally, add pure magnesium ingots and continue to melt for 20-25 minutes. Then remove the slag to obtain the mixed liquid.

[0061] (4) Add 0.2% of the total mass of pure silicon ingots of refining agent (potassium chloride, sodium chloride, and calcium nitrate in a mass ratio of 1:38:0.3) to the above mixture, adjust the temperature to refine at 850℃ for 12 min, at 1230℃ for 8 min, at 1450℃ for 18 min, and at 750℃ for 18 min, and remove the scum on the surface of the liquid after refining to obtain the refined liquid;

[0062] (5) Casting: The above-mentioned refining liquid is filtered through a 30-mesh foam ceramic plate and then cast. It is kept at 400℃ for 2.5h, and then cooled to room temperature at a cooling rate of 10-15℃ / min to obtain an aluminum-silicon intermediate alloy ingot.

[0063] Comparative Example 1:

[0064] Preparation of aluminum-silicon master alloys:

[0065] (1) Material preparation: Prepare materials according to the following weight proportions:

[0066] 35 parts of pure aluminum ingots (purity ≥99.8%), 16 parts of pure silicon ingots (purity ≥99.9%), 15 parts of pure silicon powder (particle size 4-10μm, purity ≥99.9%), and 0.11 parts of pure magnesium ingots (purity ≥99.9%).

[0067] (2) After melting 6 / 7 of the pure aluminum ingot, place it in a melting furnace under argon protection and adjust the temperature to 740℃ and keep it at that temperature. Maintain the argon atmosphere pressure range of 0.1-0.2MPa. Spray 1 / 3 of the pure silicon powder into the molten recycled aluminum A along with the atmosphere. Then raise the temperature to 800℃, stir and mix, and let it stand for 25 minutes. Then spray 1 / 3 of the pure silicon powder into the molten recycled aluminum A along with the atmosphere. Continue to raise the temperature to 880℃, stir and mix, and let it stand for 25 minutes. Then spray the remaining pure silicon powder into the molten recycled aluminum A along with the atmosphere. Raise the temperature to 1480℃, stir and melt for 20 minutes to obtain the molten liquid for later use.

[0068] (3) Lay pure aluminum ingots at the bottom of the refining furnace, lay pure silicon ingots on top of pure aluminum ingots, and add 0.3% of the total mass of pure silicon ingots of slag remover (potassium chloride, sodium chloride, calcium fluoride mass ratio 1:25:0.5) on top of pure silicon ingots. Then pour the molten liquid into the refining furnace under the protection of argon gas. After it is completely poured in, open the furnace under the protection of argon gas and heat it to 1480℃ and continue to melt for 13 minutes. Finally, add pure magnesium ingots and continue to melt for 20-25 minutes. Then remove the slag to obtain the mixed liquid.

[0069] (4) Add 0.2% of the total mass of pure silicon ingots of refining agent (potassium chloride, sodium chloride, and calcium nitrate in a mass ratio of 1:38:0.3) to the above mixture, adjust the temperature to refine at 850℃ for 12 min, at 1230℃ for 8 min, at 1450℃ for 18 min, and at 750℃ for 18 min, and remove the scum on the surface of the liquid after refining to obtain the refined liquid;

[0070] (5) Casting: The above-mentioned refining liquid is filtered through a 30-mesh foam ceramic plate and then cast. It is kept at 400℃ for 2.5h, and then cooled to room temperature at a cooling rate of 10-15℃ / min to obtain an aluminum-silicon intermediate alloy ingot.

[0071] Comparative Example 2:

[0072] Preparation of aluminum-silicon master alloys:

[0073] (1) Material preparation: Prepare materials according to the following weight proportions:

[0074] 30 parts of recycled aluminum A molten liquid, 5 parts of pure aluminum ingots (purity ≥99.8%), 31 parts of pure silicon ingots (purity ≥99.9%), and 0.11 parts of pure magnesium ingots (purity ≥99.9%);

[0075] (2) Place the molten recycled aluminum A in a melting furnace under argon protection and adjust the temperature to 740℃ and keep it at that temperature. Maintain the argon atmosphere pressure in the range of 0.1-0.2MPa. Add 1 / 2 of the pure silicon ingot to the molten recycled aluminum A, raise the temperature to 1480℃, stir and melt for 40 minutes to obtain the molten liquid for later use.

[0076] (3) Lay the pure aluminum ingots at the bottom of the refining furnace, lay the remaining pure silicon ingots on top of the pure aluminum ingots, and add 0.15% of the total mass of the pure silicon ingots of slag remover (potassium chloride, sodium chloride, calcium fluoride mass ratio 1:25:0.5) on top of the pure silicon ingots. Then pour the molten liquid into the refining furnace under the protection of argon gas. After it is completely poured in, open the furnace under the protection of argon gas and heat it to 1480℃ and continue to melt for 13 minutes. Finally, add the pure magnesium ingots and continue to melt for 20-25 minutes. Then remove the slag to obtain the mixed liquid.

[0077] (4) Add 0.1% of the total mass of pure silicon ingots of refining agent (potassium chloride, sodium chloride, and calcium nitrate in a mass ratio of 1:38:0.3) to the above mixture, adjust the temperature to refine at 850℃ for 12 min, at 1230℃ for 8 min, at 1450℃ for 18 min, and at 750℃ for 18 min, and remove the scum from the surface of the liquid after refining to obtain the refined liquid;

[0078] (5) Casting: The above-mentioned refining liquid is filtered through a 30-mesh foam ceramic plate and then cast. It is kept at 400℃ for 2.5h, and then cooled to room temperature at a cooling rate of 10-15℃ / min to obtain an aluminum-silicon intermediate alloy ingot.

[0079] Comparative Example 3:

[0080] Preparation of aluminum-silicon master alloys:

[0081] (1) Material preparation: Prepare materials according to the following weight proportions:

[0082] 30 parts of recycled aluminum A molten liquid, 5 parts of pure aluminum ingots (purity ≥99.8%), 16 parts of pure silicon ingots (purity ≥99.9%), 15 parts of pure silicon powder (particle size 4-10μm, purity ≥99.9%), and 0.11 parts of pure magnesium ingots (purity ≥99.9%).

[0083] (2) Place the molten recycled aluminum A in a melting furnace under argon protection and adjust the temperature to 740℃ and keep it at that temperature. Maintain the argon atmosphere pressure range of 0.1-0.2MPa. Spray pure silicon powder into the molten recycled aluminum A along with the atmosphere. Then raise the temperature to 1480℃ and stir and melt for 20 minutes to obtain the molten liquid for later use.

[0084] (3) Lay pure aluminum ingots at the bottom of the refining furnace, lay pure silicon ingots on top of pure aluminum ingots, and add 0.3% of the total mass of pure silicon ingots of slag remover (potassium chloride, sodium chloride, calcium fluoride mass ratio 1:25:0.5) on top of pure silicon ingots. Then pour the molten liquid into the refining furnace under the protection of argon gas. After it is completely poured in, open the furnace under the protection of argon gas and heat it to 1480℃ and continue to melt for 13 minutes. Finally, add pure magnesium ingots and continue to melt for 20-25 minutes. Then remove the slag to obtain the mixed liquid.

[0085] (4) Add 0.2% of the total mass of pure silicon ingots of refining agent (potassium chloride, sodium chloride, calcium nitrate mass ratio 1:38:0.3) to the above mixture, adjust the temperature to 1450℃ and refine for 25 min, then adjust the temperature to 750℃ and refine for 18 min, and remove the scum on the surface of the liquid after refining to obtain the refined liquid.

[0086] (5) Casting: The above-mentioned refining liquid is filtered through a 30-mesh foam ceramic plate and then cast. It is kept at 400℃ for 2.5h, and then cooled to room temperature at a cooling rate of 10-15℃ / min to obtain an aluminum-silicon intermediate alloy ingot.

[0087] Detection:

[0088] The aluminum-silicon master alloys prepared in Example 2 and Comparative Examples 1-3 were subjected to relevant performance tests. Tensile strength and elongation at break were tested according to the testing standard GB / T228-2002. The specific results are shown in Table 3 below:

[0089] Table 3

[0090] Group <![CDATA[Tensile strength (N / mm 2 )]]> Elongation at break (%) Example 2 <![CDATA[132N / mm 2 ]]> 37％ Comparative Example 1 <![CDATA[133N / mm 2 ]]> 37％ Comparative Example 2 <![CDATA[128N / mm 2 ]]> 32％ Comparative Example 3 <![CDATA[130N / mm 2 ]]> 35％

[0091] As can be seen from the table above, the addition of recycled aluminum in Example 2 has little impact on the performance of the final alloy compared to the pure aluminum in Comparative Example 1. Furthermore, the use of silicon powder as the silicon raw material and the production of the alloy under multi-stage temperature variations can effectively improve the performance of the final alloy.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A production process for preparing aluminum-silicon master alloys from recycled aluminum, characterized in that, The production process includes the following steps: S1. Aluminum scrap pretreatment: The aluminum scrap is crushed, then smelted, slag is removed, and then filtered. Mn is added to the filtrate, and after heat treatment and refining, slag is removed and the filtrate is filtered again. The filtrate is then transferred to another container for further refining and filtration to obtain recycled aluminum liquid for later use. The amount of Mn added is 0.12%-0.20% of the total aluminum scrap. S2. Material preparation: Prepare materials according to the following weight parts: 20-40 parts of recycled aluminum liquid, 4-6 parts of pure aluminum ingots, 12-20 parts of pure silicon ingots, 10-20 parts of pure silicon powder, and 0.1-0.12 parts of pure magnesium ingots. S3. Raw material pretreatment: Place the recycled aluminum liquid in a melting furnace and keep it at 700-800℃. Then, spray pure silicon powder into the recycled aluminum liquid in multiple batches with the atmosphere. After each addition of pure silicon powder, raise the temperature by 50-80℃, stir, and let it stand for 20-30 minutes. After all the pure silicon powder has been added, continue to raise the temperature to 1450-1500℃ for melting to obtain molten liquid for later use. S4. Secondary smelting: Pure aluminum ingots are laid at the bottom of the refining furnace, pure silicon ingots are laid on top of the pure aluminum ingots, and slag remover is added on top of the pure silicon ingots. The molten liquid is then poured into the refining furnace under the protection of argon gas. The furnace is opened and smelting continues for 10-15 minutes. Finally, pure magnesium ingots are added and smelting continues for 20-25 minutes. The slag is then removed to obtain a mixed liquid. S5. Refining: Add refining agent to the above mixture and refine it at 800-900℃, 1200-1250℃, 1450-1480℃ and 700-800℃ respectively. After refining, remove the scum from the surface of the liquid to obtain the refined liquid. S6. Casting and molding: After filtering the above-mentioned refining liquid, it is cast and kept at 400℃ for 2-3 hours, and then cooled to room temperature at a cooling rate of 10-15℃ / min to obtain aluminum-silicon intermediate alloy ingot.

2. The production process for preparing aluminum-silicon master alloy from recycled aluminum according to claim 1, characterized in that: In step S1, the aluminum waste is first ground and then milled using an air jet mill, resulting in fine powder with a particle size of 1-8 μm.

3. The production process for preparing aluminum-silicon master alloy from recycled aluminum according to claim 1, characterized in that: In step S1, the melting temperature is 700-720℃, the heat preservation and refining temperature is 740-750℃, the further refining temperature is 680-700℃, and a 30-mesh foam ceramic filter plate is used for filtration.

4. The production process for preparing aluminum-silicon master alloy from recycled aluminum according to claim 1, characterized in that: The particle size range of the pure silicon powder in step S2 is 4-10 μm.

5. The production process for preparing aluminum-silicon master alloy from recycled aluminum according to claim 1, characterized in that: The process in step S3 is carried out in a melting furnace under argon protection, with the argon pressure inside the melting furnace being 0.1-0.2 MPa.

6. The production process for preparing aluminum-silicon master alloy from recycled aluminum according to claim 1, characterized in that: In step S3, the time for heating to 1450-1500℃ and melting is 15-30 minutes.

7. The production process for preparing aluminum-silicon master alloy from recycled aluminum according to claim 1, characterized in that: In step S4, the slag remover is obtained by mixing potassium chloride, sodium chloride, and calcium fluoride in a mass ratio of 1:22-28:0.5, and the amount of slag remover added is 0.2%-0.4% of the total mass of pure silicon ingots.

8. The production process for preparing aluminum-silicon master alloy from recycled aluminum according to claim 1, characterized in that: In step S5, the refining agent is obtained by mixing potassium chloride, sodium chloride, and calcium nitrate in a mass ratio of 1:32-40:0.3, and the amount of refining agent added is 0.1%-0.3% of the total mass of pure silicon ingots.

9. The production process for preparing aluminum-silicon master alloy from recycled aluminum according to claim 1, characterized in that: In step S5, the refining time is 10-12 minutes at 800-900℃, 8-10 minutes at 1200-1250℃, 15-18 minutes at 1450-1480℃, and 15-20 minutes at 700-800℃.

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