CN117025993A - Method for preparing high-strength aluminum alloy by using recycled aluminum - Google Patents

Method for preparing high-strength aluminum alloy by using recycled aluminum Download PDF

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CN117025993A
CN117025993A CN202311031940.2A CN202311031940A CN117025993A CN 117025993 A CN117025993 A CN 117025993A CN 202311031940 A CN202311031940 A CN 202311031940A CN 117025993 A CN117025993 A CN 117025993A
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aluminum
alloy
refining agent
regenerated
aluminum alloy
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郭世龙
王晓菲
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Anhui Baishengxin Metal Technology Co ltd
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Anhui Baishengxin Metal Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • C22B21/064—Obtaining aluminium refining using inert or reactive gases
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • C22B7/002—Dry processes by treating with halogens, sulfur or compounds thereof; by carburising, by treating with hydrogen (hydriding)
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/026—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses a method for preparing high-strength aluminum alloy by using reclaimed aluminum, which relates to the technical field of aluminum alloy processing, wherein the reclaimed aluminum is heated and melted, sn-Bi alloy is pressed into a melt, the mixture is stirred rapidly, inert gas and a refining agent are adopted to carry out degassing and impurity removal treatment on aluminum alloy liquid, slag skimming is carried out, and the mixture is left to stand and is discharged for casting; the invention improves the morphology of the iron-rich phase by adding a certain amount of Sn-Bi alloy into the regenerated aluminum melt, reduces the needle-shaped beta-Fe phase, and converts the beta-Fe phase into the alpha-Fe phase in a Chinese character shape or a skeleton shape, thereby improving the mechanical property of the aluminum alloy.

Description

Method for preparing high-strength aluminum alloy by using recycled aluminum
Technical field:
the invention relates to the technical field of aluminum alloy processing, in particular to a method for preparing high-strength aluminum alloy by using recycled aluminum.
The background technology is as follows:
the aluminum alloy is an alloy based on aluminum and added with a certain amount of other alloying elements, and belongs to one of light metal materials. In addition to the general properties of aluminum, aluminum alloys have specific properties of some alloys due to the variety and amount of alloying elements added. The density of the aluminum alloy is 2.63-2.85 g/cm 3 Has higher strength (sigma) b 110-650 MPa), the specific strength is close to that of high alloy steel, the specific rigidity is higher than that of steel, and the high alloy steel has good castability and electric conductionThe material has the advantages of good performance, heat conductivity, corrosion resistance and weldability, can be used as a structural material, and has wide application in the fields of aerospace, aviation, transportation, construction, electromechanics, lightening, daily necessities and the like.
The regenerated aluminum is also called as secondary aluminum, and is aluminum obtained by smelting waste aluminum pieces and waste aluminum materials. Aluminum is a recyclable resource, and currently, recycled aluminum accounts for more than 1/3 of the annual output of the world's original aluminum. The performance of the regenerated aluminum is the same as that of the original aluminum, and the regenerated aluminum is mainly used for producing cast aluminum alloy and aluminum iron at present. The cast aluminum alloy is applied to the fields of automobile manufacture, aerospace, electronic products and construction, and aluminum iron is used as a deoxidizer and a desulfurizing agent for steelmaking. The production of the secondary aluminum not only reduces the requirement on limited resources, but also reduces the consumption of energy and environmental pollution. However, in the process of producing high-performance aluminum alloy by using the reclaimed aluminum, the reclaimed aluminum is limited by the complex components of waste aluminum raw materials, so that the hardness, strength and toughness of the processed aluminum alloy are insufficient, and the aluminum alloy is easy to deform and even break in the use process, thereby seriously affecting the service life of the aluminum alloy.
The invention comprises the following steps:
the alpha-Fe phase and beta-Fe phase are the two most common iron phases in aluminum alloys. The research shows that the alpha-Fe phase exists in Chinese character shape or skeleton shape and other forms, and the harmful effect on the aluminum matrix is not obvious; however, the beta-Fe phase is in a thick needle shape and is uneven in deformation, so that relatively high stress concentration exists at the junction of the iron phase and the aluminum matrix, and the mechanical property of the aluminum alloy is obviously reduced. In addition, the existence of iron impurities can damage the continuity of the aluminum oxide film on the aluminum surface, small anodes and large cathodes are formed on the aluminum alloy surface, the corrosion resistance of the aluminum alloy is reduced, and the surface quality of the aluminum alloy after anodic oxidation is deteriorated.
In order to solve the problems, the technical problem to be solved by the invention is to provide a method for preparing high-strength aluminum alloy by using recycled aluminum, which not only can promote the recycling of waste aluminum, but also has excellent application effect.
The technical problems to be solved by the invention are realized by adopting the following technical scheme:
the first object of the invention is to provide a method for preparing high-strength aluminum alloy by using reclaimed aluminum, which comprises the steps of heating and melting the reclaimed aluminum, pressing Sn-Bi alloy into a melt, rapidly stirring, degassing and impurity removing the aluminum alloy liquid by adopting inert gas and a refining agent, removing slag, standing, and discharging and casting.
Preferably, the regenerated aluminum is a regenerated aluminum-silicon alloy, and the silicon content is 5-15 wt%.
Preferably, the heat melting of the secondary aluminum is 750-850 ℃. The temperature can be raised in stages or once.
Preferably, the Sn-Bi alloy is added in an amount of 0.05 to 0.5wt% based on the amount of the secondary aluminum. When the Sn-Bi alloy is added in an amount of less than 0.05wt%, it cannot achieve a remarkable effect; when the addition amount of the Sn-Bi alloy is more than 0.5wt%, the processing cost is greatly increased.
Preferably, the content of Bi in the Sn-Bi alloy is 5 to 10wt%. The effect of adding Sn-Bi alloy to secondary aluminum is far better than adding equal amount of Sn or Bi.
Preferably, the inert gas is one or a mixture of argon and nitrogen. Argon or nitrogen may be used, or a mixed gas of argon and nitrogen may be used.
Preferably, the refining agent is a mixture of KCl, mgCl, K 3 AlF 6 And CaF 2 Composition, KCl, mgCl, K 3 AlF 6 And CaF 2 The mass ratio of (5-15) to (5-15) is (40-50) to (25-35).
Preferably, the refining agent is a mixture of KCl, mgCl, K 3 AlF 6 And Zn 3 N 2 Composition, KCl, mgCl, K 3 AlF 6 And Zn 3 N 2 The mass ratio of (5-15) to (5-15) is (40-50) to (25-35).
The invention adopts the two refining agents, and the second refining agent is prepared by Zn 3 N 2 The addition of (3) can achieve an unexpected technical effect that is a synergistic effect with the aforementioned Sn-Bi alloy.
Preferably, the addition amount of the refining agent is 0.2 to 0.5 weight percent of the use amount of the secondary aluminum. The amount of the refining agent is controlled according to the impurity content of the raw material secondary aluminum, i.e., the amount of the refining agent may not be limited to the range value.
Preferably, the rest time is not less than 30min. And (3) floating the gas and slag which are not scraped in the aluminum alloy liquid by standing, and filtering out slag in the casting process.
A second object of the present invention is to provide a high strength aluminum alloy obtained by the aforementioned method.
The beneficial effects of the invention are as follows:
(1) The invention improves the morphology of the iron-rich phase by adding a certain amount of Sn-Bi alloy into the regenerated aluminum melt, reduces the needle-shaped beta-Fe phase, and converts the beta-Fe phase into the alpha-Fe phase in a Chinese character shape or a skeleton shape, thereby improving the mechanical property of the aluminum alloy.
(2) The refining agent adopted by the invention can remove hydrogen and floating oxidation slag in the aluminum alloy liquid to make the aluminum alloy liquid purer, and can pass Zn in the refining agent 3 N 2 The proper amount of the beta-Fe phase in the aluminum alloy is reduced, the size is reduced, and the harmful effect of impurity iron in the aluminum alloy is further reduced.
The specific embodiment is as follows:
the invention is further described in connection with the following embodiments in order to make the technical means, the creation features, the achievement of the purpose and the effect of the invention easy to understand.
The raw material regenerated aluminum in the following examples and comparative examples is processed by the same regeneration process from the same batch of scrap aluminum.
Example 1
Firstly heating the regenerated aluminum to 800 ℃ for melting, then pressing Sn-Bi alloy into the melt, wherein the addition amount of the Sn-Bi alloy is 0.3wt% of the use amount of the regenerated aluminum, the content of Bi in the Sn-Bi alloy is 8wt%, stirring for 15min at 300r/min, then adopting argon and a refining agent to carry out degassing and impurity removal treatment on the aluminum alloy liquid, wherein the use amount of the refining agent is 0.35wt% of the use amount of the regenerated aluminum, slagging off, standing for 30min, and discharging and casting.
Wherein the refining agent is prepared from KCl,MgCl、K 3 AlF 6 And CaF 2 Composition, KCl, mgCl, K 3 AlF 6 And CaF 2 The mass ratio of (2) is 40:30:10:5.
Example 2
Firstly heating regenerated aluminum to 850 ℃ for melting, then pressing Sn-Bi alloy into the melt, wherein the addition amount of the Sn-Bi alloy is 0.2wt% of the use amount of the regenerated aluminum, the content of Bi in the Sn-Bi alloy is 10wt%, stirring for 15min at 300r/min, then adopting nitrogen and a refining agent to carry out degassing and impurity removal treatment on the aluminum alloy liquid, wherein the use amount of the refining agent is 0.4wt% of the use amount of the regenerated aluminum, slagging off, standing for 60min, and discharging and casting.
Wherein the refining agent is prepared from KCl, mgCl, K 3 AlF 6 And CaF 2 Composition, KCl, mgCl, K 3 AlF 6 And CaF 2 The mass ratio of (2) is 45:25:10:5.
Example 3
Firstly heating the regenerated aluminum to 750 ℃ for melting, then pressing Sn-Bi alloy into the melt, wherein the addition amount of the Sn-Bi alloy is 0.25wt% of the use amount of the regenerated aluminum, the content of Bi in the Sn-Bi alloy is 5wt%, stirring for 15min at 300r/min, then adopting nitrogen and a refining agent to carry out degassing and impurity removal treatment on the aluminum alloy liquid, wherein the use amount of the refining agent is 0.5wt% of the use amount of the regenerated aluminum, slagging off, standing for 30min, and discharging and casting.
Wherein the refining agent is prepared from KCl, mgCl, K 3 AlF 6 And CaF 2 Composition, KCl, mgCl, K 3 AlF 6 And CaF 2 The mass ratio of (2) is 45:35:12:10.
Example 4
Firstly heating the regenerated aluminum to 750 ℃ for melting, then pressing Sn-Bi alloy into the melt, wherein the addition amount of the Sn-Bi alloy is 0.15wt% of the use amount of the regenerated aluminum, the content of Bi in the Sn-Bi alloy is 10wt%, stirring for 15min at 300r/min, then adopting argon and a refining agent to carry out degassing and impurity removal treatment on the aluminum alloy liquid, wherein the use amount of the refining agent is 0.5wt% of the use amount of the regenerated aluminum, slagging off, standing for 45min, and discharging and casting.
Wherein the refining agent is prepared from KCl, mgCl, K 3 AlF 6 And CaF 2 Composition, KCl, mgCl, K 3 AlF 6 And CaF 2 The mass ratio of (2) is 50:25:10:10.
Example 5
Firstly heating the regenerated aluminum to 800 ℃ for melting, then pressing Sn-Bi alloy into the melt, wherein the addition amount of the Sn-Bi alloy is 0.3wt% of the use amount of the regenerated aluminum, the content of Bi in the Sn-Bi alloy is 8wt%, stirring for 15min at 300r/min, then adopting inert gas (argon and nitrogen with the volume ratio of 9:1) and a refining agent to carry out degassing and impurity removal treatment on the aluminum alloy liquid, wherein the use amount of the refining agent is 0.3wt% of the use amount of the regenerated aluminum, standing for 60min after slag skimming, and discharging and casting.
Wherein the refining agent is prepared from KCl, mgCl, K 3 AlF 6 And CaF 2 Composition, KCl, mgCl, K 3 AlF 6 And CaF 2 The mass ratio of (2) is 50:30:10:8.
Example 6
CaF in the refining agent used in example 1 2 Replacement with Zn of the same mass 3 N 2 Example 6 was obtained.
Firstly heating the regenerated aluminum to 800 ℃ for melting, then pressing Sn-Bi alloy into the melt, wherein the addition amount of the Sn-Bi alloy is 0.3wt% of the use amount of the regenerated aluminum, the content of Bi in the Sn-Bi alloy is 8wt%, stirring for 15min at 300r/min, then adopting argon and a refining agent to carry out degassing and impurity removal treatment on the aluminum alloy liquid, wherein the use amount of the refining agent is 0.35wt% of the use amount of the regenerated aluminum, slagging off, standing for 30min, and discharging and casting.
Wherein the refining agent is prepared from KCl, mgCl, K 3 AlF 6 And Zn 3 N 2 Composition, KCl, mgCl, K 3 AlF 6 And Zn 3 N 2 The mass ratio of (2) is 40:30:10:5.
Example 7
CaF in the refining agent used in example 5 2 Replacement with Zn of the same mass 3 N 2 Example 7 was obtained.
Firstly heating the regenerated aluminum to 800 ℃ for melting, then pressing Sn-Bi alloy into the melt, wherein the addition amount of the Sn-Bi alloy is 0.3wt% of the use amount of the regenerated aluminum, the content of Bi in the Sn-Bi alloy is 8wt%, stirring for 15min at 300r/min, then adopting inert gas (argon and nitrogen with the volume ratio of 9:1) and a refining agent to carry out degassing and impurity removal treatment on the aluminum alloy liquid, wherein the use amount of the refining agent is 0.3wt% of the use amount of the regenerated aluminum, standing for 60min after slag skimming, and discharging and casting.
Wherein the refining agent is prepared from KCl, mgCl, K 3 AlF 6 And Zn 3 N 2 Composition, KCl, mgCl, K 3 AlF 6 And Zn 3 N 2 The mass ratio of (2) is 50:30:10:8.
Comparative example 1
Comparative example 1 was obtained by substituting the Sn-Bi alloy used in example 1 with Al-Bi alloy.
Heating the regenerated aluminum to 800 ℃ to melt, pressing Al-Bi alloy into the melt, wherein the addition amount of the Al-Bi alloy is 0.3wt% of the use amount of the regenerated aluminum, the content of Bi in the Al-Bi alloy is 8wt%, stirring for 15min at 300r/min, then adopting argon and a refining agent to carry out degassing and impurity removal treatment on the aluminum alloy liquid, wherein the use amount of the refining agent is 0.35wt% of the use amount of the regenerated aluminum, slagging off, standing for 30min, and discharging and casting.
Wherein the refining agent is prepared from KCl, mgCl, K 3 AlF 6 And CaF 2 Composition, KCl, mgCl, K 3 AlF 6 And CaF 2 The mass ratio of (2) is 40:30:10:5.
Comparative example 2
Comparative example 2 was obtained by substituting the Sn-Bi alloy used in example 1 with Al-Sn alloy.
Heating the regenerated aluminum to 800 ℃ to melt, pressing Al-Sn alloy into the melt, wherein the addition amount of the Al-Sn alloy is 0.3wt% of the use amount of the regenerated aluminum, the content of Sn in the Al-Sn alloy is 92wt%, stirring for 15min at 300r/min, then carrying out degassing and impurity removal treatment on the aluminum alloy liquid by adopting argon and a refining agent, wherein the use amount of the refining agent is 0.35wt% of the use amount of the regenerated aluminum, slagging off, standing for 30min, and discharging and casting.
Wherein the refining agent is prepared from KCl, mgCl, K 3 AlF 6 And CaF 2 Composition, KCl, mgCl, K 3 AlF 6 And CaF 2 The mass ratio of (2) is 40:30:10:5.
Comparative example 3
Comparative example 3 was obtained by substituting Sn powder for the Sn-Bi alloy used in example 1.
Firstly heating the regenerated aluminum to 800 ℃ for melting, then pressing Sn powder into the melt, wherein the adding amount of the Sn powder is 0.3wt% of the using amount of the regenerated aluminum, stirring for 15min at 300r/min, then carrying out degassing and impurity removal treatment on the aluminum alloy liquid by adopting argon and a refining agent, wherein the using amount of the refining agent is 0.35wt% of the using amount of the regenerated aluminum, and standing for 30min after slag skimming, and discharging and casting.
Wherein the refining agent is prepared from KCl, mgCl, K 3 AlF 6 And CaF 2 Composition, KCl, mgCl, K 3 AlF 6 And CaF 2 The mass ratio of (2) is 40:30:10:5.
Comparative example 4
Comparative example 4 was obtained by substituting Bi powder for the Sn-Bi alloy used in example 1.
Firstly heating the regenerated aluminum to 800 ℃ for melting, then pressing Bi powder into the melt, wherein the addition amount of the Bi powder is 0.3wt% of the use amount of the regenerated aluminum, stirring for 15min at 300r/min, then carrying out degassing and impurity removal treatment on the aluminum alloy liquid by adopting argon and a refining agent, wherein the use amount of the refining agent is 0.35wt% of the use amount of the regenerated aluminum, standing for 30min after slag skimming, and discharging and casting.
Wherein the refining agent is prepared from KCl, mgCl, K 3 AlF 6 And CaF 2 Composition, KCl, mgCl, K 3 AlF 6 And CaF 2 The mass ratio of (2) is 40:30:10:5.
Comparative example 5
Zn in the refining agent used in example 7 3 N 2 Replacement by ZnCl 2 Comparative example 5 was obtained.
Firstly heating the regenerated aluminum to 800 ℃ for melting, then pressing Sn-Bi alloy into the melt, wherein the addition amount of the Sn-Bi alloy is 0.3wt% of the use amount of the regenerated aluminum, the content of Bi in the Sn-Bi alloy is 8wt%, stirring for 15min at 300r/min, then adopting inert gas (argon and nitrogen with the volume ratio of 9:1) and a refining agent to carry out degassing and impurity removal treatment on the aluminum alloy liquid, wherein the use amount of the refining agent is 0.3wt% of the use amount of the regenerated aluminum, standing for 60min after slag skimming, and discharging and casting.
Wherein the refining agent is prepared from KCl, mgCl, K 3 AlF 6 And ZnCl 2 Composition, KCl、MgCl、K 3 AlF 6 And ZnCl 2 The mass ratio of (2) is 50:30:10:8.
The aluminum alloy solutions prepared in the above examples 1 to 7 and comparative examples 1 to 5 were discharged and cast to obtain aluminum alloy castings, the aluminum alloy castings were placed in a hot air circulation solution furnace, subjected to solution treatment at 550 ℃ for 8 hours, then rapidly placed in 75 ℃ for quenching treatment in water for 10 minutes, then placed in a hot air circulation aging furnace, subjected to aging treatment at 180 ℃ for 5 hours, and air-cooled to room temperature to obtain aluminum alloy materials. Cutting an aluminum alloy material to prepare a sample with the same shape and size, and adopting a CMT5105 electronic universal tester and carrying out a tensile test on a metal material according to the standard GB/T228.1-2021 part 1: room temperature test methods tensile strength and yield strength were measured on the test pieces and the test results are shown in table 1.
The larger the tensile strength value, the stronger the fracture resistance of the aluminum alloy material.
The larger the value of the yield strength, the stronger the aluminum alloy material's ability to resist plastic deformation.
Table 1 tensile and yield strengths of aluminum alloy materials
Tensile strength/MPa Yield strength/MPa
Example 1 348 240
Example 2 334 229
Example 3 320 218
Example 4 329 223
Example 5 342 238
Example 6 357 252
Example 7 351 245
Comparative example 1 320 213
Comparative example 2 330 226
Comparative example 3 309 197
Comparative example 4 294 182
Comparative example 5 340 235
As can be seen from the data in Table 1, the addition of Sn-Bi alloy during the smelting of secondary aluminum and Zn in refining agent 3 N 2 The addition of (3) can substantially improve the tensile strength and the yield strength of the prepared aluminum alloy material.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A method for preparing high-strength aluminum alloy by using recycled aluminum is characterized by comprising the following steps: firstly heating and melting the regenerated aluminum, then pressing Sn-Bi alloy into the melt, rapidly stirring, then carrying out degassing and impurity removal treatment on the aluminum alloy liquid by adopting inert gas and a refining agent, removing slag, standing, and discharging and casting.
2. The method according to claim 1, characterized in that: the regenerated aluminum is regenerated aluminum-silicon alloy, and the silicon content is 5-10wt%.
3. The method according to claim 1, characterized in that: the heating and melting of the regenerated aluminum is 750-850 ℃.
4. The method according to claim 1, characterized in that: the addition amount of the Sn-Bi alloy is 0.05 to 0.5 weight percent of the use amount of the secondary aluminum.
5. The method according to claim 1, characterized in that: the content of Bi in the Sn-Bi alloy is 5 to 10wt%.
6. The method according to claim 1, characterized in that: the inert gas is one or two of argon and nitrogen.
7. The method according to claim 1, characterized in that: the refining agent is prepared from KCl, mgCl, K 3 AlF 6 And CaF 2 Composition, KCl, mgCl, K 3 AlF 6 And CaF 2 The mass ratio of (5-15) to (5-15) is (40-50) to (25-35).
8. The method according to claim 1, characterized in that: the adding amount of the refining agent is 0.2-0.5 wt% of the using amount of the regenerated aluminum.
9. The method according to claim 1, characterized in that: the standing time is not less than 30min.
10. A high strength aluminum alloy obtained by the method of any one of claims 1 to 9.
CN202311031940.2A 2023-08-16 2023-08-16 Method for preparing high-strength aluminum alloy by using recycled aluminum Pending CN117025993A (en)

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