Method for regenerating copper-containing aluminum alloy from aluminum alloy scrap

Patent metadata

Field	Value
Publication number	US-11939644-B2
Application number	US-201917053971-A
Country	US
Kind code	B2
Filing date	Jul 25, 2019
Priority date	Jul 26, 2018
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

A method for regenerating different types of copper-containing aluminum alloys using aluminum alloy scrap from aeronautical industry includes detecting a chemical composition of said aluminum alloy scrap and optionally adding a suitable amount of a metal or alloy additive according to a composition requirement of a target aluminum-copper alloy, thereby obtaining a mixture of aluminum alloy scrap and metal or alloy additive; vacuum smelting the mixture of aluminum alloy scrap and metal or alloy additive in a vacuum furnace, wherein impurities are removed and an aluminum alloy solution is formed; filtering the aluminum alloy solution using a filter to obtain a melt comprising a target aluminum alloy composition; and casting the target aluminum alloy composition from said melt.

First claim

What is claimed is:

1. A method for regenerating different types of copper-containing aluminum alloys using aluminum alloy scrap, said method comprising:
detecting a chemical composition of said aluminum alloy scrap and adding a suitable amount of a metal or alloy additive according to a composition requirement of a target aluminum-copper alloy, thereby obtaining a mixture of aluminum alloy scrap and metal or alloy additive;
vacuum smelting the mixture of aluminum alloy scrap and metal or alloy additive in a vacuum furnace, wherein impurities are removed and an aluminum alloy solution is formed;
filtering the aluminum alloy solution using a filter to obtain a melt comprising a target aluminum alloy composition; and
casting the target aluminum alloy composition from said melt,
wherein the metal or alloy additive is added with the aluminum alloy scrap before the step of vacuum smelting the mixture of aluminum alloy scrap and metal or alloy additive.

2. The method according to claim 1 , wherein a content of the metal or alloy additive during detecting is determined by an actual composition of said aluminum alloy scrap.

3. The method according to claim 1 , wherein said metal or alloy additive is selected from one or more of the group consisting of a metallic copper, copper-manganese alloy, copper-silicon alloy, copper-iron alloy, copper-chromium alloy, and copper-magnesium alloy.

4. The method according to claim 1 , wherein said metal or alloy additive is present in the mixture in a non-zero amount up to about 8% based on the total weight of the aluminum alloy scrap.

5. The method according to claim 4 , wherein said metal or alloy additive is present in the mixture in a non-zero amount up to about 6% based on the total weight of the aluminum alloy scrap.

6. The method according to claim 1 , wherein during vacuum smelting, melt stirring is implemented by means of mechanical agitation, electromagnetic induction, or electromagnetic stirring.

7. The method according to claim 1 , wherein during vacuum smelting, a vacuum degree is controlled to 100 Pa or less to achieve distillation of impurity elements and removal of gas without additional de gasification.

8. The method according to claim 7 , wherein said vacuum degree is controlled to 30 Pa or less.

9. The method according to claim 1 , wherein during vacuum smelting, a smelting temperature is controlled in a range of 700 to 1300° C.

10. The method according to claim 9 , wherein said smelting temperature is controlled in a range of 800 to 1100° C.

11. The method according to claim 1 , wherein during vacuum smelting, a temperature holding time is 60 to 180 min.

12. The method according to claim 1 , wherein during vacuum smelting, zinc is removed.

13. The method according to claim 1 , wherein filtering is performed using a ceramic foam filter.

14. The method according to claim 1 , wherein during filtering, nonmetallic inclusions are removed from said melt.

15. The method according to claim 14 , wherein said nonmetallic inclusions are selected from the group consisting of magnesia, alumina, and silicon oxide.

16. The method according to claim 1 , wherein said casting is performed using a semi-continuous casting machine.

17. The method according to claim 1 , wherein after said casting, an ingot having fine crystal grains is formed.

18. The method according to claim 1 , wherein prior to detecting, the aluminum alloy scrap is stripped of any paint.

19. The method according to claim 1 , wherein during vacuum smelting, magnesium is removed.

20. A method for generating an aluminum-copper alloy using aluminum alloy scrap, said method comprising:
detecting a chemical composition of the aluminum alloy scrap and adding a suitable amount of copper or copper alloy according to a composition requirement of a target aluminum-copper alloy;
vacuum smelting the aluminum alloy scrap and the copper or copper alloy in a vacuum furnace, wherein at least one of zinc and magnesium is removed and an aluminum-copper alloy solution is formed;
filtering the aluminum-copper alloy solution using a filter to obtain an aluminum-copper alloy melt comprising the target aluminum-copper alloy; and
casting the target aluminum-copper alloy from said melt,
wherein the copper or copper alloy is added with the aluminum alloy scrap before the step of vacuum smelting the aluminum alloy scrap and the copper or copper alloy.

Assignees

• Boeing Co

Inventors

• Sun Zhi
• Liu Chunwei
• Wei Xuan
• Cao Hongbin
• Yan Pengcheng

Classifications

• C22B21/068 Primary

  handling in vacuum · CPC title

• C22B21/0007 Primary

  Preliminary treatment of ores or scrap or any other metal source (Bayer processes C01F) · CPC title

• C22B21/0092

  Remelting scrap, skimmings or any secondary source aluminium · CPC title

• C22B21/066

  Treatment of circulating aluminium, e.g. by filtration (C22B21/068 takes precedence) · CPC title

• C22C1/026 Primary

  Alloys based on aluminium · CPC title