Method for recovering processed aluminum scraps of aeronautical aluminum alloy

Patent metadata

Field	Value
Publication number	US-2024295007-A1
Application number	US-202218261728-A
Country	US
Kind code	A1
Filing date	Mar 4, 2022
Priority date	May 14, 2021
Publication date	Sep 5, 2024
Grant date	—

Abstract

A method includes performing pre-treating, comprising fire-roasting or wet-washing, on the processed aluminum scraps of aeronautical aluminum alloy. The method further includes performing pressing formation on the pre-treated processed aluminum scraps of aeronautical aluminum alloy to form block-shaped aluminum scraps. The method further includes performing oxygen-controlled smelting on the block-shaped aluminum scraps in a smelting furnace to form aluminum alloy melt. The method further includes performing casting on the aluminum alloy melt to obtain an aluminum alloy product of meeting component requirements of aeronautical aluminum alloy.

First claim

What is claimed is:

1 . A method for recovering processed aluminum scraps of aeronautical aluminum alloy, the method comprising:
performing pre-treating, comprising fire-roasting or wet-washing, on the processed aluminum scraps of aeronautical aluminum alloy; performing pressing formation on the processed aluminum scraps of aeronautical aluminum alloy to form block-shaped aluminum scraps; performing oxygen-controlled smelting on the block-shaped aluminum scraps in a smelting furnace to form aluminum alloy melt; and performing casting on the aluminum alloy melt to obtain an aluminum alloy product of meeting component requirements of aeronautical aluminum alloy.

2 . The method of claim 1 , further comprising performing oxygen-controlled refining the aluminum alloy melt after the oxygen-controlled smelting and before the casting.

3 . The method of claim 1 , wherein the processed aluminum scraps of aeronautical aluminum alloy comprise one or more of processed aluminum scraps of 2-series aluminum alloy and processed aluminum scraps of 7-series aluminum alloy.

4 . The method of claim 1 , wherein the fire-roasting is performed in air atmosphere, and a roasting temperature in the fire-roasting is 100-500° C.

5 . The method of claim 1 , wherein the wet-washing comprises washing and drying, washing liquid used in a washing process is one or more of industrial water, high purity water or ethyl alcohol, wherein the washing process is enhanced by using one or more of microwave vibration, ultrasonic vibration or mechanical stirring in the washing process, and

6 . The method of claim 5 , wherein a drying temperature used in a drying process is approximately 60° C. to approximately 150° C.

7 . The method of claim 1 , wherein a density of the block-shaped aluminum scraps formed after the pressing formation is 1.0-5.0 t/m3.

8 . The method of claim 1 , wherein in the oxygen-controlled smelting, vacuum or inert gas protection is used to control oxygen potential to an oxygen partial pressure in the oxygen-controlled smelting of not more than 0.001 Pa.

9 . The method of claim 1 , wherein the oxygen-controlled smelting comprises achieving rapid melting of the block-shaped aluminum scraps in an oxygen-controlled condition.

10 . The method of claim 9 , wherein the rapid melting of the block-shaped aluminum scraps is accelerated with electromagnetic stirring or gas blowing stirring in the oxygen-controlled smelting.

11 . The method of claim 1 , wherein smelting time is approximately 10 min to approximately 30 min.

12 . The method of claim 1 , wherein the smelting is performed at a smelting temperature of approximately 800° C. to approximately 1100° C. in an oxygen-controlled smelting condition.

13 . The method of claim 2 , wherein vacuum or inert gas protection is used to control oxygen potential in the oxygen-controlled refining.

14 . The method of claim 13 , wherein an oxygen partial pressure in the oxygen-controlled refining is controlled to not more than about 0.001 Pa.

15 . The method of claim 2 , wherein element reaction and diffusion process are accelerated with the help of electromagnetic stirring or gas blowing stirring in the oxygen-controlled refining.

16 . The method of claim 2 , comprising a refining time of approximately 10 min to approximately 30 min.

17 . The method of claim 2 , wherein the refining is performed at a refining temperature of about 800° C. to about 1100° C. in an oxygen-controlled refining condition.

18 . The method of claim 2 , wherein the oxygen-controlled refining comprises adding one or more of a metallic copper, a copper alloy, a metallic zinc, a zinc alloy and a magnesium alloy to the aluminum alloy melt to perform removal and alloying treatment of elements in the aluminum alloy melt,

19 . The method of claim 2 , wherein an oxygen partial pressure in the oxygen-controlled refining is up to 0.001 Pa.

20 . A method for recovering processed aluminum scraps of aeronautical aluminum alloy, the method comprising:
pre-treating the processed aluminum scraps of aeronautical aluminum alloy, the pre-treating comprising one or more of fire-roasting and wet-washing; pressing the pre-treated processed aluminum scraps of aeronautical aluminum alloy to form block-shaped aluminum scraps; oxygen-controlled smelting the block-shaped aluminum scraps in a smelting furnace to form aluminum alloy melt; and casting the aluminum alloy melt to obtain an aluminum alloy product.

Assignees

• Boeing Co

Inventors

• Wang Zhi
• Qian Guoyu
• Sun Zhi
• Liu Chunwei
• Cao Hongbin
• Yan Pengcheng

Classifications

• C22C21/18

  with zinc · CPC title

• C22C21/16

  with magnesium · CPC title

• C22C21/14

  with silicon · CPC title

• C22C1/03

  using master alloys · CPC title

• C22C1/026 Primary

  Alloys based on aluminium · CPC title