Sustainable recycling of aerospace-grade ultra-clean 7050 aluminum alloy melts through argon refining without secondary aluminum dross generation
The refining of aluminum scraps commonly employs nitrogen-fluxes to eliminate impurities. However, the aluminum nitride (AlN) generated by the reaction between nitrogen and the aluminum melt, along with residual fluxes, contribute to low cleanliness of the recycled aluminum melt and pose difficultie...
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| Format: | Article |
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Elsevier
2023-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423024742 |
| _version_ | 1827346166795206656 |
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| author | Sen Du Shengen Zhang Jianwen Wang Zhengfeng Lv Zhiyuan Xu Chen Liu Jun Liu Bo Liu |
| author_facet | Sen Du Shengen Zhang Jianwen Wang Zhengfeng Lv Zhiyuan Xu Chen Liu Jun Liu Bo Liu |
| author_sort | Sen Du |
| collection | DOAJ |
| description | The refining of aluminum scraps commonly employs nitrogen-fluxes to eliminate impurities. However, the aluminum nitride (AlN) generated by the reaction between nitrogen and the aluminum melt, along with residual fluxes, contribute to low cleanliness of the recycled aluminum melt and pose difficulties for the disposal of secondary aluminum dross (SAD). Our innovative research has resulted in the recycling of aerospace-grade clean aluminum alloy melts. The results indicate that the argon bubble floating process adsorbs inclusions and hydrogen, achieving an aerospace-grade ultra-clean melt. The solid-liquid interface between the tube wall and the melt provides a diffusion channel for hydrogen atoms, and the bubbles rising up along the wall lead to a higher hydrogen content in the melt. The argon refining dross is primarily composed of Al and Al2O3, which can be recycled as a raw material for aluminum electrolysis. Argon refining can decrease the hydrogen content and the number of inclusions with particle size ≥40 μm in the recycled aluminum melt to the level of aerospace aluminum alloy melt. Nonetheless, the particle size ≥20 μm remains 1.5–2.5 times that of primary aluminum. |
| first_indexed | 2024-03-07T23:24:10Z |
| format | Article |
| id | doaj.art-c6cc6b29930c47dab641ec4c5d3d7640 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-07T23:24:10Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-c6cc6b29930c47dab641ec4c5d3d76402024-02-21T05:25:48ZengElsevierJournal of Materials Research and Technology2238-78542023-11-012721022116Sustainable recycling of aerospace-grade ultra-clean 7050 aluminum alloy melts through argon refining without secondary aluminum dross generationSen Du0Shengen Zhang1Jianwen Wang2Zhengfeng Lv3Zhiyuan Xu4Chen Liu5Jun Liu6Bo Liu7Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; Corresponding author.Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, ChinaShandong Nanshan Aluminum Co., Ltd., Longkou City, Shandong 265713, ChinaShandong Nanshan Aluminum Co., Ltd., Longkou City, Shandong 265713, ChinaShandong Nanshan Aluminum Co., Ltd., Longkou City, Shandong 265713, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; Delta Aluminium Industry Co., Ltd., Zhaoqing, Guangzhou 526200, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; Xinjiang Research Institute for Nonferrous Metals, Urumqi 830009, China; Corresponding author. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.The refining of aluminum scraps commonly employs nitrogen-fluxes to eliminate impurities. However, the aluminum nitride (AlN) generated by the reaction between nitrogen and the aluminum melt, along with residual fluxes, contribute to low cleanliness of the recycled aluminum melt and pose difficulties for the disposal of secondary aluminum dross (SAD). Our innovative research has resulted in the recycling of aerospace-grade clean aluminum alloy melts. The results indicate that the argon bubble floating process adsorbs inclusions and hydrogen, achieving an aerospace-grade ultra-clean melt. The solid-liquid interface between the tube wall and the melt provides a diffusion channel for hydrogen atoms, and the bubbles rising up along the wall lead to a higher hydrogen content in the melt. The argon refining dross is primarily composed of Al and Al2O3, which can be recycled as a raw material for aluminum electrolysis. Argon refining can decrease the hydrogen content and the number of inclusions with particle size ≥40 μm in the recycled aluminum melt to the level of aerospace aluminum alloy melt. Nonetheless, the particle size ≥20 μm remains 1.5–2.5 times that of primary aluminum.http://www.sciencedirect.com/science/article/pii/S2238785423024742Argon refiningRecycled aluminum meltSecondary aluminum dross (SAD)Ultra-clean aerospace-grade aluminum melt |
| spellingShingle | Sen Du Shengen Zhang Jianwen Wang Zhengfeng Lv Zhiyuan Xu Chen Liu Jun Liu Bo Liu Sustainable recycling of aerospace-grade ultra-clean 7050 aluminum alloy melts through argon refining without secondary aluminum dross generation Journal of Materials Research and Technology Argon refining Recycled aluminum melt Secondary aluminum dross (SAD) Ultra-clean aerospace-grade aluminum melt |
| title | Sustainable recycling of aerospace-grade ultra-clean 7050 aluminum alloy melts through argon refining without secondary aluminum dross generation |
| title_full | Sustainable recycling of aerospace-grade ultra-clean 7050 aluminum alloy melts through argon refining without secondary aluminum dross generation |
| title_fullStr | Sustainable recycling of aerospace-grade ultra-clean 7050 aluminum alloy melts through argon refining without secondary aluminum dross generation |
| title_full_unstemmed | Sustainable recycling of aerospace-grade ultra-clean 7050 aluminum alloy melts through argon refining without secondary aluminum dross generation |
| title_short | Sustainable recycling of aerospace-grade ultra-clean 7050 aluminum alloy melts through argon refining without secondary aluminum dross generation |
| title_sort | sustainable recycling of aerospace grade ultra clean 7050 aluminum alloy melts through argon refining without secondary aluminum dross generation |
| topic | Argon refining Recycled aluminum melt Secondary aluminum dross (SAD) Ultra-clean aerospace-grade aluminum melt |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423024742 |
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