ISSN:1000-8365 CN:61-1134/TG
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Research on the Process of Sedimentation Add Filtration to Remove FeImpurities from Recycled Aluminium Cans
Author of the article:CUI Junhao1,2, XIAO Yong1,2, WANG Xiangjie1,2, CUI Jianzhong1,2, LI Lei1,2
Author's Workplace:1. Key Laboratory for Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang110819, China; 2. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Key Words:recycled aluminium cans; sedimentation+filtration; Fe-rich phase; iron removal rate
Abstract:
Recycling and reusing scrap aluminium can greatly save energy. However, for a variety of reasons, the impurityFe is often mixed during recovery, which greatly deteriorates the mechanical properties of aluminium alloys. Therefore,developing an effective Fe removal technology for recycled aluminium is highly important for promoting the developmentof the scrap aluminium recycling industry. In this study, recycled aluminium cans with an Fe content of 1.4 wt.% weretaken as the research object. By adding Mn and Si, a coarse All5(Fe, Mn)3Si2 phase was formed in the melt, and then, Feremoval was investigated via a sedimentation+filtration process. The results show that the best Fe removal effect is obtainedby adding 2.98 wt.% Mn and 7.89 wt.% Si to the aluminium melt and then filtering after being kept at 630 ℃ for 15 min.The Fe removal rates by sedimentation and filtration can reach 64.5% and 68.8% , respectively. Microstructure analysisreveals that sedimentation removes a large amount of the dendritic All5(Fe, Mn)3Si phase segregated at the bottom of thecrucible, and filtration removes a small amount of the block-like All5(Fe, Mn)3Si phase in the upper part of the melt. Afterthe upper melt is filtered, a certain amount of the block-like All5(Fe, Mn)3Si phase remains in the ceramic filter, whereas asmall amount of the fishbone-shaped All5(Fe, Mn)3Si phase is contained in the melt.