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As aluminiumAluminium (Al) recyclingRecycling increases, the compositionRefining aluminium of minor elements in recycled Al fluctuates significantly. Trace elements in Al alloysAl alloy can lead to serious defects; for example, the combination of copperCopper (Cu) and zinc (Zn) can cause corrosion issues, even when the alloys produced from recycled scrap meet specifications. However, removing tramp elements from Al scrap remains a challenge. This study aims to eliminate impurity elementsImpurity elements from Al by exploiting the high vapor pressureVapor pressure of those elements compared to molten Al. Laboratory experiments demonstrate that 11% of Zn can be completely removed by holding the material for 30 min at 800 °C or 120 min at 700 °C under a 0.1 mbar vacuum. The kineticsKinetics and thermodynamics of vacuum refiningVacuum refining is also discussed.

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Removal of Zn and Other Volatile Elements from Molten Al by Vacuum Refining

  • 会议论文

  • 发表日期：

    2025年

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  • Sarina Bao,
  • Martin Syvertsen,
  • Anne Kvithyld,
  • Kai Tang,
  • Zala Qazi,
  • Signe Ljungquist,
  • Sunniva Walle

摘要

As aluminiumAluminium (Al) recyclingRecycling increases, the compositionRefining aluminium of minor elements in recycled Al fluctuates significantly. Trace elements in Al alloysAl alloy can lead to serious defects; for example, the combination of copperCopper (Cu) and zinc (Zn) can cause corrosion issues, even when the alloys produced from recycled scrap meet specifications. However, removing tramp elements from Al scrap remains a challenge. This study aims to eliminate impurity elementsImpurity elements from Al by exploiting the high vapor pressureVapor pressure of those elements compared to molten Al. Laboratory experiments demonstrate that 11% of Zn can be completely removed by holding the material for 30 min at 800 °C or 120 min at 700 °C under a 0.1 mbar vacuum. The kineticsKinetics and thermodynamics of vacuum refiningVacuum refining is also discussed.