About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Melt Processing, Casting and Recycling
|
Presentation Title |
Removal of Zn and other tramp elements from molten Al by vacuum refining |
Author(s) |
Sarina Bao, Martin Syvertsen, Anne Kvithyld, Kai Tang |
On-Site Speaker (Planned) |
Sarina Bao |
Abstract Scope |
With increasing of aluminium (Al) waste recycling, the minor element composition in recycled Al fluctuates considerably in chemistry. Trace elements in Al alloys can cause serious problems. As an example, Zn contamination can cause problems even if the alloy produced with recycled scrap are according to specifications. However, it is challenging to remove tramp elements from Al scrap. The main goal in this work is to remove impurity elements from Al by utilising the high vapour pressure of these elements above molten Al, and utilisation of both the metal and the condensed impurities. Lab experiments show that 11% Zn can be 100% removed holding 15min at 900 °C in 0.1mbar vacuum. Kinetics and thermodynamics of vacuum refining will also be discussed. |
Proceedings Inclusion? |
Planned: Light Metals |
Keywords |
Aluminum, Pyrometallurgy, Recycling and Secondary Recovery |