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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Cast Shop Technology: Recycling and Sustainability Joint Session
Presentation Title Influence of Coating and De-coating on the Coalescence of Aluminium Drops in Salt
Author(s) Stefano Capuzzi, Anne Kvithyld, Giulio Timelli, Arne Nordmark, Thorvald Abel Engh
On-Site Speaker (Planned) Anne Kvithyld
Abstract Scope In a rotary furnace for aluminium recycling and dross treatment, a salt flux is added which protects against oxidation and captures non-metallic impurities. Furthermore, the salt has to promote the coalescence of the metal drops in the dross. This work investigates the coalescence of molten aluminium for different types of scrap. Hundred discs were stamped from aluminium alloy sheets with and without coating. They were melted, covered in NaCl-KCl-Na3AlF6 molten salt, in an induction furnace at 790C. The solidified aluminum droplets were extracted by leaching the salt with water. The fraction of coalesced drops and the average diameter were determined to evaluate the coalescence efficiency. The effect of various de-coating temperatures was studied. The results show that the coalescence is negatively affected by coating. Long holding times has no effect. Complete coalescence off all discs are achieved with uncoated scrap. The drops coalesce if the temperature of the combustion reaction for the coating is attained.
Proceedings Inclusion? Planned: Light Metals

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Centrifugal Casting of Al-Si Scrap
Dross Formation Mechanisms of Thermally Pre-treated Used Beverage Can Scrap Bales with Different Density
Improved Recyclability of Cast Al-alloys by Engineering β-Al9Fe2Si2 Phase
Influence of Coating and De-coating on the Coalescence of Aluminium Drops in Salt
The Scale-up of High Shear Processing for the Purification of Recycled Molten Scrap Aluminium Alloy: Key Features of Fluid Flow
Tramp Element Accumulation and Its Effects on Secondary Phase Particles

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