Light Metals 2017 pp 1105-1113

Part of the The Minerals, Metals & Materials Series book series (MMMS) | Cite as

Dross Formation Mechanisms of Thermally Pre-Treated Used Beverage Can Scrap Bales with Different Density

  • J. Steglich
  • R. Dittrich
  • G. Rombach
  • M. Rosefort
  • B. Friedrich
  • A. Pichat
Chapter

Abstract

Used beverage can scrap (UBC) bales can be remelted in state of the art multi-chamber furnaces. Following the recycling of baled UBC scrap in multi-chamber furnaces, a laboratory scale process route was developed for thermal pre-treatment and submerged melting of the scrap. In the present work, UBC scrap types with different densities and level of contamination are compared. The scrap types were thermally pre-treated in different atmospheres up to 823 K (550 °C) and subsequently melted by submerging in a salt-free laboratory process. Melting was performed in pure aluminum at 1023 K (750 °C) under protective argon atmosphere to exclude the influence of thermolysis gases and atmosphere. The impact of remaining organic contamination and oxidation products after thermal pre-treatment on dross formation were described. Results of SEM EDX analysis, as well as thermochemical calculations, were used to explain reactions between solid scrap and the liquid aluminium melt to improve recycling efficiency.

Keywords

Dross formation UBC Thermal pre-treatment Submerged melting 

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Copyright information

© The Minerals, Metals & Materials Society 2017

Authors and Affiliations

  • J. Steglich
    • 1
  • R. Dittrich
    • 2
  • G. Rombach
    • 3
  • M. Rosefort
    • 1
  • B. Friedrich
    • 2
  • A. Pichat
    • 4
  1. 1.TRIMET Aluminium SEEssenGermany
  2. 2.IME Process Metallurgy and Metal RecyclingRWTH Aachen UniversityAachenGermany
  3. 3.Hydro Aluminium Rolled Products GmbHBonnGermany
  4. 4.Parc Economique Centr’alpConstellium Technology CenterVoreppeFrance

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