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


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.


Dross formation UBC Thermal pre-treatment Submerged melting 


  1. 1.
    K. Krone (ed.), Aluminiumrecycling: Vom Vorstoff bis zur fertigen Legierung (Düsseldorf, VDS e. V., 2000), pp. 101–370Google Scholar
  2. 2.
    J.V. Koleske (ed.), Paint and Coating Testing Manual (ASTM Manual Series: MNL 17, Philadelphia, PA, 1995), pp. 53–106Google Scholar
  3. 3.
    D. Stoye (ed.), Paints, Coatings and Solvents (VCH Publishers, Weinheim, 1993), pp. 1–10Google Scholar
  4. 4.
    A. Gu, G. Liang, Thermal degradation behavior and kinetic analysis of epoxy/montmorillonite nanocomposites. Polym. Degrad. Stab. 80(2), 383–391 (2003)CrossRefGoogle Scholar
  5. 5.
    R.F.T. Stepto, Polymer Networks Principles of their Formation, Structure and Properties (Thomson Science, London, 1998), pp. 1–289Google Scholar
  6. 6.
    H. Stutz, K.H. Illers, J. Mertes, A generalized theory for the glass transition temperature of crosslinked and uncrosslinked polymers, J. Poly. Sci. Part B Poly. Phys. 28, 1283–1498 (1990)Google Scholar
  7. 7.
    A.P. Mouritz, A.G. Gibson, Fire Properties of Polymer Composite Materials (Dordrecht, The Netherlands, 2006), pp. 32–38Google Scholar
  8. 8.
    W. Kaiser (ed.), Kunststoffchemie für Ingenieure (Carl Hanser Verlag GmbH, München, 2011), pp. 409–444Google Scholar
  9. 9.
    A. Mlyniec, J. Korta, T. Uhl, Structurally based constitutive model of epoxy adhesives incorporating the influence of post-curing thermolysis, Composites Part B, vol. 86 (2016), pp. 160–167Google Scholar
  10. 10.
    M.-J. Xu et al., Synthesis of a cross-linked triazine phosphine polymer and its effect on fire retardancy, thermal degradation and moisture resistance of epoxy resins. Polym. Degrad. Stab. 119, 14–22 (2015)CrossRefGoogle Scholar
  11. 11.
    DIN 18128:2002–12, Soil—Investigation and Testing—Determination of Ignition Loss (2002)Google Scholar
  12. 12.
    D. Stevens et al., Oxidation of AlMg in dry and humid atmospheres, Light Metals (2011)Google Scholar
  13. 13.
    S.A. Impey, The mechanism of dross formation on aluminium and aluminium-magnesium alloys. Ph.D. Thesis, Cranfield institute of technology (1989)Google Scholar
  14. 14.
    H. Paulitsch, H. Antrekowitsch, A. Schmid, Vergleich des Abbrandverhaltens beim Rezyklieren von Aluminiumspänen und –briketts, BHM. 156(1), 6–13 (2011)Google Scholar
  15. 15.
    H. Puga et al., Recycling of aluminium swarf by direct incorporation in aluminium melts. J. Mater. Process. Technol. 209, 5195–5203 (2009)CrossRefGoogle Scholar
  16. 16.
    J. Campbell, Complete Casting Handbook (Oxford, Elsevier Ltd., 1998), pp. 3–103Google Scholar
  17. 17.
    W. Bale et al., FactSage 7.0 (Thermfact Ltd, GTT–Technologies, 2016)Google Scholar
  18. 18.
    T. Ahamad, S. Alshehri, Thermal degradation and evolved gas analysis of epoxy (DGEBA)/novolac resin blends (ENB) during pyrolysis and combustion. J. Therm. Anal. Calorim. 111, 445–451 (2013)CrossRefGoogle Scholar

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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