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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Pre-Treatment of Beverage Can Scrap to Increase Recycling Efficiency
Author(s)
Jan Steglich1*, Regina Dittrich2, Marcel Rosefort1 and Bernd Friedrich2
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DOI:10.17265/2161-6213/2016.3-4.003
Affiliation(s)
1. TRIMET Aluminium SE, Aluminiumallee 1, 45356 Essen, Germany
2. RWTH Aachen, IME Process Metallurgy and Metal Recycling, Intzestr. 3, 52056 Aachen, Germany
ABSTRACT
This paper reports the initial results of thermal pre-treatment of used beverage can scrap in an industrial size reverberatory multi-chamber shaft furnace. By investigating the heating conditions in the pre-heating shaft, conclusions about improving de-coating parameters are made. In the second step, the de-coated scrap was remelted in a new laboratory experiment with focus on dross formation by solid-liquid reactions. These results indicate that de-coating to minimize dross formation is possible in oxygen containing atmosphere of a multi-chamber furnace. By avoiding a maximum temperature above 500 °C in the baled beverage can scrap, oxidation of the material was limited and de-coating maximized under given furnace conditions. By preventing dross formation during the melting in a reverberatory furnace, the metal recovery is increased. Using the hot furnace off-gas to pre-heat the scrap and post-combusting the thermolysis gases of organic contamination decrease energy consumption. Resource and energy consumption are minimised while making the recycling process more energy efficient at the same time.
KEYWORDS
Used beverage can, recycling, multi-chamber furnace, dross, de-coating.
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