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Scrap has become a major raw material of the steel industry and the trend should strengthen in the future, under the influence of sustainable development policies. The ECSC 'Scrap-megaproject' results have shown that the shredder is a critical tool for improving scrap quality, i.e. its 'value in use' in the steelmaking furnace. The new project described in this report gives the knowledge of the inside parameters' influence.

The rigorous sampling procedure developed in this project to characterise the shredder residue (fluff) and all the thermal treatment trials carried out show that landfilling can be avoided for this product: it can be used as a fuel in processes such as fast pyrolysis or gasification. For this second beneficiation route, a pre-pelletisation stage will improve the results, because it will homogenise the fluff.

It was also demonstrated in this project that de-zincing by thermal treatment in a neutral gas atmosphere is feasible at the laboratory scale. The removal of zinc is achieved by evaporation, which can be accelerated by increasing the treatment temperature or increasing the gas-purging rate.

The results show that steel recycling is sustainable, because the shredding process will transform very complicated goods such as cars or household appliances into high-quality scrap, pure non-ferrous metals and a light fraction that is no more a residue but a by-product or a fuel.

There is a linear correlation between the rate of zinc removal and the velocity of gas in the reaction tube. This suggests that gas-phase mass transfer of zinc controls the de-zincing process. Inversely, the oxidation of zinc coated steel scrap to remove zinc, as ZnO is not promising, since under the present experimental conditions, i.e. oxidation in air at 500-600°C, the oxide scale does not grow with treatment time.

Additional information

Authors: SCHUBERT G, TU Bergakademie, Freiberg (DE);SANDER S, TU Bergakademie, Freiberg (DE);JANKE D, TU Bergakademie, Freiberg (DE);SAVOV L, TU Bergakademie, Freiberg (DE);PASINI G, Feralpi, Lonato (IT);FILIPPINI E, Feralpi, Lonato (IT);BIRAT J P, IRSID, Maizières-lès-Metz (FR);RUSSO P, IRSID, Maizières-lès-Metz (FR);ABOUSSOUAN L, IRSID, Maizières-lès-Metz (FR)
Bibliographic Reference: EUR 20894 EN (2003), 197pp. Euro: 25
Availability: EUR-OP reference: KI-NA-20894-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-6329-5
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