Material and Energy Beneficiation of the Automobile Shredder Residues
Although vehicles represent a main key of our modern society, they affect our environment via the energy and resource consumption, waste generation during their manufacturing as well as greenhouse gas emissions all along their use. Further, hazardous residues are produced at the end-of-life vehicles “ELV”. After collection and dismantling, the remainders of the ELV are directed to shredding operator followed by a series of mechanical and physical separations in order to recover the ferrous and non-ferrous metals. The residue of the shredding process, called automobile shredder residue “ASR” represents about 20–25% of the ELV. The ASR, while toxic enough to be classified as hazardous waste, could be considered as material and energy sources.
The present study deals with the possibility of material and energy beneficiation of the ASR by its use in the metallurgical units. ASR samples from an European automobile shredder company were collected and subjected to the physical separation process followed by a thermodynamic approach and isothermal batch tests to assess the reducing performance and energy capacity of the ASR hydrocarbon matter. Particular attention was devoted to the behavior of several residual and tramp elements (Cl, Pb, Cu, Zn) affecting the metallurgical process and the product quality. Results showed that physical operations (screening, attrition, dry low intensity magnetic separation) lead to a selective extraction of the mineral part of the ASR which can be directed to the blast furnace unit. Direct reduction of hematite by the plastics contained in the ASR was obtained at 1000–1050 °C resulting into multistage steps of Fe2O3 converting into metallic iron. Multi-parametric analysis of the results suggests that the purified ASR can partially substitute raw materials used in pig iron and steel production.
Keywordsautomobile shredder residues thermal beneficiation iron oxides reduction
Unable to display preview. Download preview PDF.
- 2.Andersen, F., Larsen, H., Skovgaard, M. “Projection of end-of-life vehicles: development of a projection model and estimates for ELVs for 2005–2030”. ETC/RWM working paper 2008/2, Copenhagen (2008).Google Scholar
- 4.GHK/BioIS Intelligence Service. “A study to examine the benefits of the End of Life Vehicles Directive”- (Final report to DG Environment, 2006), from: http://ec.europa.eu/environment/waste/elv_study.htm
- 5.Directive 2000/53/CE du parlement européen et du conseil du 18 septembre 2000 relative aux véhicules hors d’usage. J. Officiel des Communautés européennes, L 269/34 (2000).Google Scholar
- 7.Jalkanen, H. “On the direct recycling of automotive shredder residue and electronic scrap in metallurgical industry”. Acta Metall. Slovaca, 12 (2006), 2625 — 2643.Google Scholar
- 9.Kanari, N., Menad, N., Diot, F., Filippov, L., Thomas, F., Yvon, J.: “Beneficiation of PVC wastes in iron oxide reduction”. Proceedings of the 43rd International October Conference on Mining and Metallurgy, Kladovo, Serbia, 408–411 (2011).Google Scholar
- 10.Kanari, N., Menad, N., Diot, F., Filippov, L., Thomas, F., Yvon, J. “Valorization of the automobile shredder residues by thermal route” Proceedings of the 4th International Conference on Engineering for Waste and Biomass Valorization. (WasteEng 2012), September 10th — 13th Porto Portugal. A. Nzihou & F. Castro eds. Vol 4, 1085–1090.Google Scholar