Effect of Magnetic Separation in Heavy Metals of Municipal Solid Waste Incineration Bottom Ash


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Bottom ash contains many ferrous materials (e.g. ferrous metals, Fe3O4, Fe2O3, FeS). In addition, ferrous metals include the heavy metals, as Ni and Cr have a chemical attraction to iron, with Cu used to coat with Ni and Cr metals for polishing or to prevent corrosion. For ferrous metals, the formation of a Fe3O4-Fe2O3 double layer (similar to pure Fe) was found during air-annealing in an incinerator (1000C). A strong thermal shock, such as that which takes place during water-cooling of bottom ash, leads to the breakdown of this oxidation layer, facilitating the degradation of ferrous metals and the formation of corrosion products. Therefore, Fe-ion (heavy metal) oxides can be formed on ferrous metals, and magnetic separation can separate it from bottom ash. Thus, in this study the objection is to investigate the separation ratio of heavy metals by magnetic separation along with the mineralogical formation of Fe-ion (a heavy metal).



Materials Science Forum (Volumes 544-545)

Edited by:

Hyungsun Kim, Junichi Hojo and Soo Wohn Lee




G. C. Han et al., "Effect of Magnetic Separation in Heavy Metals of Municipal Solid Waste Incineration Bottom Ash", Materials Science Forum, Vols. 544-545, pp. 557-560, 2007

Online since:

May 2007




[1] Ministry of Environment in Korea: The national waste generation and the present state of treatment 2004, (2005).

[2] Kist Europe: State of the art of ash and construction waste recycling in Europe and plan for cooperation, (2002).

[3] A.P. Miodownik. Vol. 18 (1970), pp.541-547.

[4] A.L. Delgado, C. Pena, V. Lopez and F.A. Lopez: Fesources, Conservation and Fecycling Vol. 40 (2003), pp.39-51.

[5] W. Bruckner, S. Baunack, M. Hecker, J. Thomas, S. Groudeva-Zotova and C.M. Schneider: Materials Science and Engineering Vol. 86 (2001), pp.272-275.

DOI: https://doi.org/10.1016/s0921-5107(01)00696-1