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Study of the structure of hot-dip galvanizing byproducts

G. VOURLIAS1,* , N. PISTOFIDIS1, EL. PAVLIDOU1, G. STERGIOUDIS1, E. K. POLYCHRONIADIS1

Affiliation

  1. Department of Physics, Aristotle University of Thessaloniki, GR 54124 Thessaloniki, Greece

Abstract

In galvanizing process several byproducts are formed. Among them solid materials composed by different compounds are grown in the galvanizing kettle. The present work examines the structure of the bottom dross and the blowing waste using X-ray and electron microscopical techniques. From this research it was deduced that bottom dross is composed by crystallites of the ζ-phase of the Fe-Zn phase diagram scattered in a matrix of pure Zn, while blowing waste, which is granular, is composed by spheres, whose core is of pure Zn covered with a layer of ZnO. Mixed Fe-Zn oxides were also detected in bottom dross. Hence these byproducts are mainly composed by pure Zn and different zinc compounds, while a large amount of iron in the form of Fe-Zn intermetallics and Fe oxides is present in bottom dross. In any case, this composition implies that the examined materials are suitable for zinc recovery..

Keywords

Zinc, Hot-dip galvanizing, XRD, SEM, TEM.

Submitted at: Jan. 15, 2007
Accepted at: Sept. 18, 2007

Citation

G. VOURLIAS, N. PISTOFIDIS, EL. PAVLIDOU, G. STERGIOUDIS, E. K. POLYCHRONIADIS, Study of the structure of hot-dip galvanizing byproducts, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 9, pp. 2937-2942 (2007)