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Cyclones and fabric filters dusts from secondary aluminium flue gases: a characterization and leaching study
Tsakiridis, P. E.; Oustadakis, P.; Moustakas, K. & Agatzini, S. L.
Abstract
The present work aims at the characterization
and leachability examination of aluminium dusts, generated
during the secondary aluminium production from
scrap. Two different types of dusts were examined: a
cyclone aluminium dust and a fabric filter aluminium dust,
derived from the waste gases de-dusting system, produced
during the Al scrap meltdown. The characterization of
both dusts was carried out using particle size distribution
analysis, chemical analysis, X-ray diffraction and thermogravimetric/differential thermal analyses. Their
microstructure and morphological characteristics were
examined by scanning electron microscopy and transmission
electron microscopy. The results showed that the basis
of the examined dusts was different, as they consisted of
different mixtures of metallic aluminium, salt flux constituents,
aluminium oxide and aluminium nitrides. Their
behaviour during leaching was determined by the toxicity
characteristic leaching procedure test and the EN 12457-2
compliance leaching test. The results revealed that both
dusts should be treated as hazardous wastes and in case of
landfilling they should be disposed of at appropriate, regulation-
prescribed waste dumps, after removing the water-soluble
phases, such as chlorides or nitrides.
Keywords
Secondary aluminium dust; Cyclones; Fabric filters; Characterization; Leachability
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