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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 9, 2015, pp. 2939-2946
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Bioline Code: st15276
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 9, 2015, pp. 2939-2946
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Residues from single-stage dry de-dusting and desulphurization of sinter plant off-gas: enabling partial recirculation by air classification
Lanzerstorfer, C. & Neuhold, R.
Abstract
In iron ore sinter plants, the process off-gas is
de-dusted by electrostatic precipitators which are installed
upstream of the fan. For further reduction of emissions, a
second cleaning stage can be installed. This stage usually
comprises a sorption process for removal of acid gases and
polychlorinated dibenzo(p)dioxins and furans, followed by
a fabric filter. The residue from the first de-dusting stage
can be recirculated to the sintering process. The residue
from the second cleaning stage has to be disposed of in
landfill sites. A new single-stage off-gas cleaning concept
for sinter plants comprises an entrained flow sorption
process and a fabric filter, installed upstream of the fan. In
this way, the investment costs for the off-gas cleaning
system can be reduced significantly. However, it would
become necessary to dispose of most of the residue. In this
work, air classification of a residue equivalent to that of a
single-stage off-gas cleaning unit was investigated with the
aim of producing a fraction of this residue with reduced
sulphur and chloride concentrations which can then be
recycled. The results confirm that air classification is a
suitable process. In order to maintain raw mixture targets
for chlorine or to avoid chlorine enrichment in the raw
feed, the recommended dust recycling rate is 66 % with air
classification which is an improvement over the allowed
rates without air classification of 42 %.
Keywords
Sinter plant; Gas cleaning residue; Recycling; Air classification
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