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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. 13, No. 2, 2016, pp. 755-760
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Bioline Code: st16070
Full paper language: English
Document type: Short Communication
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 13, No. 2, 2016, pp. 755-760
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Air classification of blast furnace dust catcher dust for zinc load reduction at the sinter plant
Lanzerstorfer, C.
Abstract
The off-gas discharged from a blast furnace is
de-dusted in a first stage by a dust catcher or a cyclone. The
separated dust consists mainly of iron and coke. Therefore,
most of this dust is recycled in the sinter plant. A higher Zn
content of the dust is undesirable because the allowed Zn
content in the sinter feed material is limited. The reduction
of the Zn content of the dust by a simple process would be
helpful in the case of higher Zn content in the blast furnace
dust. In classification experiments, it has been demonstrated
that the Zn content of the blast furnace dust
increases with decreasing particle size. Thus, air classification
of the dust can be applied to separate the Zn-enriched
fines. By separating a small fraction of fines (about
10–20 %) from the blast furnace dust, a reduction of the
mass of Zn in the remaining coarse fraction for recycling in
the range of 40–60 % is possible and only 5–10 % of the
carbon is lost.
Keywords
Recycling; Dust treatment; Zinc separation; Blast furnace residues
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