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Separation of Fe and Zn in EAF Dust by Counter‐ C urrent Gas– S olid Reduction in Moving Bed
Author(s) -
Gao JinTao
Publication year - 2014
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201300181
Subject(s) - metallurgy , materials science , impurity , sintering , matrix (chemical analysis) , blast furnace , metal , analytical chemistry (journal) , nuclear chemistry , chemistry , composite material , chromatography , organic chemistry
The reactor of moving bed for counter‐current gas–solid reduction test is researched and developed. By the reformed blast furnace gas, EAF dust is reduced continuously and quickly in a non‐molten state with high reduction degree at 800–900°C. In the condition of moving speed of 0.06–0.10 m min −1 and reduction time of 10–16.7 min, the dust is highly transformed in form of Fe x O y (s) → MFe (s) and ZnO (s) → Zn (g) with the Fe and Zn separated. And Fe metallization rate averages 85%, and gas‐dezincification rate averages 92%. When the temperature is <1000°C, the sintering would not occur in reduction process, moreover, P, S, and any other impurity elements are not reduced into Fe matrix. By some simple physical methods it can be achieved that Fe, Zn elements are enriched separately, obtaining high purity metal resources directly, including Fe rich material (TFe = 92%), Zn rich material (ZnO = 91%) and none Fe material (Fe < 2%).