TY - JOUR
T1 - Chemical state mapping of heterogeneous reduction of iron ore sinter
AU - Kimura, M.
AU - Takeichi, Y.
AU - Murao, R.
AU - Obayashi, I.
AU - Hiraoka, Y.
AU - Liu, Y.
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2017/6/14
Y1 - 2017/6/14
N2 - Iron ore sinter constitutes the major component of the iron-bearing burden in blast furnaces, and its reduction mechanism is one of the keys to improving the productivity of ironmaking. Iron ore sinter is composed of multiple iron oxide phases and calcium ferrites (CFs), and their heterogeneous reduction was investigated in terms of changes in iron chemical state: FeIII, FeII, and Fe0 were examined macroscopically by 2D X-ray absorption and microscopically by 3D transmission X-ray microscopy (TXM). It was shown that the reduction starts at iron oxide grains rather than at calcium ferrite (CF) grains, especially those located near micropores. The heterogeneous reduction causes crack formation and deteriorates the mechanical strength of the sinter. These results help us to understand the fundamental aspects of heterogeneous reduction schemes in iron ore sinter.
AB - Iron ore sinter constitutes the major component of the iron-bearing burden in blast furnaces, and its reduction mechanism is one of the keys to improving the productivity of ironmaking. Iron ore sinter is composed of multiple iron oxide phases and calcium ferrites (CFs), and their heterogeneous reduction was investigated in terms of changes in iron chemical state: FeIII, FeII, and Fe0 were examined macroscopically by 2D X-ray absorption and microscopically by 3D transmission X-ray microscopy (TXM). It was shown that the reduction starts at iron oxide grains rather than at calcium ferrite (CF) grains, especially those located near micropores. The heterogeneous reduction causes crack formation and deteriorates the mechanical strength of the sinter. These results help us to understand the fundamental aspects of heterogeneous reduction schemes in iron ore sinter.
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U2 - 10.1088/1742-6596/849/1/012015
DO - 10.1088/1742-6596/849/1/012015
M3 - Conference article
AN - SCOPUS:85021939572
SN - 1742-6588
VL - 849
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012015
T2 - 13th International X-ray Microscopy Conference, XRM 2016
Y2 - 15 August 2016 through 19 August 2016
ER -