TY - JOUR
T1 - Quantitative evaluation of reaction mode and reduction disintegration behavior of iron ore agglomerates during low temperature reduction
AU - Mizutani, Moritoshi
AU - Nishimura, Tsunehisa
AU - Orimoto, Takashi
AU - Higushi, Kenichi
AU - Nomura, Seiji
AU - Saito, Koji
AU - Kasai, Eiki
N1 - Publisher Copyright:
© 2018 ISIJ
PY - 2018/10
Y1 - 2018/10
N2 - The utilization of H2 in the ironmaking process is a potential option for a further reduction of CO2 emission from the blast furnace (BF). H2 promotes the reduction reaction of burden materials, but its influence on their reduction disintegration behavior remains unknown in detail. This study investigates its influence on the specified essential factors governing the reduction disintegration behavior of the iron ore agglomerates, i.e., iron ore sinters and pellets. Reduction disintegration index (RDI) values were measured after the reduction of the agglomerate samples using the gas mixtures of CO–H2–CO2–N2. The mineral textures of reduced samples were observed using an optical-microscope and an electron probe micro-analyzer for the evaluation of reaction modes. Further, Thiele modulus (), which is considered as the index of reaction modes during reduction, was calculated using the measurement results. The calculated showed reasonable correlation with RMI values, which is one index of the reaction mode evaluated by an elemental analysis using EPMA. Disintegration does not make much progress when is larger than a certain limit value, whereas it proceeds significantly when is less than that value.
AB - The utilization of H2 in the ironmaking process is a potential option for a further reduction of CO2 emission from the blast furnace (BF). H2 promotes the reduction reaction of burden materials, but its influence on their reduction disintegration behavior remains unknown in detail. This study investigates its influence on the specified essential factors governing the reduction disintegration behavior of the iron ore agglomerates, i.e., iron ore sinters and pellets. Reduction disintegration index (RDI) values were measured after the reduction of the agglomerate samples using the gas mixtures of CO–H2–CO2–N2. The mineral textures of reduced samples were observed using an optical-microscope and an electron probe micro-analyzer for the evaluation of reaction modes. Further, Thiele modulus (), which is considered as the index of reaction modes during reduction, was calculated using the measurement results. The calculated showed reasonable correlation with RMI values, which is one index of the reaction mode evaluated by an elemental analysis using EPMA. Disintegration does not make much progress when is larger than a certain limit value, whereas it proceeds significantly when is less than that value.
KW - Blast furnace
KW - Hydrogen
KW - Reaction mode
KW - Reduction disintegration
KW - Thiele modulus
UR - http://www.scopus.com/inward/record.url?scp=85055199474&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85055199474&partnerID=8YFLogxK
U2 - 10.2355/isijinternational.ISIJINT-2017-744
DO - 10.2355/isijinternational.ISIJINT-2017-744
M3 - Article
AN - SCOPUS:85055199474
VL - 58
SP - 1761
EP - 1767
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
SN - 0915-1559
IS - 10
ER -