Reaction mechanism on the smelting reduction of iron ore by solid carbon |
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Authors: | Jae-Cheol Lee Dong-Joon Min Sung-Soo Kim |
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Affiliation: | (1) the Process Metallurgy Research Team, Research Institute of Industrial Science and Technology, 790-600 Pohang, Korea;(2) the Department of Metallurgical Engineering, Yonsei University, 120-749 Seoul, Korea;(3) the Department of Metallurgical Engineering, Yeungnam University, 713-749 Kyung Pook, Korea |
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Abstract: | The kinetics of the smelting reduction of iron ore by a graphite crucible and carbon-saturated molten iron was investigated
between 1400 °C and 1550 °C, and its reaction phenomena were continuously observed in situ by X-ray fluoroscopy. In the smelting reduction by graphite, it was shown from the observation results that the smelting
reduction reaction proceeded by the following two stages: an initial quiet reduction without foaming (stage I) and a following
highly active reduction with severe foaming (stage II). At 1500 °C, by the graphite crucible, the reduction rate of iron ore
was found to be 8.88×10−5 mol/cm2 · s, and by the molten iron, 8.25×10−5 mol/cm2·s. The activation energies for the reduction by the graphite crucible and the molten iron were 24.1 and 22.9 kcal/mol, respectively.
Based on the results of kinetic research and X-ray fluoroscopic observations, it can be concluded that these two types of
smelting reduction reactions of iron ore by the graphite crucible and by the molten iron are essentially the same. |
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