|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Effect of Binder Phase on Reduction Swelling Property of Iron Ore Pellet
||Xiaozhe Wang, Jian Liang Zhang, Zhengjian Liu, Xingle Liu
|On-Site Speaker (Planned)
The effect of alkalis silicate binder phase on the swelling property of pellets during reduction was studied in this paper. The results indicated that the thermal and chemical stability of alkalis silicate binder phase were poor especially when the phase included fluorine and its melting point sharply decrease to about 600℃. The work presented the swelling index (SI) increased by decreasing melting point. The reduced samples were examined by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and optical microscope. The SEM and optical microscope results showed that the bonding phase contained alkalis in the pellet became liquid during reduction and flew into the cracks or pores caused by the volume expansion due to rupture of iron oxide crystal or iron whisker growth, thus lost its bonding force to resist the stress. This phenomenon would lead to abnormal swelling and reduced permeability of packed beds of blast furnace.
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