|About this Abstract
||Materials Science & Technology 2012
||Recent Developments in Steel Processing
||The Effect of Reductant Reactivity on the Shrinkage Behavior of Composite Iron Ore-Carbon Reductant Pellets during Reduction
||Aswin Tejasukmana, R J Fruehan, P C Pistorius
|On-Site Speaker (Planned)
Heat transfer into the lower layer pellets has been the limiting factor for the rotary hearth furnace (RHF) productivity. Maximal shrinkage of composite iron ore-reductant pellets during reduction is crucial in increasing the rate of heat transfer into the lower layer pellets. The reduction of iron oxide with coal relies on the strongly endothermic Boudouard reaction. Specifically, more-reactive coal is expected to result in a lower reduction temperature inside the pellets, which may reduce sintering. Composite pellets, made with pure analytical hematite (PAH) and several types of carbon reduction, were reduced inside a Vertical Tube Furnace (VTF) with sight window. The temperature of the pellet and the gas composition during the reduction were used to reconstruct chronology of the reduction, for comparison with pellet shrinkage as observed through the sight window. The results show that much pellet shrinkage can occur early in the reduction process.
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