Metallurgical and Materials Transactions B

, Volume 44, Issue 6, pp 1379–1389 | Cite as

Influence of CaO-SiO2-Al2O3 Ternary Oxide System on the Reduction Behavior of Carbon Composite Pellet: Part I. Reaction Kinetics

  • Hyunsik Park
  • Veena SahajwallaEmail author


The reduction behavior of composite pellets comprising of hematite, synthetic graphite, and several oxide binder systems was investigated in a laboratory-scale horizontal tube furnace. Three oxide binder systems using silica-rich, alumina-rich, and conventional blast furnace slag compositions were selected to examine the effect of oxide chemistry on the reduction behavior of pellets. Compositional differences in the CaO-SiO2-Al2O3 ternary system were confirmed to influence the reactions occurring in composite pellets during the reduction of iron oxide. An in situ visualization approach was used to observe the oxide/iron/carbon interactions at high temperatures from 1623 K to 1773 K (1350 °C to 1500 °C). The off-gas composition was measured by means of an infrared analyzer to determine the pellet reaction rates. Changes in physical appearance during the in situ reaction experiments demonstrated a strong correlation between the oxide composition and internal reactions. Moreover, the mechanical properties of pellets were investigated by measuring compressive strength to understand the relationship between physical properties of pellets and the associated oxide binder systems selected for this study.


Compressive Strength Iron Oxide Blast Furnace Oxide System Blast Furnace Slag 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors thank the following persons: Dr. Sushil Gupta, SMaRT center (Centre for Sustainable Materials Research and Technology) at UNSW for insightful discussion and James Dong Min Jang, POSCO (Pohang Iron and Steel making Company, Republic of Korea) for ideas regarding experimental design.


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2013

Authors and Affiliations

  1. 1.Centre for Sustainable Materials Research and Technology (SMaRT), School of Materials Science and EngineeringUniversity of New South WalesSydneyAustralia

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