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Cold-Briquetted Iron and Carbon (CBIC): Investigation of the Influence of Environmental Condition on Its Chemical and Physical Properties

  • Pouyan PaknahadEmail author
  • Masoud Askari
  • Seyed Ali Shahahmadi
Research Article
  • 13 Downloads

Abstract

In this study, a comprehensive investigation was carried out on the effects of environmental condition on physical and chemical properties of Cold-Briquetted Iron and Carbon (CBIC), Cold Direct Reduced Iron (CDRI), and Hot-Briquetted Iron (HBI). The results showed that cold briquetting of CDRI decreases its specific surface area by 51%, which has a significant effect on its oxidation resistance and mechanical strength. Microscopic observations revealed that the oxidation products are formed in near-surface porosities during aging, which protects the fresh material underneath from environmental oxidants, resulting in retarding further oxidation. The oxidation behavior of the samples showed that after about 2 months, the metallization degree-loss rate undergoes a big change because of the transition of the oxidation mechanism from reaction-control to diffusion-control condition. Comparing the oxidation behaviors of samples demonstrated that cold briquetting of CDRI with molasses and sodium silicate binders improves its oxidation resistance by 55% and 65%, respectively. The crushing strength of CBIC with sodium silicate binder in the humid medium reached a steady-state condition after 7 days from beginning of aging. But, the crushing strength of CBIC with molasses was significantly affected by the environmental humidity, so that after 7 days its strength decreased.

Keywords

Cold-briquetted iron and carbon Environmental condition Aging Oxidation resistance 

Notes

Acknowledgements

The authors acknowledge the support of this research provided by the Tadbir Sanat Asia (TSA) Company and the Sahut-Conreur Company

Compliance with Ethical Standards

Conflict of interest

On behalf of all authors, the corresponding author states that there are no conflicts of interest.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Pouyan Paknahad
    • 1
    Email author
  • Masoud Askari
    • 1
  • Seyed Ali Shahahmadi
    • 2
  1. 1.Department of Materials Science and EngineeringSharif University of TechnologyTehranIran
  2. 2.Tadbir Sanat Asia CompanyTehranIran

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