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

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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.

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Acknowledgements

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

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Sharif University of Technology, P. O. Box 4113459547, Tehran, Iran

    Pouyan Paknahad & Masoud Askari

  2. Tadbir Sanat Asia Company, P. O. Box 1436965197, Tehran, Iran

    Seyed Ali Shahahmadi

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  1. Pouyan Paknahad
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  2. Masoud Askari
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  3. Seyed Ali Shahahmadi
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Correspondence to Pouyan Paknahad.

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The contributing editor for this article was S. Kitamura.

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Paknahad, P., Askari, M. & Shahahmadi, S.A. Cold-Briquetted Iron and Carbon (CBIC): Investigation of the Influence of Environmental Condition on Its Chemical and Physical Properties. J. Sustain. Metall. 5, 497–509 (2019). https://doi.org/10.1007/s40831-019-00240-y

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  • DOI: https://doi.org/10.1007/s40831-019-00240-y

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