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Cold-Briquetted iron and carbon (CBIC): investigation of the influence of environmental condition on its chemical and physical properties

Paknahad, P ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1007/s40831-019-00240-y
  3. Publisher: Springer , 2019
  4. Abstract:
  5. 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. © 2019, The Minerals, Metals & Materials Society
  6. Keywords:
  7. Aging ; Cold-briquetted iron and carbon ; Environmental condition ; Oxidation resistance
  8. Source: Journal of Sustainable Metallurgy ; Volume 5, Issue 4 , 2019 , Pages 497-509 ; 21993823 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s40831-019-00240-y