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<p>Phenolic resins have shown great promise as binders, but their interfacial degradation behavior in high-temperature CO<sub>2</sub> environments severely limits their application in blast furnaces. Therefore, this study introduces a novel boron carbide-modified composite binder to improve the high-temperature strength and gasification resistance of coke dry quenching powder briquettes. The results showed that adding 10 wt pct of modified composite binder could significantly improve its metallurgical properties, reducing the reactivity index (CRI) of the briquettes to 11.09 pct and increasing the post-reaction strength (CSR) to 62.52 pct, which fully met the standard of blast furnace grade 1 metallurgical coke. Multiscale characterization and 3D-CT reconstruction further demonstrate that this excellent high-temperature performance is due to the preferential reaction of introduced B<sub>4</sub>C with CO<sub>2</sub> and its transformation into a low-melting-point B<sub>2</sub>O<sub>3</sub> fluid liquid phase. This liquid phase coats the surface of the resin-based glassy carbon to prevent violent gasification reactions, while effectively filling the nascent micropores to prevent structural collapse. This study elucidates the structural evolution of modified binders and the kinetic pathways of their chemical reactions, providing solid theoretical support for the development of high-performance, low-carbon alternative fuels for modern blast furnaces.</p>

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Gasification Behavior and Interfacial Strengthening Mechanism of CDQ Powder Briquettes with a Phenolic Resin–B4C Composite Binder

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Yuchen Zhang,
  • Runsheng Xu,
  • Jianliang Zhang,
  • Rongrong Wang,
  • Tianqiu Wang,
  • Yongsheng Yang,
  • Bin Wu,
  • Alberto N. Conejo,
  • Siqi Li

摘要

Phenolic resins have shown great promise as binders, but their interfacial degradation behavior in high-temperature CO2 environments severely limits their application in blast furnaces. Therefore, this study introduces a novel boron carbide-modified composite binder to improve the high-temperature strength and gasification resistance of coke dry quenching powder briquettes. The results showed that adding 10 wt pct of modified composite binder could significantly improve its metallurgical properties, reducing the reactivity index (CRI) of the briquettes to 11.09 pct and increasing the post-reaction strength (CSR) to 62.52 pct, which fully met the standard of blast furnace grade 1 metallurgical coke. Multiscale characterization and 3D-CT reconstruction further demonstrate that this excellent high-temperature performance is due to the preferential reaction of introduced B4C with CO2 and its transformation into a low-melting-point B2O3 fluid liquid phase. This liquid phase coats the surface of the resin-based glassy carbon to prevent violent gasification reactions, while effectively filling the nascent micropores to prevent structural collapse. This study elucidates the structural evolution of modified binders and the kinetic pathways of their chemical reactions, providing solid theoretical support for the development of high-performance, low-carbon alternative fuels for modern blast furnaces.