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Macrostrength and pore structure of coke subjected to gasification and annealing under blast furnace conditions

Conference Paper


Abstract


  • Metallurgical cokes were subjected to gasification by CO-CO2-N2 gas with blast furnace-like composition-temperature profile to 1400 °C and annealing under N, at temperature up to 2000 °C. The degradation of coke strength following reaction and annealing was characterised using tensile testing. Both gasification and annealing decreased the mechanical strength of coke. Degradation of all examined cokes by gasification at 1400 °C was stronger in comparison with annealing at the same temperature. Pore structure of cokes was examined using image analysis. Porosity and pore size were both enlarged by gasification and annealing. The pore structure change during gasification was mainly a result of Boudouard reaction; the pore structure development upon annealing was attributed to the reactions of mineral matters with carbon and transformation within the carbon framework. Annealing and gasification caused a decrease in average pore roundness, an increase in the fraction of low roundness pores and the increase of coalescence points in the pore area. Increasing amount of coalescence points during annealing and gasification was a major factor in the degradation of cokes under the simulated blast furnace conditions. AISTech 2015 Proceedings

Publication Date


  • 2015

Citation


  • Xing, X., Rogers, H., Zhang, G., Zulli, P., & Ostrovski, O. (2015). Macrostrength and pore structure of coke subjected to gasification and annealing under blast furnace conditions. In AISTech - Iron and Steel Technology Conference Proceedings Vol. 1 (pp. 64-76).

Scopus Eid


  • 2-s2.0-84940483469

Web Of Science Accession Number


Start Page


  • 64

End Page


  • 76

Volume


  • 1

Abstract


  • Metallurgical cokes were subjected to gasification by CO-CO2-N2 gas with blast furnace-like composition-temperature profile to 1400 °C and annealing under N, at temperature up to 2000 °C. The degradation of coke strength following reaction and annealing was characterised using tensile testing. Both gasification and annealing decreased the mechanical strength of coke. Degradation of all examined cokes by gasification at 1400 °C was stronger in comparison with annealing at the same temperature. Pore structure of cokes was examined using image analysis. Porosity and pore size were both enlarged by gasification and annealing. The pore structure change during gasification was mainly a result of Boudouard reaction; the pore structure development upon annealing was attributed to the reactions of mineral matters with carbon and transformation within the carbon framework. Annealing and gasification caused a decrease in average pore roundness, an increase in the fraction of low roundness pores and the increase of coalescence points in the pore area. Increasing amount of coalescence points during annealing and gasification was a major factor in the degradation of cokes under the simulated blast furnace conditions. AISTech 2015 Proceedings

Publication Date


  • 2015

Citation


  • Xing, X., Rogers, H., Zhang, G., Zulli, P., & Ostrovski, O. (2015). Macrostrength and pore structure of coke subjected to gasification and annealing under blast furnace conditions. In AISTech - Iron and Steel Technology Conference Proceedings Vol. 1 (pp. 64-76).

Scopus Eid


  • 2-s2.0-84940483469

Web Of Science Accession Number


Start Page


  • 64

End Page


  • 76

Volume


  • 1