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Effect of Annealing on Properties of Carbonaceous Materials. Part II: Porosity and Pore Geometry

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Abstract

The pore structure of carbonaceous materials was studied using image analysis. The effect of annealing on the porosity and pore geometry of cokes, chars, and pyrolyzed coals (laboratory chars) was examined in the temperature range of 973 K to 1773 K (700 °C to 1500 °C). The porosity of chars and pyrolyzed coals significantly increased during annealing at temperatures below 1373 K (1100 °C) due to volatile matter release. Further increasing of the annealing temperature from 1373 K to 1773 K (1100 °C to 1500 °C) caused marginal porosity evolution. The porosity of cokes was not affected by annealing at temperatures below 1573 K (1300 °C) and slightly increased in the temperature range 1573 to 1773 K (1300 °C to 1500 °C). The increase in the porosity of chars and pyrolyzed coals during annealing at temperatures 1373 K to 1773 K (1100 °C to 1500 °C), and cokes at 1573 K to 1773 K (1300 °C to 1500 °C), was a result of reactions with oxides of their mineral phases. Annealing had a marginal effect on the pore shape (Feret ratio) of carbonaceous materials, but enlarged the pore size of chars and pyrolyzed coals and decreased their pore density.

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Acknowledgments

This project was financially supported by Tasmanian Electrometallurgical Company and the Australian Research Council (ARC Linkage Project LP 098493). Pyrolyzed coal samples were prepared at the CSIRO Energy Centre, Newcastle, Australia. The proximate, ultimate, and petrographic analyses were completed by Sinosteel Anshan Research Institute of Thermo-energy Co., Ltd., China.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of New South Wales, Sydney, NSW, 2052, Australia

    Xing Xing (Postdoctoral Fellow) & Oleg Ostrovski (Professor)

  2. School of Mechanical, Materials & Mechatronic Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia

    Guangqing Zhang (Lecturer)

  3. CSIRO Energy Centre, 10 Murray Dwyer Circuit, Steel River Estate, Mayfield West, NSW, 2304, Australia

    Mark Dell’Amico (Project Scientist)

  4. Tasmanian Electro Metallurgical Company, PO Box 164, George Town, TAS, 7253, Australia

    George Ciezki (Manager Production Planning & Smelting Manganese)

  5. Sinosteel Anshan Research Institute of Thermo-Energy Co., Ltd, Anshan, Liaoning, China

    Qingbo Meng (Vice-President)

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  1. Xing Xing
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  2. Guangqing Zhang
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  3. Mark Dell’Amico
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  4. George Ciezki
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  5. Qingbo Meng
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  6. Oleg Ostrovski
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Correspondence to Xing Xing.

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Manuscript submitted February 14, 2013.

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Xing, X., Zhang, G., Dell’Amico, M. et al. Effect of Annealing on Properties of Carbonaceous Materials. Part II: Porosity and Pore Geometry. Metall Mater Trans B 44, 862–869 (2013). https://doi.org/10.1007/s11663-013-9854-4

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  • DOI: https://doi.org/10.1007/s11663-013-9854-4

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