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<p>Understanding how pores form enables control over the structure and metallurgical properties of iron ore feedstock. This study pursued two objectives: (i)&#xa0;to test whether fractal analysis is applicable to the pore structure of iron ore pellets at different production stages (dry, indurated, and reduced), and (ii)&#xa0;to quantify the internal surface area of pores per unit volume. Scanning electron microscopy micrographs were acquired at multiple magnifications. The fractal dimension&#xa0;(<i>D</i>) was estimated using the box-counting (covering) method. Across image-processing workflows and magnifications, <i>D</i> remained within a&#xa0;narrow range (1.85–1.95), indicating self-similarity (scale invariance); moreover, <i>D</i> showed a&#xa0;slight upward trend with increasing image scale, further supporting the fractal nature of the pellet pore network. The internal surface area of pores with equivalent diameters of 10–100 µm was on the order of 10–100 m<sup>2</sup>/m<sup>3</sup>.</p>

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Fractal approach to assessing the pore surface area of iron ore pellets

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Ivan S. Bersenev,
  • Aitber M. Bizhanov,
  • Vladimir V. Bragin,
  • Andrey I. Gruzdev,
  • Emil R. Sabirov,
  • Nikolay A. Spirin

摘要

Understanding how pores form enables control over the structure and metallurgical properties of iron ore feedstock. This study pursued two objectives: (i) to test whether fractal analysis is applicable to the pore structure of iron ore pellets at different production stages (dry, indurated, and reduced), and (ii) to quantify the internal surface area of pores per unit volume. Scanning electron microscopy micrographs were acquired at multiple magnifications. The fractal dimension (D) was estimated using the box-counting (covering) method. Across image-processing workflows and magnifications, D remained within a narrow range (1.85–1.95), indicating self-similarity (scale invariance); moreover, D showed a slight upward trend with increasing image scale, further supporting the fractal nature of the pellet pore network. The internal surface area of pores with equivalent diameters of 10–100 µm was on the order of 10–100 m2/m3.