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Scientific Publication Citing Dragonfly

Porosity characterization of iron ore pellets by X-ray microtomography

Karen Soares Augustoa (1), Sidnei Paciornika (1)
Material Research, 21, Issue 2, January 2018. DOI: 10.1590/1980-5373-mr-2017-0621


Iron ore pellets, Porosity characterization, X-ray microtomography, Image analysis


This work proposes a three-dimensional methodology to characterize porosity in iron ore pellets by X-ray Microtomography (microCT). An image analysis routine was developed to discriminate and quantify open/closed porosity. The results were compared to the traditional techniques of mercury intrusion porosimetry (MIP) and optical microscopy (OM). As expected, the porosity values obtained from microCT were much lower than those from MIP and OM, due to the lower spatial resolution of the proposed technique. However, the resolution can be optimized to detect the main peak of the pore size distribution, close to 10 µm. MicroCT was also able to discriminate between open and closed porosities, and revealed the volumetric spatial distribution of the pores, parameters that cannot be obtained from the other techniques. Thus, microCT may become a new standard for this analysis, eliminating the need for specimen preparation (as for OM) or the use of toxic materials (as in MIP).

How Our Software Was Used

Dragonfly was used to perform image processing after microCT acquisition.

Author Affiliation

(1) Departamento de Engenharia Química e de Materiais, DEQM, Pontifícia Universidade Católica do Rio de Janeiro, PUC-Rio, Rio de Janeiro, Brazil.

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