Title

TWO-DIMENSIONAL CHARACTERIZATION AND THREEDIMENSIONAL RECONSTRUCTION OF THE POROSITY OF THE SELF-REDUCING PELLET OF EAF

TWO-DIMENSIONAL CHARACTERIZATION AND THREEDIMENSIONAL RECONSTRUCTION OF THE POROSITY OF THE SELF-REDUCING PELLET OF EAF

Authorship

Rocha, Elisa Pinto da; Castro., José Adilson de

Rocha, Elisa Pinto da

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Castro., José Adilson de

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DOI

10.5151/2594-357X-22266

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Abstract

The reducibility and inner pore structures in the self-reducing pellet of EAF play important role on the processing technology of these materials to recycling valuable metals and carry out adequate destination of the powders. Aiming at investigating the influence of the agglomerate structure, some two-dimensional metallographic techniques have been used to evaluate the porosity in clusters with inaccurate results, essentially due its three-dimensional features. From the processing technological point of view, the shape and distribution of inner porosity of the powders agglomerates are of fundamental importance due to their effects on the reaction rates involving the present phases taking place into the reduction stage. In this study a 3D serial sectioning imaging reconstruction is proposed to specify the pores morphology and to estimate the porosity. The averaged porosities results for different fields of the sample are discussed and compared with the pores fraction obtained in two-dimensional images by SEM (Scanning Electron Microscopy). The porosity average value for three random fields chosen of the sample found by serial sectioning technique was 41.24%. The pores fraction calculation by two-dimensional digital images analysis obtained by SEM was determined using the software NIH ImageJ and the result was 23.41%, quite different from that obtained by 3D serial reconstruction, which indicates the relevance of 3D methods to obtain precise evaluation of the kinetics parameters.

The reducibility and inner pore structures in the self-reducing pellet of EAF play important role on the processing technology of these materials to recycling valuable metals and carry out adequate destination of the powders. Aiming at investigating the influence of the agglomerate structure, some two-dimensional metallographic techniques have been used to evaluate the porosity in clusters with inaccurate results, essentially due its three-dimensional features. From the processing technological point of view, the shape and distribution of inner porosity of the powders agglomerates are of fundamental importance due to their effects on the reaction rates involving the present phases taking place into the reduction stage. In this study a 3D serial sectioning imaging reconstruction is proposed to specify the pores morphology and to estimate the porosity. The averaged porosities results for different fields of the sample are discussed and compared with the pores fraction obtained in two-dimensional images by SEM (Scanning Electron Microscopy). The porosity average value for three random fields chosen of the sample found by serial sectioning technique was 41.24%. The pores fraction calculation by two-dimensional digital images analysis obtained by SEM was determined using the software NIH ImageJ and the result was 23.41%, quite different from that obtained by 3D serial reconstruction, which indicates the relevance of 3D methods to obtain precise evaluation of the kinetics parameters.

Keywords

Characterization; Porosity; Two-dimensional images; Three-dimensional images.

Characterization; Porosity; Two-dimensional images; Three-dimensional images.