Characterization and three-dimensional reconstruction of pores of self-reducing pellets done by EAF dust

Abstract

This work focused on the characterization physical and microstructural of the self-reducing pellet made of Electric Arc Furnace (EAF) dust using different low cost techniques. The serial sectioning technique was used to evaluate detailed measurements of pore connections, tortuositiy of pores and porosity distribution. The chemical analysis using Inductively Coupled Plasma Atomic Emission Spectroscopy (ICPAES), Scanning Electron Microscopy (SEM), Optical Microscopy (OM) and X-ray diffraction were carried out to identify the common phases presented in EAF dust agglomerate. It was observed that the pellet phase composition is formed by iron as magnetite, metallic iron, wustite, and zinc ferrite. The visualization of the reconstructed 3D microstructure provided average qualitative and quantitative analysis of the porosity (41.61%), a consistent result and in accordance with that obtained by pycnometry technique (41.53%). As expected, these results are more precise when compared with the result obtained by two-dimensional technique (23.41%). In addition, it was calculated the value of the tortuosity parameter (0.84) that suggested a morphological structure closest to cylindrical shape.

Study on Effect of EAFD Particulate Reinforcement in AA7075 Aluminum Matrix Composites

“…The type of scrap metal melted inside the electric arc furnace (EAF) determines the chemical composition of the dust, which is defined as a rich material in ferrous or nonferrous metal. EAFD is composed of iron and zinc oxide, which is volatilized, and also calcium, chromium, magnesium, sílica and, other toxic compounds as lead and cadmium 2,3,4,5 .…”

Microtomografia Computadorizada De Raios X Aplicada À Caracterização De Porosidade Em Pelotas De Minério De Ferro

“…Figura 38 -Valores médios de porosidade relativa das pelotas em cada um dos estágios de produção [37]. 58…”