Synthesis of an Anticorrosive Pigment by Thermal Treatment of Iron Oxides from Steel Industry Wastes

María Angélica Colpas-Ruiz; Camilo Gnecco-Molina; Gabriel Antonio Jiménez-Rodríguez; José Andrés Pérez-Mendoza; Óscar Fabián Higuera-Cobos

doi:10.19053/01211129.v28.n52.2019.9653

Authors

María Angélica Colpas-Ruiz Universidad del Atlántico https://orcid.org/0000-0002-5806-2533
Camilo Gnecco-Molina Universidad del Atlántico https://orcid.org/0000-0001-7858-7524
Gabriel Antonio Jiménez-Rodríguez, M.Sc. Universidad del Atlántico https://orcid.org/0000-0002-4771-2959
José Andrés Pérez-Mendoza, M.Sc. Universidad del Atlántico https://orcid.org/0000-0002-3889-3495
Óscar Fabián Higuera-Cobos, Ph. D. Universidad del Atlántico https://orcid.org/0000-0002-4836-5215

DOI:

https://doi.org/10.19053/01211129.v28.n52.2019.9653

Keywords:

anticorrosive pigment, hematite, iron oxides, steel industry waste, thermal treatment, X ray diffraction

Abstract

This work reports the obtaining of an anticorrosive pigment composed mainly of hematite (ɑ-Fe₂O₃) from a powder steel industry waste from rust scale of rebar steel. This residue is mainly composed of Fe₂O₃ (87.97 %), SiO₂ (6.13 %), CaO (1.88 %), Al₂O₃ (1.30%) and MnO (0.77 %). The total iron oxide of the residue is constituted by the following crystalline phases: magnetite, maghemita, lepidocrocita, wüstite, goethite and hematite. The production of a pigment with a high content of hematite was possible thanks to the high content of precursor iron oxides, which were calcined at different temperatures (750-850 °C) and holding times (0.5-1.50 h). For characterizing the iron content chemically and to identify their iron oxides phases, it was used X-ray fluorescence (XRF) and X-ray diffraction (XRD). The results showed that the pigment with the highest amount of hematite (ɑ-Fe₂O₃) was obtained at a calcination temperature of 850 °C and a holding time of 1.00 h.

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