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

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 o...

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Bibliographic Details
Main Authors:	Colpas-Ruiz, María Angélica, Gnecco-Molina, Camilo, Jiménez-Rodríguez, Gabriel Antonio, Pérez-Mendoza, José Andrés, Higuera-Cobos, Óscar Fabián
Format:	Online
Language:	spa eng
Published:	Universidad Pedagógica y Tecnológica de Colombia 2019
Subjects:	anticorrosive pigment hematite iron oxides steel industry waste thermal treatment X ray diffraction difracción de rayos X hematita óxidos de hierro pigmento anticorrosivo residuo siderúrgico tratamiento térmico
Online Access:	https://revistas.uptc.edu.co/index.php/ingenieria/article/view/9653

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Summary:	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.