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 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.

• Fecha de publicación: 2019
• Institución: Universidad Pedagógica y Tecnológica de Colombia
• Repositorio: RiUPTC: Repositorio Institucional UPTC
• Idioma: spa; eng
• OAI Identifier: oai:repositorio.uptc.edu.co:001/14243
• Acceso en línea: https://revistas.uptc.edu.co/index.php/ingenieria/article/view/9653; https://repositorio.uptc.edu.co/handle/001/14243
• Palabra clave: 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
• License: http://purl.org/coar/access_right/c_abf197