Abstract

COLPAS-RUIZ, María Angélica et al. Synthesis of an Anticorrosive Pigment by Thermal Treatment of Iron Oxides from Steel Industry Wastes. Rev. Fac. ing. [online]. 2019, vol.28, n.52, pp.44-58. ISSN 0121-1129.  https://doi.org/10.19053/01211129.v28.n52.2019.9653.

This work reports the obtaining of an anticorrosive pigment mostly constituted by hematite (ɑ-Fe2O3) from a powder steel industry waste from rust scale of steel reinforcing bars. This residue is mainly composed by 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, maghemite, lepidocrocite, 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.

Keywords : anticorrosive pigment; hematite; iron oxides; steel industry waste; thermal treatment; X ray diffraction.

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