On the Detection of Spectral Emissions of Iron Oxides in Combustion Experiments of Pyrite Concentrates

• DOI: 10.3390/s20051284
• Publication Date: 2020-02-28T14:30:36Z
• Authors: Carlos Toro; Sergio Torres; Víctor Parra; Rodrigo Fuentes; Rosario Castillo; Walter Díaz; Gonzalo Reyes; Eduardo Balladares; Roberto Parra
• Keywords: Iron sulfide; Spectral resolution

In this paper, we report on the spectral detection of wustite, Fe(II) oxide (FeO), and magnetite, Fe(II, III) (Fe3O4), molecular emissions during combustion pyrite (FeS2), in a laboratory-scale furnace operating at high temperatures. These species are typically generated by reactions occurring (oxidation) iron sulfide mineral. Two schemes addressed: first consisting measurements with built-in developed spectrometer sensitivity resolution. The second one spectra measured low resolution commercial spectrometer, but enhanced analyzed post signal processing multivariate data analysis such as principal component (PCA) curve resolution—the alternating least squares method (MCR-ALS). A non-linear model is also proposed to reconstruct signals combustion. Different conditions were studied evaluate capacity follow oxides. results show direct correlation between FeO Fe3O4 features intensity, relations key variables flame temperature, combusted mineral particle size.