Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/2052
Title: The use of diffuse reflectance spectroscopy for the characterization of iron ores.
Authors: Costa, Geraldo Magela da
Barrón, Vidal
Ferreira, César Mendonça
Torrent, José
Keywords: Iron ores
Goethite
Martite
Specularite
Reflectance
Issue Date: 2009
Citation: COSTA, G. M. et al. The use of diffuse reflectance spectroscopy for the characterization of iron ores. Minerals Engineering, v. 22, n.14, p. 1245-1250, 2009. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0892687509001587>. Acesso em: 28 jan. 2013.
Abstract: The aim of this work was to develop a diffuse reflectance methodology for quantifying minerals in powdered iron ores, which is a key quality control requirement for these materials. Selected samples ranging widely in their concentrations of hematite (as specularite and martite), goethite, magnetite, and quartz were collected in mines from the Iron Quadrangle, Minas Gerais State, and also in the Carajás region, Pará State, Brazil. A chemometric analysis based on the concentrations of the different minerals as determined with a combination of conventional methods (chemical analysis, X-ray diffraction, Mössbauer spectroscopy, light-reflected microscopy, and magnetic susceptibility) and the principal components derived from the diffuse reflectance spectra in the visible range was performed. Principal component regression analysis provided successful calibration for the concentrations of goethite (r2 = 0.94; standard error of validation (SEv) = 4.2%) and hematite (r2 = 0.89; SEv = 7.4%), in addition to good estimates for quartz (r2 = 0.83; SEv = 7.4%), specularite (r2 = 0.80; SEv = 11.6%), and martite (r2 = 0.78; SEv = 10.6%). Our results suggest that diffuse reflectance spectroscopy is a promising tool for the simultaneous determination of minerals in iron ores within a few minutes only.
URI: http://www.repositorio.ufop.br/handle/123456789/2052
ISSN: 08926875
metadata.dc.rights.license: O periódico Minerals Engineering concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3313110289313.
Appears in Collections:DEQUI - Artigos publicados em periódicos

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