Caracterização de minério de ferro por espectroscopia de reflectância difusa

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

The identification and quantification of the mineralogical phases present in iron ore is of crucial importance, both for quality control and well as for mine planning, processing, etc.. The element iron is usually found in the form of oxides or hydroxides, such as hematite (α- Fe2O3), goethite (α-FeOOH) and magnetite (Fe3O4), and their colors are a characteristic attribute. The close relationship between the mineralogical phase contents and the spectrum obtained in the ultra-violet, visible, near- and mid infrared spectral regions allows the identification and quantification of these phases. In this study the diffuse reflectance spectrophotometry was chosen to identify e quantify the constituents of several iron ores. Calibration models, using the chemometric software PARLES, for hematite, especularite, martite, goethite, magnetite, quartz and total iron were obtained from the reflectance curves and the mineral contents. The best correlations were obtained in the portable equipment ASD (350-2500 nm) for goethite R2 C = 0.96, magnetite R2 C = 0.90 and martite R2 C = 0.84; and in the MIR (2500-25000 nm) for especularite R2 C = 0.89, iron R2 C = 0.87 and quartz R2 C = 0.89. For hematite the best correlation was found in the CARY/MIR (319-25000 nm ) R2 C = 0.91. These models can be used to quantify the above mentioned phases in an unknown iron ore sample.

ASSUNTO(S)

minérios de ferro mossbauer, espectroscopia de tratamento de minerios raios x - difração espectroscopia reflectância difusa

ACESSO AO ARTIGO

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