Raman spectroscopic analysis of real samples: Brazilian bauxite mineralogy |
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Authors: | Faulstich Fabiano Richard Leite Castro Harlem V de Oliveira Luiz Fernando Cappa Neumann Reiner |
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Institution: | CETEM-Centre for Mineral Technology, Division for Technological Characterisation, Rio de Janeiro, RJ, Brazil. ffaulstich@cetem.gov.br |
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Abstract: | In this investigation, Raman spectroscopy with 1064 and 632.8 nm excitation was used to investigate real mineral samples of bauxite ore from mines of Northern Brazil, together with Raman mapping and X-rays diffraction. The obtained results show clearly that the use of microRaman spectroscopy is a powerful tool for the identification of all the minerals usually found in bauxites: gibbsite, kaolinite, goethite, hematite, anatase and quartz. Bulk samples can also be analysed, and FT-Raman is more adequate due to better signal-to-noise ratio and representativity, although not efficient for kaolinite. The identification of fingerprinting vibrations for all the minerals allows the acquisition of Raman-based chemical maps, potentially powerful tools for process mineralogy applied to bauxite ores. |
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