Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/5083
Title: Refinement of the isomorphic substitutions in goethite and hematite by the Rietveld method, and relevance to bauxite characterization and processing.
Authors: Neumann, Reiner
Avelar, Angela Nair
Costa, Geraldo Magela da
Keywords: Bauxite
X-ray diffraction
Rietveld method
Mineral phase quantification
Isomorphous substitution
Issue Date: 2014
Citation: NEUMANN, R.; AVELAR, A. N.; COSTA, G. M. da. Refinement of the isomorphic substitutions in goethite and hematite by the Rietveld method, and relevance to bauxite characterization and processing. Minerals Engineering, v. 55, p. 80-86, 2014. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0892687513002938>. Acesso em: 02 fev. 2015.
Abstract: Although bauxites usually have a quite simple mineralogy – gibbsite (+boehmite), quartz, kaolinite, hematite, goethite, anatase (+rutile) and minor or less common phases, fine particle size, low crystallinity and variable compositions of the iron minerals might render phase quantification difficult, as well as impairing bauxite processing. A reliable and complete characterisation is therefore necessary in order t predict processing performance and ensure compliance to plant specifications. X-ray diffraction is the most important single tool for bauxite characterisation, and the constrained refinement of the Al-for-Fe substitution in goethite during one-step phase quantification by fundamental parameters Rietveld method has been successfully used. The same method was developed to analyse the coupled Al-for-Fe and OH_-for-O2_ substitutions in hematite. The method was tested against Mössbauer spectroscopy iron distribution on bauxite samples with a large compositional range, and on bauxite Certified Reference Materials from the main Brazilian mines, with improved results and widened range of conclusions that can be drawn related to bauxite processing.
URI: http://www.repositorio.ufop.br/handle/123456789/5083
metadata.dc.identifier.doi: https://doi.org/10.1016/j.mineng.2013.09.020
ISSN: 0892-6875
metadata.dc.rights.license: O periódico Minerals Engineering concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3577160367605.
Appears in Collections:DEQUI - Artigos publicados em periódicos

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