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Título: | Refinement of the isomorphic substitutions in goethite and hematite by the Rietveld method, and relevance to bauxite characterization and processing. |
Autor(es): | Neumann, Reiner Avelar, Angela Nair Costa, Geraldo Magela da |
Palavras-chave: | Bauxite X-ray diffraction Rietveld method Mineral phase quantification Isomorphous substitution |
Data do documento: | 2014 |
Referência: | 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. |
Resumo: | 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 |
DOI: | https://doi.org/10.1016/j.mineng.2013.09.020 |
ISSN: | 0892-6875 |
Licença: | O periódico Minerals Engineering concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3577160367605. |
Aparece nas coleções: | DEQUI - Artigos publicados em periódicos |
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Arquivo | Descrição | Tamanho | Formato | |
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ARTIGO_RefinementIsomorphicSubstitutions.pdf | 1,04 MB | Adobe PDF | Visualizar/Abrir |
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