Refinement of the isomorphic substitutions in goethite and hematite by the Rietveld method, and relevance to bauxite characterization and processing.

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorNeumann, Reiner-
Autor(es): dc.creatorAvelar, Angela Nair-
Autor(es): dc.creatorCosta, Geraldo Magela da-
Data de aceite: dc.date.accessioned2019-11-06T13:33:20Z-
Data de disponibilização: dc.date.available2019-11-06T13:33:20Z-
Data de envio: dc.date.issued2015-04-14-
Data de envio: dc.date.issued2015-04-14-
Data de envio: dc.date.issued2014-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/5083-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/557975-
Descrição: dc.descriptionAlthough 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.-
Idioma: dc.languageen-
Direitos: dc.rightsO Periódico Minerals Engineering concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3577160367605.-
Palavras-chave: dc.subjectBauxite-
Palavras-chave: dc.subjectX-ray diffraction-
Palavras-chave: dc.subjectRietveld method-
Palavras-chave: dc.subjectMineral phase quantification-
Palavras-chave: dc.subjectIsomorphous substitution-
Título: dc.titleRefinement of the isomorphic substitutions in goethite and hematite by the Rietveld method, and relevance to bauxite characterization and processing.-
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