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An application of the Rietveld refinement method to the mineralogy of a bauxite-bearing regolith in the lower Amazon

Leonardo Boiadeiro Ayres Negrao, Marcondes Lima da Costa, Herbert Poellmann and Axel Horn
An application of the Rietveld refinement method to the mineralogy of a bauxite-bearing regolith in the lower Amazon
Mineralogical Magazine (April 2018) 82 (2): 413-431

Abstract

A comparison of Rietveld refinement results for a bauxite-bearing regolith and its clayey cover in the Amazon region was made with stoichiometric calculations from chemical analysis and partly from thermogravimetric results. For this investigation a profile in the bauxite-bearing regolith occurrence in the ALCOA bauxite mine at Juruti, Brazil was studied. The different minerals, their compositions and their low crystallinity in the different horizons were investigated and the contents determined. It is evident that some minerals show several generations and some chemical composition changes that must be included in the Rietveld refinement. Al-rich hematites and goethites are common along the bauxite profile. Amorphous contents were determined with rutile added as an internal standard and shown to have gibbsite- or kaolinite-like composition. The minerals could be quantified in the different horizons and the difficulties were mainly related to variable crystalline aspects of the phases. Rietveld refinement can be a powerful tool in bauxite prospecting, quality control and during mining and beneficiation of ore minerals using the adapted refinement strategies.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 82
Serial Issue: 2
Title: An application of the Rietveld refinement method to the mineralogy of a bauxite-bearing regolith in the lower Amazon
Affiliation: Universidade Federal do Para, Instituto de Geociencias, Belem, Brazil
Pages: 413-431
Published: 201804
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 45
Accession Number: 2018-081725
Categories: General mineralogyEconomic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, sketch map
S02°13'60" - S02°04'00", W56°10'00" - W56°00'00"
Secondary Affiliation: Martin-Luther-Universitaet Halle-Wittenberg, DEU, Germany
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2018
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