Granulometric Separation of Bauxite Tailings to Metallurgical Processing

The beneficiation of bauxite ore generates significant quantities of tailings, primarily composed of kaolinite and residual gibbsite, the latter still amenable to metallurgical recovery. In this study, bauxite tailings were reprocessed based on particle size classification from 30 µm to 2 µm, obtain...

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Main Authors: Elaine Cristina Lima de Melo, Oscar Jesus Choque Fernandez, Murilo Ponciano Emim, Bruno Apolo Miranda Figueira, Nayara Aparecida Fonseca Couto
Format: Article
Language:English
Published: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) 2025-06-01
Series:Materials Research
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Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392025000200227&lng=en&tlng=en
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author Elaine Cristina Lima de Melo
Oscar Jesus Choque Fernandez
Murilo Ponciano Emim
Bruno Apolo Miranda Figueira
Nayara Aparecida Fonseca Couto
author_facet Elaine Cristina Lima de Melo
Oscar Jesus Choque Fernandez
Murilo Ponciano Emim
Bruno Apolo Miranda Figueira
Nayara Aparecida Fonseca Couto
author_sort Elaine Cristina Lima de Melo
collection DOAJ
description The beneficiation of bauxite ore generates significant quantities of tailings, primarily composed of kaolinite and residual gibbsite, the latter still amenable to metallurgical recovery. In this study, bauxite tailings were reprocessed based on particle size classification from 30 µm to 2 µm, obtained by sedimentation. The resulting fractions consisted mainly of fine to ultrafine particles, comprising approximately 80%. These fractions contained gibbsite and kaolinite as the dominant mineral phases, in varying proportions. Chemically, Al2O3 and SiO2 were the major components, with a progressive reduction in Al2O3 and a corresponding increase in SiO2 as particle size decreased. This trend was confirmed by an increasing SiO2/Al2O3 ratio, indicating silica enrichment attributed to kaolinite and alumina depletion associated with gibbsite. The results suggest that gibbsite remains recoverable even in finer fractions, while kaolinite becomes progressively liberated. This behavior supports the potential for reprocessing tailings only to fines particles and reducing the reactive silica.
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issn 1516-1439
language English
publishDate 2025-06-01
publisher Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
record_format Article
series Materials Research
spelling doaj-art-d1487733155a4e25bcbc3669c8958ff42025-08-20T03:10:57ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392025-06-0128suppl 110.1590/1980-5373-mr-2025-0076Granulometric Separation of Bauxite Tailings to Metallurgical ProcessingElaine Cristina Lima de Melohttps://orcid.org/0009-0008-4083-7485Oscar Jesus Choque Fernandezhttps://orcid.org/0000-0003-4975-5992Murilo Ponciano Emimhttps://orcid.org/0009-0004-5446-4035Bruno Apolo Miranda Figueirahttps://orcid.org/0000-0002-0507-8662Nayara Aparecida Fonseca Coutohttps://orcid.org/0009-0000-3737-2332The beneficiation of bauxite ore generates significant quantities of tailings, primarily composed of kaolinite and residual gibbsite, the latter still amenable to metallurgical recovery. In this study, bauxite tailings were reprocessed based on particle size classification from 30 µm to 2 µm, obtained by sedimentation. The resulting fractions consisted mainly of fine to ultrafine particles, comprising approximately 80%. These fractions contained gibbsite and kaolinite as the dominant mineral phases, in varying proportions. Chemically, Al2O3 and SiO2 were the major components, with a progressive reduction in Al2O3 and a corresponding increase in SiO2 as particle size decreased. This trend was confirmed by an increasing SiO2/Al2O3 ratio, indicating silica enrichment attributed to kaolinite and alumina depletion associated with gibbsite. The results suggest that gibbsite remains recoverable even in finer fractions, while kaolinite becomes progressively liberated. This behavior supports the potential for reprocessing tailings only to fines particles and reducing the reactive silica.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392025000200227&lng=en&tlng=enGibbsiteKaoliniteCharacterizationGranulometryProcessing
spellingShingle Elaine Cristina Lima de Melo
Oscar Jesus Choque Fernandez
Murilo Ponciano Emim
Bruno Apolo Miranda Figueira
Nayara Aparecida Fonseca Couto
Granulometric Separation of Bauxite Tailings to Metallurgical Processing
Materials Research
Gibbsite
Kaolinite
Characterization
Granulometry
Processing
title Granulometric Separation of Bauxite Tailings to Metallurgical Processing
title_full Granulometric Separation of Bauxite Tailings to Metallurgical Processing
title_fullStr Granulometric Separation of Bauxite Tailings to Metallurgical Processing
title_full_unstemmed Granulometric Separation of Bauxite Tailings to Metallurgical Processing
title_short Granulometric Separation of Bauxite Tailings to Metallurgical Processing
title_sort granulometric separation of bauxite tailings to metallurgical processing
topic Gibbsite
Kaolinite
Characterization
Granulometry
Processing
url http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392025000200227&lng=en&tlng=en
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AT oscarjesuschoquefernandez granulometricseparationofbauxitetailingstometallurgicalprocessing
AT muriloponcianoemim granulometricseparationofbauxitetailingstometallurgicalprocessing
AT brunoapolomirandafigueira granulometricseparationofbauxitetailingstometallurgicalprocessing
AT nayaraaparecidafonsecacouto granulometricseparationofbauxitetailingstometallurgicalprocessing