Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil

Detalhes bibliográficos
Autor(a) principal: VARAJÃO,CÉSAR A.C.
Data de Publicação: 2002
Outros Autores: BRUAND,ARY, RAMANAIDOU,ERICK R., GILKES,ROBERT J.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Anais da Academia Brasileira de Ciências (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100008
Resumo: Massive hematite ore (MHO) is a special high-grade iron ore, used as lump ore in the process of obtaining direct reduction iron (DRI). The influence of porosity on the reducibility of MHO from the Capitão do Mato Mine (Iron Quadrangle, Brazil) was investigated using optical and scanning electron microscopes on drill core and open pit samples. Hematite is the main component of the samples and occurs as granular crystals (10 mum), microplates (1 mum) and euhedral martite (10 to 30 mum). Quartz, maghemite, kenomagnetite and goethite are minor components. Primary micropores (Å to 1 mum) are associated with microplaty crystals that fill cavities between granular hematite. Secondary micropores (Å to 5 mum) related to euhedral martite crystals, are the most important. The total porosity of weathered samples, measured using nitrogen adsorption and mercury injection, attains values up to 11%, whereas unweathered samples have a porosity less than 2.5%. Reducibility is strongly enhanced by porosity, but inhibited by structure (bedding).
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spelling Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, BrazilBIFporositymassive hematite oredirect reduction ironreducibilityMassive hematite ore (MHO) is a special high-grade iron ore, used as lump ore in the process of obtaining direct reduction iron (DRI). The influence of porosity on the reducibility of MHO from the Capitão do Mato Mine (Iron Quadrangle, Brazil) was investigated using optical and scanning electron microscopes on drill core and open pit samples. Hematite is the main component of the samples and occurs as granular crystals (10 mum), microplates (1 mum) and euhedral martite (10 to 30 mum). Quartz, maghemite, kenomagnetite and goethite are minor components. Primary micropores (Å to 1 mum) are associated with microplaty crystals that fill cavities between granular hematite. Secondary micropores (Å to 5 mum) related to euhedral martite crystals, are the most important. The total porosity of weathered samples, measured using nitrogen adsorption and mercury injection, attains values up to 11%, whereas unweathered samples have a porosity less than 2.5%. Reducibility is strongly enhanced by porosity, but inhibited by structure (bedding).Academia Brasileira de Ciências2002-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100008Anais da Academia Brasileira de Ciências v.74 n.1 2002reponame:Anais da Academia Brasileira de Ciências (Online)instname:Academia Brasileira de Ciências (ABC)instacron:ABC10.1590/S0001-37652002000100008info:eu-repo/semantics/openAccessVARAJÃO,CÉSAR A.C.BRUAND,ARYRAMANAIDOU,ERICK R.GILKES,ROBERT J.eng2002-05-24T00:00:00Zoai:scielo:S0001-37652002000100008Revistahttp://www.scielo.br/aabchttps://old.scielo.br/oai/scielo-oai.php||aabc@abc.org.br1678-26900001-3765opendoar:2002-05-24T00:00Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)false
dc.title.none.fl_str_mv Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil
title Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil
spellingShingle Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil
VARAJÃO,CÉSAR A.C.
BIF
porosity
massive hematite ore
direct reduction iron
reducibility
title_short Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil
title_full Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil
title_fullStr Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil
title_full_unstemmed Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil
title_sort Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil
author VARAJÃO,CÉSAR A.C.
author_facet VARAJÃO,CÉSAR A.C.
BRUAND,ARY
RAMANAIDOU,ERICK R.
GILKES,ROBERT J.
author_role author
author2 BRUAND,ARY
RAMANAIDOU,ERICK R.
GILKES,ROBERT J.
author2_role author
author
author
dc.contributor.author.fl_str_mv VARAJÃO,CÉSAR A.C.
BRUAND,ARY
RAMANAIDOU,ERICK R.
GILKES,ROBERT J.
dc.subject.por.fl_str_mv BIF
porosity
massive hematite ore
direct reduction iron
reducibility
topic BIF
porosity
massive hematite ore
direct reduction iron
reducibility
description Massive hematite ore (MHO) is a special high-grade iron ore, used as lump ore in the process of obtaining direct reduction iron (DRI). The influence of porosity on the reducibility of MHO from the Capitão do Mato Mine (Iron Quadrangle, Brazil) was investigated using optical and scanning electron microscopes on drill core and open pit samples. Hematite is the main component of the samples and occurs as granular crystals (10 mum), microplates (1 mum) and euhedral martite (10 to 30 mum). Quartz, maghemite, kenomagnetite and goethite are minor components. Primary micropores (Å to 1 mum) are associated with microplaty crystals that fill cavities between granular hematite. Secondary micropores (Å to 5 mum) related to euhedral martite crystals, are the most important. The total porosity of weathered samples, measured using nitrogen adsorption and mercury injection, attains values up to 11%, whereas unweathered samples have a porosity less than 2.5%. Reducibility is strongly enhanced by porosity, but inhibited by structure (bedding).
publishDate 2002
dc.date.none.fl_str_mv 2002-03-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100008
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dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0001-37652002000100008
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dc.publisher.none.fl_str_mv Academia Brasileira de Ciências
publisher.none.fl_str_mv Academia Brasileira de Ciências
dc.source.none.fl_str_mv Anais da Academia Brasileira de Ciências v.74 n.1 2002
reponame:Anais da Academia Brasileira de Ciências (Online)
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