Microporosity of BIF hosted massive hematite ore, Iron Quadrangle, Brazil
Autor(a) principal: | |
---|---|
Data de Publicação: | 2002 |
Outros Autores: | , , |
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). |
id |
ABC-1_f4fb960c06bf21d5b5e194f54b646047 |
---|---|
oai_identifier_str |
oai:scielo:S0001-37652002000100008 |
network_acronym_str |
ABC-1 |
network_name_str |
Anais da Academia Brasileira de Ciências (Online) |
repository_id_str |
|
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 |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100008 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100008 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0001-37652002000100008 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
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) instname:Academia Brasileira de Ciências (ABC) instacron:ABC |
instname_str |
Academia Brasileira de Ciências (ABC) |
instacron_str |
ABC |
institution |
ABC |
reponame_str |
Anais da Academia Brasileira de Ciências (Online) |
collection |
Anais da Academia Brasileira de Ciências (Online) |
repository.name.fl_str_mv |
Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC) |
repository.mail.fl_str_mv |
||aabc@abc.org.br |
_version_ |
1754302855744847872 |