Dissolution kinetics of Amazonian metakaolin in nitric acid

Detalhes bibliográficos
Autor(a) principal: Lima,P. E. A.
Data de Publicação: 2018
Outros Autores: Angélica,R. S., Neves,R. F.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Cerâmica (São Paulo. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132018000100086
Resumo: Abstract The kinetic study of Amazon metakaolin dissolution was performed with the application of the shrinking core model for spherical and ‘flat plate’ particles with constant size. The Amazon kaolin was calcinated at 700 ºC in order to produce metakaolin. This metakaolin was leached with 5% excess nitric acid at 70, 80 and 95±3 ºC for 3 h. Samples were collected every 15 min and subjected to aluminum analysis. The acid leaching was a chemically controlled process. The spherical morphology showed better fit than the flat plate particles when taking into account the regression coefficients. 91.58 kJ/mol of activation energy was found as well as an aluminum leaching reaction of the first order. The results found in this work using 5% excess acid and Amazon kaolin were consistent with previous research results using excess acid above 50% and standard kaolin.
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spelling Dissolution kinetics of Amazonian metakaolin in nitric acidkaolinmetakaolinleachingkinetic studyAbstract The kinetic study of Amazon metakaolin dissolution was performed with the application of the shrinking core model for spherical and ‘flat plate’ particles with constant size. The Amazon kaolin was calcinated at 700 ºC in order to produce metakaolin. This metakaolin was leached with 5% excess nitric acid at 70, 80 and 95±3 ºC for 3 h. Samples were collected every 15 min and subjected to aluminum analysis. The acid leaching was a chemically controlled process. The spherical morphology showed better fit than the flat plate particles when taking into account the regression coefficients. 91.58 kJ/mol of activation energy was found as well as an aluminum leaching reaction of the first order. The results found in this work using 5% excess acid and Amazon kaolin were consistent with previous research results using excess acid above 50% and standard kaolin.Associação Brasileira de Cerâmica2018-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132018000100086Cerâmica v.64 n.369 2018reponame:Cerâmica (São Paulo. Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/0366-69132018643692179info:eu-repo/semantics/openAccessLima,P. E. A.Angélica,R. S.Neves,R. F.eng2018-01-30T00:00:00Zoai:scielo:S0366-69132018000100086Revistahttps://www.scielo.br/j/ce/PUBhttps://old.scielo.br/oai/scielo-oai.phpceram.abc@gmail.com||ceram.abc@gmail.com1678-45530366-6913opendoar:2018-01-30T00:00Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Dissolution kinetics of Amazonian metakaolin in nitric acid
title Dissolution kinetics of Amazonian metakaolin in nitric acid
spellingShingle Dissolution kinetics of Amazonian metakaolin in nitric acid
Lima,P. E. A.
kaolin
metakaolin
leaching
kinetic study
title_short Dissolution kinetics of Amazonian metakaolin in nitric acid
title_full Dissolution kinetics of Amazonian metakaolin in nitric acid
title_fullStr Dissolution kinetics of Amazonian metakaolin in nitric acid
title_full_unstemmed Dissolution kinetics of Amazonian metakaolin in nitric acid
title_sort Dissolution kinetics of Amazonian metakaolin in nitric acid
author Lima,P. E. A.
author_facet Lima,P. E. A.
Angélica,R. S.
Neves,R. F.
author_role author
author2 Angélica,R. S.
Neves,R. F.
author2_role author
author
dc.contributor.author.fl_str_mv Lima,P. E. A.
Angélica,R. S.
Neves,R. F.
dc.subject.por.fl_str_mv kaolin
metakaolin
leaching
kinetic study
topic kaolin
metakaolin
leaching
kinetic study
description Abstract The kinetic study of Amazon metakaolin dissolution was performed with the application of the shrinking core model for spherical and ‘flat plate’ particles with constant size. The Amazon kaolin was calcinated at 700 ºC in order to produce metakaolin. This metakaolin was leached with 5% excess nitric acid at 70, 80 and 95±3 ºC for 3 h. Samples were collected every 15 min and subjected to aluminum analysis. The acid leaching was a chemically controlled process. The spherical morphology showed better fit than the flat plate particles when taking into account the regression coefficients. 91.58 kJ/mol of activation energy was found as well as an aluminum leaching reaction of the first order. The results found in this work using 5% excess acid and Amazon kaolin were consistent with previous research results using excess acid above 50% and standard kaolin.
publishDate 2018
dc.date.none.fl_str_mv 2018-03-01
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=S0366-69132018000100086
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132018000100086
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/0366-69132018643692179
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 Associação Brasileira de Cerâmica
publisher.none.fl_str_mv Associação Brasileira de Cerâmica
dc.source.none.fl_str_mv Cerâmica v.64 n.369 2018
reponame:Cerâmica (São Paulo. Online)
instname:Universidade de São Paulo (USP)
instacron:USP
instname_str Universidade de São Paulo (USP)
instacron_str USP
institution USP
reponame_str Cerâmica (São Paulo. Online)
collection Cerâmica (São Paulo. Online)
repository.name.fl_str_mv Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP)
repository.mail.fl_str_mv ceram.abc@gmail.com||ceram.abc@gmail.com
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