Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid

Detalhes bibliográficos
Autor(a) principal: Ocampo-López,C.
Data de Publicação: 2013
Outros Autores: Ramírez-Carmona,M. E., Vélez-Ortiz,E.
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=S0366-69132013000200019
Resumo: The graphical representation of global stability for a system, or Pourbaix diagram, was constructed to perform a thermodynamic study of iron removal from kaolin using oxalic acid as an oxidant. To do this the free energies of formation of the oxalate complex of the system were calculated, and it was found that the more stable specie is Fe(C2O4)3-3, with a calculated free energy of formation of -3753.88 kcal/mol. Thermodynamic stability functions were estimated for the system as a function of pH and Eh known as potential of oxide reduction. It was built a global stability diagram for the removal system; it showed that the specie trioxalate Fe(C2O4)3-3 is the only oxalate in equilibrium with other compounds associated with the removal of iron in kaolin.
id USP-29_83a221cf6fa7a7b640248e98b677fc0f
oai_identifier_str oai:scielo:S0366-69132013000200019
network_acronym_str USP-29
network_name_str Cerâmica (São Paulo. Online)
repository_id_str
spelling Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acidkaoliniron removalthermodynamic studyorganic acidsThe graphical representation of global stability for a system, or Pourbaix diagram, was constructed to perform a thermodynamic study of iron removal from kaolin using oxalic acid as an oxidant. To do this the free energies of formation of the oxalate complex of the system were calculated, and it was found that the more stable specie is Fe(C2O4)3-3, with a calculated free energy of formation of -3753.88 kcal/mol. Thermodynamic stability functions were estimated for the system as a function of pH and Eh known as potential of oxide reduction. It was built a global stability diagram for the removal system; it showed that the specie trioxalate Fe(C2O4)3-3 is the only oxalate in equilibrium with other compounds associated with the removal of iron in kaolin.Associação Brasileira de Cerâmica2013-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132013000200019Cerâmica v.59 n.350 2013reponame:Cerâmica (São Paulo. Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/S0366-69132013000200019info:eu-repo/semantics/openAccessOcampo-López,C.Ramírez-Carmona,M. E.Vélez-Ortiz,E.eng2013-09-23T00:00:00Zoai:scielo:S0366-69132013000200019Revistahttps://www.scielo.br/j/ce/PUBhttps://old.scielo.br/oai/scielo-oai.phpceram.abc@gmail.com||ceram.abc@gmail.com1678-45530366-6913opendoar:2013-09-23T00:00Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid
title Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid
spellingShingle Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid
Ocampo-López,C.
kaolin
iron removal
thermodynamic study
organic acids
title_short Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid
title_full Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid
title_fullStr Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid
title_full_unstemmed Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid
title_sort Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid
author Ocampo-López,C.
author_facet Ocampo-López,C.
Ramírez-Carmona,M. E.
Vélez-Ortiz,E.
author_role author
author2 Ramírez-Carmona,M. E.
Vélez-Ortiz,E.
author2_role author
author
dc.contributor.author.fl_str_mv Ocampo-López,C.
Ramírez-Carmona,M. E.
Vélez-Ortiz,E.
dc.subject.por.fl_str_mv kaolin
iron removal
thermodynamic study
organic acids
topic kaolin
iron removal
thermodynamic study
organic acids
description The graphical representation of global stability for a system, or Pourbaix diagram, was constructed to perform a thermodynamic study of iron removal from kaolin using oxalic acid as an oxidant. To do this the free energies of formation of the oxalate complex of the system were calculated, and it was found that the more stable specie is Fe(C2O4)3-3, with a calculated free energy of formation of -3753.88 kcal/mol. Thermodynamic stability functions were estimated for the system as a function of pH and Eh known as potential of oxide reduction. It was built a global stability diagram for the removal system; it showed that the specie trioxalate Fe(C2O4)3-3 is the only oxalate in equilibrium with other compounds associated with the removal of iron in kaolin.
publishDate 2013
dc.date.none.fl_str_mv 2013-06-01
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=S0366-69132013000200019
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132013000200019
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0366-69132013000200019
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.59 n.350 2013
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
_version_ 1748936782608596992

Registros relacionados