Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid
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...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Cerâmica
2013-06-01
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| Series: | Cerâmica |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132013000200019&lng=en&tlng=en |
| _version_ | 1818949758418419712 |
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| author | C. Ocampo-López M. E. Ramírez-Carmona E. Vélez-Ortiz |
| author_facet | C. Ocampo-López M. E. Ramírez-Carmona E. Vélez-Ortiz |
| author_sort | C. Ocampo-López |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-20T09:07:47Z |
| format | Article |
| id | doaj.art-a416c0a3e4d04da3af05c4e4c8eb257c |
| institution | Directory Open Access Journal |
| issn | 1678-4553 |
| language | English |
| last_indexed | 2024-12-20T09:07:47Z |
| publishDate | 2013-06-01 |
| publisher | Associação Brasileira de Cerâmica |
| record_format | Article |
| series | Cerâmica |
| spelling | doaj.art-a416c0a3e4d04da3af05c4e4c8eb257c2022-12-21T19:45:40ZengAssociação Brasileira de CerâmicaCerâmica1678-45532013-06-015935032633010.1590/S0366-69132013000200019S0366-69132013000200019Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acidC. Ocampo-López0M. E. Ramírez-Carmona1E. Vélez-Ortiz2Pontificia Universidad BolivarianaPontificia Universidad BolivarianaPontificia Universidad BolivarianaThe 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132013000200019&lng=en&tlng=encaulimremoção de ferroestudo termodinâmicoácidos orgânicos |
| spellingShingle | C. Ocampo-López M. E. Ramírez-Carmona E. Vélez-Ortiz Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid Cerâmica caulim remoção de ferro estudo termodinâmico ácidos orgânicos |
| title | 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_short | 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 |
| topic | caulim remoção de ferro estudo termodinâmico ácidos orgânicos |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132013000200019&lng=en&tlng=en |
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