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

C. Ocampo-López; M. E. Ramírez-Carmona; E. Vélez-Ortiz

doi:10.1590/S0366-69132013000200019

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

C. Ocampo-López, M. E. Ramírez-Carmona, E. Vélez-Ortiz

Research output: Contribution to journal › Article in an indexed scientific journal › peer-review

7 Scopus citations

Abstract

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), 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(C ₂O₄) is the only oxalate in equilibrium with other compounds associated with the removal of iron in kaolin.

Original language	English
Pages (from-to)	326-330
Number of pages	5
Journal	Ceramica
Volume	59
Issue number	350
DOIs	https://doi.org/10.1590/S0366-69132013000200019
State	Published - Apr 2013

Keywords

Iron removal
Kaolin
Organic acids
Thermodynamic study

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10.1590/S0366-69132013000200019

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title = "Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid",

abstract = "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), 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(C 2O4) is the only oxalate in equilibrium with other compounds associated with the removal of iron in kaolin.",

keywords = "Iron removal, Kaolin, Organic acids, Thermodynamic study",

author = "C. Ocampo-L{\'o}pez and Ram{\'i}rez-Carmona, {M. E.} and E. V{\'e}lez-Ortiz",

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T1 - Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid

AU - Ocampo-López, C.

AU - Ramírez-Carmona, M. E.

AU - Vélez-Ortiz, E.

PY - 2013/4

Y1 - 2013/4

N2 - 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), 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(C 2O4) is the only oxalate in equilibrium with other compounds associated with the removal of iron in kaolin.

AB - 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), 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(C 2O4) is the only oxalate in equilibrium with other compounds associated with the removal of iron in kaolin.

KW - Iron removal

KW - Kaolin

KW - Organic acids

KW - Thermodynamic study

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U2 - 10.1590/S0366-69132013000200019

DO - 10.1590/S0366-69132013000200019

M3 - Artículo en revista científica indexada

AN - SCOPUS:84885054827

SN - 0366-6913

VL - 59

SP - 326

EP - 330

JO - Ceramica

JF - Ceramica

IS - 350

ER -

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

Abstract

Keywords

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