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

    Research output: Contribution to journalArticle in an indexed scientific journalpeer-review

    7 Scopus citations


    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 languageEnglish
    Pages (from-to)326-330
    Number of pages5
    Issue number350
    StatePublished - Apr 2013


    • Iron removal
    • Kaolin
    • Organic acids
    • Thermodynamic study


    Dive into the research topics of 'Thermodynamic analysis of stability in iron removal from kaolin by using oxalic acid'. Together they form a unique fingerprint.

    Cite this