Journal of Materials Science

, Volume 30, Issue 20, pp 5130–5138 | Cite as

Thermal decomposition of ferric and ammonium sulphates obtained by bio-oxidation of water pickling liquors with Thiobacillus ferrooxidans

  • A. Lopez-Delgado
  • F. A. Lopez


Sulphuric water pickling liquor containing ferrous sulphates was oxidized by Thiobacillus ferrooxidans at different pHs. The oxidized solution was then evaporated and crystallized, and products characterized by X-ray powder diffraction, X-ray high temperature powder diffraction and Fourier transform infrared (FTIR) spectrometry. The thermal decomposition of these materials, studied by calorimetric and thermogravimetric techniques, shows that iron(III) hydroxysalts and monoammonium and triammonium salts are formed during the oxidation-evaporation-crystallization process. However, this formation depends upon pH.


Iron Polymer Fourier Fourier Transform Thermal Decomposition 
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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • A. Lopez-Delgado
    • 1
  • F. A. Lopez
    • 1
  1. 1.Department of Materials RecyclingNational Center of Metallurgical Research(CSIC), AvdaMadridSpain

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