Study of the calcination process of two limonitic iron ores between 250 °C and 950 °C


  • Lisbeth Longa-Avello Universidad Simón Bolívar (Caracas, Venezuela).
  • Cristina Pereyra-Zerpa Universidad Simón Bolívar (Caracas, Venezuela).
  • Julio Andrés Casal-Ramos Universidad Simón Bolívar (Caracas, Venezuela).
  • Pedro Delvasto Universidad Industrial de Santander (Bucaramanga-Santander, Colombia).



Iron Ore, Limonite, Thermal Modification of Minerals


The dehydration process of two limonitic ores from Venezuela was studied between 250 °C and 950 °C by means of thermogravimetry, infrared spectroscopy, and x-ray diffraction. These techniques indicated for both minerals that the goethite-to-hematite transformation occurred in the range of 250-350 °C. In addition, the x-ray diffraction showed a structural re-arrangement within the orebody above 350 °C, temperature above which only the hematite structure is recognizable. Finally, infrared spectroscopy revealed that such transformation implies the loss of structural OH- functional groups, characteristic of the limonite.


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How to Cite

Longa-Avello, L., Pereyra-Zerpa, C., Casal-Ramos, J. A., & Delvasto, P. (2017). Study of the calcination process of two limonitic iron ores between 250 °C and 950 °C. Revista Facultad De Ingeniería, 26(45), 33–45.