Estudio del proceso de calcinación en dos minerales de hierro limoníticos entre 250 °C y 950 °C

Lisbeth Longa-Avello; Cristina Pereyra-Zerpa; Julio Andrés Casal-Ramos; Pedro Delvasto

doi:10.19053/01211129.v26.n45.2017.6053

Authors

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). http://orcid.org/0000-0001-5602-7921

DOI:

https://doi.org/10.19053/01211129.v26.n45.2017.6053

Keywords:

Iron Ore, Limonite, Thermal Modification of Minerals

Abstract

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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