Resumo

LONGA-AVELLO, Lisbeth; PEREYRA-ZERPA, Cristina; CASAL-RAMOS, Julio Andrés  e  DELVASTO, Pedro. Study of the calcination process of two limonitic iron ores between 250 °C and 950 °C. Rev. Fac. ing. [online]. 2017, vol.26, n.45, pp.33-45. ISSN 0121-1129.  https://doi.org/10.19053/01211129.v26.n45.2017.6053.

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.

Palavras-chave : Iron Ore; Limonite; Thermal Modification of Minerals.

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