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

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

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...

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Bibliographic Details
Main Authors: Longa-Avello, Lisbeth, Pereyra-Zerpa, Cristina, Casal-Ramos, Julio Andrés, Delvasto, Pedro
Format: Online
Language:eng
Published: Universidad Pedagógica y Tecnológica de Colombia 2017
Subjects:
Iron Ore
Limonite
Thermal Modification of Minerals
Limonita
Mineral de hierro
Modificación térmica de minerales
Online Access:https://revistas.uptc.edu.co/index.php/ingenieria/article/view/6053
Description
Summary: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.