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Vol. 26 Núm. 45 (2017)

Articulos

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

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

Publicado 2017-05-02

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).

Resumen

Se estudió el proceso de deshidratación de dos minerales limoníticos de Venezuela entre 250 °C y 950 °C, usando termogravimetría, espectroscopia infrarroja y difracción de rayos x. Para ambos materiales, estas técnicas indicaron que la transformación de goethita a hematita ocurrió en el rango de 250 °C a 350 °C. Adicionalmente, la difracción de rayos X mostró un rearreglo estructural dentro del yacimiento mineral a una temperatura por encima de 350 °C; a temperaturas mayores, solo se reconoce la estructura de la hematita. Finalmente, la espectroscopia infrarroja reveló que la transformación de goethita a hematita implica la pérdida de grupos funcionales de OH- estructural característicos de la limonita.

Palabras clave

Limonita, Mineral de hierro, Modificación térmica de minerales

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Citas

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