Estudio in-situ de la transformación térmica de limonita utilizada como pigmento procedente de Perú

P. Romero-Gómez, J. C. González, A. Bustamante, A. Ruiz-Conde, P. J. Sánchez-Soto

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

14 Citas (Scopus)

Resumen

It has been performed a kinetic study of the thermal transformation of Limonite [FeO(OH).nH2O] by thermal gravimetric analysis (TGA), thermal X-ray Diffraction (XRD) and μ-Raman spectroscopy. The mineral was extracted from the Taraco District, Huancané Province, Puno region (Peru). Powdered XRD identify goethite phase as the main mineralogical component besides quartz. It was subjected to in-situ thermal treatment in the range of temperatures 100 to 500 °C in air and an inert atmosphere (nitrogen). The goethite phase remains stable from room temperature until 200 °C. From 250 °C there is a phase transformation α-FeO(OH) → α-Fe2O3 with 8 wt % weight loss and a chromatic change, i.e., the change of the hydroxylated goethite phase (yellow) to oxided hematite phase (red), as evidenced by the TGA and evolution of the XRD profiles. Moreover, the μ-Raman spectra of the in-situ thermal treatment corroborate that there is a transition at 290 °C by the transformation of the characteristic Raman bands of the goethite to hematite phase, in the frequency range from 200 to 1800cm-1.

Título traducido de la contribuciónStudy of the in-situ thermal transformations of Limonite used as pigment coming from Peru
Idioma originalEspañol
Páginas (desde-hasta)127-131
Número de páginas5
PublicaciónBoletin de la Sociedad Espanola de Ceramica y Vidrio
Volumen52
N.º3
DOI
EstadoPublicada - may. 2013
Publicado de forma externa

Palabras clave

  • μ-Raman spectroscopy
  • Goethite
  • Haematite
  • Limonite
  • Thermal gravimetric analysis (TGA)
  • Thermal XRD

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