Dehydration of Gypsum Rock by Solar Energy: Preliminary Study | Zendy

Aurora LópezDelgado | Zendy; Sol López Andrés | Zendy; Isabel Padilla | Zendy; Marta Álvarez-Leal | Zendy; R. Galindo | Zendy; Alfonso Vázquez | Zendy

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Dehydration of Gypsum Rock by Solar Energy: Preliminary Study

Author(s) -

Aurora LópezDelgado,

Sol López Andrés,

Isabel Padilla,

Marta Álvarez-Leal,

R. Galindo,

Alfonso Vázquez

Publication year - 2014

Publication title -

geomaterials

Language(s) - English

Resource type - Journals

eISSN - 2161-7546

pISSN - 2161-7538

DOI - 10.4236/gm.2014.43009

Subject(s) - gypsum , anhydrite , mineralogy , profilometer , materials science , dehydration , geology , composite material , chemistry , biochemistry , surface roughness

The dehydration process of gypsum rock was studied under concentrated solar energy by using a Fresnel lens with power density of 260 Wcm-2. Temperatures higher than 700¿C were attained for 1 min of solar exposure. The effect of grain size of sample and radiation exposure time on the formation of bassanite and anhydrite was studied by XRD. The complete transformation of dihydrate into hemihydrate and/or anhydrate phases is complete for the finer size sample. Plaster composed of 92.7% of anhydrite and 7.3% of bassanite was obtained for 5 min of solar exposure. Morphological and textural modifications were followed by SEM and interferometric/confocal profilometer.Peer Reviewe

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