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The application of thermal solar energy to high temperature processes: Case study of the synthesis of alumina from boehmite

AutorPadilla, Isabel; López-Delgado, Aurora ; López-Andrés, Sol; Alvarez, M.; Galindo, R.; Vázquez, A. J.
Palabras claveBoehmite
Solar energy
Synthesis alumina
Fecha de publicación2014
EditorHindawi Publishing Corporation
CitaciónThe Scientific World Journal 2014 (ID 825745, 2014)
ResumenThe aim of this paper is to evaluate the feasibility of obtaining alumina from boehmite using a free, clean, and unlimited power source as the solar energy. Boehmite was obtained by hydrothermal treatment of a hazardous waste coming from aluminum slag milling. The waste is considered as a hazardous substance because of it releasing toxic gases (hydrogen, ammonia, methane, and hydrogen sulfide) in the presence of water. The as-obtained boehmite was transformed into alumina, in air atmosphere, using a solar energy concentrator (Fresnel lens). The solar installation provides a power density of 260 W·cm-2 which allows reaching temperatures upper than 1000°C at few minutes of exposure. Tests were performed at different periods of time that ranged between 5 and 90 min. The percentage of transformation of boehmite into alumina was followed by the water content of samples after solar radiation exposure. Samples were characterized by X-ray diffraction, infrared spectroscopy, and thermogravimetry. Metastable aluminas started to appear at 5 min and the crystalline and stable phase corundum at 10 min of solar radiation exposure. © 2014 Isabel Padilla et al.
Identificadoresdoi: 10.1155/2014/825745
issn: 1537-744X
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