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Título: | The application of thermal solar energy to high temperature processes: Case study of the synthesis of alumina from boehmite |
Autor: | Padilla, Isabel CSIC ORCID ; López-Delgado, Aurora CSIC ORCID ; López-Andrés, Sol; Álvarez, M.; Galindo, R. CSIC ORCID; Vázquez, Alfonso J. | Palabras clave: | Boehmite Solar energy Synthesis alumina |
Fecha de publicación: | 2014 | Editor: | Hindawi Publishing Corporation | Citación: | The Scientific World Journal 2014 (ID 825745, 2014) | Resumen: | The 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. | URI: | http://hdl.handle.net/10261/102550 | DOI: | 10.1155/2014/825745 | Identificadores: | doi: 10.1155/2014/825745 issn: 1537-744X |
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The Application of Thermal.pdf | 1,28 MB | Adobe PDF | Visualizar/Abrir |
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