The Application of Thermal Solar Energy to High Temperature Processes: Case Study of the Synthesis of Alumina from Boehmite

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Padilla, Isabel and López Delgado, Aurora and López Andrés, Sol and Álvarez Aguirre, Marta and Galindo Llorach, Roberto and Vázquez Vaamonde, Alfonso J. (2014) The Application of Thermal Solar Energy to High Temperature Processes: Case Study of the Synthesis of Alumina from Boehmite. The Scientific World Journal, ID (825745). pp. 1-7. ISSN 2356-6140

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Official URL: https://www.hindawi.com/journals/tswj/2014/825745/



Abstract

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.


Item Type:Article
Uncontrolled Keywords:Solar Energy; Aluminia
Subjects:Sciences > Geology > Mineralogy
ID Code:63870
Deposited On:08 Feb 2021 08:26
Last Modified:12 Feb 2021 10:06

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