The Application of Thermal Solar Energy to High Temperature Processes: Case Study of the Synthesis of Alumina from Boehmite
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...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/825745 |
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| author | Isabel Padilla Aurora López-Delgado Sol López-Andrés Marta Álvarez Roberto Galindo Alfonso J. Vazquez-Vaamonde |
| author_facet | Isabel Padilla Aurora López-Delgado Sol López-Andrés Marta Álvarez Roberto Galindo Alfonso J. Vazquez-Vaamonde |
| author_sort | Isabel Padilla |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-0b3dfb32030c4cd7a8a5163e2ff22a44 |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-0b3dfb32030c4cd7a8a5163e2ff22a442025-02-03T05:46:48ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/825745825745The Application of Thermal Solar Energy to High Temperature Processes: Case Study of the Synthesis of Alumina from BoehmiteIsabel Padilla0Aurora López-Delgado1Sol López-Andrés2Marta Álvarez3Roberto Galindo4Alfonso J. Vazquez-Vaamonde5Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avenida Gregorio del Amo 8, 28040 Madrid, SpainCentro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avenida Gregorio del Amo 8, 28040 Madrid, SpainDepartamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, UCM, C/Antonio Nováis, 28040 Madrid, SpainDepartamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, UCM, C/Antonio Nováis, 28040 Madrid, SpainCentro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avenida Gregorio del Amo 8, 28040 Madrid, SpainCentro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avenida Gregorio del Amo 8, 28040 Madrid, SpainThe 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.http://dx.doi.org/10.1155/2014/825745 |
| spellingShingle | Isabel Padilla Aurora López-Delgado Sol López-Andrés Marta Álvarez Roberto Galindo Alfonso J. Vazquez-Vaamonde The Application of Thermal Solar Energy to High Temperature Processes: Case Study of the Synthesis of Alumina from Boehmite The Scientific World Journal |
| title | The Application of Thermal Solar Energy to High Temperature Processes: Case Study of the Synthesis of Alumina from Boehmite |
| title_full | The Application of Thermal Solar Energy to High Temperature Processes: Case Study of the Synthesis of Alumina from Boehmite |
| title_fullStr | The Application of Thermal Solar Energy to High Temperature Processes: Case Study of the Synthesis of Alumina from Boehmite |
| title_full_unstemmed | The Application of Thermal Solar Energy to High Temperature Processes: Case Study of the Synthesis of Alumina from Boehmite |
| title_short | The Application of Thermal Solar Energy to High Temperature Processes: Case Study of the Synthesis of Alumina from Boehmite |
| title_sort | application of thermal solar energy to high temperature processes case study of the synthesis of alumina from boehmite |
| url | http://dx.doi.org/10.1155/2014/825745 |
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