Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/105878
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Type: | Journal article |
Title: | Solar-driven alumina calcination for CO₂ mitigation and improved product quality |
Other Titles: | Solar-driven alumina calcination for CO(2) mitigation and improved product quality |
Author: | Davis, D. Müller, F. Saw, W. Steinfeld, A. Nathan, G. |
Citation: | Green Chemistry, 2017; 19(13):2992-3005 |
Publisher: | Royal Society of Chemistry |
Issue Date: | 2017 |
ISSN: | 1463-9262 1463-9270 |
Statement of Responsibility: | Dominic Davis, Fabian Müller, Woei L. Saw, Aldo Steinfeld and Graham J. Nathan |
Abstract: | We report on the first-of-a-kind experimental demonstration of the calcination of alumina with concentrated solar thermal (CST) radiation at radiative fluxes up to 2190 suns using a 5 kW novel solar transport reactor. Aluminium hydroxide was calcined at nominal reactor temperatures over the range 1160–1550 K to yield chemical conversions of up to 95.8% for nominal residence times of approximately 3 s. Solar energy conversion efficiencies of up to 20.4% were achieved. The mean pore diameter and specific surface area of the solar-generated alumina with the greatest chemical conversion were 5.8 nm and 132.7 m² g⁻¹, respectively, which are higher values than are typical for industrial alumina production. In addition, the product is dominated by the γ-phase, which is desirable for the downstream processing to aluminium. This suggests that CST can improve the quality of alumina over existing fossil fuel based processes though a combination of a high heating rate and avoided contamination by combustion products. Furthermore, the solar-driven process has the potential to avoid the discharge of combustion-derived CO₂ emissions for the calcination stage of the conventional Bayer process, which is typically 165 kg-CO₂ per tonne-alumina. |
Description: | Accepted 10th May 2017 |
Rights: | This journal is © The Royal Society of Chemistry 2017. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. |
DOI: | 10.1039/C7GC00585G |
Grant ID: | 731287 16.0183 1-USO034 http://purl.org/au-research/grants/arc/DP150102230 |
Published version: | http://dx.doi.org/10.1039/c7gc00585g |
Appears in Collections: | Aurora harvest 8 Chemical Engineering publications |
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hdl_105878.pdf | Published version | 3.77 MB | Adobe PDF | View/Open |
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