Aluminium Recycling in Single- and Multiple-Capillary Laboratory Electrolysis Cells
This work is a contribution to the approach for Al purification and extraction from scrap using the thin-layer multiple-capillary molten salt electrochemical system. The single- and multiple-capillary cells were designed and used to study the kinetics of aluminium reduction in LiF–AlF<sub>3<...
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MDPI AG
2021-06-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/7/1053 |
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| author | Andrey Yasinskiy Sai Krishna Padamata Ilya Moiseenko Srecko Stopic Dominic Feldhaus Bernd Friedrich Peter Polyakov |
| author_facet | Andrey Yasinskiy Sai Krishna Padamata Ilya Moiseenko Srecko Stopic Dominic Feldhaus Bernd Friedrich Peter Polyakov |
| author_sort | Andrey Yasinskiy |
| collection | DOAJ |
| description | This work is a contribution to the approach for Al purification and extraction from scrap using the thin-layer multiple-capillary molten salt electrochemical system. The single- and multiple-capillary cells were designed and used to study the kinetics of aluminium reduction in LiF–AlF<sub>3</sub> and equimolar NaCl–KCl with 10 wt.% AlF<sub>3</sub> addition at 720–850 °C. The cathodic process on the vertical liquid aluminium electrode in NaCl–KCl (+10 wt.% AlF<sub>3</sub>) in the 2.5 mm length capillary had mixed kinetics with signs of both diffusion and chemical reaction control. The apparent mass transport coefficient changed from 5.6∙10<sup>−3</sup> cm.s<sup>−1</sup> to 13.1∙10<sup>−3</sup> cm.s<sup>−1</sup> in the mentioned temperature range. The dependence between the mass transport coefficient and temperature follows an Arrhenius-type behaviour with an activation energy equal to 60.5 kJ.mol<sup>−1</sup>. In the multiple-capillary laboratory electrolysis cell, galvanostatic electrolysis in a 64LiF–36AlF<sub>3</sub> melt showed that the electrochemical refinery can be performed at a current density of 1 A.cm<sup>−2</sup> or higher with a total voltage drop of around 2.0 V and specific energy consumption of about 6–7 kWh.kg<sup>−1</sup>. The resistance fluctuated between 0.9 and 1.4 Ω during the electrolysis depending on the current density. Thin-layer aluminium recycling and refinery seems to be a promising approach capable of producing high-purity aluminium with low specific energy consumption. |
| first_indexed | 2024-03-10T09:55:12Z |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T09:55:12Z |
| publishDate | 2021-06-01 |
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| series | Metals |
| spelling | doaj.art-d85a6d75eae84d738f76c86f33a53ca02023-11-22T02:25:11ZengMDPI AGMetals2075-47012021-06-01117105310.3390/met11071053Aluminium Recycling in Single- and Multiple-Capillary Laboratory Electrolysis CellsAndrey Yasinskiy0Sai Krishna Padamata1Ilya Moiseenko2Srecko Stopic3Dominic Feldhaus4Bernd Friedrich5Peter Polyakov6Laboratory of Physics and Chemistry of Metallurgical Processes and Materials, Siberian Federal University, Krasnoiarskii rabochii 95, 600025 Krasnoyarsk, RussiaLaboratory of Physics and Chemistry of Metallurgical Processes and Materials, Siberian Federal University, Krasnoiarskii rabochii 95, 600025 Krasnoyarsk, RussiaLaboratory of Physics and Chemistry of Metallurgical Processes and Materials, Siberian Federal University, Krasnoiarskii rabochii 95, 600025 Krasnoyarsk, RussiaIME Process Metallurgy and Metal Recycling, RWTH Aachen University, Intzestraße 3, 52056 Aachen, GermanyIME Process Metallurgy and Metal Recycling, RWTH Aachen University, Intzestraße 3, 52056 Aachen, GermanyIME Process Metallurgy and Metal Recycling, RWTH Aachen University, Intzestraße 3, 52056 Aachen, GermanyLaboratory of Physics and Chemistry of Metallurgical Processes and Materials, Siberian Federal University, Krasnoiarskii rabochii 95, 600025 Krasnoyarsk, RussiaThis work is a contribution to the approach for Al purification and extraction from scrap using the thin-layer multiple-capillary molten salt electrochemical system. The single- and multiple-capillary cells were designed and used to study the kinetics of aluminium reduction in LiF–AlF<sub>3</sub> and equimolar NaCl–KCl with 10 wt.% AlF<sub>3</sub> addition at 720–850 °C. The cathodic process on the vertical liquid aluminium electrode in NaCl–KCl (+10 wt.% AlF<sub>3</sub>) in the 2.5 mm length capillary had mixed kinetics with signs of both diffusion and chemical reaction control. The apparent mass transport coefficient changed from 5.6∙10<sup>−3</sup> cm.s<sup>−1</sup> to 13.1∙10<sup>−3</sup> cm.s<sup>−1</sup> in the mentioned temperature range. The dependence between the mass transport coefficient and temperature follows an Arrhenius-type behaviour with an activation energy equal to 60.5 kJ.mol<sup>−1</sup>. In the multiple-capillary laboratory electrolysis cell, galvanostatic electrolysis in a 64LiF–36AlF<sub>3</sub> melt showed that the electrochemical refinery can be performed at a current density of 1 A.cm<sup>−2</sup> or higher with a total voltage drop of around 2.0 V and specific energy consumption of about 6–7 kWh.kg<sup>−1</sup>. The resistance fluctuated between 0.9 and 1.4 Ω during the electrolysis depending on the current density. Thin-layer aluminium recycling and refinery seems to be a promising approach capable of producing high-purity aluminium with low specific energy consumption.https://www.mdpi.com/2075-4701/11/7/1053aluminiumthin-layer electrolysismolten saltshalidescapillary cell |
| spellingShingle | Andrey Yasinskiy Sai Krishna Padamata Ilya Moiseenko Srecko Stopic Dominic Feldhaus Bernd Friedrich Peter Polyakov Aluminium Recycling in Single- and Multiple-Capillary Laboratory Electrolysis Cells Metals aluminium thin-layer electrolysis molten salts halides capillary cell |
| title | Aluminium Recycling in Single- and Multiple-Capillary Laboratory Electrolysis Cells |
| title_full | Aluminium Recycling in Single- and Multiple-Capillary Laboratory Electrolysis Cells |
| title_fullStr | Aluminium Recycling in Single- and Multiple-Capillary Laboratory Electrolysis Cells |
| title_full_unstemmed | Aluminium Recycling in Single- and Multiple-Capillary Laboratory Electrolysis Cells |
| title_short | Aluminium Recycling in Single- and Multiple-Capillary Laboratory Electrolysis Cells |
| title_sort | aluminium recycling in single and multiple capillary laboratory electrolysis cells |
| topic | aluminium thin-layer electrolysis molten salts halides capillary cell |
| url | https://www.mdpi.com/2075-4701/11/7/1053 |
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