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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Aluminum Reduction Technology
Presentation Title Electrochemical Reduction and Dissolution of Aluminium in a Thin-layer Refinery Process
Author(s) Andrey Yasinskiy, Peter Polyakov, Ilya Moiseenko, Sai Krishna Padamata
On-Site Speaker (Planned) Andrey Yasinskiy
Abstract Scope The liquid metals refining industry has a demand for new technologies operated at low energy consumption and environmental impact nowadays. This work addresses an approach for Al purification and extraction from scrap in a thin layer of the multiple-capillary molten salt electrochemical system. The two types of single-capillary cells with quasi-reference electrodes were used to study the kinetics of aluminium reduction and dissolution in a narrow (Ø x length) 1x1 and 1x5 mm channel filled with liquid LiF-AlF3 or equimolar NaCl-KCl with the AlF3 addition at 850 °C. A multiple-capillary Al refinery process can be designed to significantly reduce the specific energy consumption. The new refinery process can be performed at high current densities. The single capillary electrolysis can be used for kinetics studies. Thin-layer cells should be operated at a thickness no more than 5 mm to compensate the high resistance which may vary in the range from 0.7 to 2.5 Ω at this capillary length. The 64LiF-36AlF3 melt can be used as an electrolyte for the thin-layer electrolysis due to the high electrical conductivity, the wide potential window between Al and Li reduction and the low liquidus temperature.
Proceedings Inclusion? Planned: Light Metals
Keywords Aluminum, Electrometallurgy, Recycling and Secondary Recovery


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