Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.3390/met11071053

Ключевые слова: aluminium, capillary cell, halides, molten salts, thin-layer electrolysis

Аннотация: 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–AlF3 and equimolar NaCl–KCl with 10 wt.% AlF3 addition at 720–850◦C. The cathodic process on the vertical liquid aluminium electrode in NaCl–KCl (+10 wt.% AlF3) 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 5.6·10−3 cm.s−1 to 13.1·10−3 cm.s−1 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 J.mol−1. In the multiple-capillary laboratory electrolysis cell, galvanostatic electrolysis in a 64LiF–36AlF3 melt showed that the electrochemical refinery can be performed at a current density of 1 A.cm−2 or higher with a total voltage drop of around 2.0 V and specific energy consumption of about 6–7 kW.kg−1 . 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. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Журнал: Metals

Выпуск журнала: Vol. 11, Is. 7

Номера страниц: 1053

ISSN журнала: 20754701

Издатель: MDPI AG

• Yasinskiy Andrey (Siberian Fed Univ, Lab Phys & Chem Met Proc & Mat, Krasnoiarskii Rabochii 95, Krasnoyarsk 600025, Russia; Rhein Westfal TH Aachen, IME Proc Met & Met Recycling, Intzestr 3, D-52056 Aachen, Germany)
• Padamata Sai Krishna (Siberian Fed Univ, Lab Phys & Chem Met Proc & Mat, Krasnoiarskii Rabochii 95, Krasnoyarsk 600025, Russia)
• Moiseenko Ilya (Siberian Fed Univ, Lab Phys & Chem Met Proc & Mat, Krasnoiarskii Rabochii 95, Krasnoyarsk 600025, Russia)
• Stopic Srecko (Rhein Westfal TH Aachen, IME Proc Met & Met Recycling, Intzestr 3, D-52056 Aachen, Germany)
• Feldhaus Dominic (Rhein Westfal TH Aachen, IME Proc Met & Met Recycling, Intzestr 3, D-52056 Aachen, Germany)
• Friedrich Bernd (Rhein Westfal TH Aachen, IME Proc Met & Met Recycling, Intzestr 3, D-52056 Aachen, Germany)
• Polyakov Peter (Siberian Fed Univ, Lab Phys & Chem Met Proc & Mat, Krasnoiarskii Rabochii 95, Krasnoyarsk 600025, Russia)

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