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 additiПоказать полностьюon 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