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Dissolution of Al 2 O 3 in KF–AlF 3
Russian Metallurgy (Metally) Pub Date : 2021-03-01 , DOI: 10.1134/s0036029521020191
P. S. Pershin , A. V. Suzdaltsev , Yu. P. Zaikov

Abstract

KF–AlF3–Al2O3-based melts are promising media for the electrolytic production of aluminum in next-generation energy efficient cells. This work analyzes the dissolution of Al2O3 in the KF–AlF3 melt with a mole ratio [KF]/[AlF3] = 1.5 mol/mol at 785°C using cyclic voltammetry and the carbothermic reduction of melt samples using a LECO analyzer. The measurements are performed by a cell consisting of a carbon glass working electrode, a CO/CO2 gas reference electrode, and a graphite counter electrode. During measurements, the current response peak on voltammograms is recorded as a function of the potential scan rate, the dissolution time of the next alumina sample, and the alumina content in the melt. The current response peak is shown to linearly depend on the Al2O3 content in the melt, and the oxide dissolution rate is from 2.4 × 10–3 to 5.45 × 10–5 mol/s as a function of the oxide content in the melt. The obtained results demonstrate general possibility of operating nondestructive control of the alumina (Al2O3) content during the electrolysis of KF–AlF3–Al2O3–based melts. It includes the recording of a current response peak in current–voltage curves and the determination of the current alumina content in a melt using the obtained empirical dependence.



中文翻译:

Al 2 O 3在KF–AlF 3中的溶解

摘要

KF–AlF 3 –Al 2 O 3基熔体是用于下一代节能电池中铝电解生产的有前途的介质。这项工作使用循环伏安法分析了摩尔比[KF] / [AlF 3 ] = 1.5 mol / mol的KF–AlF 3熔体中Al 2 O 3的溶解度,并使用循环伏安法对熔体样品进行了碳热还原。 LECO分析仪。通过由碳玻璃工作电极,CO / CO 2组成的电池进行测量气体参比电极和石墨对电极。在测量期间,将伏安图上的电流响应峰记录为电位扫描速率,下一个氧化铝样品的溶解时间以及熔体中氧化铝含量的函数。电流响应峰值显示出与熔体中Al 2 O 3含量成线性关系,并且氧化物溶解速率为2.4×10 –3至5.45×10 –5 mol / s,这是熔体中氧化物含量的函数。熔化。获得的结果表明,在电解KF–AlF 3 –Al 2 O的过程中,可以对氧化铝(Al 2 O 3)含量进行无损控制。3基熔体。它包括记录电流-电压曲线中的电流响应峰值以及使用获得的经验依赖性确定熔体中的当前氧化铝含量。

更新日期:2021-03-01
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