Direct Determination of the NaF/AlF3 Molar Ratio by Raman Spectroscopy in NaF鈥揂lF3鈥揅aF2 Melts at 1000 掳C

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• 作者：Cedric Malherbe ; Bernard Gilbert
• 刊名：Analytical Chemistry
• 出版年：2013
• 出版时间：September 17, 2013
• 年：2013
• 卷：85
• 期：18
• 页码：8669-8675
• 全文大小：302K
• 年卷期：v.85,no.18(September 17, 2013)
• ISSN：1520-6882

文摘

For the last 40 years, Raman spectroscopy has been very useful in investigating the structure of corrosive molten salts, such as the cryolite-based melts widely used as electrolyte in the Hall鈥揌eroult process. Even if this process remains the most economically efficient for metallic aluminum electro-production, it suffers from a high energy loss, which is dependent on the melt composition. Therefore, controlling the chemical composition of the electrolyte is essential. The present paper proposes to apply Raman spectroscopy for the direct determination of the NaF鈥揂lF₃ molar ratio in NaF鈥揂lF₃鈥揅aF₂-based melts. Despite the experimental difficulties, a calibration curve based on equilibria taking place in the melt has been developed and the procedure has been successfully compared to industrial samples of known compositions. The possible exportation of the laboratory scale procedure to an industrial environment application for the control of the Hall鈥揌eroult process is finally discussed.