Article (Scientific journals)
Direct determination of the NaF/AlF3 molar ratio by raman spectroscopy in NaF-AlF3-CaF2 melts at 1000° C
Malherbe, Cédric; Gilbert, Bernard
2013In Analytical Chemistry
Peer Reviewed verified by ORBi
 

Files


Full Text
ac401490j.pdf
Publisher postprint (1.17 MB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
Calibration curves; Chemical compositions; Direct determination; Experimental difficulties; Industrial environments; Industrial samples; Melt compositions; Metallic aluminum
Abstract :
[en] 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-Heroult 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-AlF3 molar ratio in NaF-AlF3-CaF2-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-Heroult process is finally discussed.
Disciplines :
Chemistry
Author, co-author :
Malherbe, Cédric ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique inorganique
Gilbert, Bernard ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Language :
English
Title :
Direct determination of the NaF/AlF3 molar ratio by raman spectroscopy in NaF-AlF3-CaF2 melts at 1000° C
Publication date :
2013
Journal title :
Analytical Chemistry
ISSN :
0003-2700
eISSN :
1520-6882
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 14 October 2013

Statistics


Number of views
80 (14 by ULiège)
Number of downloads
6 (6 by ULiège)

Scopus citations®
 
12
Scopus citations®
without self-citations
11
OpenCitations
 
8

Bibliography


Similar publications



Contact ORBi