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Determination of the composition of cryolitic melts involved in the Hall-Heroult process by Raman spectroscopy
Malherbe, Cédric; Gilbert, Bernard
2012Euchem 2012: Conference on Molten Salts and Ionic Liquids
 

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Keywords :
Raman; alumina; cryolithe; quantitative
Abstract :
[en] Considering our experience in the study of such highly corrosive media by Raman spectroscopy and since the bath spectrum is function of the molar NaF/AlF3 ratio and the Al2O3 content, we have proposed in the past to apply that technique to the direct determination of the melt composition . Recent instrumental developments on CCD based spectrometers have made the proposed method more feasible. This presentation will first demonstrate that, employing an updated instrument provided with new optical filters and a more sensitive CCD detector, better quality spectra are obtained. Afterward, new results relevant to the development of our analytical method for the direct determination of the molar NaF/AlF3 ratio and the Al2O3 content in cryolitic melt will be discuss. Different aspects of the calculation procedure will be illustrated:  Estimation and subtraction method of the Rayleigh decay from melt spectra;  Development of an internal normalisation procedure based on equilibria in the melt and assisted by home-made software;  Establishment of calibration curves for the determination of the molar ratio NaF/AlF3 in the melt;  Establishment of calibration curves for the determination of oxide content in the melt;  Overall procedure for the composition determination.
Disciplines :
Chemistry
Author, co-author :
Malherbe, Cédric ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique et électrochimie
Gilbert, Bernard ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Language :
English
Title :
Determination of the composition of cryolitic melts involved in the Hall-Heroult process by Raman spectroscopy
Publication date :
August 2012
Event name :
Euchem 2012: Conference on Molten Salts and Ionic Liquids
Event date :
from 5-8-2012 to 10-8-2012
Available on ORBi :
since 23 October 2012

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