Reference : Determination of the composition of cryolitic melts involved in the Hall-Heroult proc...
Scientific congresses and symposiums : Unpublished conference
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/132760
Determination of the composition of cryolitic melts involved in the Hall-Heroult process by Raman spectroscopy
English
Malherbe, Cédric mailto [Université de Liège - ULg > Département de chimie (sciences) > Chimie analytique et électrochimie >]
Gilbert, Bernard mailto [Université de Liège - ULg > Département de chimie (sciences) > Département de chimie (sciences) >]
Aug-2012
No
Euchem 2012: Conference on Molten Salts and Ionic Liquids
from 5-8-2012 to 10-8-2012
[en] Raman ; alumina ; cryolithe ; quantitative
[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.
http://hdl.handle.net/2268/132760

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