|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|Scientific congresses and symposiums : Unpublished conference|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|
|Determination of the composition of cryolitic melts involved in the Hall-Heroult process by Raman spectroscopy|
|Malherbe, Cédric [Université de Liège - ULg > Département de chimie (sciences) > Chimie analytique et électrochimie >]|
|Gilbert, Bernard [Université de Liège - ULg > Département de chimie (sciences) > Département de chimie (sciences) >]|
|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.
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