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| Reference : Determination of the composition of cryolitic melts involved in the Hall-Heroult process... |
| Scientific congresses and symposiums : Unpublished conference | |||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  [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) >] | |
| Aug-2012 | |
| 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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