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Mise en œuvre et caractérisation d'un nouveau procédé électromagnétique destiné à favoriser les transferts de masse aux interfaces entre un métal liquide et un sel fondu

Abstract : A new electromagnetic process is set up in order to improve the mass transfers between a molten metal and a slag. The principle of the process consists to melt and stir the metal in an cold-crucible induction furnace supplied with a two-frequency alternating current. This inductive current contains a basic frequency to heat and ensure an electromagnetic stirring of the bulk metal as well as a low modulation frequency in order to destabilize the interface metal - slag. Such an inductive current is obtained by modulating the input instruction of a standard induction generator using a sinusoidal signal delivered by a function generator. A study of the hydrodynamic behaviour of the free surface of gallium in such a two-frequency induction system showed that it is possible to excite axisymetric oscillation modes when the modulation frequency of the inductive current corresponds to the eigenfrequency of the oscillation modes. The maximum amplitudes and the frequency of the deformations of the free surface were measured according to the modulation parameters imposed on the induction generator. The experimental features of the free surface oscillations agree qualitatively with those predicted by the analytical model. A system of detection of resonance, without contact with the free surface, was set up in order to detect the deformations of the free surface generated by the excitation of the oscillation modes. The aptitude of the process to improve the kinetics of transfer of zirconium from a fluorinated salt to a molten metal containing aluminium as reducing agent was studied. Experiments of transfer were carried out without and with modulation of the inductive current. They showed that, for a fixed value of the current, the transfer can be accelerated thanks to the interfacial agitation generated by the modulation of the inductive current.
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https://tel.archives-ouvertes.fr/tel-00002084
Contributor : Damien Perrier <>
Submitted on : Wednesday, December 4, 2002 - 5:26:20 PM
Last modification on : Friday, November 6, 2020 - 4:39:28 AM
Long-term archiving on: : Friday, April 2, 2010 - 8:02:44 PM

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  • HAL Id : tel-00002084, version 1

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Damien Perrier. Mise en œuvre et caractérisation d'un nouveau procédé électromagnétique destiné à favoriser les transferts de masse aux interfaces entre un métal liquide et un sel fondu. Physique [physics]. Institut National Polytechnique de Grenoble - INPG, 2002. Français. ⟨tel-00002084⟩

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