Modélisation de la purification de l'aluminium liquide par procédé de flottation en cuve agitée

Abstract : Inclusions removal by flotation in mechanically agitated vessels is widely used in liquid aluminium treatments. This process consists of gas injection in a molten aluminium reactor using an impeller. Inclusions are attached to the bubbles while rising into the liquid bulk and released in the froth at the vessel surface.With the aim of both a better understanding of the physical processes acting during flotation and the optimization of the refining process, a 2D mathematical modelling of the flotation tank was set up. Transport phenomena, sedimentation, agglomeration and flotation of inclusions were considered here. The model couples Population Balance with convective transport of the inclusions, in the multiphase flow field. Simulations showed that a good dispersion of the bubbles into the tank, especially in the high turbulence zones, is essential for an efficient process. This situation was achieved with a strong agitation. Gas flow affected the process efficiency weakly.Theoretical and experimental studies on chlorine effects were done. It was noticed that a critical amount of chlorine into the melt is required for the flotation to be efficient. Complete understanding of chlorine role is not achieved yet, but promising ideas for future research have been exhibited
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Olivier Mirgaux. Modélisation de la purification de l'aluminium liquide par procédé de flottation en cuve agitée. Autre. Institut National Polytechnique de Lorraine, 2007. Français. ⟨NNT : 2007INPL105N⟩. ⟨tel-01748932⟩

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