Modelling of hydrogen removal in gas fluxing of molten aluminium

Mortensen, D. , Hua, J. , Håkonsen, A. , Haugen, T. , Fagerlie, J.O.
In: Light Metals 2017 / Editors: Ratvik, Arne P. - Publ by TMS (The Minerals, Metals & Materials Society), Springer, 2017. ISBN 978-3-319-51541-0, p. 1445-1450
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Rotary degassing is one of the most commonly used methods for removing dissolved hydrogen and solid particles from molten aluminium . In order to improve the removal efficiency of both hydrogen and inclusions removal, together with possibly lower investment and operating cost for the degassing equipment, modelling can be used to study the process in detail. The removal efficiency depends on bubble size distribution, level of turbulence, residence time of bubbles in the melt etc. A modelling approach is presented including multiphase flow and mass transfer of impurities between the phases dependent on the solubility of the impurities in the different phases. A finite element model is used to solve the conservation equations and the impurity transport. A detailed 3D model for the in-line Hycast I-60 SIR melt refiner unit is used and the model is compared with experimental results.
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