Evolution Behavior of γ-Al_(3.5)FeSi in Mg Melt and a Separation Method of Fe from Al–Si–Fe Alloys

摘要

The recycling of high Fe-content Al–Si alloys is a green industry. Eliminating the harmful effect of Fe,achieving the separation of Al and Fe is one of the key problems. Different from traditional methods for iron removal, a novel method using magnesium melt to separate Al and Fe is proposed. By introducing Al–14 Si–5 Fe alloy into Mg melt, it was found that the γ-Al_(3.5)FeSi phase evolves to Al_3SiFe_(3.5) and Al_5Fe_2 through the melting and solidification process.Compared with the primary Al-rich γ-Al_(3.5)FeSi phase, the formation of Fe-rich Al_3Si Fe_(3.5) is quite beneficial for the separation of Al and Fe. Mg–Si–Al and Mg–Si–Fe alloys can be obtained at the top and bottom of the cooled ingot,respectively. The results in this study provide meaningful suggestions for recycling scrap Al–Si–Fe materials.