Evolution Behavior of γ-Al3.5FeSi in Mg Melt and a Separation Method of Fe from Al-Si-Fe Alloys

doi:10.1007/s40195-017-0627-y

Abstract

Abstract:

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-14Si-5Fe alloy into Mg melt, it was found that the γ-Al_3.5FeSi phase evolves to Al₃SiFe_3.5 and Al₅Fe₂ through the melting and solidification process. Compared with the primary Al-rich γ-Al_3.5FeSi phase, the formation of Fe-rich Al₃SiFe_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.

Key words: Al-Si-Fe, Mg melt, Fe-rich phase evolution, Separation

Tong Gao, Zeng-Qiang Li, Yao-Xian Zhang, Xiang-Fa Liu. Evolution Behavior of γ-Al_3.5FeSi in Mg Melt and a Separation Method of Fe from Al-Si-Fe Alloys[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(1): 48-54.

Figures/Tables 8

Fig. 1 a, b Microstructure and XRD of the Al-14Si-5Fe alloy; c, d 3D morphology and EDS of the γ-Al3.5FeSi particle

Fig. 2 a Size of the crucible; b, c OM and FESEM images of bottom of the cooled ingot, showing the deposition layers

Fig. 3 a Microstructure of the deposition layer; b The core-shell Fe-rich particles

Fig. 4 Scanning maps of the core-shell Fe-rich particles

Fig. 5 The core-shell Fe-rich particles a and corresponding EDS results of the shell b, core c

Fig. 6 Microstructure a and EDS b of the Fe-rich particles in the solidified ingot with an extremely low cooling rate

Fig. 7 a Microstructure of the Fe-rich particles in the intermediate evolution state; b, c 3-D morphology and EDS result of the Fe-rich particles; d Schematic diagram of the evolution of Fe-rich phase during the holding and cooling process

Table 1 Chemical composition of the alloys in the top and bottom of the solidified ingots

Sample	Average element contents
Sample	Al	Si	Fe	Mg	Impurities
B#	1.05	>1.60	5.38	91.4	Balance
T#	8.35	1.03	0.0378	90.5	Balance

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Evolution Behavior of γ-Al_3.5FeSi in Mg Melt and a Separation Method of Fe from Al-Si-Fe Alloys

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