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Refining of Fe-Si alloys by acid leaching

F. Margarido, J.P. Martins

1993enmetallurgyalloysleachingsilicon

Abstract

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The effect of structural composition on the purification of Fe-Si alloys by acid leaching is analyzed. Two alloys with different phase constitution were studied: industrial ferro-silicon, with a high Ca/Al ratio containing a quaternary phase Fe-Al-Si-Ca (Caalsifer) together with FeSi2 phases; and a laboratory prepared alloy in which the high Al content induces the precipitation of Al-Fe-Si phases preferably to Caalsifer, and hinders the formation of tetragonal and orthorhombic FeSi2. The leaching behaviour of the various phases, which incorporate the major impurities (Al-Fe-Si, FeSi2, Caalsifer, Ca-Si and CaAl2Si1.5) was studied using a two-step procedure: the first stage with HCl (22%, 6 h, 102°C) and the second with HCl+FeCl3·6H2O (22%+40%, 12 h, 102°C). The results show that both Caalsifer and Al-Fe-Si phases are susceptible to leaching, while tetragonal and orthorhombic FeSi2 remain as solid residues.

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@article{fa6f68ac-6b94-4a64-b975-45c208b37662,
  title={Refining of Fe-Si alloys by acid leaching},
  author={F. Margarido and J.P. Martins},
  year={1993},
  language={en}
}
TY  - JOUR
TI  - Refining of Fe-Si alloys by acid leaching
AU  - F. Margarido
AU  - J.P. Martins
PY  - 1993
LA  - en
ER  -

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