Abstract
The effect of structural composition on the purification of FeSi 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 FeAlSiCa (Caalsifer) together with FeSi 2 phases; and a laboratory prepared alloy in which the high Al content induces the precipitation of AlFeSi phases preferably to Caalsifer, and hinders the formation of tetragonal and orthorhombic FeSi 2. The leaching behaviour of the various phases, which incorporate the major impurities (AlFeSi, FeSi 2, Caalsifer, CaSi and CaAl 2Si 1.5) was studied using a two-step procedure: the first stage with HCl (22%, 6 h, 102°C) and the second with HCl+FeCl 3·6H 2O (22%+40%, 12 h, 102°C). The results show that both Caalsifer and AlFeSi phases are susceptible to leaching, while tetragonal and orthorhombic FeSi 2 remain as solid residues.
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