REFINING OF FE-SI ALLOYS BY ACID LEACHING

被引：11

作者：

MARGARIDO, F

MARTINS, JP

FIGUEIREDO, MO

BASTOS, MH

机构：

[1] FEUP, DEPT ENGN QUIM, P-4000 OPORTO, PORTUGAL

[2] IICT, CTR CRISTALOG, P-1000 LISBON, PORTUGAL

来源：

HYDROMETALLURGY | 1993年 / 32卷 / 01期

关键词：

D O I：

10.1016/0304-386X(93)90052-F

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

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-degrees-C) and the second with HCl+FeCl3.6H2O (22%+40%, 12 h, 102-degrees-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.

引用

页码：1 / 8

页数：8

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