REFINING OF FE-SI ALLOYS BY ACID LEACHING

• Type: Article in International Scientific Journal
• Date: 1993

Authors

MARGARIDO, F (Author) Other; José Inácio Martins (Author) FEUP; FIGUEIREDO, MO (Author) Other; BASTOS, MH (Author) Other

Journal

Title: Hydrometallurgy

Vol. 32

Pages: 1-8

ISSN: 0304-386X

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 9 Citations

ISI Web of Science

Scopus - 12 Citations

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

Other information

Authenticus ID: P-001-NKY

DOI: 10.1016/0304-386x(93)90052-f

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8