THE STRUCTURAL EFFECT ON THE KINETICS OF ACID LEACHING REFINING OF FE-SI ALLOYS

• Type: Article in International Scientific Journal
• Date: 1994

Authors

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

Journal

Title: Materials Chemistry and Physics

Vol. 38

Pages: 342-347

ISSN: 0254-0584

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 13 Citations

ISI Web of Science

Scopus - 23 Citations

Other information

Authenticus ID: P-001-JP8

DOI: 10.1016/0254-0584(94)90211-9

Abstract (EN): The kinetics of refinement of Fe-Si alloys by acid leaching is affected by their structural state. Two different phase constitutions were studied to access this effect: an industrial alloy with a low Al/Ca ratio and a laboratory-prepared alloy with a high Al content. The first contains silicon, FeSi2 (tet.), FeSi2 (orth.), beyond a quaternary phase Fe-Al-Si-Ca (Caalsifer), CaAl2Si1.5, CaSi2, Al-Fe-Si as minor phases. The precipitation of Al-Fe-Si phases is induced in the second by the high Al/Ca ratio. In a previous study, leaching experiments by a two-step procedure have shown that Ca-Al-Si, Caalsifer and Al-Fe-Si phases are more soluble. The Cracking Shrinking Model (CSM) was applied to explain the behaviour of the industrial alloy. In the present study, it is shown that the same model applies to the kinetics of dissolution of the laboratory-prepared alloy and also, that an adequate control of Fe/Al vs. Si/Ca ratios may improve the attainable refining yield.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6