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

• Tipo: Artigo em Revista Científica Internacional
• Data: 1994

Autores

MARGARIDO, F (Autor) Outra; BASTOS, MH (Autor) Outra; FIGUEIREDO, MO (Autor) Outra; José Inácio Martins (Autor) FEUP

Revista

Título: Materials Chemistry and Physics

Vol. 38

Páginas: 342-347

ISSN: 0254-0584

Editora: Elsevier

Indexação

ISI Web of Knowledge - 13 Citações

ISI Web of Science

Scopus - 23 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6