Acid Leaching of Alloys within the Quaternary System Fe−Si−Ca−Al

Silicon with high purity and fine particle size can be produced by acid leaching of Fe−Si industrial alloys under the condition that they have adequate chemical composition and structural constitution. Such alloys contain phases that fall within the system Fe−Si−Ca−Al, where a quaternary phase Caals...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 1997-12, Vol.36 (12), p.5291-5295
Main Authors: Margarido, F, Figueiredo, M. O, Queiróz, A. M, Martins, J. P
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Hydrometallurgy
Metals. Metallurgy
Production of metals
Production of non ferrous metals. Process materials
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Summary:Silicon with high purity and fine particle size can be produced by acid leaching of Fe−Si industrial alloys under the condition that they have adequate chemical composition and structural constitution. Such alloys contain phases that fall within the system Fe−Si−Ca−Al, where a quaternary phase Caalsifer, with approximate formula (Fe0.8Al0.1□0.1) (Si0.8Ca0.2)2, is found along with several binary and ternary phases (Fe−Si, Ca−Si, Al−Fe−Si, Ca−Al−Si). With the purpose of optimizing the phase, constitution alloys were synthesized within the system Fe−Si−Ca−Al. The results of leaching experiments performed using HCl (150 and 220 g/L) at constant temperature (T = 102 ± 1 °C) and ordinary atmosphere indicate that the Caalsifer plus Al−Fe−Si phases should be maximized whereas the FeSi2 phases should be minimized, by controlling Al/Ca and Fe/Si concentration ratios in the synthesis process.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie970295y