Acid Refining of Synthesised Alloys Within the Quaternary System Fe-Si-Ca-Al: effect of ferric ions

• Type: Article in International Scientific Journal
• Date: 2000

Authors

A. M. Queiróz (Author) Other; F. Margarido (Author) Other; José Inácio Martins (Author) FEUP

Journal

Title: Minerals Engineering

Vol. 22 No. 4

Pages: 303-322

ISSN: 0892-6875

Publisher: Elsevier

Indexing

Scopus

COMPENDEX

Other information

DOI: 10.1080/08827509808962504

Abstract (EN): A systematic study of synthesis of different chemical composition of alloys within the quaternary Fe-Si-Ca-Al system, versus acid leaching refining using HCl with or without FeCl3 has been undertaken. Such study has the aim of achieving an adequate structural composition of Fe-Si alloys, in order to obtain high purity and fine particle size silicon by acid leaching, at more reduced costs. The experimental results show that an adequate control of Fe/Al and Si/Ca concentration ratios can hinder the formation of tetragonal and orthorhombic FeSi2 phases, and consequently promotes a successful refining of ferro-silicon alloys. The presence of ferric ion influences on a distinct way the rate of removal of Al-Fe-Si and Fe-Al-Si-Ca phases, increasing the first and decreasing the second one. The suitable starting composition which could give the expected results must be the following: 92-94% Si; 3-3.5% Fe; 3.5-4% Al and Ca ≤ 0.5%.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 20