Acid refining of synthesised alloys within the quaternary system Fe-Si-Ca-Al: e...

• Author(s): Queiroz, A.M. ; Margarido, F. ; Martins, J.P.
• Date: 2002
• Persistent ID: http://hdl.handle.net/10198/1498
• Origin: Biblioteca Digital do IPB
• Subject(s): Acid leaching refining; Synthesised alloys
• Document Type: Article
• Language: English

Description

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%.