Obtaining of ferrosilicon from technogenic magnetite concentrate

V.M. Shevko; P.V. Kaskin; A.D. Badikova; D.D. Amanov

doi:10.31643/2020/6445.20

Authors

V.M. Shevko M. Auezov South Kazakhstan State University
P.V. Kaskin Iron Concentrate Company LLP
A.D. Badikova M. Auezov South Kazakhstan State University
D.D. Amanov M. Auezov South Kazakhstan State University

DOI:

https://doi.org/10.31643/2020/6445.20

Keywords:

magnetite concentrate, quartzite, coke, thermodynamic modeling, electric melting, ferrosilicon.

Abstract

The article presents the results of studies on the production of ferrosilicon from iron ore (magnetite) concentrate and quartzite. The studies were carried out by thermodynamic simulation using the HSC-5.1 software package, based on the principle of Gibbs minimum energy and electric smelting of the concentrate together with coke and quartzite in a single-electrode arc furnace. Based on the studies, it was found that, under equilibrium conditions, the interaction of magnetite concentrate with silicon oxide (IV) and carbon is accompanied by the formation of FeSi (> 1200 ⁰C), Fe₃Si (> 1100 ⁰C), FeSi₂ (> 500 ⁰C), Zn_g (> 800 ⁰C) Pb_g (> 1200 ⁰C); the degree of silicon extraction into the ferroalloy depends on the ratio in the SiO₂ / Fe₃O₄ mixture, decreasing from 85.6 to 66.1 (for example, at 1700⁰С) with an increase in the SiO₂ / Fe₃O₄ ratio from 0.42 to 1.25. When melting a mixture containing 70% concentrate, 11% quartzite, 19% coke, a ferroalloy containing 15-18% Si. The resulting ferroalloys are graded from FeSi15 to FeSi45.