Obtaining of ferrosilicon from technogenic magnetite concentrate
DOI:
https://doi.org/10.31643/2020/6445.20Keywords:
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), Zng (> 800 0C) Pbg (> 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.
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