Production of ferroalloys from carbonaceous rock with replacement of steel chips with magnetite

Abstract

The article presents the results of studies on the production of ferrosilicon, ferrosilicoaluminium and Fe-Si-Al ligatures when replacing steel chips with magnetite. The object of research was the carbonaceous rock of the Borly deposit. Thermodynamic modeling was carried out using the HSC-5.1, Chemistry software package of the Finnish metallurgical company Outokumpu, based on the principle of minimizing Gibbs energy, and experimental studies-electric melting in an arc furnace at 1000-1400°C begin to form. It was found that under equilibrium conditions, the interaction of Borly ash components with magnetite and carbon in the presence of silicon oxide with silicon-containing reduction products - Si, SiO, FeSi₂, Fe₃Si, FeSi, SiC; with an increase in the amount of carbon, the degree of silicon extraction in SiC increases. in the elemental state and decreases- in Fe₃Si, FeSi; the degree of silicon extraction into the alloy increases, amounting to at 2000°C and 51% carbon, and the degree of silicon transition into the alloy also increases, amounting to 76.4% at 2100°C and 51% carbon. It is determined that, from Borly ash under equilibrium conditions, it is possible to obtain ferrosilicon grades FeSi15, FeSi25, FeSi45 and FeSi50 in the temperature range 1260-1860°C and ferrosilicoaluminium grades FS45A10 and FS45A15 in the temperature range 1930-2100°C. It has been experimentally established that ferrosilicon of the FeSi60 brand (68.7% Si, 1.3% Al) is formed from the conclusions of the electric melting of coal waste together with magnetite concentrate, quartzite and coke.