Изучение силикотермического процесса восстановления никеля и железа методом термодинамического моделирования

Abstract

The results of studying the effect of silicon concentration of ferrosilicon: FeSi5 (5% Si), FeSi20 (20% Si), FeSi35 (35% Si), FeSi50 (50% Si), FeSi65 (65% Si) on the degree of nickel (? Ni ) and iron (? Fe ) reduction of the CaO-SiO 2 -MgO-Al 2 O 3 -FeO-NiO-P 2 O 5 multicomponent oxide system at a temperature of 1500 0 C by thermodynamic simulation are given 2 . The HSC Chemistry 6.12 software package developed by Outokumpu (Finland) was used for the simulation. The chemical compounds Ni 3 Si and Ni 5 Si 2 with the corresponding thermodynamic characteristics are entered into the database. The calculations were performed by the “Equilibrium Compositions” subroutine at a gas pressure of 1 atm, containing 2.24 m 3 N 2 as a neutral additive. The obtained modeling results indicate the thermodynamic possibility of nickel and iron reduction from the CaO-SiO 2 -MgO-Al 2 O 3 -FeO-NiO-P 2 O 5 oxide system by silicon of ferrosilicon. The degree of iron reduction increases from 88.8 to 91.4% with an increase in the silicon concentration of ferrosilicon [Si] FeSi from 5 to 65%. The degree of nickel reduction with an increase in the silicon concentration of ferrosilicon remains almost unchanged and amounts to 99.8-99.7%. The degree of use of silicon is 92.1–94.5%. The chemical composition of the complex alloy – ferrosiliconickel is determined. The obtained simulation results can be used to develop the technology for producing ferrosiliconickel from nickel ore by silicothermic method