THEORY AND TECHNOLOGY OF MANUFACTURING A FERROALLOY FROM CARBON FERROCHROME DUSTS

The article contains the research results of obtaining a ferroalloy from carbon ferrochrome dust containing 30,2% Сr2O3, 23.4% SiO2, 32.7% MgO, 5.0% FeO, 1.6% CaO, 4.5%of Al2O3, 2.3%of C, and 0.3 %-others. studies were carried out by thermodynamic modeling method using HSC-5.1 software package (Outokumpy) based on principle Gibbs energy minimum, Box-Hunter rototable planning technique electric melting in an arc furnace. It was found that interaction with under equilibrium conditions presence iron leads to formation Cr4C(T>10000C),Cr3C2, Cr7C3,Cr (T>11000C), FeSi (T>13000C), SiC (T>14000C), SiOg Si(T>15000C). In temperature range 1745-19000C 18-34% 8% mass, resulting contained 18.5-25.2% Si 46.8-49.4% Cr (in this case silicon extraction degree into alloy 60.0-64.4%, chromium one–99.8%). When electrosmelting granulated together coke steel shavings, 98-99%, one–53-57%; obtained ferroalloys 18.3-21.9% 45.6-53.6%of meet requirements FeCrSi23-grade ferrosilicochromium.