| Abstrakt: |
The article presents the results of a study of the temperature effect on the formation of a complex alloy–mangano ferro silico chromium—from dusts formed at ferromanganese and ferrochromium production in the presence of iron shavings and high-ash coal. The study included the thermodynamic modeling of the process using the HSC-6.0 software package, based on the minimum Gibbs energy principle. In the thermodynamic modeling, the following raw materials were used: ferromanganese production dust of the following composition, %: MnO 53.3; SiO2 24.0; Fe2O3 1.5; MgO 3.50; ZnO 1.8; PbO 0.6; ferrochromium production dust of the composition, %: 3.7 Al2O3, 3.0 CaO, 25.0 Cr2O3, 8.0 FeO, 17.0 MgO, 10.0 SiO2, 4.0 C; high-ash coal containing, %: C 33.0; volatile compounds 20.0; ash 46.14 (including 23.07% of SiO2, 7.0% of Al2O3, 11.5% of Fe2O3, 2.8% of CaO, 1.8% of MgO). It was found that manganese from the dusts' mixture is completely reduced and passes into the alloy at 500 °C; chromium, regardless of the amount of coal, passes from the dust into the alloy at 1300 °C; 88.43% of silicon passes into the alloy at 1900 °C and 48% of coal. The manganese, chromium and silicon concentrations in the alloy are 19.74–27.46%, 20.45–27,20%, 8.02–26.43%, respectively. Increasing the amount of coal from 32 to 48% at a constant temperature (or increasing the temperature of a constant amount of coal) increases the silicon concentration in the alloy and reduces the chromium and manganese content. The monoalloy for producing 30HGSA steel can be obtained in the temperature range of 1793–1900 °C and coal amount of 35.5–40%; for 25HGSA steel—in the temperature interval of 1773–1900 °C and coal amount of 34.4–40%; for 35HGSA steel—in the temperature range of 1723–1850 °C and 32–40% of coal. [ABSTRACT FROM AUTHOR] |
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