OBTAINING A SILICON ALLOY FROM A SEDIMENTARY ROCK - TRIPOLI

Shevko V. Mirkayev N. Lavrov B. Badikova A.
2023 University of Chemical Technology and Metallurgy

Journal of Chemical Technology and Metallurgy
2023 #58 Issue 2 367 - 375 pp.

The article examines the results of studies on the production of ferrosilicon from tripoli - a sedimentary rock consisting of opal-like silica. The main part of tripoli is amorphous silica. The studies included the thermodynamic modeling using the HSC-6.0 software package, based on the minimum Gibbs energy principle, combined with the second-order rotatable designs and electric melting of tripoli in an arc furnace. It was found that the interaction products in a tripoli-carbon-iron system under equilibrium conditions are FeSi₂, Fe₃Si, FeSi, Fe₅Si₃, SiC, SiO_(g), Al, Si. Formation of FeSi and Fe₃Si occurs at 1200°С; of Fe₅Si₃ and Si - at 1400°С; of FeSi2 and SiC - at 1500°С; of aluminum - at 1700°С. An increase in the amount of iron from 25 % to 50 % by weight of tripoli allows to increase the extraction degree of silicon into the alloy at 1900°С to 82.5 %. To obtain FS45 grade ferrosilicon from tripoli, the following conditions are necessary: temperature of 1750 - 1900°С, the presence of 37.8 - 51 % of iron and 37 % of carbon. The electric smelting in an arc furnace allows producing FS50 grade ferrosilicon containing 51.1 % of silicon.

electric melting , ferrosilicon , silicon alloy , thermodynamic modeling , tripoli

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M. Auezov South Kazakhstan University Department of Metallurgy, 5 Tauke Khan ave., Shymkent, 160012, Kazakhstan
Saint-Petersburg State Institute of Technology Department of General Chemical Technology and Catalysis, 26 Moskovsky prospect, Saint-Petersburg, 190013, Russian Federation

M. Auezov South Kazakhstan University Department of Metallurgy
Saint-Petersburg State Institute of Technology Department of General Chemical Technology and Catalysis

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