One effective method of reducing the cost of making refined grades of ferrochromium is the use of inexpensive silicon-aluminum reducing agents obtained from wastes formed in the coal-mining industry. A silicon-aluminum alloy is used to reduce chromium ore. In the course of smelting with the complex silicon-aluminum alloy, melting of the charge materials is accompanied by the reaction of magnesia-bearing chromium spinel with the aluminum of the reducing agent. The chromium-magnesia spinel subsequently decomposes. The reaction increases the speed and completeness of the reduction of chromium from the spinel thanks to the presence of silicon in the ferrosilicon-aluminum that is used in the process.
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Translated from Metallurg, No. 8, pp. 35–41, August, 2013.
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Isin, D.K., Baisanov, S.O., Tolymbekov, M.Z. et al. Ferrochromium Smelting Technology. Metallurgist 57, 682–689 (2013). https://doi.org/10.1007/s11015-013-9787-9
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DOI: https://doi.org/10.1007/s11015-013-9787-9