Investigation results for segregation in terms of chemical compositions of various ordinary and refined ultra-low carbon FeSi75 ferrosilicon fractions have been presented. The subject of investigations was ferrosilicon obtained under industrial conditions after mechanical shredding and separation on 10-60 mm, 3-10 mm and 0-3 mm sieves. In addition, specimens of the individual ferrosilicon fractions were sieved on sets of laboratory sieves and fractions with limited granulometric compositions were separated. The investigations have confirmed a high level of elemental segregation in individual fractions, which is related to ingot solidification, a high-temperature range between liquidus and solidus of silicon-based alloys, movement of the solidification front towards zones with decreasing melting points and self-decomposition of silicon-based alloys. The most distinctive differences in chemical compositions between ordinary and refined ferrosilicons refer to light elements with a high affinity for oxygen: Al, Ca, which is associated with their oxidation during ferrosilicon transfer from the tapping ladle into the refining ladle. It has been confirmed that the mechanism of carbon removal during ferrosilicon refining occurs through floatation of SiC carbide inclusions in liquid metal bath mediated by CaO, Al2O3 oxides.Keywords: Ferrosilicon, submerged arc furnace, refining, chemical composition
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