I-silicon slag yimveliso evela kwi-silicon yesinyithi enyibilikisayo kunye ne-ferrosilicon.Luhlobo lwe-scum edada kwiziko kwinkqubo yokunyibilikisa i-silicon.Umxholo usuka kwi-45% ukuya kwi-70%, kwaye ezinye ziyi-C,S,P,Al,Fe,Ca. Ixabiso eliphantsi kakhulu kunentsimbi ye-silicon ecocekileyo. Esikhundleni sokusebenzisa i-ferrosilicon ekwenzeni i-steelmaking, inokunciphisa iindleko.