I-silicon slag ingumkhiqizo ophuma ku-silicon kanye ne-ferrosilicon yensimbi yokuncibilikisa. Luhlobo lwetshe elintanta esithandweni ngesikhathi sokuncibilikisa i-silicon. Okuqukethwe kwalo kusuka ku-45% kuya ku-70%, kanti okunye kungu-C,S,P,Al,Fe,Ca. Kushibhile kakhulu kune-silicon metal emsulwa. Esikhundleni sokusebenzisa i-ferrosilicon ekwenzeni insimbi, kunganciphisa izindleko.
