It is basic condition for production of cleanliness to control Are furnace[P][S]

total amount of [Pb] and [Zn].To prevent rephosphorization and slag free tapping are key operations to get low [P][S] molten steel of arc furnace. AS melting down the [Pb] exceeds standard limit

first stop carbon injection operation and increase blown oxygen amount and angle to decrease [C] less than 0. 10%

with molten steel stirring and heating for 2~6 min to promote [Pb] which deposits at bottom

solubilized in steel

oxidized and trapped by slag

then inject foaming agent carbon powder to reduce Pb oxide to Pb which evaporates and exhausts. The de-[Pb] ratio was 19.0%～46.4%.T he de-[Zn] operation is similar to that of de-[Pb].