The effect of initial silicon content (0. 01% ~0. 61% Si) in metal ( % : 3. 34 ~ 3. 90C

0. 01 ~0. 15Mn

0. 014 ~0. 082P

0. 019 ~0. 051S) on simultaneous removal of silicon

manganese

phosphorus and sulphur during metal pretreatment process has been studied by using a 90 t ladle furnace. Results show that with higher initial silicon content the critical temperature of oxidation of carbon and silicon is higher

led to decrease of the oxidation of carbon even increase of the carbon content in metal; and with lower initial silicon content the critical temperature of oxidation of carbon and silicon is lower

and the [Si] and [C] are oxidized simultaneously； and with higher initial silicon content the amount of removal of silicon and manganese increases

but dephosphorization and desulphurization are suppressed led to resulphurization.