After revamping 45t AOD unit at TiSCO in 2004

due to decreasing of AOD furnace volume ratio with new furnace shell the steel spitting is serious in earlier refining period led to larger loss of metal and alloy. With the measures including in earlier decarburization period at prerequisite to insure basic basicity of slag

the amount of lime decreases from original 20% to 10% and the adding times of lime increases from original 5 times to 8 times

and in decarburization later period the nitrogen (argon) and oxygen flow rate decrease respectively from original 2040m

3

/h and 1020m

3

/h to 1800m

3

/h and 1000m

3

/h

the spitting in AOD refining process decreases obviously

the consumption of ferrosilicon decreases by 0.6 kg/t

the yield of metal increases from 96.7% to 98.4% and the refining time reduces by 3min.