In order to decrease the CaF2 content in dephosphorization slag (40CaO

52Fe

2

O

3

6 - 8CaF

2

) for hot metal pretreatment

the CaF

2

in pretreatment dephosphorization slag was replaced respectively by 2% 〜8% Al

2

O

3

B

2

O

3

Li

2

O and dolomite to study dephosphorization effect after replace. Test results at 1 450 °C showed that Al

2

O

3

B

2

O

3

Li

2

O and dolomite might be used instead of CaF

2

to form low fluoride or free fluoride slag for hot metal pretreatment. With replacing CaF

2

by Al

2

O

3

or Li

2

O

the dephosphorization effect of pretreatment of slag improved and with replacing CaF

2

by B

2

O

3

or dolomite the dephosphorization effect of slag was about equal to that of fluoride slag.