The deep desulphurization test on low carbon steel (/%: 0. 06C. 0. 20Si

1. 20Mn

0. 020Nb

0. 015Ti) with initial (74 ~ 167) x 10

-6

[

S

]

is carried out by 20% ~40% high magnesium calcium aluminate premelted slag (/% ： 5SiO2

37CaO

42Al

2

O

3

13MgO

3FeO) combined with 60% 〜80% synthetic slag (/%: 10SiO

2

61CaO

25Al

2

O

3

4MgO) and adding 5 ~ 10 g/kg Al in a 10 kg induction furnace. Results show that during refining the sulfur content in liquid decreases to lowest value in 10 min

with gradually increasing oxygen activity in liquid and decreasing sulfi

de capacity of slag in refining process the sulfur distribution ratio between slag and liquid decreases and the phenomenon of definite resulphurization in liquid occurs ； the larger aluminum addition

lower initial sulfur content in liquid and higher sulfide capacity of slag are favorable for desulphurization reaction and to inhabit resulphurization ； the desulphurization effect of 20% high magnesium calcium aluminate +80% synthetic slag is better and with controlling refining slag ingredient (/% ) 50 ~ 60CaO

5 ~7MgO

28 ~32Al

2

O

3

~ 8SiO

2

and adding 3 g/kg Al the sulfur content in steel could decrease to 0. 001 6%.