The lime with 260

401

397 and 383 mL four kinds of activity is manufactured by calcined limestone. The ingredient of tested slag for desulphurization of hot metal is (/% :) 35.18〜44.84CaO

13.80〜23.46SiO

2

18.98Al

2

O

3

9. 49MgO

1.89Fe

2

O

3

11.00CaF

2

with basicity 1.5~3.25

and the chemical composition of hot metal is (/% :) 4.53C

0.16Si

0.107S

0.099P. The tested slag-metal ratio is 7：100 to 15：100 and the desulphurization test is in an induction furnace at 1330〜1390 °C. The sulphur content in metal in crucible is analyzed by a fluorescence analyzer

and the distribution of specific surface area and size of pore of lime are measured by an automate pressure mercury analyzer. The

experiment is carried out by a single variable method to study the effect of slag basicity

melting temperature

slag-metal ratio and activity of lime on desulphurization of hot metal. The test results show that the lime with activity 397 mL is larger specific surface area and more uniform pore distribution

it has best desulphurization effect. With slag basicity 2.25

slagmetal ratio 15：100 and at 1390℃

by using lime with activity 397 mL the desulphurization ratio of metal is up to 97.2%.