The effect of basicity

BaO(6%-14% )

CaF

2

(0-10% ) and A1

2

O

3

(18%-28% ) on semispherical melting-point and melting rate of basic refining slag series CaO-SiO

2

-

A1

2

O

3

-MgO-CaF2 has been studied with CQKJ-III mineral slag melting temperature measure device and MTLQ-RD-1300 semispherical melting point (melting temperature) and melting rate comprehensive measuring system and by orthogonal examination. Results show that the influence factors on melting poin

t of high basicity refining slag are CaF

2

BaO

A1

2

O

3

and basicity R and weaken sequentially

and the sequence of influence factors on melting rate are basicity R

A1

2

O

3

CaF

2

and BaO； it is available by increasing refining slag basicity and adding suitable

A1

2

O

3

to decrease melting point of refining slag and increase melting rate

while the refining slag melting point decreases and its melting rate increases in varying degree by adding BaO and CaF

2

with basicity 4-5

10%-14% BaO

23%-28%

A1

2

O

3

and 5%-10% CaF

2

the refining slag has lower melting point ( about 1340 ℃ ) and larger melting rate (melting time ＜50 s); with reducing the size of high basicity refining slag particles the melting point of slag decreases and the melting rate increases.