With analysis on damage mechanism of lining of 100 t top and bottom combined blowing converter at Shuisteel and influence factors on slag melting performance

it is obtained that with containing per 1% V

2

O

5

content in slag the slag melting point drops by 27℃with adding per 1%TiO

2

content the hemisphere temperature of slag decreases by about 5 ℃，and as TFe content in slag is more than 20%

the range of melting temperature of slag is 1 320 ~ 1 395 ℃ . With taking the measures including hot metal fishing-slag process ； establishing converter thermal equilibrium operation mode to increase the rate of carbon-catching； using single-slag operation as Si content in hot metal is 0. 6% ~ 0. 8% and using double-slag operation as Si content in hot metal is more than 0. 8% ； establishin

g converter optimum converter lines and control measures ；optimizing molten steel temperature schedule and deoxidizing-alloying scheme to decrease the temperature of steel ； and adding appropriate amount of nut coke before reblowing rising oxygen lance to ensure lower FeO content in end slag arid improve effect of slag splashing for furnace maintenance

the consumption of refractory of converter steelmaking decreases to 8. 75 kg/1 and life of converter is up to 29 336 heats.