With analysis on the mechanism of early stages slag making by limestone and calculation of heat balance in converter

it is obtained that as controlling limestone consumption 6.0 t/heat

the hot metal consumption must increase by 2.1 t/heat and the scrap consumption shall decrease by 2.5 t/heat

it may insure that the end temperature by limestone steelmaking process is the same by lime steelmaking process. Pilot production results show that with limestone slag making technology the converter steelmaking end basicity (3.3)

end temperature (1662 °C )

end [C] (0.081%)

end [P] (0.016% ) and end percentage of hits (90% ) showing no difference from that with conventional lime slag making technology. But with limestone slag making technology the cost of converter stock decreases by 10. 4 yuan /t steel to get better economic and social benefit.