Preliminary research on the behavior of limestone charged into converter in the process of making slag

The behavior of limestone which is utilized for slagging instead of lime during converter steelmaking process was discussed with the data collected from laboratorial and industrial experiments.The result can be concluded that: limestone which is directly charged into converter as slag-forming material during early period of steelmaking process can be quickly decomposed and involved in making slag and in addition it has more advantages over lime in several respects;the anticipant result can be achieved using limestone to make slag,and limestone is completely decomposed during 5～6 minutes in converter steelmaking process;high temperature is propitious to calcium carbonate decomposing,just as the result of laboratorial experiments shows that the decomposition rate of CaCO3 at 1 400 ℃ is 3～4 times greater than that at 1 100 ℃ in spite of only 300 ℃ difference,therefore,the early period temperature has a great effect on the decomposition and slagging processes.