Experimental study on stabilizing free lime in molten BOF slag by using BF slag

In this work,basic oxygen furnace(BOF)slag was modified at high temperature with blast furnace(BF)slag by changing R(R=w(CaO)/w(SiO2)). The results showed that BF slag can effectively stabilize fCaO in BOF slag. When R is 1.5 and duration time at 1 500 ℃ is 30 min,the f-CaO elimination rate reached80.22%. Through X-ray diffraction and FESEM analysis,there were gehlenite,akermanite and pleonaste phases presented in the reconstructed slag. A positive correlation was established between the reduction in f-CaO content and the increase in gehlenite and akermanite contents.