Study on phase separation of suanite from boronrich blast furnace slag
1.School of Materials and Metallurgy, Northeastern University, Shenyang, Liaoning 110004,China; 2.School of Mechanical Engineering, Shenyang Institute of Chemical Technology, Shenyang, Liaoning 110142, China)
Abstract：The phase separation of suanite of MgO-B2O3-SiO2-Al2O-CaO system slag at different cooling rate is studied under the condition of continuous cooling and stepped cooling respectively by using scanning electron microscopies and X-ray diffraction. The experiment results indicate that the high melting point forsterite is separated out earlier than the suanite, which prevents the nucleation and coarsening of suanite when the temperature of the slag decreases from 1 500 ℃ to 800 ℃ at different cooling rate. The stepped cooling method, with rapid cooling of 1 500~1 200 ℃,can prevent the separation of forsterite phase and reduces the inhibition effect of forsterite on the nucleation and growth of suanite.Heat is preserved at 1 200 ℃ to ensure the sufficient interaction time among the particles, which is favorable toward the nucleation and growth of suanite. So the separation and growth of suanite phase are affected not only by undercooling and viscosity but also by the crystallization of forsterite.
2011, Vol. 32 
