Influence of B_2O_3 on Viscosity of High Ti-bearing Blast Furnace Slag

摘要

The influence of B_2O_3 on the viscosity of high Ti-bearing BF slag is studied under Ar atmosphere from 1 773 K (1 500℃) to about 1 593 K (1 320℃). The results show that the addition of B_2O_3 can decrease the viscosity of high Ti-bearing BF Slag containing UPC, consequently improve its fluidity. With the existence of 1.5% UPC, when the content of B_2O_3 increased from 0 to 4.1%, the volume fraction of perovskite decreased from 7.7% to 1.6% at 1 610 K. Meanwhile, the liquidus temperatures decreased from 1 619 K to 1 613 K. At a lower temperature, B_2O_3 was easy to form a eutectic and decreased the viscosity of mol ten slag. At a higher temperature, some tetrahedron [BO_4]~(5-) changed into triangle [BO_3]~(3-) which would dis integrate the chains/molecules of molten matrix and decreased its viscosity.