Effect and mechanism of B₂O₃ on apparent viscosity of slag during smelting of vanadium-titanium magnetite in the Blast Furnace

Institute of Resources and Environment Science, Pangang Group Research Institute Co. Ltd, Panzhihua 617000, Sichuan, P.R. China
e-mail: linyh@pzhsteel.com.cn

Received: 1 March 2016
Accepted: 23 June 2016

Abstract

Considering the low fluidity and the difficulties in separating high Ti-bearing blast furnace slag from hot metal, the effect of B₂O₃ on apparent viscosity under argon atmosphere was studied from 1340 °C to 1475 °C using Brookfield Rotational Viscometer, Metallographic Microscope, et al. The results showed that the addition of B₂O₃ could decrease melting temperature of high Ti-bearing blast furnace slag and increased its fluidity. With increasing the amount of B₂O₃ from 0 to 3%, mass fraction of perovskite in high Ti-bearing blast furnace slag gradually decreased, but four times the mass fraction of anosovite. The Ti(C,N) appeared enrichment in the high Ti-bearing blast furnace slag, and the enrichment changed with the addition of B₂O₃ increasing.