关键词: 高钛铁水, 转炉, 少渣, 固钛, 实践

Abstract: The consumption quantity of slagging materials is one of key economic and technical indicators of BOF steelmaking and represents the technical level of steelmaking, but it is inconsistent with the requirements of dephosphorization and furnace-lining protection. In an iron and steel enterprise, the contents of titanium and phosphorus in hot metal are high due to titanium-bearing iron ore used for ironmaking in blast furnace, so the consumption quantity of slagging materials is high in order to meet requirements of dephosphorization and furnace-lining protection. Therefore, based on the characters of high-titanium hot metal and the characteristics of slagging in BOF, the rules about oxygen supply and slagging were improved, a method called as “magnesium fixing titanium” (TiO₂ becomes inactive due to its combining with MgO) was taken as a technique to suppress the disadvantage influence of high TiO₂ slag on dephosphorization and furnace-lining protection to enhance the advantage efficiency of slag. By the continuous improvement of the above processes, a BOF less-slag steelmaking technology with high-titanium hot metal was developed. The consumption quantity of slagging materials was reduced from 55.67 kg/t to 47.86 kg/t. Good economic benefit was achieved, and a foundation for the development of high efficient steelmaking technology was laid.

Key words: high-titanium hot metal, BOF, less slag, fixing titanium, practice