Abstract: The physical properties of hot metal containing V-Ti and the choice of desulfurization process in china’s V-Ti steel making factory have been discussed in this paper. The process principle of Magnesium Lime Co-Injection desulfurization and the advantages of its application to hot metal containing V-Ti desulfurization are summarized. By comparing two process flow of extracting vanadium and desulfurization, the advantage of first extracting vanadium then desulfurization was analyzed. Through the analysis of production data in a certain steel plant, a conclusion was reached that the desulfurization agent consumption and blowing time were equivalent between semi-steel desulfurization after extracting vanadium and hot metal desulfurization by using Magnesium Lime Co-Injection method. And the consumption of magnesium powder increases as the semi-steel temperature increases. Relatively, effects of desulfurization agent injection quantity and injection time on semi-steel temperature drop are not obvious.

Key words: hot metal containing V-Ti, hot metal desulfurization, co-injection, Mg-CaO, semi-steel