1 Research and Design Institute of Metallurgical, BGRIMM Technology Group, Beijing 100160, China 2 College of Engineering, Peking University, Beijing 100871, China
Influence of desulfurization slag containing oxides of vanadium and titanium on semi-steel pre-desulfurization
1 Research and Design Institute of Metallurgical, BGRIMM Technology Group, Beijing 100160, China 2 College of Engineering, Peking University, Beijing 100871, China
摘要 The desulfurization and resulfurization of slag containing oxides of vanadium and titanium (CaO–SiO2–MgO–Al2O3–V2O3–TiO2–FeO) in the pretreatment of semi-steel desulfurization at 1623 K were investigated. Based on the ionic structure theory of slag, it could be concluded that V2O3 and TiO2 combined with (O2–) to form complex anions including VO33–, TiO44–, etc., which reduced the activity of (O2–) and decreased the sulfur partition ratio (LS). And FeO enhanced the activity of [O] at the slag–metal interface, which decreased the desulfurization capacity of the slag. Compared to the binary basicity, the presented basicity expression containing V2O3 and TiO2 described the relationship between LS and basicity more accurately. Considering the problems of dilute slag, a large amount of residual slag and much resulfurization in the slagging-off process after pretreatment, the effect of CaO + C-based slag modifier on the resulfurization, melting point and viscosity of the desulfurization slag was investigated. It was proposed that adding 5%–10% of the slag modifier to the desulfurization slag after desulfurization decreased the resulfurization effectively. And the added modifier adjusted the slag viscosity well, which helped to reduce iron loss and residual slag.
Abstract：The desulfurization and resulfurization of slag containing oxides of vanadium and titanium (CaO–SiO2–MgO–Al2O3–V2O3–TiO2–FeO) in the pretreatment of semi-steel desulfurization at 1623 K were investigated. Based on the ionic structure theory of slag, it could be concluded that V2O3 and TiO2 combined with (O2–) to form complex anions including VO33–, TiO44–, etc., which reduced the activity of (O2–) and decreased the sulfur partition ratio (LS). And FeO enhanced the activity of [O] at the slag–metal interface, which decreased the desulfurization capacity of the slag. Compared to the binary basicity, the presented basicity expression containing V2O3 and TiO2 described the relationship between LS and basicity more accurately. Considering the problems of dilute slag, a large amount of residual slag and much resulfurization in the slagging-off process after pretreatment, the effect of CaO + C-based slag modifier on the resulfurization, melting point and viscosity of the desulfurization slag was investigated. It was proposed that adding 5%–10% of the slag modifier to the desulfurization slag after desulfurization decreased the resulfurization effectively. And the added modifier adjusted the slag viscosity well, which helped to reduce iron loss and residual slag.
Bi-wen Yang,Yi-hang Hu,San-ping Liu, et al. Influence of desulfurization slag containing oxides of vanadium and titanium on semi-steel pre-desulfurization[J]. Journal of Iron and Steel Research International, 2022, 29(6): 939-950.
2022, Vol. 29 
