关键词: LF精炼渣, 粘度, 正交试验, 组分, 脱硫, 脱氧

Abstract: The effect of ingredient of LF refining slag (/% : 37. 5 ~54. 8CaO, 9. 8 ~ 18. 2SiO₂ , 20 ~ 30Al₂O₃,4 ~ 10MgO, 3 ~ 10CaF₂) with basicity 3 ~5 on viscosity has been tested and studied. Results show that the effect of CaF₂ and A1₂O₃ on viscosity of refining slag is great and the effect of basicity and MgO on viscosity of refining slag is rather minor. With increasing CaF₂ the viscosity of refining slag decreases first and then increases, with increasing A1₂O₃ content in slag the viscosity of slag gradually decreases ； with Al₂0₃ content in slag being 20% and CaF₂ ≥ 6% or A1₂O₃ content being 25% and CaF_{2 ≥} 3% , the viscosity value of slag at 1 500 °C is less than 0. 5 Pa • s; and it is obtained by test that better basicity R and ingredient of refining slag for viscosity is 4 ~ 5R, 25% ~30% Al₂O₃,6% 〜10% MgO, 3% 〜6% CaF₂. The results of production pilot of 100 t LF refining steel TC80 show that after refining slag optimization the sulfur content in liquid decreases to less than 0. 005% from initial 0. 020% , the desulphurization ratio increases to 84% from before optimization 72% ； and the average T [O] at end refining is 14 x 10^-6.

Key words:  , LF Refining Slag, Viscosity, Orthogonal Experiment, Ingredient, Desulfurization, Deoxidation