铝镇静钢LF低氟精炼渣系的脱硫实验研究

Experiment Study on Desulfurization of Low-Fluoride LF Refining Slag for Aluminum Killed Steel

摘要: 本文采用CaO-Al₂O₃-SiO₂-MgO-CaF₂基础渣系，以Li₂O替代CaF₂，进行铝镇静钢LF脱硫实验。研究结果表明：渣中CaF₂经Li₂O替代后，在1500℃时，CaO (55.8%)-Al₂O₃ (20%)-SiO₂ (11.2%)-MgO (10%)-Li₂O (3%)渣的粘度低于0.3 Pa∙s，渣的流动性能良好；温度1600℃、渣金比1:10时，该渣脱硫率77.14% (脱硫之前采用铝脱氧)，钢水硫含量能降到0.008%。随着渣中Li₂O含量的增加，脱硫率升高，最高可达80%。

Abstract: Desulfurization efficiency of CaO-Al₂O₃-SiO₂-MgO-CaF₂ slag for Al-killed steel was studied with Li₂O replacing CaF₂. Experimental results show that at 1500˚C, the viscosity of CaO (55.8%)-Al₂O₃ (20%)-SiO₂ (11.2%)-MgO (10%)-Li₂O (3%) slag is lower than 0.3 Pa∙s, having good flow properties; at 1600˚C, under the condition of slag-metal ratio of 1:10, desulfurization rate of the slag can reach 77.14%, and sulfur content in steel decreases to 0.008%. Desulfurization rate can even reach to 80% with Li₂O content increasing in slag after composition optimization.