铝矾土替代萤石对精炼渣脱硫去夹杂性能影响的实验研究

Study on the Effect of Desulfurization and Removing Inclusions by Making Refining Slag Using Bauxite Instead of Fluorite

本文以CaO-Al2O3-SiO2-MgO-CaF2基础精炼渣系,通过加入铝矾土等量取代CaF2,研究铝矾土替代萤石对精炼脱硫效果的影响。实验结果表明:铝矾土替代萤石造渣对钢液脱硫有良好的效果,碱度的增加和适量的铝矾土加入量,能够提高精炼渣的脱硫率,当CaO/SiO2的比值在11~12,铝矾土的含量在4%~5%时,脱硫效果最佳,可达到80%以上;实验渣对钢中夹杂物的改性和去除也有良好的效果。

In the study, the effect of bauxite instead of fluorite acting as flux in CaO-Al2O3-SiO2-MgO refining slag on desulfurization efficiency was researched. The result shows bauxite replacing fluorite im-proves desulphurization efficiency. In a certain range, the addition of bauxite can reduce the con-tent of sulfur in liquid steel. When the CaO/SiO2 ratio ranges from 11 to 12, and the content of bauxite is 4% - 5%, the desulfurization effect is best and can reach more than 80%. Besides, the slag has better property of modifying and removing inclusions.