LF精炼渣低氟化研究进展

Research Progress on LF Refining Slag With Low-Fluorite

萤石对环境的污染日益受到重视,为了减少在精炼过程中CaF2的使用量,达到精炼渣低氟、无氟化的目的,开展了相关研究。综述了铝酸钙基精炼渣的性能以及B2O3,Li2O,BaO等替代物对精炼渣熔化温度、黏度以及脱硫能力、耐火材料侵蚀的影响。已有研究表明,使用铝酸钙基精炼渣能够有效降低CaF2的使用量,并具有良好的熔化性、发泡性以及脱硫性能;B2O3,Li2O,BaO等替代物都能够降低精炼渣的熔化温度和黏度,Li2O和BaO的加入增加了渣中O2-的活度,有利于提高精炼渣的脱硫能力。此外,精炼渣黏度的降低也促进了渣金界面反应的发生以及钢液中夹杂物的吸收。

Fluorite has a serious impact on environment.In order to reduce consumption of CaF2 in the refining process and achieve the goal of refining slag with low-fluorine or fluorine-free,related investigations were carried out in recent decades. The performance of refining slag of calcium aluminate and the influences of substitutes,such as B2 O3 ,Li2 O,BaO,on melting temperature,viscosity and desulfurization ability,corrosivity of refining slag were reviewed.The existing resear-ches show that calcium aluminate refining slag has good performances in melting,foamability and desulfurization,which leads to the reduction of consumption of CaF2 .Besides,the addition of the substitutes such as B2 O3 ,Li2 O,BaO reduces melting temperature and viscosity of refining slag.The activity of O2- increases with the amount of Li2 O and BaO in slag, which is beneficial to desulfurization efficiency of LF refining slag.In addition,low viscosity also promotes the reaction on metal-slag interface and the removal of inclusions from molten steel.