BaO 和 Li2O 对 CaO 基脱硫精炼渣熔点和粘度的影响

以CaO(bal)-SiO₂(22.4%)-Al₂O₂(11.6%)-CaF₂(10%)精炼渣作为基础渣系,用BaO、Li₂O替代其中等量的CaO含量,固定(CaO+RxO)/SiO₂=2.5(RxO代表BaO或者Li₂O),对该脱硫精炼渣系的熔点和粘度进行了研究。结果显示在传统的CaO基熔渣中加入BaO、Li₂O可以降低渣系的熔点和粘度,有效地改善了渣钢反应的动力学条件。当(BaO,Li₂O)=15%时,熔渣的熔点分别为1267℃和1185℃,远低于不加添加剂时的熔点1326℃,当温度为1475℃时,熔渣粘度分别为0.98Pa·s和0.51Pa·s,远小于不加添加剂时的粘度1.79Pa·s,使渣系具有良好的流动性和熔化性能。

Effect of BaO and Li2O on Melting Point and Viscosity of CaO-Based Refining Fluxes for Desulphuration

The melting point and viscosity of refining fluxes for desulphuration have been studied of which CaO (balance)-SiO₂ (22.4%)-Al₂O₂(11.6%)-CaF₂ (10%) refining slag was as basic flux, when the ratio of (CaO+RxO)/SiO₂ was fixed at 2.5(where RxO- BaO or Li₂O), the BaO or Li₂O added and replaced equivalent CaO content in flux. The results showed that the melting point and viscosity of fuxes decreased by added BaO or Li₂O in CaO basic slag effectively to improve the dynamics condition of metal- slag reaction. With 15% BaO or 15%Li₂O,the melting point of flux was 1267 ℃  or 1185 ℃ which were far lower than that of flux free additions- 1326 ℃,and the viscosity of flux at 1475 ℃ was 0.98 Pa · s or 0.51 Pa · s which were also far lower than that of flux free additions- 1.79 Pa · s to make the fluxes had excellent flu-  idity and melting capacity.