Abstract: Effects of B2O3 on melting temperature of two CaO-based refining slag series with low basicity [ ( CaO)/ (SiO₂)=3 ~4] and high basicity [ (CaO)/(SiO₂)= 5 〜7. 5 ] have been studied. Results indicate that B₂O₃ is more available than Al₂O₃ and CaF₂ to decrease the melting temperature of CaO-based refining slag, for low basicity slag, it is effective to decrease melting temperature of slag with replacing CaF₂, Al₂O₃ or SiO₂ partly by B₂O₃ ； for high basicity slag, with replacing CaF₂ by B₂O₃, the extra-low melting temperature CaO-based refining slag with high ( CaO) /( SiO₂) and high (CaO)/( Al₂O₃) could be got, it is available to increase the slag forming rate, the ability of slag for desulfurization and dephosphorization, and the ability of slag to absorb deoxidation products by silicon and aluminium.

摘要： 研究了B₂O₃对低碱度[(CaO)/(SiO₂)=3～4]和高碱度[(CaO)/(SiO2)=5～7.5]两个系列CaO基精炼渣熔化温度的影响。结果表明,用B₂O3比用Al₂O₃和CaF₂更有效降低CaO基精炼渣系的熔化温度,对低碱度渣系,B₂O₃替代渣中的部分CaF₂、Al₂O₃以及SiO₂,都能有效降低渣的熔化温度;对高碱度渣系,B₂O₃替代CaF₂作助熔剂时,可实现在高(CaO)/(SiO₂)和(CaO)/(Al₂O₃)下造具有超低熔化温度的CaO基精炼渣,既可提高造渣速度,又可提高渣的脱硫磷能力和吸收硅、铝脱氧产物的能力。

关键词: B₂O₃, CaO基精炼渣, 熔化温度, 无氟助熔剂