(1. 苏州大学 沙钢钢铁学院，苏州 215021；
2. 上海大学 省部共建高品质特殊钢冶金与制备国家重点实验室，上海 200072；
3. 河北工业职业技术学院 材料工程系，石家庄 050091)
摘 要: 基于熔渣结构的离子与分子共存理论和Butler方程建立了MgO-B2O3-SiO2-CaO-Al2O3体系表面张力计算模型，计算了该体系及其子体系表面张力值，考察了熔渣表面张力随熔渣组分的变化规律，以期为富硼渣调控和综合利用提供参考。结果表明：本模型计算的熔渣表面张力值与实验值吻合较好，模型平均相对误差为9.03%。含B2O3的二元体系中，B2O3组元显著降低熔渣表面张力，纯氧化物表面张力值与形成氧化物阳离子的静电势及氧化物中离子键的分数有关。含B2O3的多元体系中，熔渣表面张力随着B2O3含量的增加而显著降低，但随着MgO和SiO2质量比、CaO含量和Al2O3含量的增加而逐渐增大，且CaO和Al2O3含量对含B2O3渣表面张力的影响基本相当。
关键字: MgO-B2O3-SiO2-CaO-Al2O3熔渣；表面张力；组分含量；共存理论；计算模型
（1. School of Iron and Steel, Soochow University, Suzhou 215021, China;
2. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China;
3. Department of Materials Engineering, Hebei Institute of Vocational and Technique, Shijiazhuang 050091, China）
Abstract:Based on the coexistence theory of ions and molecules of molten melt structure and Butler’s equation, a thermodynamic model was developed to establish the surface tension of MgO-B2O3-SiO2-CaO-Al2O3 system and its sub-system. The relationship between the composition and surface tension was investigated, which provided reference for the regulation and comprehensive utilization of boron-rich slag. The results indicate that the calculated value of surface tension agrees well with the literature data, and the average error is about 9.03%. The surface tension of molten slag decreases with increasing the B2O3 component significantly in binary system. The surface tension value of pure oxide is related to the electrostatic potential of cations and the ion bond percentage in oxide. The surface tension in multi-component system increases with increasing the mass ratios of MgO to SiO2, the CaO content and Al2O3 content, and the effect of CaO on surface tension is the same as that of Al2O content.
Key words: MgO-B2O3-SiO2-CaO-Al2O3 molten slag; surface tension; component content; coexistence theory; calculating model
