Abstract: The effect of basicity, BaO(6%-14% ), CaF₂ (0-10% ) and A1₂O₃ (18%-28% ) on semispherical melting-point and melting rate of basic refining slag series CaO-SiO₂ -A1₂O₃  -MgO-CaF2 has been studied with CQKJ-III mineral slag melting temperature measure device and MTLQ-RD-1300 semispherical melting point (melting temperature) and melting rate comprehensive measuring system and by orthogonal examination. Results show that the influence factors on melting point of high basicity refining slag are CaF₂, BaO, A1₂O₃  and basicity R and weaken sequentially, and the sequence of influence factors on melting rate are basicity R, A1₂O₃ , CaF₂ and BaO； it is available by increasing refining slag basicity and adding suitable A1₂O₃  to decrease melting point of refining slag and increase melting rate, while the refining slag melting point decreases and its melting rate increases in varying degree by adding BaO and CaF₂; with basicity 4-5, 10%-14% BaO, 23%-28% A1₂O₃  and 5%-10% CaF₂, the refining slag has lower melting point ( about 1340 ℃ ) and larger melting rate (melting time ＜50 s); with reducing the size of high basicity refining slag particles the melting point of slag decreases and the melting rate increases.

Key words: CaO-SiO₂-Al₂O₃-MgO-CaF₂ Base Refining Slag, BaO, Ingredient, Size, Melting Point, Melting Rate

摘要： 使用CQKJ-Ⅲ矿渣熔化温度测定仪和MTLQ-RD-1300半球熔点熔速综合测定系统,通过正交实验研究碱度、BaO(6%~14%)、CaF₂(0~10%)和Al₂O₃(18%~28%)对基础精炼渣系CaO-SiO₂-Al₂O₃一MgO-CaF₂半球熔点(熔化温度)和熔化速率的影响。结果表明,对高碱度精炼渣熔点的影响因素为CaF₂、BaO、Al₂O₃、碱度(R)依次减弱;对熔速的影响因素为碱度(R)、Al₂O₃、CaF₂、BaO依次减弱,提高精炼渣碱度同时添加适量的Al₂O₃可以降低精炼渣的熔点和提高熔速,BaO、CaF₂的加入也能不同程度的降低精炼渣的熔点,提高精炼渣的熔速;当碱度为4~5,BaO 10%~14%,Al₂O₃ 23%~28%,CaF₂ 5%~10%时,精炼渣的熔点比较低(约1340℃),熔速比较大(熔化时间＜50 s);减小高碱度精炼渣的粒度可以降低熔渣的熔点和提高熔化速率。

关键词: CaO-SiO₂-Al₂O₃-MgO-CaF₂基精炼渣, BaO, 组分, 粒度, 熔点, 熔化速率