烧结矿靠液相固结形成，烧结过程中液相的形成和流动对烧结矿质量起着重要的作用；而随着资源的劣质化，烧结矿TFe品位呈现下降趋势。与Al2O3和SiO2等相比，MgO属于在烧结中主动性配加的成分，其大小影响着烧结液相的熔点、流动性和烧结矿品位。针对京唐混合料，首次采用高温共焦显微镜原位观察了MgO质量分数对烧结液相流动性的影响。研究发现，与不含MgO的混合料相比，配加质量分数为1.7%～2.0%的MgO后，混合料的液相初始形成和大量形成温度均高出50℃以上；液相流动速率也显著降低；烧结基础特性测试表明,混合料中MgO质量分数从2.3%降到0.3%后，流动性指数从0.7增大到1.9。在京唐烧结的工业实践表明，烧结实现烧结矿MgO质量分数从2.0%降至1.5%后，烧结矿指标有所改善。
Sinter ore was solidified by liquid phase during sintering process, the formation and fluidity of the liquid phase on sinter quality plays a crucial role in determining quality of sinter ore. With the deterioration of ore resource quality, the TFe content of sinter decreased. Compared with Al2O3 and SiO2, MgO belongs to ingredients added voluntarily, and amount of MgO affects the melting and fluidity of melts and TFe of sinter ore. According to Jingtang mixture, effect of MgO in sintering mixture on sintering high temperature properties was in situ observed by confocal lasering scanning mi-croscopy (CLSM for short)in the first time, and compared with sintering basic characteristics equipment. It can be found that, compared with blended ore without MgO, initial and massive melt forming temperature increase above 50℃when adding MgO with the mass percent of it from 1.7%to 2.0%, and fluidity velocity decreases apparently. As the mass per-cent of MgO decreased from 2.3%to 0.3%in sintering basic characteristics test, fluidity index increases from 0.7 to 1.9 levels. At last, mass percent of MgO in sinter of Jingtang reduced from 2.0%to 1.5%with better sinter quality.
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