【作者】 李杰；

【导师】 姜茂发； 孙丽枫；

【作者基本信息】 东北大学 ， 钢铁冶金， 2014， 硕士

【摘要】 CaO-SiO2-Al2O3-MgO-TiO2五元渣系是冶金工业中的重要渣系,对其液相线温度的研究不仅可以对已有含钛渣系相图液相线进行验证、优化,丰富和完善相图信息,而且可以为含钛高炉渣和相关冶金渣系的冶炼提供重要依据,对含钛高炉渣的资源综合利用和Ti02矿物的提取也具有重要的指导意义。本研究采用热丝法结晶性能测定仪,测定了不同w(CaO)/w(SiO2)下CaO-SiO2-10%Al2O3-MgO-5%TiO2渣系的熔化温度,并以热力学知识为基础对实验数据进行处理；同时,通过高温平衡实验和SEM-EDS、XRD等检测手段,测定了CaO-SiO2-10%Al2O3-MgO-5%TiO2渣系的相平衡关系。得到如下结论：(1)随着w(CaO)/wSiO2)的增加,渣系的熔化温度逐渐增大。相同w(CaO)/w(SiO2)下,10%MgO含量时渣系的熔化温度均高于5%MgO含量渣系的熔化温度。(2)在各渣系成分条件下,熔化温度的实验测定值与文献中相图值吻合较好,证明使用热丝法测定渣系熔化温度的方法可行性。(3)依据热力学原理拟合得到MgO分别为5%和10%条件下,不同初晶区内熔化温度随w(CaO)/w(SiO2)变化的函数方程。(4)利用实验数据和液相线温度拟合方程的结果,绘制出特定初晶区内的液相线。(5)通过1300℃条件下CaO-SiO2-10%Al2O3-MgO-5%TiO2渣系的平衡实验,确定相图中初晶区的平衡相组成L+(C2MS2,C2AS)SS,这与文献中相图信息一致。更多还原

【Abstract】 CaO-SiO2-AbO3-MgO-TiO2 system is one of the most important slags in metallurgy process. Investigation on the liquid temperature of CaO-SiO2-Al2P3-MgO-TiO2 system will not only validate and optimize liquidus of the titanium bearing slag system diagram, enrich and perfect phase information, but also provide an important basis for the smelting of titanium bearing blast furnace slag and metallurgical slags, having an important guiding significance in comprehensive utilization of slag resources and extraction of TiO2 minerals.In the present work, the liquidus temperature was concluded by the melting temperature which determined by the single hot thermocouple technique for the CaO-SiO2-10%Al2O3-MgO-5%TiO2 phase diagram system. The phase equilibrium relationship was determined experimentally at 1300℃ using the quenched technique followed by XRF、XRD and SEM-EDS analysis. The results in this paper as follows:(1) With the increase of w(CaO)/w(SiO2), The melting temperature increase gradually, and the melting temperature of 10% content of MgO was higher than 5% content of MgO at the same w(CaO)/w(SiO2).(2) The melting temperature from present research was in good agreement with the result from phase diagram reported in Slag Atlas, which proves the feasility in determination of melting temperature by single thermal couple method.(3) The relationship of melting temperature and w(CaO)/w(SiO2) was constructed based on the thermodynamic principle for different primary crystal regions.(4) The liquidus in specific primary crystal region were plotted based on the calculated result from the equations and experiment data for different primary crystal regions.(5) The phase of L with (C2MS2,C2AS)ss was determinated for CaO-SiO2-10%Al2O3-MgO-5% TiO2 system at 1300℃, which was in consist with the reported phase diagram.更多还原