熔分赤泥熔渣纤维化过程中熔体性能研究

以熔分赤泥为研究对象,探究熔分赤泥熔渣纤维化过程中熔体性能的变化规律,采用炉渣熔点熔速测定仪研究熔分赤泥熔化过程及熔化温度,采用FactSage热力学软件模拟熔分赤泥熔渣冷却过程中矿物析出种类、含量及开始析晶温度,采用X射线衍射仪和场发射扫描电子显微镜研究熔分赤泥熔渣不同温度下矿物组成与显微形貌,采用熔体物性综合测定仪研究熔分赤泥熔渣降温过程中的黏度变化。结果表明,熔分赤泥的熔化温度为1 236 ℃,熔分赤泥熔渣冷却过程中,1 300 ℃开始析出晶体,首先析出晶相为镁铝尖晶石(MgAl₂O₄)。此外,综合分析熔分赤泥熔渣熔体性能,明确利用熔分赤泥熔渣纤维化制备无机纤维时的温度应高于1 433 ℃。

Melt Properties of Melting-Separated Red Mud Slag During Fiberization

Taking melting-separated red mud as the research object, the change law of melt properties was explored in the process of melting-separated red mud slag fibrosis. The melting process and melting temperature of melting-separated red mud were studied by slag melting point and melting rate tester. FactSage thermodynamic software was used to simulate the mineral precipitation type, content and initial crystallization temperature during the cooling process of melting-separated red mud slag. X-ray diffractometer and field emission scanning electron microscope were used to study the mineral composition and micro-morphology of melting-separated red mud slag at different temperatures. The viscosity change of melting-separated red mud slag during the cooling process was studied by using the comprehensive tester of melt physical properties. The results show that the melting temperature of melting-separated red mud is 1 236 ℃. During the cooling process of melting-separated red mud slag, crystals begin to precipitate at 1 300 ℃. At first, magnesium aluminate spinel (MgAl₂O₄) is precipitated. In addition, after comprehensive analysis of melt properties of melting-separated red mud slag, it is clear that the temperature of preparing inorganic fiber by fiberizing melting-separated red mud slag should be higher than 1 433 ℃.