辉钼矿微波活化作用机理

摘要

在惰性气体保护下,研究微波活化对辉钼矿氧化焙烧性能的影响.采用激光粒度分析仪、热重(TG)分析、X射线衍射(XRD)、扫描电子显微镜(SEM)等手段对微波活化前后辉钼矿的比表面积、氧化特性、品格常数、微观结构及形貌进行分析表征,探究辉钼矿微波活化作用机理.结果表明,微波活化可以有效降低钼焙砂残硫量,增大辉钼矿比表面积.随着微波活化时间的延长,辉钼矿主成分MoS2的晶胞体积、晶粒尺寸均减小,微观应变略微增大.同时,辉钼矿表面形貌更加松散,但层状结构并未改变.微波活化显著改变了辉钼矿的氧化特性,温度超过547℃时,随着活化时间的延长,辉钼矿转化率变大,反应速度加快,600℃的失重率从5.59％增加到6.92％.%The effect of microwave activation on the properties of oxidation roasting molybdenite was investigated under the protection of inert gas.The specific surface area,oxidation properties,lattice constant,microstructure and morphology of molybdenite were characterized by the laser particle size analyzer,thermogravimetric (TG) analysis,X-ray diffraction (XRD),scanning electron microscope (SEM).The results show that the microwave activation can effectively reduce the residual amount of sulfur of molybdenum calcine and average particle size of molybdenite,while increasing the specific surface area of molybdenite.As the extension of microwave activation time,crystal cell volume and grain size of MoS2 were reduced,the micro strain was increased slightly.At the same time,the surface topography of molybdenite becomes looser,but the layered structure does not change.In addition,the oxidation property was changed significantly,as the extension of activation time,molybdenite conversion rate becomes bigger after 547 ℃,and the rate of weightlessness is increased from 5.59％ to 6.92％ at 600 ℃.