叶腊石干法研磨微结构变化特征  

Microstructural Alteration of Pyrophyllite by Dry Grinding

作　　者：严俊[1] 张俭[1] 方伟[1] 董楠[1] 邵佳明[1] 盛嘉伟[1] 

机构地区：[1]浙江工业大学化学工程与材料学院,浙江杭州310014

出　　处：《高校化学工程学报》2013年第2期344-347,共4页Journal of Chemical Engineering of Chinese Universities

基　　金：浙江省科技厅优先主题专项(2007C111042);浙江省研究生教育创新基金(1004)

摘　　要：采用红外光谱﹑场发射扫描电镜及X射线粉晶衍射对叶腊石不同干法研磨条件下微结构变化特征进行研究。结果表明:研磨过程中,叶腊石微粉粒径逐渐减小,但随着研磨强度进一步加大,粉体颗粒因其表面能的增大而出现团聚;不同研磨强度下,研磨后粉体的形貌存在明显差异。较大研磨强度下小颗粒粉体因团聚而呈'准球形'团聚体,且随着研磨的进行团聚颗粒粒径逐渐增大,低强度下粉体随着研磨时间的延长呈粒径减小行为,而片层状原粉形貌无明显改变;在研磨过程中叶腊石粉体红外光谱的变化表现出显著的惰性特征,该矿物中游离态二氧化硅是导致该红外惰性的直接原因。The effects of grinding on structural alteration of pyrophyllite were followed by infrared spectroscopy, field emission scanning microscopy and X-ray diffraction. The following results were obtained： The mechanical treatment by grinding produces a decrease in the particle size of original pyrophyllite with increasing time. With the increase of grinding intensities, the powder appears re-aggregation due to the high surface energy of active powder particles. The morphologies of pyrophyllite powder are different after grinding under different grinding intensities. The particles gradually have the characteristic of ＂torispherical＂ under high grinding intensities, and the agglomerates are constituted by a greater number of welded particles with the increasing grinding intensity. On the other hand, the original lamellar structure does not be changed as the particle size is reduced. During grinding, the IR spectra of the pyrophyllite powder particles exhibit outstanding characteristic of IR inertia, and the existence of free silica dioxide in the mineral is the direct cause of causing the IR inertia.

关 键 词：叶腊石 研磨 矿物组成 二氧化硅 

分 类 号：P574[天文地球—矿物学]