新型偏心振动磨对碳酸钙粉料的机械力化学激活效应  

EFFECT OF MECHANOCHEMICAL ACTIVATION ON CALCIUM CARBONATE IN A RECENTLY DEVELOPED ECCENTRIC VIBRATING MILL

作　　者：王燕民[1] 潘志东[1] 李竟先[1] FORSSBERG E GOCK E 

机构地区：[1]华南理工大学材料科学与工程学院,广州510640 [2]Department of Chemical & Metallurgical Engineering [3]Institut für Aufbereitung und Deponietechnik, TU Clausthal

出　　处：《硅酸盐学报》2004年第4期436-441,447,共7页Journal of The Chinese Ceramic Society

摘　　要：评价了一种新型偏心振动磨研磨碳酸钙粉料时的机械力化学激活效应。与传统振动磨所产生的单向振动不同,这种新型磨机可以同时进行高振幅的多向振动,使碳酸钙粉料高度松散并经受研磨介质激烈机械粉碎和激活。通过X射线衍射仪、Fourier变换红外分光镜、扫描电镜、X射线光电子光谱仪和氮吸附比表面仪等实验手段对激活的粉料样品的晶体结构和颗粒表面进行了分析研究,用热重/差示热分析和差示扫描量热法检测了未激活和激活粉料的热效应。研究结果表明:机械力化学激活的碳酸钙颗粒的结晶度降低,颗粒表面能增加,热分解温度降低以及反应活性增强。激活颗粒的过余焓随着激活时间的增加而增加,过余焓与晶体形变有关。The mechanochemical activation effect of calcium carbonate milled in a recent developed eccentric vibrating mill(ESM) was evaluated. The characteristics of ESM such as the considerably higher amplitudes and multi-direction vibration over conventional vibration mills were outlined. It is shown experimentally that the rate and extent of grinding is effective for size reduction and mechanochemical activation. The structural transformations and the surfaces of the solids sample after activation were studied by using X-ray diffraction (XRD), Fourier transform Infrared spectroscopy (FTIR), scanning electron microscopy (SEM), BET specific surface area test and X-ray photoelectron spectroscopy (XPS) as well. The thermal behaviors of the inactivated and activated solids were examined by thermogravimetry/differential thermal analysis (TG/DTA) as well as differential scanning calorimetry (DSC). The results indicate that the mechanochemical treatment in the mill results in a progressive loss in crystallinity and the increase of the surface energy, a decrease of the decomposition temperature and the increase of the reactivity as well. In addition, the excess enthalpy content in the activated solids increases with an increase of activation time (or energy input) in the ESM. The increase in the excess enthalpy is related to the total crystallographic deformation and some phase transformation.

关 键 词：粉碎设备 偏心振动磨 机械力化学 碳酸钙 激活效应 

分 类 号：TQ172.611[化学工程—水泥工业]