摘要
通过X射线衍射、颗粒粒度测量、红外光谱以及N2吸附技术分析干磨对一水硬铝石结构的影响。球磨可增加一水硬铝石的BET(BrunauerEmmetTeller)比表面积。但随着球磨时间的延长,颗粒粒径的减小速率会逐渐降低。球磨2h后,一水硬铝石颗粒粒径的减少存在一个极限。研究表明,球磨过程会引发颗粒的团聚。随着球磨时间的增加,所引发的机械化学效应显著加剧一水硬铝石的X射线衍射谱中各晶面衍射峰强度的降低,但在1～2h内没有新的物相生成,一水硬铝石的αAlOOH结构保持完整,这对于一水硬铝石深加工制备功能矿物材料十分有利。N2吸附研究表明,球磨12h后一水硬铝石颗粒的孔径比球磨6h和原始样品的孔径稍小,这充分说明干磨有利于颗粒微孔结构的形成,为制备催化和多孔材料奠定了较好的基础。红外分析结果显示,机械化学处理后一水硬铝石的特征峰也会发生一定的变化。
The effects of dry grinding of diaspore (α-AlOOH) on the structure of diaspore were investigated by means of X-ray diffraction (XRD), particle size measurement, infrared (IR) spectroscopy and nitrogen adsorption techniques. Grinding of diaspore can increase the Brunauer-Emmet-Teller surface area of diaspore. As the grinding time is prolonged, the rate of size reduction decreases gradually. The size reduction of the original diaspore particle appears to reach a limit after 2 h grinding. Particle size data suggest that moderate aggregation occurs during grinding. The mechanochemical effect obviously promotes the decreases in reflection intensities of XRD with the increase the grinding time, but no new phase appears between 1 h to 2 h grinding, and the structure of α-AlOOH is still retained perfectly. N2 adsorption study indicates that diaspore ground for 12 h shows a little smaller average pore diameter than the sample ground for 6 h and the original diaspore as well. This shows that the grinding is favorable for the formation of microstructure pores. IR spectroscopy analysis indicates that some change occurs in the bands of diaspore after mechanochemical treatment.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2005年第6期674-677,共4页
Journal of The Chinese Ceramic Society
基金
国家重大基础研究发展规划项目(G1999064901)
国家自然科学基金(50304014)资助项目。
关键词
一水硬铝石
干磨
机械化学效应
氮气吸附
微孔结构
Agglomeration
Grinding (machining)
Infrared spectroscopy
Particle size analysis
X ray diffraction analysis
