三七超微粉体与细粉、不同目数范围粉体的粒度分布和显微形貌特征的比较

通过比较三七超微粉体、细粉(三七常规饮片)以及不同目数范围粉体(三七细粉经多次筛分得到的粉体)在粒度分布、显微形貌特征方面的差异,探讨了超微粉碎技术应用于中药三七加工的优势。应用激光粒度分析仪对三七超微粉体与细粉、不同目数范围粉体的粒度及其分布进行表征,观察其显微形貌特征。粒度分布测试和显微形貌观察的结果表明,超微粉粒度分布在0.30～24μm,大部分粉体达到了10μm以下,呈对称的单峰分布,引起团聚的作用力为各种表面力,说明超微粉体均匀度高质量易控。三七细粉及不同目数范围的粉体粒度分布范围在2～190μm,分布不对称,引起团聚的作用力为重力的等质量力,说明其均匀度差,质量难以控制。

Comparison of Particle Size Distribution and Microscopic Characters of Ultrafine Powder and Fine Powder and Different Mesh Screen Powder of Panax Notoginseng

To compare the differences about particle size distribution and microscopic characters of ultrafine powder and fine powder and different mesh screen powder of panax notoginseng,for forcasting advantage of technology of ultrafine pulverization for panax notoginseng.The ultrafine powder and fine powder and different mesh screen powder were observed and analyzed by laser particle size analyzer and electronmicroscope.The test results of the particle size and particle size distribution and microscop-ic character suggested that the diameter particle of ultrafine powder rang-ing from 0.3～24 μm,most of it belowing 10 μm,and showed unimodal distribution.The forces that caused agglomeration were surface forces.The result showed that the ultrafine powder of panax notoginseng was of high uniformity and its quality was easy to be controlled.The diameter particle of fine powder and different mesh screen powder ranging from 2～190 μm,the distribution was dissymmetry.The forces that caused agglomeration were gravity and some other mass force.The results showed that the fine powder and different mesh screen powder of panax notoginseng were of low uniformity and its quality was hard to be controlled.