Fluidization of nanoparticle agglomerates is a promising technique to process nanoparticles. However, possible elutriation of small agglomerates may cause significant loss of bed material. To obtain the elutriation behavior under stable operation, in this study the elutriation fraction of silica nanoparticle agglomerates is measured in a vibro-fluidized bed, which is operated for several hours. Among conditions with different fluidizing gas velocities, $U_g$, and vibration strength, $\mathrm{\Lambda }$, the lowest elutriation fraction measured is around 5% after 7-hour fluidization. The elutriation fraction increases significantly with $U_g$, while varies slightly with $\mathrm{\Lambda }$. To help elucidating the elutriation behavior, the agglomerates at three different locations (bed surface, splash zone, and bed outlet) are sampled and their size distributions are determined. The elutriation rate constant is found to be much smaller than the literature results for ordinary particles, and the reasons are discussed in detail. Finally, an empirical correlation considering size distribution is proposed to fit the elutriation rate constant for the conditions in this study.

纳米粒子团聚体的流化是一种很有前途的纳米粒子加工技术。然而，小结块的可能淘析可能会导致床材料的显着损失。为了获得稳定操作下的淘析行为，在本研究中，二氧化硅纳米颗粒团聚体的淘析分数是在振动流化床中测量的，该床运行了几个小时。在不同流化气体速度的条件下，${ü}_G$, 和振动强度, $\mathrm{\Lambda }$，在 7 小时流化后测得的最低淘析分数约为 5%。淘析分数显着增加${ü}_G$, 而略有不同 $\mathrm{\Lambda }$. 为了帮助阐明淘析行为，对位于三个不同位置（床表面、飞溅区和床出口）的团块进行采样，并确定它们的尺寸分布。发现淘析速率常数远小于普通颗粒的文献结果，并详细讨论了原因。最后，提出了考虑尺寸分布的经验相关性，以拟合本研究条件下的淘析速率常数。