elutriation

https://doi.org/10.1351/goldbook.E02053
The process of separating the lighter particles of a powder from the heavier ones by means of an upward directed stream of fluid (gas or liquid).
Source:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2186 [Terms] [Paper]