Mechanism study of ultrasonic-assisted screening of fine powder materials

Abstract

The strong adsorption characteristics of fine power materials give rise to problems such as material conglomeration, blockage of sieve mesh and low process efficiency during screening, thus necessitating studies on processes like ultrasonic-assisted powder materials screening. In this study, based on the Derjaguin-Landau-Verwey-Overbeek theory, an energy balance model that takes into account the viscous force and ultrasonic vibration energy was first established; secondly, the force balance model was established as the breaking up of aggregates due to collisions between them during screening depends on the balance of forces on the aggregates; thirdly, the process of particle agglomeration and dispersion was studied via EDEM simulation; finally, the results of the experiment were used to verify the mechanism by which the ultrasonic auxiliary prevents material agglomeration and adsorption. The results showed that ultrasonic vibration can effectively scatter the particles, and improve the screening efficiency.