Article Dans Une Revue Powder Technology Année : 2025

A study on the impact of shifted feeding of a segregating binary mixture in continuous powder mixing

Résumé

Continuous mixing reduces the need to handle, transport or store mixtures. It may help reducing segregation issues and appear as a valuable alternative to the batch operations commonly employed. In the present work, we investigate the impact of the feed configuration on the continuous mixing process of two segregating products in an industrial mixer and a lab-scale mixer equipped with feeders that can be positioned at different points. To compare the different configurations, we are interested in three indicators: the amount of mixture produced during the transient phase at start-up, the internal composition profile of the powder mixture, as well as the homogeneity of the mixture at the mixer outlet once steady-state has been reached. The study of the mixture state within the mixers at steady-state shows that the composition profile does not depend on the equipment size, on the stirring device or on the particle size ratio. When powders are fed into different positions along the mixer, the powder fed the closest to the outlet hardly re-circulates forward because of the other powder already present. To limit transient regime at start-up, it is important that the first grains of each powder arrive at the equipment's outlet at the same time. We show that it is preferable to feed powders at the same point towards the mixer outlet to reach steady-state faster. We also find that the feed configuration has very little impact on the homogeneity of the mixture at the outlet once steady-state has been reached.

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hal-04869738 , version 1 (07-01-2025)

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Marie-Anne Batel, Carla Barcelo, Cendrine Gatumel, Henri Berthiaux. A study on the impact of shifted feeding of a segregating binary mixture in continuous powder mixing. Powder Technology, 2025, 452, pp.120564. ⟨10.1016/j.powtec.2024.120564⟩. ⟨hal-04869738⟩
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