What is residence time, and why does it matter?
When liquid is added to the tumbling feed, the fine particles layer onto the intermediate and large nuclei’s (some intermediates may adhere to larger particles as well). Continued growth occurs as some intermediate particles change role from nuclei to layer particles. As a significant number of collisions is required, this stage is slow. Equilibrium is reached when the number of collisions dislodging particles from layers balances the number adding particles. This is the point for the maximum stable granule size.
This explains why residence time is required for granule growth mechanisms.
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