Hold on loosely
A binder manufacturer tests agglomeration binders to create gypsum and limestone pellets strong enough to withstand handling, but not too strong to break down when needed.
Pilot tests are a good way learn about the agglomeration properties of your powder. Such tests will not only help you learn more about its handling characteristics, they can also show you what it will take to make your powder into pellets. Tests can show you what agglomeration equipment would work best and whether you will need to use a binder to create just the pellet you want.