lithium salts are not particularly value on a less than industrial mining scale.
Just trying to give you some advise, it has less to do with your process and more to do with the screening size of the material you run. When it comes to really recovering as much as you can, uniform particle size is more important than the particle size itself. If you screen out say 80 mesh minus you should get a much better result than trying to mill it down to a flour like base on its own. Densimetric separation works really well when particle size is as uniform as possible. Don't take that as me telling you what to do, that's me giving you some insight on what I do and we are recovering 99.97% the product we want.
I wanted to add this, if your looking to do this mechanically and not by hand, get a small spiral classifier if you dont have one, they are good at doing product with very close densities.
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