I can help you with lithium dust at least.
It's used as a fuel.
-
-
I think Forestry uses ore-dictionary "dustAsh" for a few recipes (compost, fertilizer (which sadly isn't interchangeable with IC2 fertilizer), and bituminous peat), so if IC2 ashes were also ore-dictionaried as "dustAsh" instead of just "dustAshes", it could probably be used for that. I presume recycler-fodder doesn't count as a use, though (ashes aren't blacklisted for the recycler by default).
-
