So first off, if you pour a bucket of yellorium on the ground, when you pick it back up with a bucket, it magically turns into water.

Secondly, I am not sure if it is because a bucket of yellorium is not being properly registered as a fluid or what, but you cannot set a fluid filter with a bucket of yellorium like you can with all other buckets of materials. I am wanting to setup a filtering system for my metals using pipes, however being unable to set a filter for yellorium means that I am unable to include it in my design at this time.

if you smelt yellorium in a Tinkers Construct smeltry, you get molten yellorium. you can then place a bucket in the casting table, and fill it with said molten yellorium

sigh
The Yellorium fluid isn't meant to ever be outside of the reactor itself, however it seems that the partial implementation of the fluid is causing problems. @erogenousbeef has to fully implement the yellorium fluid.

how did you get this bucket of yellorium?!
yellorium turns into liquid inside a reactor and pulling the liquid out is unheard of!

Or make it not to be placed in world.