My newbie self bought some medium grind Pink Himalayan Salt before I read all the warnings about how sharp/scratchy it is in soap. I saved it by dissolving it in distilled water and then drying it. I heated it on the stove until it was almost dry and then finished it in the oven. My last step was to sieve it through a fine sieve. If you try this, make sure you completely dissolved the salt before you start heating the brine on the stove. Once the water starts to evaporate, trying to get any remaining chunks to dissolve is a losing battle.
The resulting salt is powdery fine and light pink in color:
The resulting salt is powdery fine and light pink in color: