what is the proses of getting coal ready for commercial use.

l dont think there is one coal just burns straight out of the ground

remove dirt.

The coal needs to be prepped for shipping to keep coal dust down during shipment. It also needs to be graded (by size) or made in to a uniform size for use, this operation includes the removal of most of the material that is not coal.
Those are the only two things that l know of that are done across the industry to prepare coal for commercial use.

Is there a coal fired airplane? Must be hell to be a stoker on that one.