I use the redstone engine to pump it out of the fertilizer to the generator.Hmm interesting, so they do, betcha a potato King Lemming fixes that
Anyway if you can sit and wait for a redstone engine powered machine to run at the speed it does you have a ton more patience than I do.
Edit - 15 minutes later my redstone engine powered pulveriser still hasn't started processing 1 ore .... yeah they might add power but they are nothing like practical to use