grinding mill that can crush rocks to dust
Rocklabs#174; ring and puck mills Union College The ring mill is designed to crush small rock fragments to a finegrained powder that damage the vessel, but results in inefficient crushing and can even jam the ring and puck. Wipe away particles and dust from the rim and tops of the puck and ring. If it is still too coarse, put the lid back on and grind it for a longer time.