What kind of stone mill can't be dry ground?

Traditional stone mill is different from modern stone mill. The traditional chip stone mill dry grinding will cause pressure damage to the stone mill and destroy it.

A stone mill is usually made of two round stones. It is a machine for processing rice, wheat, beans and other grains into powder and slurry. Stone mills can be divided into three types: traditional flake stone mills, modern flake stone mills and modern roller stone mills. At first, it was driven by human or animal power. In the Jin Dynasty, China invented the water mill. The mill is flat and has two layers, and the junction of the two layers is textured. Particles enter the middle of the two layers from the upper holes.