▎ 摘　　要

NOVELTY - The utility model relates to a mechanical method of graphene preparation field, an industrial grinding sand mill for preparing graphene, wherein it is mainly composed of control system (1), a main transmission system (3), a feeding system (2); layered milling system four parts, wherein the layered grinding system is set on the grinding cylinder (4), a grinding cylinder (5) and lower grinding cylinder (6) is three-layer grinding cylinder, each rotor, the upper grinding cylinder (4), a grinding cylinder (5); the interlayer of the lower grinding cylinder (6) separated by the first clapboard (7), the second clapboard (8), the clapboard is distributed holes, the size should allow meets the size requirement of graphite by the milling medium cannot pass through; the grain diameter of the grinding medium increases from upper layer to the middle layer to the lower layer, or mixed solution of water and organic solvent by the graphite to prepare graphene slurry, then put into hierarchical grinding system through the lower grinding cylinder (6), a grinding cylinder (5), upper grinding cylinder (4), discharged by the guide of the guide groove (9).