▎ 摘　　要

NOVELTY - The method involves ball-milling a graphite material to form ball-milled graphene powder (1), where the graphite material is in form of a helix. The ball-milling is performed to make graphene powder particle to be of size of hundred nanometer or smaller. The graphene powder is dispersed in a solvent to form a suspension (4). Magnetic impurities (2) are separated during stirring of the suspension using a magnet (3), where the magnetic impurities are incorporated into the graphene powder during ball-milling from balls and dispersed in the suspension. USE - Method for purifying a ball-milled graphene nano-powder or ribbon. ADVANTAGE - The method enables sweeping of light-weight graphene to the magnetic impurities, which are finely or minutely dispersed so as to stick to the magnet, thus purifying graphene powder easily and effectively by removing the magnetic impurities incorporated into the graphene powder. DETAILED DESCRIPTION - The solvent is alcohol, acetone, dimethylformamide, or toluene. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic illustration of a method for purifying graphene powder. Ball-milled graphene powder (1) Magnetic impurities (2) Magnet (3) Suspension (4)