▎ 摘　　要

NOVELTY - The method involves arranging a probe of an ultrasonic generator on an inner wall of the middle and lower portion of a reaction kettle. The reactor is filled with precisely metered high-mesh graphite powder and liquid carbon-di-oxide mixture at one time. The ultrasonic generator is started while stirring. The discharge port is closed after a preset time after adjusting to the same vibration frequency as graphite and liquid carbon-di-oxide mixture. The pressure-reducing discharge port is opened while stirring. The free carbon atom and the carbon-di-oxide suspension liquid of the rated quantity are smoothly and rapidly poured into the settling tray holder, or the free carbon atom and the liquid carbon-di-oxide suspension liquid with the rated flow rate are released into the sedimentation device. USE - Ultrasonic breaking graphite powder method before preparing graphene by paving sedimentation method. ADVANTAGE - The method is featured with more balanced and thorough coverage than direct mechanical demolition, more concentrated and powerful localized energy, higher demolition rate. The time and energy for performing the ultrasonic breaking graphite powder are saved. The method is featured with good value for promotion and application.