▎ 摘　　要

NOVELTY - Preparing graphene, comprises (i) adding crystalline flake graphite, concentrated sulfuric acid, sodium nitrate and potassium permanganate, stirring, filtering, washing, and drying to obtain graphite oxide, and (ii) adding graphite oxide into specific high-temperature vacuum continuous carburizing and quenching furnace, then introducing nitrogen gas for 1-10 hours for expanding graphite, after specific high-temperature vacuum continuous carburizing and quenching furnace in the electronic ignition system, carrying out graphite explosion and nano-graphene separation to obtain nano graphene. USE - The method is useful for preparing graphene. ADVANTAGE - The method utilizes strong graphite oxide expansion, and exerts pressure between graphite layers, which is greater than Van der Waals force to strip the crystalline laminated structure of the graphite; and can prepare graphene high-efficiently through the controllable explosion way. DETAILED DESCRIPTION - Preparing graphene, comprises (i) adding crystalline flake graphite (1 parts), concentrated sulfuric acid (2-50 parts), sodium nitrate (0.3-1) and potassium permanganate (2-5), stirring for 2-100 hours, filtering, washing, and drying to obtain graphite oxide, and (ii) adding graphite oxide into specific high-temperature vacuum continuous carburizing and quenching furnace, where the first stage temperature is controlled at 1100 degrees C, and the pressure is maintained at 1-10 atmospheric pressure, then introducing nitrogen gas for 1-10 hours for expanding graphite; where the second stage temperature is 400-500 degrees C, and oxygen oxidation of 1-10 hours; where the pressure in third stage is maintained at 1-10 atmospheric pressure, the mass percentage of oxygen is 50-80% and hydrogen gas mixture is 20-50%, after specific high-temperature vacuum continuous carburizing and quenching furnace in the electronic ignition system, the ignition explosive is 1-100 times, explosion temperature is 3000 degrees C, carrying out graphite explosion and nano-graphene separation to obtain nano graphene. An INDEPENDENT CLAIM is also included for a specific high-temperature vacuum continuous carburizing and quenching furnace for preparing graphene, comprising crucible moving guide rail, sliding angle regulator, hot insulation, gas storage tank, gas exchange chamber, heating chamber, oxidation chamber, controlled explosion chamber and ignition control system. The continuous furnace cavity is arranged in order of nitrogen replacement chamber, heating chamber, oxygen displacement chamber, oxidation chamber, and controlled explosion cavity, where each cavity is set between the hot insulation, and crucible moving guide rail through the cavity and forms a rectangular closed loop set with a sliding angle regulator. The crucible moving guide rail is arranged on the rectangular four corners provided with a crucible and the crucible inlet and outlet. The nitrogen storage tank is connected with the nitrogen replacement chamber. The oxygen storage tank is connected with oxygen replacement chamber. The oxygen storage tank and hydrogen tank with controllable explosion cavity is provided with an electronic ignition device. The electronic ignition device is connected with the electronic ignition system and a control device. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the specific high-temperature vacuum continuous carburizing and quenching furnace.