▎ 摘　　要

NOVELTY - Preparing graphene comprises (i) taking carbonate and polymer compound, adding into a high speed mixer, high-speed stirring and dispersing to obtain carbon precursor; (ii) carrying out extrusion of the carbon precursor to form sheet; (iii) washing the sheet in an aqueous solution, shaking, placing into a tube furnace and drying; (iv) heating the tubular furnace under inert gas at 800-1000 degrees C, adding reaction catalyst, reacting and cooling to obtain graphene primary product; (v) reacting the graphene primary product in hydrochloric acid solution, washing and drying. USE - The method is useful for preparing graphene (claimed). ADVANTAGE - The method is simple, utilizes raw material source which are economical, produces high yield and high purity, and realizes large-scale production. DETAILED DESCRIPTION - Preparing graphene comprises (i) taking carbonate and polymer compound of mass ratio 8:(2-3), adding into a high speed mixer, high-speed stirring and dispersing at a speed of 2000-3000 revolutions/minute for 5-10 minutes to obtain carbon precursor; (ii) pumping the carbon precursor into the extruder feed mouth, dispersing in screw turn set by the feed end to end, processing in screw thread component, mixing screw thread component, devolatilization screw thread component and dispersing screw thread component, where the reaction segment temperature is 130-180, dispersing carbon precursor by screw thread component to form network structure of carbonate coating polymer compound, kneading in screw thread component, setting the reaction temperature of 180-220 degrees C, introducing carbon precursor at high temperature stretching conditions into the thermoplastic material, devolatilization screw thread component, removing volatile substances at high temperature heat conditions to form porous structure, where the set temperature is 200-230 degrees C and carrying out extrusion to form sheet; (iii) washing the sheet in an aqueous solution, shaking, placing into a tube furnace in air atmosphere and drying at 180-250 degrees C for 15-30 minutes; (iv) heating the tubular furnace under inert gas at 800-1000 degrees C, adding reaction catalyst, reacting for 120-150 minutes, cooling to 25 degrees C under an inert gas atmosphere to obtain graphene primary product; (v) reacting the graphene primary product in hydrochloric acid solution for 8-12 minutes, washing with water until neutral and drying to obtain graphene, where the carbonate is calcium carbonate, magnesium carbonate, barium carbonate, sodium carbonate or aluminum carbonate, the polymer compound is polyvinyl pyrrolidone, polyacrylamide, polyethylene terephthalate, polyethylene glycol, styrene-butadiene-styrene triblock copolymer or polyimide, and the catalyst is cesium salt, aluminum isopropoxide, manganese dioxide, antimony trioxide or cuprous chloride.