▎ 摘　　要

NOVELTY - Preparing graphene comprises taking microcrystalline graphite as raw material to perform first intercalation treatment, second intercalation treatment and high-temperature puffing treatment to obtain expanded microcrystalline graphite, and then ultrasonically treating the obtained expanded microcrystalline graphite for twice, peeling the material, pressure filtering the stripping material, separating and cleaning. USE - The method is useful for preparing graphene. ADVANTAGE - The method has short production process, the cost is less, has no sulfur, and is suitable for batch preparation of graphene material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for batch production system comprising graphite puffing furnace, secondary ultrasonic device and filtration device, where the graphite puffing furnace is connected with the secondary ultrasonic device and the secondary ultrasonic device is connected with the filtering device, the graphite puffing furnace comprises a furnace body, a feeding device, a discharging device and a control device, where the expandable graphite passes through the feeding device to the furnace body and is then collected by the discharging device, where the discharging device is arranged above the furnace body, the feeding device is arranged under the furnace body, the furnace body is provided with a heating device, and the bottom of the furnace body is also provided with an airflow nozzle, the airflow nozzle further includes a gas source, an airflow pipe and an airflow control valve, where the gas source is connected with the airflow pipe, the air flow pipe is connected with the air jet nozzle, the air flow control valve is arranged in the air flow pipe, a feeding device is arranged above the air jet nozzle, and the spiral feeding machine is adopted, the control device includes a processor and a controller, where the processor is provided with a control panel and is connected with the controller, and the controller includes a first controller, a second controller and a third controller, where the first controller is connected with the airflow control valve of the airflow nozzle, the second controller is connected with the charging device, and the third controller is connected with the heating device, a cooling device is further arranged between the discharging device and the furnace body, the cooling device comprises a heat exchange tube and a water cooling tube, the one end of the heat exchange tube is connected with the furnace body, and the other end is connected with a discharging device. The angle between the heat exchange tube and the horizontal line is 45-90 degrees , and the water-cooled tube is spirally arranged on the heat exchange tube, the discharging device comprises multiple storage silos and connecting pipes, one end of the connecting pipes is connected with the heat exchanging pipe, and a cyclone separator is arranged, the other end is connected with the exhaust port, the connecting pipe is further provided with multiple sub-pipes which is connected with the storage tanks, the connecting pipe and the horizontal angle is 45-90 degrees ; the furnace body is further provided with a stirrer, where the stirrer is a screw stirrer, which is connected with the ball screw by a motor and a ball screw stirrer provides a linear motion up and down in the furnace body to drive the airflow in the furnace body to flow back, the feeding device is provided with a heating device, the secondary ultrasonic device comprises a pre-peeling device and a supersonic stripping device, the pre-stripping device comprises a first circulating system composed of a first mixing tank and multiple first ultrasonic reaction kettles, the first ultrasonic reactor comprises an ultrasonic device and a reaction kettle, the first mixing tank is provided with a feeding port which is connected with the graphite puffing, the upper end is connected with the first ultrasonic reactor through a first return pipe, the lower end is connected with the first ultrasonic reactor through the first ultrasonic reactor pipe, the first connection pipe is connected with the first discharge port, the first ultrasonic reactor pipe is provided with a centrifugal pump and a flow meter, the multiple first ultrasonic reaction vessels are arranged in height difference, where the lowest horizontal first ultrasonic reactor and the first connecting pipe are connected by the first discharge pipe, the ultrasonic stripping device comprises a second circulation system composed of a second mixing tank and a plurality of second ultrasonic reaction vessels, the second ultrasonic reaction tank comprises an ultrasonic device and a reaction kettle, the upper end of the second mixing tank is connected with the second ultrasonic reactor through the second return pipe, and the lower end is connected with the second connecting pipe, the second connecting pipe is provided with a feeding port connected with the first discharging port, a centrifugal pump, a flow meter and a second discharging port connected with the filtering device, the second ultrasonic reactor is connected with the horizontal position sequentially, and is provided with an exhaust valve, and is connected with a second connecting pipe through a second discharge pipe, and the filtering device is a plate and frame type filter press.