▎ 摘　　要

NOVELTY - A method for producing low-cost graphene involves (S1) preparing graphite, recycled plastic material, non-metal particles and additive, (S2) sequentially putting into a ball mill for grinding to obtain submicron graphene, (S3) putting into a high-pressure fluidized bed, continuously introducing high-temperature steam into the fluidized bed, continuously introducing the high-temperature steam at a super-high speed of 1000 m/second when the pressure of the materials in the fluidized bed is 1.0-1.3 MPa, keeping the pressure in a storage bin in the fluidized bed to operate at a high speed, and realizing stable operation, and (S4) putting the obtained polymerized and decomposed spherical material into a high-speed high-pressure shearing machine for secondary shearing, putting the sheared material into a catalytic combustion device, burning under lower ignition temperature, and fully combusting to obtain a graphene plastic product. USE - The method is useful for producing low-cost graphene, which is used in polymer materials (claimed). ADVANTAGE - The graphene is no longer in a free state under the action of polymers after thermal decomposition of the recycled plastic materials, and this is due to super large surface area and extremely light weight of graphene, so that the graphene is wrapped on the surface of inorganic fillers and linked to each other by polymer materials. The graphene makes plastic products have electrical and thermal conductivity of metal materials, and makes plastic polymer materials have stronger mechanical effects. DETAILED DESCRIPTION - A method for producing low-cost graphene and applying on polymer material involves (S1) preparing 1-5% graphite, 5-15% recycled plastic material, 70-90% non-metal particles and 4-10% additive, (S2) sequentially putting the prepared raw materials into a ball mill for grinding, using a classifier and a ball mill to form a closed circulation, sending the ground material to the classifier, where the particle size of the classifier is D97, and collecting the material selected by the classifier to obtain submicron graphene with an average particle size of 1.5 μm, (S3) taking out the submicron graphene material in the classifier, putting the material into a high-pressure fluidized bed, continuously introducing high-temperature steam into the fluidized bed, continuously introducing the high-temperature steam at a super-high speed of 1000 m/second when the pressure of the materials in the fluidized bed is 1.0-1.3 MPa, keeping the pressure in a storage bin in the fluidized bed to operate at a high speed, and realizing stable operation, and (S4) putting the obtained polymerized and decomposed spherical material into a high-speed high-pressure shearing machine for secondary shearing treatment, putting the sheared material into a catalytic combustion device, making the material burn without flame under the condition of lower ignition temperature, and fully combusting to obtain a graphene plastic product with a particle size of 200 nm.