▎ 摘　　要

NOVELTY - The method involves introducing GNP into a separation column (900), and increasing the content of the GNP with lower thickness by flow of a medium through the column. The resulting GNP with lower thickness is collected. The liquid is water, organic solvent or ionic liquid. The medium is gas including air, nitrogen, argon, helium, xenon, noble gas, vapor of liquid, or gaseous sulfur hexafluoride. The pressure of the gas is lower than atmospheric pressure. USE - Method for enrichment of mixture of graphene nanoplatelet (GNP). ADVANTAGE - The cost reduction is achieved. The thicker GNPs or graphite flakes are reprocessed, and the waste generation is reduced. The particle agglomeration is prevented, and the separation quality and yield are improved effectively. DETAILED DESCRIPTION - The method involves performing simultaneously electrostatic separation and separation by medium flow. The GNP is passed through an electrostatic field in a drift column to separate thinner GNP from thicker GNP to increase the content of thinner GNP. The GNP is supplied with a negative electric charge performed by providing contact with a negatively charged electrode. The GNP is passed through a plasma beam including corona discharge, or the GNP with an electron beam is irradiated. The raw material is exfoliated to create a percentage of separated GNP in resulting bulk mixture. The agglomerates are broken between the separated GNP in the bulk mixture, and the mixture is separated into fractions having different GNP content and size distribution. The medium flow control coupled to the column is performed to increase the content of the GNP with lower thickness by controlling the flow of medium through column. An INDEPENDENT CLAIM is included for a system for enrichment of mixture of GNP, has charging module that provides electrical charge to the GNP accepted by the column. An electrostatic field generator generates an electrostatic field in the draft column to increase the content of GNP with smaller thickness. An exfoliation module exfoliates the raw material to create percentage of separated GNP in a resulting bulk mixture. A graphene separation module separates graphene nanoplatelets from each different range of nanoparticles via a medium flow. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of system for performing electrostatic separation. Separation column (900) Positive electrode (901) Negative electrode (902) Wall (903) Nanoplatelets (906)