▎ 摘　　要

NOVELTY - Producing graphene dispersed solution, comprises (a) expanding expandable graphite, (b) quenching to cool the expandable graphite, (c) filtering the cooled expanded graphite, (d) grinding and dispersing the filtered powder, and (e) ultrasonically treating the obtained dispersion. USE - The method is useful for producing graphene dispersed solution (claimed). ADVANTAGE - The method produces high quality graphene in a rapid, simple and cost-efficient manner, and avoids the use of organic solvents and so is environmentally friendly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for producing graphene powder, comprising (a), (b), (c), (d), (e) and (f) drying the ultrasonically treated coarse dispersion liquid.