▎ 摘　　要

NOVELTY - Preparing graphene powder on a large scale involves adding graphite powder, oxidizer and strong acid are added to the hydrothermal kettle and mixed uniformly. The oxidative exfoliation reaction is carried out at a certain temperature to form graphene oxide, continued to heat the hydrothermal kettle that forms graphene oxide to the pre-reduction temperature to perform a hydrothermal pre-reduction reaction to form partially reduced graphene oxide. The pre-reduced reaction solution is filtered, the filtrate is recovered by sulfuric acid, and the filter residue is washed and dried to obtain partially reduced graphene oxide powder. The partially reduced graphene oxide powder is subjected to a reduction reaction under an inert atmosphere to obtain graphene. USE - Method for preparing graphene powder on a large scale. ADVANTAGE - The method enables to prepare graphene powder on a large scale is closed and has low requirements for temperature control. The product after the recovery of sulfuric acid can be directly filtered and washed quickly, which solves the problem of difficult to filter and wash graphene oxide, and improves the production efficiency of graphene.