▎ 摘　　要

NOVELTY - Purification of ammonium metavanadate involves (S1) dissolving graphene in deionized water, ultrasonically dispersing to obtain graphene dispersion (A), dissolving magnesium chloride in deionized water to obtain magnesium chloride solution (B), adding solution (B) to dispersion (A), adding ethanol, stirring to obtain magnesium chloride graphene dispersion reducing agent, adding vinyl trimethoxy silane, stirring to modify to obtain modified magnesium chloride graphene dispersion reducing agent (C), (S2) mixing and ball-milling ammonium metavanadate and graphene, dissolving in hot water, adding alkali to adjust pH value to 8-9 to obtain ammonium metavanadate graphene solution (D), (S3) dripping agent (C) to solution (D), reacting for more than 30 minutes until no precipitation occurs, filtering, and (S4) adding ammonium metavanadate crystal for recrystallization to obtain ammonium metavanadate precipitate, solid-liquid separating, and drying to obtain ammonium metavanadate. USE - Purification of ammonium metavanadate used as intermediate product, chemical reagent, catalyst, drier and mordant for extracting vanadium for preparing vanadium pentoxide. ADVANTAGE - The method provides ammonium metavanadate with high purity of not less than 99.9%, stable quality and high production efficiency, and can improves the selective adsorption performance of the graphene.