▎ 摘　　要

NOVELTY - Preparing selective catalytic reduction (SCR) denitration catalyst comprises (1) dissolving neutralized slag by rare earth oxalic acid wastewater by sulfuric acid, depositing and converting, after completing precipitation conversion, adding concentrated sulfuric acid to make the mass concentration of sulfuric acid in the solution to 2.5-10 wt.%, then separating calcium sulfate precipitate and sulfuric acid rare earth solution, (2) adding saturated oxalic acid solution in graphene oxide solution with mass concentration of 0.1-20 wt.% to obtain mixed solution of graphene oxide and oxalic acid, (3) adding graphene oxide oxalic acid mixed solution into sulfuric acid rare earth solution, stirring, filtering, and cleaning to obtain precipitate, (4) dispersing precipitate into de-ionized water, adding excessive hydrazine hydrate, reducing graphene oxide into graphene, and reducing to obtain product, burning at 400-500 degrees C and maintaining for 2-4 hours to obtain the SCR denitration catalyst. USE - The method is useful for preparing selective catalytic reduction (SCR) denitration catalyst.