▎ 摘　　要

NOVELTY - A reduced graphene oxide from kish graphite is manufactured by (A) providing kish graphite; (B) pre-treating kish graphite by (i) sieving step where kish graphite has (a) a size of less than or equal to 50 mu m and (b) size of greater than or equal to 50 mu m where fraction (a) of kish graphite having a size of less than or equal to 50 mu m is removed, (ii) flotation step with fraction (b) and (iii) acid leaching step where an acid is added so that the ratio in weight of acid to kish graphite is 0.25-; (C) oxidizing pre-treated kish-graphite to obtain graphene oxide by (i) preparing mixture comprising pre-treated kish-graphite, acid and ammonium nitrate (NH4NO3) at less than or equal to 5 degrees C, (ii) adding oxidizing agent into the mixture, (iii) adding element to stope oxidation reaction after the targeted level of oxidation is reached, (iv) optionally, the separation of graphite oxide from mixture obtained in step (C.iii) and (v) exfoliating graphite oxide into graphene oxide; and (D) reducing graphene oxide into reduced graphene oxide. USE - Manufacture of reduced graphene oxide from kish graphite for deposition on a metallic substrate and as cooling agent (all claimed). Can be used in metal industries including steel, aluminum, stainless steel, copper, iron, copper alloys, titanium, cobalt, metal composite and nickel industries. ADVANTAGE - The method manufactures reduced graphene oxide with improved degree of crystallinity allowing for high thermal conductivity and high electrical conductivity, and good quality from high purity pre-treated Kish graphite, and is easy to implement at industrial scale and is less polluting. The method obtains reduced graphene oxide having good quality in the shortest time possible. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for reduced graphene oxide comprising less than or equal to 20 wt.% oxygen functional groups and having an average lateral size of less than or equal to 30 mu m and greater than or equal to 1 layer sheet. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the layer of reduced graphene oxide.