Method for the manufacture of reduced graphene oxide from kish graphite comprising: A. The provision of kish graphite, B. A pre-treatment step of said kish graphite comprising the following successive sub-steps: i. A sieving step wherein the kish graphite is classified by size as follows: a) Kish graphite having a size below 50μm, b) Kish graphite having a size above or equal to 50μm, the fraction a) of kish graphite having a size below 50 μm being removed, ii. A flotation step with the fraction b) of kish graphite having a size above or equal to 50μm and iii. An acid leaching step wherein an acid, selected among the following elements: chloride acid, phosphoric acid, sulfuric acid, nitric acid or a mixture thereof, is added so that the ratio in weight (acid amount)/(kish graphite amount) is between 0.25 and 1.0, C. An oxidation step of the pre-treated kish-graphite obtained after step B) in order to obtain graphene oxide comprising the following successive sub-steps: i. The preparation of a mixture comprising the pre-treated kish-graphite, an acid and ammonium nitrate (NH 4 NO 3), the mixture being kept at a temperature below 5°C, the acid being selected among the following elements: chloride acid, phosphoric acid, sulfuric acid, nitric acid or a mixture thereof, ii. The addition of an oxidizing agent, chosen from: potassium permanganate, H 2 O 2, O 3, H 2 S 2 O 8, H 2 SO 5, KNO 3, NaClO or a mixture thereof, into the mixture obtained in step C.i), iii. After the targeted level of oxidation of at least 45% by weight of oxygen functional groups is reached, the addition of a chemical element to stop the oxidation reaction, the chemical element being chosen from: an acid, non-deionized water, deionized water, H 2 O 2 or a mixture thereof, iv. Optionally, the separation of graphite oxide from the mixture obtained in step C.iii) and v. The exfoliation of graphite oxide into graphene oxide and D. A reduction of graphene oxide into reduced graphene oxide. A. The provision of kish graphite, B. A pre-treatment step of said kish graphite comprising the following successive sub-steps: i. A sieving step wherein the kish graphite is classified by size as follows: a) Kish graphite having a size below 50μm, b) Kish graphite having a size above or equal to 50μm, the fraction a) of kish graphite having a size below 50 μm being removed, ii. A flotation step with the fraction b) of kish graphite having a size above or equal to 50μm and iii. An acid leaching step wherein an acid, selected among the following elements: chloride acid, phosphoric acid, sulfuric acid, nitric acid or a mixture thereof, is added so that the ratio in weight (acid amount)/(kish graphite amount) is between 0.25 and 1.0, i. A sieving step wherein the kish graphite is classified by size as follows: a) Kish graphite having a size below 50μm, b) Kish graphite having a size above or equal to 50μm, the fraction a) of kish graphite having a size below 50 μm being removed, a) Kish graphite having a size below 50μm, b) Kish graphite having a size above or equal to 50μm, ii. A flotation step with the fraction b) of kish graphite having a size above or equal to 50μm and iii. An acid leaching step wherein an acid, selected among the following elements: chloride acid, phosphoric acid, sulfuric acid, nitric acid or a mixture thereof, is added so that the ratio in weight (acid amount)/(kish graphite amount) is between 0.25 and 1.0, C. An oxidation step of the pre-treated kish-graphite obtained after step B) in order to obtain graphene oxide comprising the following successive sub-steps: i. The preparation of a mixture comprising the pre-treated kish-graphite, an acid and ammonium nitrate (NH 4 NO 3), the mixture being kept at a temperature below 5°C, the acid being selected among the following elements: chloride acid, phosphoric acid, sulfuric acid, nitric acid or a mixture thereof, ii. The addition of an oxidizing agent, chosen from: potassium permanganate, H 2 O 2, O 3, H 2 S 2 O 8, H 2 SO 5, KNO 3, NaClO or a mixture thereof, into the mixture obtained in step C.i), iii. After the targeted level of oxidation of at least 45% by weight of oxygen functional groups is reached, the addition of a chemical element to stop the oxidation reaction, the chemical element being chosen from: an acid, non-deionized water, deionized water, H 2 O 2 or a mixture thereof, iv. Optionally, the separation of graphite oxide from the mixture obtained in step C.iii) and v. The exfoliation of graphite oxide into graphene oxide and i. The preparation of a mixture comprising the pre-treated kish-graphite, an acid and ammonium nitrate (NH 4 NO 3), the mixture being kept at a temperature below 5°C, the acid being selected among the following elements: chloride acid, phosphoric acid, sulfuric acid, nitric acid or a mixture thereof, ii. The addition of an oxidizing agent, chosen from: potassium permanganate, H 2 O 2, O 3, H 2 S 2 O 8, H 2 SO 5, KNO 3, NaClO or a mixture thereof, into the mixture obtained in step C.i), iii. After the targeted level of oxidation of at least 45% by weight of oxygen functional groups is reached, the addition of a chemical element to stop the oxidation reaction, the chemical element being chosen from: an acid, non-deionized water, deionized water, H 2 O 2 or a mixture thereof, iv. Optionally, the separation of graphite oxide from the mixture obtained in step C.iii) and v. The exfoliation of graphite oxide into graphene oxide and D. A reduction of graphene oxide into reduced graphene oxide.