Method for the manufacture of pristine graphene from kish graphite comprising: A. The provision of kish graphite, B. A pre-treatment of 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, iii. An acid leaching step wherein an acid is added so that the ratio in weight (acid amount)/(kish graphite amount) is between 0.25 and 1.0, iv. Optionally, the kish graphite is washed and dried, C. A synthesis step of pristine graphene from the kish-graphite comprising the following successive sub-steps: i. The intercalation of kish graphite with a nitrate salt and an acid to obtain intercalated kish graphite, the nitrate salt being chosen from: NaNO 3, NH 4 NO 3, KNO 3, Ni(NO 3) 2, Cu(NO 3) 2, Zn(NO 3) 2, Al(NO 3) 3 or a mixture thereof and the acid being chosen from: H 2 SO 4, HCI, HNO 3, H 3 PO 4, C 2 H 2 Cl 2 O 2 (dichloroacetic acid), HSO 2 OH (alkylsulfonic acid) or a mixture thereof, ii. The thermal expansion of the intercalated kish graphite at a temperature above 600°C during 1 min to 2 hours to obtain expanded kish graphite, iii. The exfoliation by ultra-sonication during at least 1 hour to obtain exfoliated kish graphite, iv. The separation of the unexfoliated kish graphite and the obtained pristine graphene. A. The provision of kish graphite, B. A pre-treatment of 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, iii. An acid leaching step wherein an acid is added so that the ratio in weight (acid amount)/(kish graphite amount) is between 0.25 and 1.0, iv. Optionally, the kish graphite is washed and dried, 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, 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, iii. An acid leaching step wherein an acid is added so that the ratio in weight (acid amount)/(kish graphite amount) is between 0.25 and 1.0, iv. Optionally, the kish graphite is washed and dried, C. A synthesis step of pristine graphene from the kish-graphite comprising the following successive sub-steps: i. The intercalation of kish graphite with a nitrate salt and an acid to obtain intercalated kish graphite, the nitrate salt being chosen from: NaNO 3, NH 4 NO 3, KNO 3, Ni(NO 3) 2, Cu(NO 3) 2, Zn(NO 3) 2, Al(NO 3) 3 or a mixture thereof and the acid being chosen from: H 2 SO 4, HCI, HNO 3, H 3 PO 4, C 2 H 2 Cl 2 O 2 (dichloroacetic acid), HSO 2 OH (alkylsulfonic acid) or a mixture thereof, ii. The thermal expansion of the intercalated kish graphite at a temperature above 600°C during 1 min to 2 hours to obtain expanded kish graphite, iii. The exfoliation by ultra-sonication during at least 1 hour to obtain exfoliated kish graphite, iv. The separation of the unexfoliated kish graphite and the obtained pristine graphene. i. The intercalation of kish graphite with a nitrate salt and an acid to obtain intercalated kish graphite, the nitrate salt being chosen from: NaNO 3, NH 4 NO 3, KNO 3, Ni(NO 3) 2, Cu(NO 3) 2, Zn(NO 3) 2, Al(NO 3) 3 or a mixture thereof and the acid being chosen from: H 2 SO 4, HCI, HNO 3, H 3 PO 4, C 2 H 2 Cl 2 O 2 (dichloroacetic acid), HSO 2 OH (alkylsulfonic acid) or a mixture thereof, ii. The thermal expansion of the intercalated kish graphite at a temperature above 600°C during 1 min to 2 hours to obtain expanded kish graphite, iii. The exfoliation by ultra-sonication during at least 1 hour to obtain exfoliated kish graphite, iv. The separation of the unexfoliated kish graphite and the obtained pristine graphene.