	US 11,702,341 B2
	Method for the manufacture of graphene oxide from Kish graphite
Thi Tan Vu, Oviedo (ES); Maria Cabanas Corrales, Oviedo (ES); and Abel Alvarez-Alvarez, Trubia-Oviedo Asturias (ES)
Assigned to ArcelorMittal, Luxembourg (LU)
Appl. No. 16/499,431
Filed by ArcelorMittal, Luxembourg (LU)
PCT Filed Mar. 26, 2018, PCT No. PCT/IB2018/052038 § 371(c)(1), (2) Date Sep. 30, 2019, PCT Pub. No. WO2018/178842, PCT Pub. Date Oct. 4, 2018.
Claims priority of application No. PCT/IB2017/000350 (WO), filed on Mar. 31, 2017.
Prior Publication US 2021/0094829 A1, Apr. 1, 2021
Int. Cl. C01B 32/198 (2017.01); C01B 32/23 (2017.01)

CPC C01B 32/198 (2017.08) [C01B 32/23 (2017.08); C01B 2204/04 (2013.01); C01P 2004/20 (2013.01)]

18 Claims

1. A method for the manufacture of graphene oxide from kish graphite comprising:

A. providing kish graphite;

B. pre-treating the 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 50 μm,

b) Kish graphite having a size greater than or equal to 50 μm,

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 50 μm;

iii. an acid leaching step wherein an acid is added so that a ratio in weight (acid amount)/(kish graphite amount) is between 0.25 and 1.0; and

iv. optionally, the kish graphite is washed and dried; and

C. an oxidation step of the pre-treated kish graphite obtained after step B) in order to obtain graphene oxide.