US 11,713,264 B2
Method for the treatment of wastewaters
Patricia Gomez Leiva, Aviles (ES); Vanesa Menendez Delmiro, Aviles (ES); and Beatriz Padilla Vivas, Aviles (ES)
Assigned to ArcelorMittal, Luxembourg (LU)
Appl. No. 16/757,345
Filed by ARCELORMITTAL, Luxembourg (LU)
PCT Filed Dec. 13, 2018, PCT No. PCT/IB2018/060006
§ 371(c)(1), (2) Date Apr. 17, 2020,
PCT Pub. No. WO2019/116297, PCT Pub. Date Jun. 20, 2019.
Claims priority of application No. PCT/IB2017/057927 (WO), filed on Dec. 14, 2017.
Prior Publication US 2021/0188674 A1, Jun. 24, 2021
Int. Cl. C02F 1/76 (2023.01); C02F 1/66 (2023.01); C02F 101/18 (2006.01); C02F 101/20 (2006.01); C02F 103/18 (2006.01)
CPC C02F 1/76 (2013.01) [C02F 1/66 (2013.01); C02F 2101/18 (2013.01); C02F 2101/20 (2013.01); C02F 2103/18 (2013.01); C02F 2209/04 (2013.01); C02F 2209/06 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method for the treatment of wastewaters including a cyanide compound and a metallic compound, the method comprising:
subjecting the wastewaters to a single oxidation step during which cyanides compounds are converted into carbon dioxide and nitrogen, the oxidation step including mixing of the wastewaters with a chlorine solution and an alkaline agent so as to obtain a mixture, the alkaline agent being added in such a quantity so as to maintain a pH of the mixture between 8.8 and 9.5 and the chlorine solution being added in such a quantity so as to maintain one value of an oxydo-reduction potential of the mixture while the cyanides compounds are converted into carbon dioxide and nitrogen, the one value being between 150 and 450 mV.