公开(公告)号：US20200270754A1

公开(公告)日：2020-08-27

申请号：US16756797

申请日：2018-12-20

Applicant: ArcelorMittal

Inventor： Andrea NAVES ARNALDOS ,  Elena PIEDRA FERNANDEZ ,  Vanesa MENENDEZ DELMIRO ,  Salome LOPEZ GONZALEZ

IPC: C23G1/08 ,  C23G1/36 ,  C23G3/02 ,  B01D61/14

Abstract: The invention relates to a method for pickling steel sheets 8, the steel sheets being continuously dipped in a pickling bath 1, containing a pickling solution 10, the bath being connected to a treatment unit including a recirculation tank 3, circulators 12 and 13, a continuous entering flow 11 of the solution being fed into an ultrafiltration device 2 from the recirculation tank 3 and two flows exiting the ultrafiltration device, one filtered exiting flow 21 being then fed back inside the recirculation tank 3 and one unfiltered flow 22, the treatment unit including no storage tank.

公开(公告)号：US20210188674A1

公开(公告)日：2021-06-24

申请号：US16757345

申请日：2018-12-13

Applicant: ARCELORMITTAL

Inventor： Patricia GOMEZ LEIVA ,  Vanesa MENENDEZ DELMIRO ,  Beatriz PADILLA VIVAS

IPC: C02F1/76 ,  C02F1/66

Abstract: A method for the treatment of wastewaters including a cyanide compound and a metallic compound, wherein the-wastewaters are subjected to a single oxidation step during which cyanides compounds are converted into carbon dioxide and nitrogen, this oxidation step including the mixing of 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 the pH of said mixture between 8.8 and 9.5 and the chlorine solution being added in such a quantity so as to maintain the oxydo-reduction potential of the mixture between 150 and 450 mV.