US 11,879,174 B2
Method for pickling steel sheets
Andrea Naves Arnaldos, Barcelona (ES); Elena Piedra Fernandez, Asturias (ES); Vanesa Menendez Delmiro, Asturias (ES); and Salome Lopez Gonzalez, Asturias (ES)
Assigned to ArcelorMittal, Luxembourg (LU)
Appl. No. 16/756,797
Filed by ArcelorMittal, Luxembourg (LU)
PCT Filed Dec. 20, 2018, PCT No. PCT/IB2018/060407
§ 371(c)(1), (2) Date Apr. 16, 2020,
PCT Pub. No. WO2019/123353, PCT Pub. Date Jun. 27, 2019.
Claims priority of application No. PCT/IB2017/058271 (WO), filed on Dec. 21, 2017.
Prior Publication US 2020/0270754 A1, Aug. 27, 2020
Int. Cl. C23G 1/08 (2006.01); B01D 61/14 (2006.01); C23G 1/36 (2006.01); C23G 3/02 (2006.01); C23G 1/02 (2006.01)
CPC C23G 1/08 (2013.01) [B01D 61/145 (2013.01); C23G 1/02 (2013.01); C23G 1/081 (2013.01); C23G 1/36 (2013.01); C23G 3/021 (2013.01); B01D 2311/04 (2013.01); B01D 2311/25 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for pickling steel sheets, the method comprising:
continuously dipping steel sheets in a pickling bath containing a pickling solution, the pickling bath being connected to a treatment unit including a recirculation tank, at least one circulator, a continuous entering flow of the pickling solution being fed into an ultrafiltration device from the recirculation tank and two flows exiting the ultrafiltration device, the two flows including one filtered exiting flow fed back into said recirculation tank and one unfiltered flow, the treatment unit including no storage tank.
 
15. An equipment comprising:
a pickling bath;
a transporter continuously dipping steel sheets in the pickling bath;
a treatment unit including a recirculation tank having an inlet and an outlet connected to the pickling bath, a further outlet of the recirculation tank connected to an inlet of an ultrafiltration device, a first outlet of the ultrafiltration device connected to a further inlet of the recirculation tank and a second outlet of the ultrafiltration device being provided for an unfiltered flow, the treatment unit including no storage tank.