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1. (WO2017178154) METHOD FOR ELECTROLYTICALLY PICKLING METAL STRIPS

Pub. No.:    WO/2017/178154    International Application No.:    PCT/EP2017/055412
Publication Date: Fri Oct 20 01:59:59 CEST 2017 International Filing Date: Thu Mar 09 00:59:59 CET 2017
IPC: C25F 7/02
C25F 1/06
Applicants: ANDRITZ AG
Inventors: STARCEVIC, Jovan
KRUPICKA, Ulrich
Title: METHOD FOR ELECTROLYTICALLY PICKLING METAL STRIPS
Abstract:
The invention relates to a method for electrolytically pickling metal strips (1), in particular stainless steel strips. In the pickling method (2), the metal strip (1) is descaled in a pickling solution (B) using an electric current, and the used pickling solution (6) enriched with metals is regenerated. The metals dissolved in the pickling acid (6) are separated from the regenerated pickling solution (B) as metal hydroxides (9). According to the invention, the metal hydroxides (9) are dissolved in acid (11) and the resulting metal-containing solution (14) undergoes a pyrohydrolytic treatment, preferably in a spray roasting reactor (15), in order to form metal oxides (16).