(19)

(11)

EP 4 573 236 A2

(12)

(88) Date of publication A3: 20.06.2024 (43) Date of publication: 25.06.2025 Bulletin 2025/26 (21) Application number: 23783431.2 (22) Date of filing: 04.10.2023

(51) International Patent Classification (IPC):  C25C 1/12(2006.01) (52) Cooperative Patent Classification (CPC): C25C 1/12; C25C 7/06; C22B 7/007; C22B 15/0071; C22B 23/043 (86) International application number: PCT/EP2023/077459 (87) International publication number: WO 2024/078938 (18.04.2024 Gazette 2024/16)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 14.10.2022 BE 202205827 (71) Applicant: Umicore 1000 Brussels (BE)	(72) Inventors: SCHUTYSER, Wouter 2250 Olen (BE) KLAASEN, Bart 2250 Olen (BE) LUYTEN, Jan 2250 Olen (BE) (74) Representative: Umicore RDI Patent Department  Watertorenstraat 33 2250 Olen 2250 Olen (BE)