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(11)

EP 4 363 625 A1

(12)

(43) Date of publication: 08.05.2024 Bulletin 2024/19 (21) Application number: 22738408.8 (22) Date of filing: 23.06.2022

(51) International Patent Classification (IPC):  C22B 3/08(2006.01) C22B 3/22(2006.01) C22B 7/00(2006.01) C01F 17/00(2020.01) C22B 3/44(2006.01) C22B 59/00(2006.01) (52) Cooperative Patent Classification (CPC): C22B 59/00; C22B 3/44; C22B 7/007; C22B 3/08; C22B 3/22; C01F 11/46; C01F 11/181; C01F 17/282; Y02P 10/20 (86) International application number: PCT/EP2022/067186 (87) International publication number: WO 2023/274838 (05.01.2023 Gazette 2023/01)

(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 MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 30.06.2021 GB 202109481 (71) Applicant: G S A (Environmental) Limited Brigg DN20 8ES (GB)	(72) Inventor: MAKANYIRE, Terence LINCOLN, LN6 8JT (GB) (74) Representative: Loven, Keith James  LOVEN Patents & Trademarks Limited 51 Wragby Road Sudbrooke Lincoln, Lincolnshire LN2 2QU Lincoln, Lincolnshire LN2 2QU (GB)